Solar-Organic Rankine Cycle. Basic idea of Organic-Rankine cycle. Comparison of various working fluid for a Solar ORC based on the tests conducted on a simple ORC system of 2KW capacity operating on a solar water heater (water temp. 90C) as a source of heat. Comparison made on the basis of efficiency, pressure ratio, turbine exit volume flow rate, mass flow rate, heat input, Environmental considerations, toxicity, flammability.
Fossil fuel consumption in the recent years has been increasing and the burning of fossil fuel is said to be a major contributor towards global warming, acid rains, air, water and soil pollution, forest devastation and radioactive substances emissions. Besides the environment, the fossil fuel prices fluctuate considerably, usually going up and being very expensive in many countries.
Most importantly, the quantity of fossil fuels, like petroleum,natural gas, and coal can only decrease since they are non-renewable resources.
As a result many countries have been investing billions of dollars in new technologies and demand for sophisticated power supply options is greatly increased.
In a typical developed country as much as 40% of total fuel consumption is used for industrial and domestic space heating and process heating. Of this around one third is wasted.
Currently recovering low temperature heat which includes Industrial waste heat, geothermal energy, solar heat, biomass and so on could be a very critical and sustainable way to solve energy crisis. Utilising waste heats along with attempts for the use of renewable sources as low grade thermal heat has motivated us to develop a project based on ORC.
one of the renewable energy resources project that help me lot to my carrier in research field : this slide is for the prototype model that i design actual full scale size may be bit of different from my calculations and data's
Make power out of your waste heat - Organic Rankine Cycle Sindhu Maiyya
How to utilize the waste heat generated by pretty much all the processes we engage in. An idea to convert the waste heat into useful power.
A presentation give in the finals of Schenider Electric Go Green in the City Challenge -2012
Fossil fuel consumption in the recent years has been increasing and the burning of fossil fuel is said to be a major contributor towards global warming, acid rains, air, water and soil pollution, forest devastation and radioactive substances emissions. Besides the environment, the fossil fuel prices fluctuate considerably, usually going up and being very expensive in many countries.
Most importantly, the quantity of fossil fuels, like petroleum,natural gas, and coal can only decrease since they are non-renewable resources.
As a result many countries have been investing billions of dollars in new technologies and demand for sophisticated power supply options is greatly increased.
In a typical developed country as much as 40% of total fuel consumption is used for industrial and domestic space heating and process heating. Of this around one third is wasted.
Currently recovering low temperature heat which includes Industrial waste heat, geothermal energy, solar heat, biomass and so on could be a very critical and sustainable way to solve energy crisis. Utilising waste heats along with attempts for the use of renewable sources as low grade thermal heat has motivated us to develop a project based on ORC.
one of the renewable energy resources project that help me lot to my carrier in research field : this slide is for the prototype model that i design actual full scale size may be bit of different from my calculations and data's
Make power out of your waste heat - Organic Rankine Cycle Sindhu Maiyya
How to utilize the waste heat generated by pretty much all the processes we engage in. An idea to convert the waste heat into useful power.
A presentation give in the finals of Schenider Electric Go Green in the City Challenge -2012
Download Link (Copy URL):
https://sites.google.com/view/varunpratapsingh/teaching-engagements
Syllabus:
Availability and Irreversibility
Availability Function
Second Law Efficiencies
Work Potential Associated with Internal Energy
Waste Heat Recovery
Heat Losses – Quality vs. Quantity
Principle of Heat Recovery Units
Classification of WHRS on Temperature Range Bases
Commercial Viable Waste Heat Recovery Devices
Benefits of Waste Heat Recovery
Development of a Waste Heat Recovery System
Commercial Waste Heat Recovery Devices
West Heat Recovery Boiler (WHRB)
Recuperators- Regenerative, Ceramic, Regenerative Heat Exchanger
Thermal wheel/ Heat Wheel
Heat Pipe
Economiser
Feed Water
Heat Pump
Shell and Tube Heat Exchanger
Plate Heat Exchanger
Run-around coil
Direct Contact Heat Exchanger
Advantages and Limitations of WHRD’s
boiler accessories, basics of economizer, types of economizer, air preheater, types of air preheater, reheater, basics of superheater, types of superheater.
