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Analysis of Energy Generation from Exhaust of Automobile using Peltier Thermo...ijtsrd
In recent past days, big deal of the automobile industry's RESEARCH and DEVELOPMENT Practicing on improving overall efficiency of vehicle. It has brought a major interest in the field of making internal combustion engines highly efficient 1 . In past days, only 25 30 energy is used in the vehicle and rest is exposed to surroundings. The useful energy is used to run the engine as well as generator. So the efficiency of those engine were very less. But the efficiency can be improved by utilizing waste heat that is exhaust of vehicle. One of the best technology that was found to be useful for this purpose were thermoelectric generator. In this, we study and investigated the use of thermoelectric generator for power production 2 . Thermoelectric generator works by imparting exhaust's gas stream on its surface and small D.C. electric current developed due to difference in temperature across heat exchanger that is put in the pathway of exhaust gas i.e. working on seebeck effect principle. An output Voltage of 200mV was generated using a single Bi2Te3 thermoelectric module for a temperature difference of about 40o C which can be used in charging battery, headlight, G.P.S. systems, etc. Such that it can reduce the level of alternator's frictional power that is used to save fuel and also in automotive industry to increase the efficiency of engine 1 . Naveen Kumar | Vaibhav Setia | Sunil Kumar Patel | Satyam Upadhyay, | Saurabh Chauhan, | Prakhar Bajpai ""Analysis of Energy Generation from Exhaust of Automobile using Peltier (Thermoelectric Generator)"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd22986.pdf
Paper URL: https://www.ijtsrd.com/engineering/transport-engineering/22986/analysis-of-energy-generation-from-exhaust-of-automobile-using-peltier-thermoelectric-generator/naveen-kumar
Waste heat recovery, co geration and tri-generationAmol Kokare
Diploma in Mechanical Engg.
Babasaheb Phadtare Polytechnic, kalamb-walchandnagar
Sub- Power plant engineering
Unit-Waste heat recovery, co geration and tri-generation.
By- Prof. Kokare Amol Yashwant
Analysis of Energy Generation from Exhaust of Automobile using Peltier Thermo...ijtsrd
In recent past days, big deal of the automobile industry's RESEARCH and DEVELOPMENT Practicing on improving overall efficiency of vehicle. It has brought a major interest in the field of making internal combustion engines highly efficient 1 . In past days, only 25 30 energy is used in the vehicle and rest is exposed to surroundings. The useful energy is used to run the engine as well as generator. So the efficiency of those engine were very less. But the efficiency can be improved by utilizing waste heat that is exhaust of vehicle. One of the best technology that was found to be useful for this purpose were thermoelectric generator. In this, we study and investigated the use of thermoelectric generator for power production 2 . Thermoelectric generator works by imparting exhaust's gas stream on its surface and small D.C. electric current developed due to difference in temperature across heat exchanger that is put in the pathway of exhaust gas i.e. working on seebeck effect principle. An output Voltage of 200mV was generated using a single Bi2Te3 thermoelectric module for a temperature difference of about 40o C which can be used in charging battery, headlight, G.P.S. systems, etc. Such that it can reduce the level of alternator's frictional power that is used to save fuel and also in automotive industry to increase the efficiency of engine 1 . Naveen Kumar | Vaibhav Setia | Sunil Kumar Patel | Satyam Upadhyay, | Saurabh Chauhan, | Prakhar Bajpai ""Analysis of Energy Generation from Exhaust of Automobile using Peltier (Thermoelectric Generator)"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd22986.pdf
Paper URL: https://www.ijtsrd.com/engineering/transport-engineering/22986/analysis-of-energy-generation-from-exhaust-of-automobile-using-peltier-thermoelectric-generator/naveen-kumar
Waste heat recovery, co geration and tri-generationAmol Kokare
Diploma in Mechanical Engg.
Babasaheb Phadtare Polytechnic, kalamb-walchandnagar
Sub- Power plant engineering
Unit-Waste heat recovery, co geration and tri-generation.
By- Prof. Kokare Amol Yashwant
Modeling, Application and Economic Feasibility Analysis of SOFC Combined Heat...juliomussane
Abstract- Abstract: Solid fuel cells combined heat and power is one of the most promising technologies for reducing energy consumption in stationary area (commercial building and residential environmental). This paper is aim to studies the model, applications and economic feasibility of an model of Solid Oxide Fuel Cell micro combined Heat and Power (SOFC mCHP) for single-family apartment in Wuhan area. A model of Solid Oxide Fuel Cell micro combined Heat and Power (SOFC mCHP) system is presented to estimate the energy required to meet the average of electricity and heating demand of a 120 m2 of single-family apartment in Wuhan area. Several simulation are conducted in Matlab-Simulink® environment in order to archive the aim of this paper. The model can be modified for any SOFC micro-CHP system. SOFC micro-CHP for stationary area has a higher potential to becoming cost-competitive in the worldwide. Based on the economic feasibility analyzes presented, the results indicated that it is feasible to introduce the SOFC micro-CHP system in Wuhan area from the economic viewpoint. However, fuel cell are still a non-mature technology aiming to reach the market in the coming years. Due to the constant development of fuel cell technology and recent commercial production, the available information about its performance in real applications is currently limited to date, and the cost information is not well established.
Index Terms- Model, application, economic analyze, SOFC, co-generation Heat and Power, Wuhan area.
To Improve Thermal Efficiency of 27mw Coal Fired Power PlantIJMER
Booming demand for electricity, especially in the developing countries, has raised power generation technologies in the headlines. At the same time the discussion about causes of global warming has focused on emissions originating from power generation and on CO2 reduction technologies such as:
(1) Alternative primary energy sources,
(2) Capture and storage of CO2,
(3) Increasing the efficiency of converting primary energy content into electricity.
In the dissertation, the thermal efficiency of the power plant is improved when Control of furnace draft (nearer to balanced draft). Oxygen level decreases percentage of flue gases. Above this level heat losses are increases & below this carbon mono-oxide is formed. Steam power plant is using fuel to generate electrical power. The used of the fuel must be efficient so the boiler can generate for the maximum electrical power. By the time the steam cycle in the boiler, it also had heat losses through some parts and it effect on the efficiency of the boiler. This project will analyze about the parts of losses and boiler efficiency. to find excess air which effect heat losses in boiler. By using the 27 MW coal fired thermal power plant of Birla Corporation Limited, Satna (M.P.) the data is collect by using types of Combustion & heat flow in boiler. Result of the analysis show that the efficiency of boiler depends on mass of coal burnt & type of combustion .This study is fulfilling the objective of analysis to find the boiler efficiency and heat losses in boiler for 27 MW thermal power plant of Birla Corporation Limited, Satna (M.P.)
Power plant engineering unit 2 notes by Varun Pratap SinghVarun Pratap Singh
Download Link: https://sites.google.com/view/varunpratapsingh/teaching-engagements (Copy URL)
SYLLABUS
Unit-II
Steam power plant
Power plant boilers including critical and super critical boilers. Fluidized bed boilers, boilers
mountings and accessories.
General layout of steam power plant. Different systems such as fuel handling system,
pulverizes and coal burners, combustion system, draft, ash handling system, feed water
treatment and condenser and cooling system, turbine auxiliary systems such as governing, feed
heating, reheating, flange heating and gland leakage.
Operation and maintenance of steam power plant, heat balance and efficiency.
Download Link (Copy URL):
https://sites.google.com/view/varunpratapsingh/teaching-engagements
Syllabus:
Introduction
Need of Cogeneration
Principle and Advantages of Cogeneration
Technical Options for Cogeneration
Gas turbine Cogeneration Systems
Reciprocating Engine Cogeneration Systems
Classification of Cogeneration Systems
Topping Cycle
Bottoming Cycle
Factors Influencing Cogeneration Choice
Important Technical Parameters for Cogeneration
Typical Cogeneration Performance Parameters
Relative Merits of Cogeneration Systems
Case Study
Now a day’s power generation is most important for
every country. This power is generated by some thermal
cycles. But single cycle cannot be attain complete power
requirements and its efficiency also very low so that to fulfill
this requirements to combine two or more cycles in a single
power plant then we can increase the efficiency of the power
plant. Its increased efficiency is more than that of if the plant
operated on single cycle. In which we are using two different
cycles and these two cycles are operated by means of different
working mediums. These type of power plants we can called
them like combined cycle power plants. In combined cycle
power plants above cycle is known as topping cycle and below
cycle is known as bottoming cycle. The above cycle generally
brayton cycle which uses air as a working medium. When the
power generation was completed the exhaust gas will passes
in to the waste heat recovery boiler. Another cycle also
involved in bottoming cycle. This cycle works on the basis on
rankine cycle. In which steam is used as working medium.