Phase Change Materials(PCM) based solar refrigerationVishvesh Shah
Topics to be Covered
Refrigeration Using solar Energy
Introduction
Solar PV Based Refrigeration
Solar Absorption Refrigeration
Energy Storage Systems
Battery
Phase Change Materials
Solar Refrigeration System Model Studies
Solar powered refrigerator with Thermal Energy Storage
Solar Direct Drive Refrigerator for Vaccine Storage
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
The presentation gives a basic idea of cooling towers in big industries including the Power Plants. The performance of cooling towers and the commonenly used terms with reference to the cooling towers are also discussed at length. Care to be taken while in freezing temperatures in the European countries is also discussed.
Super Critical Technology-Fundamental Concepts about Super Critical Technolog...Raghab Gorain
Nicely describe everything about super critical technology in thermal power plant.This slide is very useful for the freshers.Anybody can get the basic fundamental idea about super critical technology from this slide. In India now we have to think some new technology for power sources as sub critical power plants are less efficient and emit more pollutant to the environment and the alternative is the 'Super Critical Power Plant'.
Classification of Steam Boilers based on different factors. Cochran, Babcock Wilcox, Lancashier etc. Accessories of steam boilers like economiser, superheater, steam separator, air preheater. Boiler Mountings like pressure gauges, feed check valve, steam stop valve, safety valves, water gauges, blowdown valves, scum valves, salinometer cocks etc.
The ppt contains detailed study of refrigerants used in refrigeration and air conditioning system with description. It is well formed as per the syllabus of GTU.
Download Link (Copy URL):
https://sites.google.com/view/varunpratapsingh/teaching-engagements
Syllabus:
Availability and Irreversibility
Availability Function
Second Law Efficiencies
Work Potential Associated with Internal Energy
Waste Heat Recovery
Heat Losses – Quality vs. Quantity
Principle of Heat Recovery Units
Classification of WHRS on Temperature Range Bases
Commercial Viable Waste Heat Recovery Devices
Benefits of Waste Heat Recovery
Development of a Waste Heat Recovery System
Commercial Waste Heat Recovery Devices
West Heat Recovery Boiler (WHRB)
Recuperators- Regenerative, Ceramic, Regenerative Heat Exchanger
Thermal wheel/ Heat Wheel
Heat Pipe
Economiser
Feed Water
Heat Pump
Shell and Tube Heat Exchanger
Plate Heat Exchanger
Run-around coil
Direct Contact Heat Exchanger
Advantages and Limitations of WHRD’s
boiler accessories, basics of economizer, types of economizer, air preheater, types of air preheater, reheater, basics of superheater, types of superheater.
Phase Change Materials(PCM) based solar refrigerationVishvesh Shah
Topics to be Covered
Refrigeration Using solar Energy
Introduction
Solar PV Based Refrigeration
Solar Absorption Refrigeration
Energy Storage Systems
Battery
Phase Change Materials
Solar Refrigeration System Model Studies
Solar powered refrigerator with Thermal Energy Storage
Solar Direct Drive Refrigerator for Vaccine Storage
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
The presentation gives a basic idea of cooling towers in big industries including the Power Plants. The performance of cooling towers and the commonenly used terms with reference to the cooling towers are also discussed at length. Care to be taken while in freezing temperatures in the European countries is also discussed.
Super Critical Technology-Fundamental Concepts about Super Critical Technolog...Raghab Gorain
Nicely describe everything about super critical technology in thermal power plant.This slide is very useful for the freshers.Anybody can get the basic fundamental idea about super critical technology from this slide. In India now we have to think some new technology for power sources as sub critical power plants are less efficient and emit more pollutant to the environment and the alternative is the 'Super Critical Power Plant'.