The main component in bottoming cycle is waste heat
recovery boiler. It will receive exhaust heat from the gas
turbine and converts water in to steam. The steam used for
generating power by expansion on steam turbine. Combined
cycle power plants are mostly used in commercial power
plants.
In this paper we are analyzing one practical
combined cycle power plant. In practical conditions due to
some losses it can not be generates complete power. So that
we are invistigated why it is not give that much of power and
the effect of various operating parameters such as maximum
temperature and pressure of rankine cycle, gas turbine inlet
temperature and pressure ratio of Brayton cycle on the net
output work and thermal efficiency of the combine cycle
power plant.
The outcome of this work can be utilized in order to
facilitate the design of a combined cycle with higher efficiency
and output work. Mathematical calculations and simple
graphs in ms excel, and auto cad has been carried out to
study the effects and influences of the above mentioned
parameters on the efficiency and work output.
Power plant engineering unit 3 notes by Varun Pratap SinghVarun Pratap Singh
Download Link: https://sites.google.com/view/varunpratapsingh/teaching-engagements (Copy URL)
Unit-3
Diesel power plant
General layout, performance of diesel engine, fuel system, lubrication system, air intake and admission system, supercharging system, exhaust system, diesel plant operation and efficiency, heat balance.
Gas turbine power plant
Elements of gas turbine power plants, Gas turbine fuels, cogeneration, auxiliary systems such as fuel, controls and lubrication, operation and maintenance, Combined cycle power plants.
Combined Efficiency Calculation of Bismuth Telluride and Lead Telluride in Th...IJMERJOURNAL
Abstract:- The heat rejected from an internal combustion engine is dumped into the atmosphere as waste heat. If this waste heat energy is tapped and converted into usable energy, the overall efficiency of an engine can be improved. The percentage of energy rejected to the environment through exhaust gas is approximately 30-40%.The thermoelectric generators are used for power generation . Thermoelectric modules which are used in thermoelectric generators are solid state devices that are used to convert thermal energy from a temperature gradient to electrical energy and it works on basic principle of Seebeck effect. The objective of this project is to include fin effect to increase cooling rate , to reduce the temperature by increasing the temperature difference and to use long fin and avoid accumulation of heat in between fins . The TEG system is directly connected to the exhaust pipe and the amount of electricity generated by the thermoelectric material is directly proportional to their heated area . The materials used in TEG are Bi2Te3 - Bismuth Telluride and PbTe - Lead Telluride . Bi2Te3 module TEG is highly efficient in room temperature , but heat withstanding capacity of Bi2Te3 is less than PbTe.The combination of these thermoelectric materials are used for better efficiency . The testing is done for above conditions and experimental results with this setup are performed and presented.
Novel technique for maximizing the thermal efficiency of a hybrid pveSAT Journals
Abstract In this paper a comparison between numerical model and experimental work results for a fixed Photovoltaic/ Thermal (PV/T) hybrid system is presented. The simulation in this work is based on a numerical model in solving the equations and determining the Photovoltaic (PV) cells thermal characteristics using both MATLAB and COMSOL Multiphysics. COMSOL is simulating the electromagnetic waves produced by the Sun through solving Maxwell's equations in three dimensions using Finite Elements Methods (FEM) and the sun irradiance is assumed to be Gaussian distribution across the twelve mourning hours. Beside that an experimental work is presented depending on the results conjured from the theoretical experience used in Comsol Multiphysics. A Pulse Width Modulator (PWM) is used to control the solenoid valve operation. In addition to the above a thermal analysis for the fixed PV modules and the piping water is presented where the output water temperatures, rate of heat transfer, overall heat transfer coefficient and thermal efficiency are calculated. As a result, a significant enhancement in the total thermal efficiency is observed with acceptable increase in the output water temperature. Keywords: Cooling systems; DAQ; Hybrid; COMSOL MULTIPHYSICS; MATLAB; Solid work; Lab view.
In the current work, a thermoelectric power generation system was designed for an assessment of opportunities in terms of electricity production through the utilization of waste heat from sugarcane industries. In this study, the thermoelectric cooling of TEC1-12708T200 was appropriate for use in electric power generation from low-grade heat sources. The experiments used ten thermoelectric modules and an aluminum water block installed on the exterior surface area of a sugar boiler to achieve the same water flow as a traditional system. The results revealed that the power generation system could generate about 30 W (25.7 V, 1.17 A) at a matched load of approximately 36.8 Ω. The thermoelectric power generation system could convert 12.5% of heat energy into electrical energy. Therefore, the thermoelectric power generation system designed in this study could be an effective alternative for waste heat recovery in sugarcane industries.
OPTIMISATION OF BINARY COGENERATIVE THERMAL POWER PLANTS WITH SOLID OXIDE FUE...IAEME Publication
The present paper deals with the issue of large capacity binary co-generative thermal power plants with high temperature solid oxide fuel cells (SOFC) on natural gas.A complex function with a number of variables is employed in order to optimize the operation cycle of this type of power plant from the energy and environmental standpoint.
Use of Process Analyzers in Fossil Fuel PlantsIves Equipment
In spite of all efforts concerning energy savings and efficiency, the growing world population and the aspired higher 'standard of living' will lead to a further in- crease of world energy demand. In this context, almost half of the primary energy demand will continue to be covered by solid fuels, particularly by coal, until 2020 and many years beyond.
Modeling, Application and Economic Feasibility Analysis of SOFC Combined Heat...juliomussane
Abstract- Abstract: Solid fuel cells combined heat and power is one of the most promising technologies for reducing energy consumption in stationary area (commercial building and residential environmental). This paper is aim to studies the model, applications and economic feasibility of an model of Solid Oxide Fuel Cell micro combined Heat and Power (SOFC mCHP) for single-family apartment in Wuhan area. A model of Solid Oxide Fuel Cell micro combined Heat and Power (SOFC mCHP) system is presented to estimate the energy required to meet the average of electricity and heating demand of a 120 m2 of single-family apartment in Wuhan area. Several simulation are conducted in Matlab-Simulink® environment in order to archive the aim of this paper. The model can be modified for any SOFC micro-CHP system. SOFC micro-CHP for stationary area has a higher potential to becoming cost-competitive in the worldwide. Based on the economic feasibility analyzes presented, the results indicated that it is feasible to introduce the SOFC micro-CHP system in Wuhan area from the economic viewpoint. However, fuel cell are still a non-mature technology aiming to reach the market in the coming years. Due to the constant development of fuel cell technology and recent commercial production, the available information about its performance in real applications is currently limited to date, and the cost information is not well established.
Index Terms- Model, application, economic analyze, SOFC, co-generation Heat and Power, Wuhan area.
To Improve Thermal Efficiency of 27mw Coal Fired Power PlantIJMER
Booming demand for electricity, especially in the developing countries, has raised power generation technologies in the headlines. At the same time the discussion about causes of global warming has focused on emissions originating from power generation and on CO2 reduction technologies such as:
(1) Alternative primary energy sources,
(2) Capture and storage of CO2,
(3) Increasing the efficiency of converting primary energy content into electricity.
In the dissertation, the thermal efficiency of the power plant is improved when Control of furnace draft (nearer to balanced draft). Oxygen level decreases percentage of flue gases. Above this level heat losses are increases & below this carbon mono-oxide is formed. Steam power plant is using fuel to generate electrical power. The used of the fuel must be efficient so the boiler can generate for the maximum electrical power. By the time the steam cycle in the boiler, it also had heat losses through some parts and it effect on the efficiency of the boiler. This project will analyze about the parts of losses and boiler efficiency. to find excess air which effect heat losses in boiler. By using the 27 MW coal fired thermal power plant of Birla Corporation Limited, Satna (M.P.) the data is collect by using types of Combustion & heat flow in boiler. Result of the analysis show that the efficiency of boiler depends on mass of coal burnt & type of combustion .This study is fulfilling the objective of analysis to find the boiler efficiency and heat losses in boiler for 27 MW thermal power plant of Birla Corporation Limited, Satna (M.P.)
Power plant engineering unit 2 notes by Varun Pratap SinghVarun Pratap Singh
Download Link: https://sites.google.com/view/varunpratapsingh/teaching-engagements (Copy URL)
SYLLABUS
Unit-II
Steam power plant
Power plant boilers including critical and super critical boilers. Fluidized bed boilers, boilers
mountings and accessories.
General layout of steam power plant. Different systems such as fuel handling system,
pulverizes and coal burners, combustion system, draft, ash handling system, feed water
treatment and condenser and cooling system, turbine auxiliary systems such as governing, feed
heating, reheating, flange heating and gland leakage.
Operation and maintenance of steam power plant, heat balance and efficiency.
Download Link (Copy URL):
https://sites.google.com/view/varunpratapsingh/teaching-engagements
Syllabus:
Introduction
Need of Cogeneration
Principle and Advantages of Cogeneration
Technical Options for Cogeneration
Gas turbine Cogeneration Systems
Reciprocating Engine Cogeneration Systems
Classification of Cogeneration Systems
Topping Cycle
Bottoming Cycle
Factors Influencing Cogeneration Choice
Important Technical Parameters for Cogeneration
Typical Cogeneration Performance Parameters
Relative Merits of Cogeneration Systems
Case Study
Now a day’s power generation is most important for
every country. This power is generated by some thermal
cycles. But single cycle cannot be attain complete power
requirements and its efficiency also very low so that to fulfill
this requirements to combine two or more cycles in a single
power plant then we can increase the efficiency of the power
plant. Its increased efficiency is more than that of if the plant
operated on single cycle. In which we are using two different
cycles and these two cycles are operated by means of different
working mediums. These type of power plants we can called
them like combined cycle power plants. In combined cycle
power plants above cycle is known as topping cycle and below
cycle is known as bottoming cycle. The above cycle generally
brayton cycle which uses air as a working medium. When the
power generation was completed the exhaust gas will passes
in to the waste heat recovery boiler. Another cycle also
involved in bottoming cycle. This cycle works on the basis on
rankine cycle. In which steam is used as working medium.
The main component in bottoming cycle is waste heat
recovery boiler. It will receive exhaust heat from the gas
turbine and converts water in to steam. The steam used for
generating power by expansion on steam turbine. Combined
cycle power plants are mostly used in commercial power
plants.
In this paper we are analyzing one practical
combined cycle power plant. In practical conditions due to
some losses it can not be generates complete power. So that
we are invistigated why it is not give that much of power and
the effect of various operating parameters such as maximum
temperature and pressure of rankine cycle, gas turbine inlet
temperature and pressure ratio of Brayton cycle on the net
output work and thermal efficiency of the combine cycle
power plant.
The outcome of this work can be utilized in order to
facilitate the design of a combined cycle with higher efficiency
and output work. Mathematical calculations and simple
graphs in ms excel, and auto cad has been carried out to
study the effects and influences of the above mentioned
parameters on the efficiency and work output.
Power plant engineering unit 3 notes by Varun Pratap SinghVarun Pratap Singh
Download Link: https://sites.google.com/view/varunpratapsingh/teaching-engagements (Copy URL)
Unit-3
Diesel power plant
General layout, performance of diesel engine, fuel system, lubrication system, air intake and admission system, supercharging system, exhaust system, diesel plant operation and efficiency, heat balance.
Gas turbine power plant
Elements of gas turbine power plants, Gas turbine fuels, cogeneration, auxiliary systems such as fuel, controls and lubrication, operation and maintenance, Combined cycle power plants.
Combined Efficiency Calculation of Bismuth Telluride and Lead Telluride in Th...IJMERJOURNAL
Abstract:- The heat rejected from an internal combustion engine is dumped into the atmosphere as waste heat. If this waste heat energy is tapped and converted into usable energy, the overall efficiency of an engine can be improved. The percentage of energy rejected to the environment through exhaust gas is approximately 30-40%.The thermoelectric generators are used for power generation . Thermoelectric modules which are used in thermoelectric generators are solid state devices that are used to convert thermal energy from a temperature gradient to electrical energy and it works on basic principle of Seebeck effect. The objective of this project is to include fin effect to increase cooling rate , to reduce the temperature by increasing the temperature difference and to use long fin and avoid accumulation of heat in between fins . The TEG system is directly connected to the exhaust pipe and the amount of electricity generated by the thermoelectric material is directly proportional to their heated area . The materials used in TEG are Bi2Te3 - Bismuth Telluride and PbTe - Lead Telluride . Bi2Te3 module TEG is highly efficient in room temperature , but heat withstanding capacity of Bi2Te3 is less than PbTe.The combination of these thermoelectric materials are used for better efficiency . The testing is done for above conditions and experimental results with this setup are performed and presented.
Novel technique for maximizing the thermal efficiency of a hybrid pveSAT Journals
Abstract In this paper a comparison between numerical model and experimental work results for a fixed Photovoltaic/ Thermal (PV/T) hybrid system is presented. The simulation in this work is based on a numerical model in solving the equations and determining the Photovoltaic (PV) cells thermal characteristics using both MATLAB and COMSOL Multiphysics. COMSOL is simulating the electromagnetic waves produced by the Sun through solving Maxwell's equations in three dimensions using Finite Elements Methods (FEM) and the sun irradiance is assumed to be Gaussian distribution across the twelve mourning hours. Beside that an experimental work is presented depending on the results conjured from the theoretical experience used in Comsol Multiphysics. A Pulse Width Modulator (PWM) is used to control the solenoid valve operation. In addition to the above a thermal analysis for the fixed PV modules and the piping water is presented where the output water temperatures, rate of heat transfer, overall heat transfer coefficient and thermal efficiency are calculated. As a result, a significant enhancement in the total thermal efficiency is observed with acceptable increase in the output water temperature. Keywords: Cooling systems; DAQ; Hybrid; COMSOL MULTIPHYSICS; MATLAB; Solid work; Lab view.
In the current work, a thermoelectric power generation system was designed for an assessment of opportunities in terms of electricity production through the utilization of waste heat from sugarcane industries. In this study, the thermoelectric cooling of TEC1-12708T200 was appropriate for use in electric power generation from low-grade heat sources. The experiments used ten thermoelectric modules and an aluminum water block installed on the exterior surface area of a sugar boiler to achieve the same water flow as a traditional system. The results revealed that the power generation system could generate about 30 W (25.7 V, 1.17 A) at a matched load of approximately 36.8 Ω. The thermoelectric power generation system could convert 12.5% of heat energy into electrical energy. Therefore, the thermoelectric power generation system designed in this study could be an effective alternative for waste heat recovery in sugarcane industries.
OPTIMISATION OF BINARY COGENERATIVE THERMAL POWER PLANTS WITH SOLID OXIDE FUE...IAEME Publication
The present paper deals with the issue of large capacity binary co-generative thermal power plants with high temperature solid oxide fuel cells (SOFC) on natural gas.A complex function with a number of variables is employed in order to optimize the operation cycle of this type of power plant from the energy and environmental standpoint.
Use of Process Analyzers in Fossil Fuel PlantsIves Equipment
In spite of all efforts concerning energy savings and efficiency, the growing world population and the aspired higher 'standard of living' will lead to a further in- crease of world energy demand. In this context, almost half of the primary energy demand will continue to be covered by solid fuels, particularly by coal, until 2020 and many years beyond.
OPTIMIZATION OF A TURBINE USED IN COAL FIRED THERMAL POWER PLANTS BASED ON IN...ijmech
The purpose of current study is to analyze the effect of inlet steam temperature coming from the boiler on
thermoeconomic performance of a steam turbine used in a coal fired thermal power plant. Second law of
thermodynamics is used to develop the thermoeconomic model for the turbine. Analyses based on exergetic
and exergoeconomic criteria are done for the turbine used in a 210 MW power plant. Methodology is
explained with the help of an example. Effect of inlet steam temperature on the exergetic efficiency of the
turbine, unit product cost of turbine and unit product boiler has been shown. Optimization has been done
for the turbine as a trade off between the unit product cost of inlet steam from the boiler and unit product
cost of the turbine.