Classification of Steam Boilers based on different factors. Cochran, Babcock Wilcox, Lancashier etc. Accessories of steam boilers like economiser, superheater, steam separator, air preheater. Boiler Mountings like pressure gauges, feed check valve, steam stop valve, safety valves, water gauges, blowdown valves, scum valves, salinometer cocks etc.
The ppt contains detailed study of refrigerants used in refrigeration and air conditioning system with description. It is well formed as per the syllabus of GTU.
Development of a 300 kWe Integrated Axial Turbine and Generator for ORC Appli...Keith D. Patch
2nd International Seminar on ORC Power Systems: Turbo Expanders II, Rotterdam, The Netherlands
Publisher: ASME, International Gas Turbine Institute (IGTI)
Abstract
Concepts NREC has completed its design and development of an integrated high speed axial turbine and permanent magnet generator. The Turbine –Generator Unit (TGU) is ideal for ORC applications for its compactness, reliability, and versatility. The 20,000 rpm TGU does not use a shaft seal or gearbox and the generator is evaporatively cooled using the ORC working fluid. The TGU is designed with the intent of having the same turbine housing and generator used with a range of operating ORC fluid operating pressures and temperatures to enable its wide spread use in a variety of ORC heat recovery applications. The rotor and nozzle stators are changed to aerodynamically optimize the performance of the turbine at different ORC fluid operating conditions and flow rates. The output voltage of the generator can range from 300 to 480 VAC and at 50 hz and 60 hz. This facilitates its use in waste heat recovery applications throughout the world. This technical paper will review the mechanical and electrical design features of the turbine-generator unit.
ORC Heat-to-Power Systems: Thoughts on Codes, Standards and RegulationsKeith D. Patch
2nd Meeting of the ASME IGTI ORC Power Systems Committee; Technical Subcommittee on Standards and Regulations; ASME Turbo Expo 2014; CCD Congress Center; Dusseldorf, Germany; Tuesday June 13, 2014; 5 - 8 PM CET
Sustained power generation from low-grade heat. sk 270513Alex Prohorov
Minimal estimation for waste heat utilization in Russia is about $300M annually. From more then 4000 GPU we can utilize up to 18 GW additional electric power.
Various heat sources require different technical solutions. Heat-El fits for all.
U.S. Department of Energy 2015 Quadrennial Technology ReviewKeith D. Patch
Instead of reading the complete 505 page QTR document, review this presentation on the U.S. Dept. of Energy's 2015 Quadrennial Technology Review (QTR) by Dr. Lynn Orr, Under Secretary for Science and Energy, US Department of Energy. This presentation was sponsored by the MIT Energy Initiative, was given from 5:00 - 6:00 pm on Thursday, September 24, 2015, and was situated at Building E14, 6th floor, of the MIT Media Lab.
Abstract
The United States is in the midst of an energy revolution. Over the last decade, the United States has slashed net petroleum imports, dramatically increased shale gas production, scaled up wind and solar power, and cut the growth in electricity consumption to nearly zero through widespread efficiency measures. Technology is helping to drive this revolution, enabled by years to decades of research and development that underpin these advances in the energy system. The Department of Energy’s 2015 Quadrennial Technology Review (QTR) examines the status of the science and technology that are the foundation of our energy system, together with the research, development, demonstration, and deployment opportunities to advance them. This analysis is particularly instructive in the run up to the international climate negotiations taking place later this year at the 21st Conference of Parties, as technological advancements will be crucial to achieving global greenhouse gas emissions reductions. During his presentation, Under Secretary for Science and Energy Lynn Orr will provide an overview of the highlights of the QTR report and discuss examples of promising research and development opportunities that can help the nation achieve a low carbon economy.