Technical and market evaluation of thermal generation power plants in the Col...IJECEIAES
Thermal power plants are the widely conventional generation unit technology used to produce electricity being controllable and dispatchable. The location of thermal power plants depends on the energy availability conditions of the areas and the capacity to fuels access. Their location and geographical distribution define a high level of concentration in areas defined as thermal districts and its location define reliability, security, availability, and flexibility indices to avoid critical scenario or support system from contingencies. However, in many cases the electrical configuration does not correspond to requirements. This paper links the concentration by political distribution in Colombia and the configuration used in the generating substations to guarantee requirements. The Hirschman-Herfindahl index as a market tool is used to evaluate energy concentration facing representative participation in certain departments of Colombia. Results evidenced configurations and concentration in a study case, results and analysis could be used for planner to promote participation, reliability and promote. The paper’s contribution and conclusions are linked to guide planners towards market and technical tool to evaluate installed capacities, avoid market concentration, and reduce risky scenarios.
IRJET-Detailed Energy Audit in a Captive Cogeneration PlantIRJET Journal
D.Rajani Kant , B.Sudheer Prem Kumar, N.Ravi Kumar, R.Virendra,J.Suresh Babu " Detailed Energy Audit in a Captive Cogeneration Plant ", International Research Journal of Engineering and Technology (IRJET), Volume2,issue-01 April 2015.e-ISSN:2395-0056, p-ISSN:2395-0072. www.irjet.net
Abstract
The rate of exploitation of the energy resources has been expanding over time and resulted in reduction of fossil fuel reserves. Efficiency of all resources is crucial both in environmental and economic sense. Using energy inefficiently creates waste in all the world’s economies. It has environmental impacts with regional, local and global implications.The key object is to adopt energy management in every field in order to reduce the wastage of energy sources and cost effectiveness without affecting productivity and growth.
The increasingly worldwide problem regarding rapid economy development and a relative shortage of
energy. Out of the total heat supplied to the engine in the form of fuel, approximately, 30 to 40% is converted
into useful mechanical work. With the rapid changing environment and atmospheric effect, the air conditioning
of the moving vehicle has become a necessity. In the same time consumers are incapable to bear the increasing
operating cost of the vehicles due to continuous raise in fuel prices, component costs and maintenance costs
associated with vehicles. Keep in mind in this paper, an exploration has been done to research the possibility of
waste heat recovery and its subsequent utilization in air conditioning system of a vehicle without increasing the
component cost, weight, number of component and bring improvement in vehicle by making luxurious. In this
system the Shell and Tube HE type will be used, designed and developed along with vapour absorption
refrigeration system and is tested for performance.
Keywords — Eefficiency, Exhaust Gas, Waste Heat & Shell Tube HE.
OPTIMIZATION OF AN OPEN CYCLE GAS TURBINE POWER PLANT USING EXERGOECONOMICSijmech
The purpose of current study is to analyze the performance of an open cycle gas turbine power plant using
the concepts of exergoeconomics. Exergoeconomic technique involves the use of Second law of
thermodynamics and assigns monetary values to the thermodynamic quantity known as exergy. Analyses
based on exergoeconomic criteria are done for the open cycle gas turbine power plant turbine. The
methodology is illustrated using the example of a 25 MW open cycle gas turbine power plant. Optimization
has been done for the open cycle gas turbine power plant as tradeoffs between the unit product cost of the
compressor and combustion chamber as functions of compressor pressure ratio and unit product costs of
combustion chamber and gas turbine as functions of turbine inlet temperature.
An Optimization Model for A Proposed Trigeneration System IJERA Editor
The combined cooling, heating, and power (CCHP) systems play an important role in the reduction of carbon emissions and the increase of energy efficiency for businesses and social organizations. Because of its potentials, tri-generation system has become a preference during the last decade. In this paper a hybrid trigeneration system is proposed for a university campus. The system is also important because it uses renewable energy sources as well as non-renewable energy sources. The objective of this paper is to propose an optimization model for this new Tri-generation system
GENERATION OF POWER THROUGH HYDROGEN – OXYGEN FUEL CELLSinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
A Novel Method for Prevention of Bandwidth Distributed Denial of Service AttacksIJERD Editor
Distributed Denial of Service (DDoS) Attacks became a massive threat to the Internet. Traditional
Architecture of internet is vulnerable to the attacks like DDoS. Attacker primarily acquire his army of Zombies,
then that army will be instructed by the Attacker that when to start an attack and on whom the attack should be
done. In this paper, different techniques which are used to perform DDoS Attacks, Tools that were used to
perform Attacks and Countermeasures in order to detect the attackers and eliminate the Bandwidth Distributed
Denial of Service attacks (B-DDoS) are reviewed. DDoS Attacks were done by using various Flooding
techniques which are used in DDoS attack.
The main purpose of this paper is to design an architecture which can reduce the Bandwidth
Distributed Denial of service Attack and make the victim site or server available for the normal users by
eliminating the zombie machines. Our Primary focus of this paper is to dispute how normal machines are
turning into zombies (Bots), how attack is been initiated, DDoS attack procedure and how an organization can
save their server from being a DDoS victim. In order to present this we implemented a simulated environment
with Cisco switches, Routers, Firewall, some virtual machines and some Attack tools to display a real DDoS
attack. By using Time scheduling, Resource Limiting, System log, Access Control List and some Modular
policy Framework we stopped the attack and identified the Attacker (Bot) machines
Hearing loss is one of the most common human impairments. It is estimated that by year 2015 more
than 700 million people will suffer mild deafness. Most can be helped by hearing aid devices depending on the
severity of their hearing loss. This paper describes the implementation and characterization details of a dual
channel transmitter front end (TFE) for digital hearing aid (DHA) applications that use novel micro
electromechanical- systems (MEMS) audio transducers and ultra-low power-scalable analog-to-digital
converters (ADCs), which enable a very-low form factor, energy-efficient implementation for next-generation
DHA. The contribution of the design is the implementation of the dual channel MEMS microphones and powerscalable
ADC system.
Influence of tensile behaviour of slab on the structural Behaviour of shear c...IJERD Editor
-A composite beam is composed of a steel beam and a slab connected by means of shear connectors
like studs installed on the top flange of the steel beam to form a structure behaving monolithically. This study
analyzes the effects of the tensile behavior of the slab on the structural behavior of the shear connection like slip
stiffness and maximum shear force in composite beams subjected to hogging moment. The results show that the
shear studs located in the crack-concentration zones due to large hogging moments sustain significantly smaller
shear force and slip stiffness than the other zones. Moreover, the reduction of the slip stiffness in the shear
connection appears also to be closely related to the change in the tensile strain of rebar according to the increase
of the load. Further experimental and analytical studies shall be conducted considering variables such as the
reinforcement ratio and the arrangement of shear connectors to achieve efficient design of the shear connection
in composite beams subjected to hogging moment.
Gold prospecting using Remote Sensing ‘A case study of Sudan’IJERD Editor
Gold has been extracted from northeast Africa for more than 5000 years, and this may be the first
place where the metal was extracted. The Arabian-Nubian Shield (ANS) is an exposure of Precambrian
crystalline rocks on the flanks of the Red Sea. The crystalline rocks are mostly Neoproterozoic in age. ANS
includes the nations of Israel, Jordan. Egypt, Saudi Arabia, Sudan, Eritrea, Ethiopia, Yemen, and Somalia.
Arabian Nubian Shield Consists of juvenile continental crest that formed between 900 550 Ma, when intra
oceanic arc welded together along ophiolite decorated arc. Primary Au mineralization probably developed in
association with the growth of intra oceanic arc and evolution of back arc. Multiple episodes of deformation
have obscured the primary metallogenic setting, but at least some of the deposits preserve evidence that they
originate as sea floor massive sulphide deposits.
The Red Sea Hills Region is a vast span of rugged, harsh and inhospitable sector of the Earth with
inimical moon-like terrain, nevertheless since ancient times it is famed to be an abode of gold and was a major
source of wealth for the Pharaohs of ancient Egypt. The Pharaohs old workings have been periodically
rediscovered through time. Recent endeavours by the Geological Research Authority of Sudan led to the
discovery of a score of occurrences with gold and massive sulphide mineralizations. In the nineties of the
previous century the Geological Research Authority of Sudan (GRAS) in cooperation with BRGM utilized
satellite data of Landsat TM using spectral ratio technique to map possible mineralized zones in the Red Sea
Hills of Sudan. The outcome of the study mapped a gossan type gold mineralization. Band ratio technique was
applied to Arbaat area and a signature of alteration zone was detected. The alteration zones are commonly
associated with mineralization. The alteration zones are commonly associated with mineralization. A filed check
confirmed the existence of stock work of gold bearing quartz in the alteration zone. Another type of gold
mineralization that was discovered using remote sensing is the gold associated with metachert in the Atmur
Desert.
Reducing Corrosion Rate by Welding DesignIJERD Editor
The paper addresses the importance of welding design to prevent corrosion at steel. Welding is
used to join pipe, profiles at bridges, spindle, and a lot more part of engineering construction. The
problems happened associated with welding are common issues in these fields, especially corrosion.
Corrosion can be reduced with many methods, they are painting, controlling humidity, and also good
welding design. In the research, it can be found that reducing residual stress on the welding can be
solved in corrosion rate reduction problem.
Preheating on 500oC and 600oC give better condition to reduce corosion rate than condition after
preheating 400oC. For all welding groove type, material with 500oC and 600oC preheating after 14 days
corrosion test is 0,5%-0,69% lost. Material with 400oC preheating after 14 days corrosion test is 0,57%-0,76%
lost.
Welding groove also influence corrosion rate. X and V type welding groove give better condition to reduce
corrosion rate than use 1/2V and 1/2 X welding groove. After 14 days corrosion test, the samples with
X welding groove type is 0,5%-0,57% lost. The samples with V welding groove after 14 days corrosion test is
0,51%-0,59% lost. The samples with 1/2V and 1/2X welding groove after 14 days corrosion test is 0,58%-
0,71% lost.
Router 1X3 – RTL Design and VerificationIJERD Editor
Routing is the process of moving a packet of data from source to destination and enables messages
to pass from one computer to another and eventually reach the target machine. A router is a networking device
that forwards data packets between computer networks. It is connected to two or more data lines from different
networks (as opposed to a network switch, which connects data lines from one single network). This paper,
mainly emphasizes upon the study of router device, it‟s top level architecture, and how various sub-modules of
router i.e. Register, FIFO, FSM and Synchronizer are synthesized, and simulated and finally connected to its top
module.
Active Power Exchange in Distributed Power-Flow Controller (DPFC) At Third Ha...IJERD Editor
This paper presents a component within the flexible ac-transmission system (FACTS) family, called
distributed power-flow controller (DPFC). The DPFC is derived from the unified power-flow controller (UPFC)
with an eliminated common dc link. The DPFC has the same control capabilities as the UPFC, which comprise
the adjustment of the line impedance, the transmission angle, and the bus voltage. The active power exchange
between the shunt and series converters, which is through the common dc link in the UPFC, is now through the
transmission lines at the third-harmonic frequency. DPFC multiple small-size single-phase converters which
reduces the cost of equipment, no voltage isolation between phases, increases redundancy and there by
reliability increases. The principle and analysis of the DPFC are presented in this paper and the corresponding
simulation results that are carried out on a scaled prototype are also shown.
Mitigation of Voltage Sag/Swell with Fuzzy Control Reduced Rating DVRIJERD Editor
Power quality has been an issue that is becoming increasingly pivotal in industrial electricity
consumers point of view in recent times. Modern industries employ Sensitive power electronic equipments,
control devices and non-linear loads as part of automated processes to increase energy efficiency and
productivity. Voltage disturbances are the most common power quality problem due to this the use of a large
numbers of sophisticated and sensitive electronic equipment in industrial systems is increased. This paper
discusses the design and simulation of dynamic voltage restorer for improvement of power quality and
reduce the harmonics distortion of sensitive loads. Power quality problem is occurring at non-standard
voltage, current and frequency. Electronic devices are very sensitive loads. In power system voltage sag,
swell, flicker and harmonics are some of the problem to the sensitive load. The compensation capability
of a DVR depends primarily on the maximum voltage injection ability and the amount of stored
energy available within the restorer. This device is connected in series with the distribution feeder at
medium voltage. A fuzzy logic control is used to produce the gate pulses for control circuit of DVR and the
circuit is simulated by using MATLAB/SIMULINK software.
Study on the Fused Deposition Modelling In Additive ManufacturingIJERD Editor
Additive manufacturing process, also popularly known as 3-D printing, is a process where a product
is created in a succession of layers. It is based on a novel materials incremental manufacturing philosophy.
Unlike conventional manufacturing processes where material is removed from a given work price to derive the
final shape of a product, 3-D printing develops the product from scratch thus obviating the necessity to cut away
materials. This prevents wastage of raw materials. Commonly used raw materials for the process are ABS
plastic, PLA and nylon. Recently the use of gold, bronze and wood has also been implemented. The complexity
factor of this process is 0% as in any object of any shape and size can be manufactured.
Spyware triggering system by particular string valueIJERD Editor
This computer programme can be used for good and bad purpose in hacking or in any general
purpose. We can say it is next step for hacking techniques such as keylogger and spyware. Once in this system if
user or hacker store particular string as a input after that software continually compare typing activity of user
with that stored string and if it is match then launch spyware programme.
A Blind Steganalysis on JPEG Gray Level Image Based on Statistical Features a...IJERD Editor
This paper presents a blind steganalysis technique to effectively attack the JPEG steganographic
schemes i.e. Jsteg, F5, Outguess and DWT Based. The proposed method exploits the correlations between
block-DCTcoefficients from intra-block and inter-block relation and the statistical moments of characteristic
functions of the test image is selected as features. The features are extracted from the BDCT JPEG 2-array.
Support Vector Machine with cross-validation is implemented for the classification.The proposed scheme gives
improved outcome in attacking.
Secure Image Transmission for Cloud Storage System Using Hybrid SchemeIJERD Editor
- Data over the cloud is transferred or transmitted between servers and users. Privacy of that
data is very important as it belongs to personal information. If data get hacked by the hacker, can be
used to defame a person’s social data. Sometimes delay are held during data transmission. i.e. Mobile
communication, bandwidth is low. Hence compression algorithms are proposed for fast and efficient
transmission, encryption is used for security purposes and blurring is used by providing additional
layers of security. These algorithms are hybridized for having a robust and efficient security and
transmission over cloud storage system.
Application of Buckley-Leverett Equation in Modeling the Radius of Invasion i...IJERD Editor
A thorough review of existing literature indicates that the Buckley-Leverett equation only analyzes
waterflood practices directly without any adjustments on real reservoir scenarios. By doing so, quite a number
of errors are introduced into these analyses. Also, for most waterflood scenarios, a radial investigation is more
appropriate than a simplified linear system. This study investigates the adoption of the Buckley-Leverett
equation to estimate the radius invasion of the displacing fluid during waterflooding. The model is also adopted
for a Microbial flood and a comparative analysis is conducted for both waterflooding and microbial flooding.
Results shown from the analysis doesn’t only records a success in determining the radial distance of the leading
edge of water during the flooding process, but also gives a clearer understanding of the applicability of
microbes to enhance oil production through in-situ production of bio-products like bio surfactans, biogenic
gases, bio acids etc.
Gesture Gaming on the World Wide Web Using an Ordinary Web CameraIJERD Editor
- Gesture gaming is a method by which users having a laptop/pc/x-box play games using natural or
bodily gestures. This paper presents a way of playing free flash games on the internet using an ordinary webcam
with the help of open source technologies. Emphasis in human activity recognition is given on the pose
estimation and the consistency in the pose of the player. These are estimated with the help of an ordinary web
camera having different resolutions from VGA to 20mps. Our work involved giving a 10 second documentary to
the user on how to play a particular game using gestures and what are the various kinds of gestures that can be
performed in front of the system. The initial inputs of the RGB values for the gesture component is obtained by
instructing the user to place his component in a red box in about 10 seconds after the short documentary before
the game is finished. Later the system opens the concerned game on the internet on popular flash game sites like
miniclip, games arcade, GameStop etc and loads the game clicking at various places and brings the state to a
place where the user is to perform only gestures to start playing the game. At any point of time the user can call
off the game by hitting the esc key and the program will release all of the controls and return to the desktop. It
was noted that the results obtained using an ordinary webcam matched that of the Kinect and the users could
relive the gaming experience of the free flash games on the net. Therefore effective in game advertising could
also be achieved thus resulting in a disruptive growth to the advertising firms.