Presentation for Action Renewables Association
Belfast 30th November 2009
___________________________________
Heat Recovery Ventilation
in
Low Energy / Low CO2
Housing
Thermodynamic Analysis of a Cascade Refrigeration System Based On Carbon Diox...IJERA Editor
Thermodynamic analysis of a cascade refrigeration system that uses carbon dioxide-ammonia (R744-R717) as refrigerant is presented in this paper to determine the optimum condensing temperature of the cascade condenser at given design parameters, to maximize the COP of the system. The design and operating parameters considered in this study include (1) condensing, sub cooling, evaporating and super heating temperatures in the ammonia (R717) high-temperature circuit, (2) temperature difference in the cascade heat exchanger, and (3) evaporating, superheating, condensing and sub cooling in the carbon dioxide (R744) low-temperature circuit. A multilinear regression analysis was employed in order to develop two useful correlations for maximum COP, and optimum condensing temperature.
Energy and Exergy Analysis of a Cogeneration Cycle, Driven by Ocean Thermal E...theijes
Ocean Thermal Energy Conversion (OTEC) is a technology by which thermal energy from the ocean is harnessed and converted into electricity. It is one of the renewable energy technologies being researched into, as part of solutions to the challenge of global warming and climate change. A major setback of this technology, however, is that it has a very low cycle efficiency. In this work a cogeneration cycle is proposed which is driven by the temperature difference between the warm surface layer and the cold bottom layer of the ocean. The work is aimed at improving the overall cycle efficiency of OTEC systems by reducing the depth at which cold water is captured from the ocean. To achieve this, the cycle employs a binary mixture of ammonia and water as the working fluid and uses the mechanism of absorption to obtain the liquid phase of the working fluid after expansion through the turbine. The effects of varying cycle parameters such as the depth of cold-water capture, heat source temperature and mixture composition of the working fluid were investigated. With a basic solution mixture concentration of 0.40 kg/kg NH3/H2O, and under operating conditions of 30oC as the warm surface water temperature and a cold water temperature of 10oC, captured at a depth of 600m the proposed cycle produced a net power output of 42 kW, and a refrigeration capacity of 370 kW. The thermal efficiency computed was 1.94% and the exergy efficiency was 13.78%, both higher than the case where the depth of cold water capture was 1000m.
If the material of liner changed with 2RE 69 or Duplex material instead of SS316(urea grade), then passivation air can be reduced, resulting the energy saving because the inerts vented from M.P section and loss of ammonia and problem of pollution. To enhance capacity and energy of the existing plant the internals like vortex mixture and HET may be changed the capacity may increase up to 10-15%.HET, you can changed with super cup.The CO2 and feed top of the vortex mixture nozzle and Ammonia plus carbamate feed from side of the vortex mixture. In the mixing area the initial dispersion of gas and formation of liquid – gas mixture are performed.
In any thermal power generation plant, heat energy converts into mechanical work. Then it is converted to electrical energy by rotating a generator which produces electrical energy.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
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About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
5. www.company.com
Motivation
Continuous increase in Global Energy demand.
Non Renewable sources (Fossil fuels such as coal,
petroleum and natural gas) still accounting for more
than 78% of the Energy Sources being used in the
world.
Pollution and Global warming because of burning of
fossil fuels.
In this context, using renewable energies like solar
energy, wind energy, biomass and geothermal heat as
well as waste heat for energy production becomes
important.
6. www.company.com
Background
Between 1961 and 1962, Harry Zvi Tabor and Lucien Bronicki
built various Rankine engines using monochlorobenzene at a
maximum temperature of 140–150 °C, and with power capacity
in the 2–10 kW range.
The first geothermal binary ORC power plant was installed in
1967 in the Kamchatka peninsula of the Soviet Union. The
working fluid was the refrigerant 12, and the power
plant featured a gross power of 680 kW. The thermal energy
source was geothermal water at low temperature (80 °C).
Other notable ORC plants include, the 150 kW plant at Coolidge
(Arizona) in 1979; the 37 kW solar engine at Gila Bend
in 1977 ;the 19 kW solar pump at Willard (New Mexico) in 1979
realized by the Sandia National Laboratory.
7. www.company.com
OBJECTIVE
To asses the theoretical performances as well as
thermodynamic and environmental properties of few
substances for use in low-temperature solar organic
Rankine cycle systems, using efficiencies, volume
flow rate, mass flow rate, pressure ratio, toxicity,
flammability, ODP and GWP as parameters for
comparision.