Hardware Analysis of Resonant Frequency Converter Using Isolated Circuits And...IJERD Editor
-LLC resonant frequency converter is basically a combo of series as well as parallel resonant ckt. For
LCC resonant converter it is associated with a disadvantage that, though it has two resonant frequencies, the
lower resonant frequency is in ZCS region[5]. For this application, we are not able to design the converter
working at this resonant frequency. LLC resonant converter existed for a very long time but because of
unknown characteristic of this converter it was used as a series resonant converter with basically a passive
(resistive) load. . Here, it was designed to operate in switching frequency higher than resonant frequency of the
series resonant tank of Lr and Cr converter acts very similar to Series Resonant Converter. The benefit of LLC
resonant converter is narrow switching frequency range with light load[6] . Basically, the control ckt plays a
very imp. role and hence 555 Timer used here provides a perfect square wave as the control ckt provides no
slew rate which makes the square wave really strong and impenetrable. The dead band circuit provides the
exclusive dead band in micro seconds so as to avoid the simultaneous firing of two pairs of IGBT’s where one
pair switches off and the other on for a slightest period of time. Hence, the isolator ckt here is associated with
each and every ckt used because it acts as a driver and an isolation to each of the IGBT is provided with one
exclusive transformer supply[3]. The IGBT’s are fired using the appropriate signal using the previous boards
and hence at last a high frequency rectifier ckt with a filtering capacitor is used to get an exact dc
waveform .The basic goal of this particular analysis is to observe the wave forms and characteristics of
converters with differently positioned passive elements in the form of tank circuits.
Simulated Analysis of Resonant Frequency Converter Using Different Tank Circu...IJERD Editor
LLC resonant frequency converter is basically a combo of series as well as parallel resonant ckt. For
LCC resonant converter it is associated with a disadvantage that, though it has two resonant frequencies, the
lower resonant frequency is in ZCS region [5]. For this application, we are not able to design the converter
working at this resonant frequency. LLC resonant converter existed for a very long time but because of
unknown characteristic of this converter it was used as a series resonant converter with basically a passive
(resistive) load. . Here, it was designed to operate in switching frequency higher than resonant frequency of the
series resonant tank of Lr and Cr converter acts very similar to Series Resonant Converter. The benefit of LLC
resonant converter is narrow switching frequency range with light load[6] . Basically, the control ckt plays a
very imp. role and hence 555 Timer used here provides a perfect square wave as the control ckt provides no
slew rate which makes the square wave really strong and impenetrable. The dead band circuit provides the
exclusive dead band in micro seconds so as to avoid the simultaneous firing of two pairs of IGBT’s where one
pair switches off and the other on for a slightest period of time. Hence, the isolator ckt here is associated with
each and every ckt used because it acts as a driver and an isolation to each of the IGBT is provided with one
exclusive transformer supply[3]. The IGBT’s are fired using the appropriate signal using the previous boards
and hence at last a high frequency rectifier ckt with a filtering capacitor is used to get an exact dc
waveform .The basic goal of this particular analysis is to observe the wave forms and characteristics of
converters with differently positioned passive elements in the form of tank circuits. The supported simulation
is done through PSIM 6.0 software tool
Amateurs Radio operator, also known as HAM communicates with other HAMs through Radio
waves. Wireless communication in which Moon is used as natural satellite is called Moon-bounce or EME
(Earth -Moon-Earth) technique. Long distance communication (DXing) using Very High Frequency (VHF)
operated amateur HAM radio was difficult. Even with the modest setup having good transceiver, power
amplifier and high gain antenna with high directivity, VHF DXing is possible. Generally 2X11 YAGI antenna
along with rotor to set horizontal and vertical angle is used. Moon tracking software gives exact location,
visibility of Moon at both the stations and other vital data to acquire real time position of moon.
“MS-Extractor: An Innovative Approach to Extract Microsatellites on „Y‟ Chrom...IJERD Editor
Simple Sequence Repeats (SSR), also known as Microsatellites, have been extensively used as
molecular markers due to their abundance and high degree of polymorphism. The nucleotide sequences of
polymorphic forms of the same gene should be 99.9% identical. So, Microsatellites extraction from the Gene is
crucial. However, Microsatellites repeat count is compared, if they differ largely, he has some disorder. The Y
chromosome likely contains 50 to 60 genes that provide instructions for making proteins. Because only males
have the Y chromosome, the genes on this chromosome tend to be involved in male sex determination and
development. Several Microsatellite Extractors exist and they fail to extract microsatellites on large data sets of
giga bytes and tera bytes in size. The proposed tool “MS-Extractor: An Innovative Approach to extract
Microsatellites on „Y‟ Chromosome” can extract both Perfect as well as Imperfect Microsatellites from large
data sets of human genome „Y‟. The proposed system uses string matching with sliding window approach to
locate Microsatellites and extracts them.
Importance of Measurements in Smart GridIJERD Editor
- The need to get reliable supply, independence from fossil fuels, and capability to provide clean
energy at a fixed and lower cost, the existing power grid structure is transforming into Smart Grid. The
development of a smart energy distribution grid is a current goal of many nations. A Smart Grid should have
new capabilities such as self-healing, high reliability, energy management, and real-time pricing. This new era
of smart future grid will lead to major changes in existing technologies at generation, transmission and
distribution levels. The incorporation of renewable energy resources and distribution generators in the existing
grid will increase the complexity, optimization problems and instability of the system. This will lead to a
paradigm shift in the instrumentation and control requirements for Smart Grids for high quality, stable and
reliable electricity supply of power. The monitoring of the grid system state and stability relies on the
availability of reliable measurement of data. In this paper the measurement areas that highlight new
measurement challenges, development of the Smart Meters and the critical parameters of electric energy to be
monitored for improving the reliability of power systems has been discussed.
Study of Macro level Properties of SCC using GGBS and Lime stone powderIJERD Editor
One of the major environmental concerns is the disposal of the waste materials and utilization of
industrial by products. Lime stone quarries will produce millions of tons waste dust powder every year. Having
considerable high degree of fineness in comparision to cement this material may be utilized as a partial
replacement to cement. For this purpose an experiment is conducted to investigate the possibility of using lime
stone powder in the production of SCC with combined use GGBS and how it affects the fresh and mechanical
properties of SCC. First SCC is made by replacing cement with GGBS in percentages like 10, 20, 30, 40, 50 and
by taking the optimum mix with GGBS lime stone powder is blended to mix in percentages like 5, 10, 15, 20 as
a partial replacement to cement. Test results shows that the SCC mix with combination of 30% GGBS and 15%
limestone powder gives maximum compressive strength and fresh properties are also in the limits prescribed by
the EFNARC.
Study of Macro level Properties of SCC using GGBS and Lime stone powder
Welcome to International Journal of Engineering Research and Development (IJERD)
1. International Journal of Engineering Research and Development
e-ISSN: 2278-067X, p-ISSN: 2278-800X, www.ijerd.com
Volume 6, Issue 5 (March 2013), PP. 46-52
Three-generation Power Plant with High-temperature
Fuel Cells for Complex Buildings
Done J. Tashevski1, Igor K. Shesho2
1,2
University "Ss. Cyril i Methodius", Faculty of Mechanical Engineering, Skopje, Macedonia
Abstract:– The paper analyses the application of three-generation power plants with high-temperature
fuel cells in complex buildings. Optimization and calculation for these power plants is done using
software package developed in the Faculty for mechanical engineering Skopje. Software package is
composed of several subprograms for calculation of power plants with or without fuel cells. Variables
are optimized by the method of successive approaches and as criteria for optimization is used the
maximum overall exergy efficiency. The software package is verified by comparing the results with
the collected parameters of existing power plants or power plants which are still in the research phase.
Economy and ecology analysis is provided for this type of power plants.
Keywords:– Three-generation, Fuel Cell, Software Package, Optimization, Calculation, Exergy
Efficiency
I. INTRODUCTION
The world energy situation requires significant progress to be made in the rational energy usage i.e
energy efficiency regarding the building sector and energy power plants energy cycles. Energy efficiency
definition and philosophy clearly defines the directions – doing more with less in same time considering the
environment impact. Also, energy efficiency is a way to save energy while meeting current and future energy
needs without changing requirements (conditions) to the consumer. Energy efficiency is a number of measures
to save energy and one of them is to find new effective ways to produce energy [1].
Cogeneration and three-generation fuel cells power plant are characterized with its high efficiency in
the process for production of electrical (electricity) and thermal (heat) power [2], [3]. Because of its high
efficiency they are subject of research of many researchers engaged in modelling of modern power systems [4]-
[11]. These plants regarding the fuel type utilization can use classic fuels (solid, liquid and gas), hydrogen-rich
gaseous fuels derived in different ways and pure hydrogen [12]-[14]. Therefore, these power plants are among
the group's most promising for the process of production of energy. Mostly applied are high-temperature solid
oxide fuel cells (SOFC) in which despite receiving electricity gets a considerable amount of heat output from the
fuel cell [15]-[18].
Building sector in most countries is responsible for at least 40 % of the energy use, therefore the
potential for energy savings is significant [19]. Complex buildings are buildings that need electricity and
thermal energy for various needs such as heating/cooling, steam (sterilization, laundry, etc.), and domestic
(sanitary) hot water.
Application of the three-generation power plants with fuel cells depends on their profitability.
Limitation of installing these facilities is relatively high price of fuel cells, which in the near future is expected
to be equal the price of other power plants. For this purpose, is made an economic analysis of these power plants
[20]-[26].
Emissions of harmful substances in the air are rising especially worrying trend have CO2 emissions
caused by excessive consumption of fossil fuels. Therefore, the term energy efficiency in buildings involves a
wide range of measures to reduce consumption of all types of fuels [27], [28].
For these reasons the right choice of efficient power plants to supply the complex building is very
important and as a result the worldwide are installed and analyzed a number of these combined power plants.
II. THREE-GENERATION POWER PLANT WITH HIGH-TEMPERATURE SOFC
Three-generation power plants with high-temperature solid oxide fuel cells (TPFC) are a combined
power plants for production of electrical and thermal (heat) energy, which in summer is used in absorption
chillers for cooling. That means TPFC fully satisfy the energy needs of complex buildings, i.e. in addition to the
production of electrical energy they produce thermal energy required for heating/cooling, steam for various
purposes, and sanitary hot water.
46
2. Three-generation Power Plant with High-temperature Fuel Cells for...
Fig.1: Three-generation pover plant with high-temperature SOFC
Scheme of selected TPFC with the characteristic points is shown Fig. 1. These plants consist of high-
temperature solid oxide fuel cell (SOFC), air compressor (C), heat recovery steam generator (HRSG), heat
exchangers and absorption chiller.
Required compressed air temperature level is reached in the recuperator (R) which utilizes the heat of
the flue gases from the fuel cell. Small percentage of unburned fuel and carbon monoxide additionally burns to a
combustion chamber (CC), located at the exit of the fuel cell, which causes an increase in the output of the fuel
cell temperature above 1000 °C (for this power plant 1041 °C).
Flue gas leaves with high temperature (about 570 °C), which is utilized in the HRSG. If the HRSG
requires higher parameters there is a possibility of installation (before HRSG) channel burner for additional
combustion, which is not provided in the specific case of the selected building.
The steam generated in the HRSG is used for heat consumers (machines for drying and processing,
sterilization, laundry, etc.). Part of the steam is used to heating and cooling the building (HE and ACH) and rest
for domestic hot water (SWE). Energy demand for selected building is shown in Table I.
A. Characteristics of SOFC
TPFC apply SOFC which operates at a temperature about 1000 °C and pressure of 0.3 MPa. This type
of fuel cell is the product of the Siemens-Westinghouse, specializing in the production of tubular (cylindrical)
SOFC. Last their individual fuel cell is a model with the following characteristics [3], [15]-[18]:
Diameter 0.4 m, height 2 m
Power of an individual cell 315 W
Power of a module 1.5-2.0 MW
Number of individual cells in a module 4760-6400
The plant runs on natural gas which is desirable fuel for combustion in fuel cells and also ecology
favorable fuel. Modular SOFC are with internal reforming of natural gas (99 % methane) into hydrogen which is
the primary fuel for combustion in fuel cells. Internal reforming of natural gas needs additional heat provided by
heat recirculation of the anode, which causes a drop in temperature before combustion chamber of the fuel cell.
Fuel brings the anode and cathode air (oxidant) [3].
Табle I: Energy demand of complex building
Energy Power kW Flow kg/s Parameters
Electrical energy (electricity) 100 - -
Heat consumer (thermal energy) 500 Steam/msHC 0.24 0.4 MPa and 150 °C
Heating (thermal energy) 700 Water/mwH 8.35 90/70 °C
Cooling (thermal energy) 700 Water/mwC 33.4 88/83 °C
Domestic hot water (thermal energy) 50 Water/mwSW 0.3 50 °C
47
3. Three-generation Power Plant with High-temperature Fuel Cells for...
Fig.2: Block diagram of model for optimization and calculation of TPFC (software package)
B. Model for optimization and calculation of TCFC
Optimization and calculation of TPFC is done with the software package developed in our faculty.
Software package is composed of several subprograms for calculation of power plant with and without fuel cells.
Input data (variables) for the fuel cell are optimized by the method of successive approaches and as optimization
criteria is the maximum overall exergy efficiency [6]. Other input data for calculation of TPFC included as
standard or maximum values, characteristic of a particular plant (Table II).
Assessment of the validity of the results obtained with the mathematical model is done by comparing
the data of gas fuel power plant collected from the literature sources [3]-[10]. Comparison is done on the results
obtained with the used model of the TPFC on gas fuels and existing plant with a power of 4 MW on natural gas,
product one of the leading companies in this field Siemens-Westinghouse with assistance from the U.S.
company Heron [3]. Obtained results (parameters) from the model are very close to the parameters of the
selected power plant. It must be noted that the considered power plant is a combination of modular fuel cell and
gas-turbine. However, it does not diminish the reliability of the obtained results, because all the characteristic
variables of this plant are covered by the optimization and calculation [6].
Optimization and calculation of electric and overall power plant efficiency apply exergy (entropic)
method which gives a more realistic overview of the size of the efficiency. Applying classical method gives
unrealistically high values of the efficiency which is result of simply summary of electrical and thermal energy.
For this purpose the entire system is analyzed and calculated with using exergy method. Classical thermal
method is used for comparing the obtained results [4], [11].
Table II: Input data and results from optimization of TPFC:
Enter data/Results Value/Field/Step Procedure (*)
Voltage of individual fuel cell VFC V 0.7/0.5-0.7/0.1 O
Fuel utilization Uf % 93/93-98/1 O
Oxidant utilization Uo % 85/75-85/1 O
Fuel inlet temperature Tf K 823/783-823/1 O
Oxidant inlet temperature To K 973/973-1023/1 O
Compressor inlet temperature T1 K 288 S
Compressor pressure ratio C - 3/1-15/1 O
HRSG steam outlet pressure pа MPa 0.4/0.1-14/0.1 O
HRSG steam outlet pressure ta °C 150 S
exTPFC
-
Maximum exergy overall efficiency 0.667 Optimization criteria
(*) S-standard (maksimum) values O-values obtained by optimization
48
4. Three-generation Power Plant with High-temperature Fuel Cells for...
For determining the electrical and overall efficiency of the TPFC an exergy method is applied:
ex eTPFC ex tTPFC PeTPFC ex tTPFC
exBCFC (1)
exQ d B f ed
Where: change of exergy during the production of electrical energy ΔexeTPFC kW (values are very near
to the electrical power PeTPFC kW), change of exergy during the production of thermal power (heat) Δex tTPFC kW,
brought (inlet) exergy with the fuel exQd kW, specific exergy of the fuel ed kJ/kg (for natural gas is equal to the
LHV), total fuel consumption Bf kg/s.
The following general equation is used for determination the change of exergy Δex kW:
ex m h To s (2)
Where: flow m kg/s, change of specific enthalpy Δh kJ/kg, environment temperature T o K, change of
specific entropy Δs kJ/kgK.