8. www.company.com
ORC SYSTEMS
An Organic Rankine Cycle (ORC) basically
resembles the steam cycle according to
thermodynamic principles. In an ORC, water is
replaced with a high molecular mass organic fluid
with a lower saturated boiling temperature in
comparison with water. Fluid characteristics make
ORC favourable for applications of low temperature
conditions and heat recovery applications at even
lower temperatures.
10. www.company.com
low-temperature solar ORC with
heat storage system
In the present work, the selection of most suitable
fluids for a low-temperature solar organic Rankine
cycle is obtained. Hot water serving as heat source at
maximum temperature of 90 C is produced by
conversion of solar radiation into heat by solar
collectors.
Characteristics of 20 potential working fluids are
evaluated and compared for a 2 kW micro-power
system.
14. www.company.com
low-temperature solar ORC with
heat storage system
Input data for the analysis of the ORC
Evaporating temperature (Te)= 75 C
Condensing temperature (Tc)= 35 C
Mechanical efficiency of the turbine (eff_mt)= 0.63
Isentropic efficiency of the turbine (eff_it)= 0.70
Pump efficiency (eff_p)= 0.80
15. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Cycle Pressure
• Pressure values are in the range 0.1–2.5 MPa and a pressure
ratio(PR) of about 3.5 are considered as good [3][4]
• RC318 (Octafluorocyclobutane) , R600a (iso-butane), R600 (n-
butane), R114(1,2-Dichlorotetrafluoroethane), R601, R500 and
R152a are most suited based on the above criteria.
16. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Turbine outlet volume flow rate
• Turbine outlet volume flow rate determines its size and the
system.
• n-Pentane, R113, cyclohexane, water, ethanol, methanol, R123
and R141b exhibit high volume flow rates.
• Fluids with low volume flow rate are preferable for economic
reasons. Among these are: R32, ammonia, R407C, R290, R500,
R134a (1,1,1,2-Tetrafluoroethane) and R152a
17. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Fig.6:- Turbine outlet volume flow rate versus turbine inlet temperature for
various working fluids at Tc = 35 C.
18. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Cycle Efficiency
Fig.7:- System thermal efficiency versus turbine inlet pressure
for working fluids with high normal boiling points at Tc = 35
C.
Fig.8:- System second law efficiency versus turbine inlet
pressure for working fluids with high normal boiling points at
Tc = 35 C.
19. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Cycle Efficiency
Fig.9:- System thermal efficiency versus turbine inlet pressure
for working fluids with low normal boiling points at Tc = 35 C.
Fig.10:- System second law efficiency versus turbine inlet
pressure for working fluids with low normal boiling points at
Tc = 35 C.
20. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Cycle Efficiency
• For high boiling point fluids water and ethanol are more
efficient
compared to n-Pentane and R123.
• For low boiling point fluids, second law efficiency shows a
maximum) which suggests the existence of an optimal operating
condition.
• System second law efficiency for low boiling point fluids
increases in a short range 0–1.0 MPa and decreases slightly for
higher pressures.
21. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Mass Flow Rate
• Water, ethanol and methanol yield lowest maximum pressures
and highest enthalpy heat of evaporation. Hence require lower
mass flow rates.
• Ammonia, has a higher evaporating pressure, but yields a low
mass flow rate and high heat of vaporization.
• For economical reasons, fluids with low mass flow rates like
ammonia, ethanol and methanol are interesting especially for
large capacity systems
22. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Fig.11:- Mass flow rate versus turbine inlet temperature for various working
fluids at Tc = 35 C.
23. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Analysis of the heat input
System heat input is of great importance in a solar ORC. It
determines the size of the collector array and constitutes major
part of system cost.
• The heat required for a 2 kW power output falls in the range 40–
47 kW. Fluids such as water, ethanol, methanol and ammonia
require lower heat rates.
• The heat transfer rate required decreases as the temperature of
saturated vapor entering the Turbine increases. So depending on
the application, one could choose between system with large
collector area-low temperature and a system with small collector
area-high operating temperature.
24. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Fig.11:- Mass flow rate versus turbine inlet temperature for various working
fluids at Tc = 35 C.
25. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Environmental considerations
• Some substances, mainly refrigerants, deplete the ozone layer
or/and contribute to the global warming. Because of their
negative effects, there is a necessity to choose those with less
harmful effects on the environment
• R12, R113, R114 and R500 cannot be selected owing to their
high ODP and high GWP. RC318 has a GWP of about 10250
and is excluded from the selection.
• There are few substances with low ODP or/and low GWP, like
R141b, R123, R407, R134a, R407C and R32.
• Water, ammonia, and alkanes families are environmentally
friendly substances.
26. www.company.com
Analysis of low-temperature solar
ORC with heat storage system
Safety considerations
• Based on ASHRAE 34 safety classification for refrigerants.
• Alkanes non-toxic but flammable are classA3. They require
safety devices.
• R152a is classified A2 (lower flammability and non-toxic). R12
is B1 (non-flammable but toxic). Ammonia classified B2 (toxic
and has lower flammability limit) could be used in an open space
with lesser precaution compared with alkanes. R134a is of class
A1(non-flammable and non-toxic), i.e. safer compared to other
refrigerants and therefore is the preferred fluid.
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Analysis of low-temperature solar
ORC with heat storage system
Overall analysis
• From the analyses carried out in the previous Sections, none of
the fluids yields all the desirable.
• It is difficult to find an ideal working fluid which exhibits high
efficiencies, low turbine outlet volume flow rate, reasonable
pressures, low ODP, low GWP and is non-flammable, non-toxic
and non-corrosive.
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Analysis of low-temperature solar
ORC with heat storage system
Overall analysis
• Based on different considerations, the following fluids are not
selected
• RC318 (high GWP),
• Cyclohexane (high volume flow rate, high pressure ratio),
• R407C (high evaporator pressure, low efficiency),
• R32 (high evaporator pressure, low efficiency, high moisture
after expansion),
• Ethanol, water, methanol (non-convenient pressure values, high
turbine outlet volume flow rates),
• R12, R113, R114 and R500 (high GWP, high ODP),
• R141b (high turbine outlet volume flow rate, high ODP).
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• Table 2:- Comparison of the performances of different working fluids for a 2 kW
power output.
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Conclusion
Thermodynamic characteristics and performances of different
fluids were analyzed for selection as working fluids in a low-
temperature solar organic Rankine cycle.
Several criteria were used for comparison: pressures, mass and
volume flow rates, efficiencies, cycle heat input, safety and
environmental data.
• Fluids favored by the pressure values are: isentropic fluids,
butanes, n-Pentane and refrigerants R152a, RC318 and R500.
• Low volume flow rates are observed for R32, R134a, R290,
R500 and ammonia.
• High latent heat of vaporization presented by water, methanol,
ethanol and ammonia has as consequences low mass flow rate
and small heat input, which are advantages over the rest of fluids.
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Conclusion
• From an efficiency point of view, fluids with high boiling point
like ammonia, methanol, ethanol and water are very efficient but
the presence of droplets during the expansion process is a
drawback.
• Following the International regulations (Kyoto and Montreal
Protocols), R12, R500, RC318, R114 and R113 are harmful for
the environment.
Concluding, R134a followed by R152a, R600, R600a and
R290 are most suitable fluids for low-temperature
applications driven by heat source temperature below 90 C.
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References
Bertrand Fankam Tchanche , George Papadakis, Gregory
Lambrinos, Antonios Frangoudakis, Fluid selection for a low-
temperature solar organic Rankine cycle, Applied Thermal
Engineering 29 (2009) 2468–2476.
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https://en.wikipedia.org/wiki/Renewable_energy#/media/File:Total_
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working fluid for a Rankine cycle engine, Applied Energy 21
(1985) 1–42.
[4] B. Saleh, G. Koglbauer, M. Wendland, J. Fischer, Working
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