Applying the exergy method in the calculations, results with values for change of exergy during the
production of electrical energy which are very near with electrical power according the thermal method (low
change of entropy). Significant differences appear in change exergy during the production of thermal energy
(heat) compared with values obtained by thermal method (significant change of entropy). Values of the specific
exergy of the gas fuels are very close to the LHV values.
Natural gas characteristics used in these power plants such as: composition, density and lower heat
value (LHV) are equal to the applied in Macedonia (NG density 0.7 kg/m3 and LHV = 33500 kJ/m3) [12]-[14].
This approach is supported by many authors, such as Kotas [11], who works on the problem of
modelling and calculation of modern energy systems.
C. Results from optimization and calculation of TCFC
Results (output data) obtained from the software package are shown in Table III. From the table III we
can see that the electrical power of 4000 kW are receive in a modular SOFC with efficiency of 59.5 %. Part of
that power of 300 kW is spent in the air compressor and the net electricity produced from TPFC is 3700 kW.
Thermal power of HRSG from the gas side is 1500 kW and useful energy required for the building is 1250 kW.
Accordingly electrical efficiency is 59.5 % and the overall exergy efficiency of TCPFC is 66.7 %. Must
say that the efficiency is remarkably high. The applications of these plants that achieve high overall efficiency
66.7% is a challenge for many authors and do in order approximation of efficiency to efficiency of fantastic
Carnot cycle about 78 %.
Table III: Results – output data obtained from the calculation of TPFC:
Parameter Value
Fuel cells (SOFC)
Air flow ma kg/s 2.48
Gases flow mg kg/s 2.61
Fuel consumption B kg/s 0.13
Fuel cells electrical power PeFC kW 4000
Fuel cells electrical efficiency eFC - 0.595
Number of individual fuel cells/modules niFC/ nmFC - 13092/2
Fuel cells area AFC m2 5.95
Fuel cells dimension a/b/c m/m/m 2/3/2.5
Fuel cells gases outlet temperature t4 °C 1041
Air compressor (C), HRSG and heat exchangers (HE)
Air compressor power PC kW 300
HRSG thermal power QtHRSG kW 1500
HRSG gases inlet temperature t5 °C 570
HRSG outlet (total) steam flow ms kg/s 0.61
Heat consumer (HC) steam flow msHC kg/s 0.24
HE steam flow for heating/cooling (steam/water) msH/C kg/s 0.34
HE steam flow for sanitary hot water (steam/water) msSW kg/s 0,03
Three-generation power plant with SOFC (TPFC)
TPFC electrical power PeTPFC kW 3700
TPFC thermal power (thermal method) QtTPFC kW 1250
TPFC change of exergy during the production of heat exTPFC kW 450.4
TPFC overall exergy efficiency exTPFC - 0.667
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5. Three-generation Power Plant with High-temperature Fuel Cells for...
Table IV: Comparison with TPFC and classic boiler on natural gas
Parameters TPFC Boiler (NG)
Fuel consumption Bf kg/s 0.13 0.03
Electrical power Pe kW 4000 -
Surplus of electrical power Pes kW 3600 -
Thermal power (HRSG/boiler) Qt kW 1500 1500
Electrical efficiency e - 0.595 -
Overall exergy efficiency ex - 0.667 0.310/thermal 0.870
III. COMPARISON TPFC WITH CLASIC BOILER ON NATURAL GAS
To be able to present the perspective of TPFC comparison is made between TPFC and classic boiler on
natural gas. Boiler facility have characteristics to meet thermal requirements of the building. Electrical energy
provides by other sources of energy (electricity grid, diesel generator or others.). Results from a comparison are
shown in Table IV.
From the table we can see that the required 1500 kW thermal power should be installed TPFC with
total electric power of 4000 kW. Subtracting from the total electric power: 100 kW electrical power for the
building and 300 kW for the air compressor results with 3600 kW net electrical power.
The natural gas boiler can only meet the heating load requirements but for the electrical power it is
necessary to allocate funds.
IV. ECONOMIC ANALISYS – PROFITABILITY CALCULATION
Economic analysis is performed for this power plant which results are presented in the Table V. Can be
concluded that the feasibility of installing these plants primarily depends on the price of natural gas, the specific
cost of the plant, as well as interest rates and inflation.
By the end of the 2015-20 year the cost of fuel cells is expected to equal the price of other power plants,
which states that the calculation of profitability would be more favorable [20]-[26].
Table V: Profitability calculation
Variant 1: Variant 2:
With profit Without profit
derived from heat derived from heat
Hours 7000 h/god 7000 h/god
Price of electricity 0.137 $/kWh 0.137 $/kWh
Price of heat 0.144 $/kWh 0.144 $/kWh
Price of natural gas 0.88 $/kg 0.88 $/kg
Electrical power 4000 kW 4000 kW
Net electrical power (electricity) 3600 kW 3600 kW
Thermal power (heat) 1250 kW 0 kW
Fuel consumption 0,13 kg/s 0..13 kg/s
Power plant specific investment 2000 $/kW 2000 $/kW
Power plant investment 8000000 $ 8000000 $
Total investment 20000000 $ 20000000 $
Real interest 4.45 % 4.45 %
Profit (electricity) 3452400 $/god 3452400 $/god
Profit (heat) 1008000 $/god 0 $/god
Total profit 4460400 $/god 3452400 $/god
Fuel costs 2882880 $/god 2882880 $/god
Wage costs 14400 $/god 14400 $/god
Amortization 400000 $/god 400000 $/god
O&M costs 312228 $/god 241668 $/god
Other costs 120000 $/god 120000 $/god
Total costs 3729508 $/god 3658948 $/god
Simple payback 5.32 god 6.85 god
IRR 16.11 % 11.97 %
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6. Three-generation Power Plant with High-temperature Fuel Cells for...
Considered are two variants of the calculation of profitability. The first variant is with the profits
derived from thermal energy, i.e. in the case of requirement of thermal energy (heat) of the building would be
purchased from another producer. The second variant is without the profits derived from thermal energy (heat),
i.e. in the case of thermal energy building requirements would be generated in classic boiler on natural gas.
Simple payback period for first variant would have been 5.32 years and second variant 6.85 years.
TPFC both variants makes a profit from the sale of surplus electricity, unlike use the classic boiler for thermal
energy requirements of the building makes the only cost for buying fuel.
V. ECOLOGICAL ANALYSIS - ECOLOGICAL BENEFITS
For the determination of the emission of pollutants from TPFC will be used standard emission factors
of different pollutants for different types of fuel. In Macedonia used emission factors per unit of burnt fuel.
Emission factors used in our country in accordance with the EU emission factors proposed by the EPA [27],
[28].
These emission factors for natural gas are shown in Table VI. For this purpose, a comparison is made
with natural gas boiler that is used for thermal energy production and electricity is provided from the power grid.
From the diagram in Fig. 3 can be seen that TPFC achieves 2.3 times less emissions of CO2 and NOx.
Table VI: TPFC emissions and specific emissions of CO2 и NOx
CO2 NOx
Emission factor Ef g/MJ 55.9 0.06
Emission E g/s 347.78 0.37
Specific emission e g/kWh 313.00 0.34
800.00 1.00
600.00 0.80
Emission
Emission
0.60
400.00
0.40
200.00
0.20
0.00 0.00
TPFC Boiler and Grid TPFC Boiler and Grid
Emission CO2 g/s 347.78 778.04 Emission NOx g/s 0.37 0.84
Fig.3: Comparison between TPFC and boiler on natural gas for production of thermal (heat) energy
VI. CONCLUSIONS
Based on what has been done it can be concluded that TPFC very practical can meet the electrical and
thermal needs of a building, and always exists a chance of getting profit from the sale of surplus of electricity
(presented example). These plants have a series of advantages:
Three-generation power plant with high-temperature fuel cells achieve very high efficiency about 67 %
Able to use any kind of fuel, and hydrogen
Able to install for different power and be used as an independent source for production of electrical and
thermal energy for complex building
Fuel cells operate at constant parameters and uninterrupted supply the building with constant amount of
electricity and heat
The current status of fuel cells provides a relatively long lifetime up to 70 000 h.
Emissions of pollutants is low, that they are environmentally friendly
Fuel cell works completely silently, because there are no rotation parts.
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