The document summarizes and compares a domestic refrigerator and a compressorless refrigerator. It discusses how domestic refrigerators use refrigerants like CFCs that harm the ozone layer and contribute to global warming. However, a compressorless refrigerator uses thermoelectric modules instead of a compressor and refrigerants. It has fewer parts, is more reliable, and does not produce harmful gases. By using renewable energy sources like solar panels, a compressorless refrigerator can provide cooling without negatively impacting the environment.
Peltier Effect- when a voltage or DC current is applied
to two dissimilar conductors, a circuit can be created that
allows for continuous heat transport between the
conductor’s junctions. The Seebeck Effect- is the reverse
of the Peltier Effect. By applying heat to two different
conductors a current can be generated
This slide is about some new green cooling system (refrigeration system) and green refrigerant. For the Ozone layer depletion and green house effect, it is high time to find new refrigerant and refrigeration system.
Peltier Effect- when a voltage or DC current is applied
to two dissimilar conductors, a circuit can be created that
allows for continuous heat transport between the
conductor’s junctions. The Seebeck Effect- is the reverse
of the Peltier Effect. By applying heat to two different
conductors a current can be generated
This slide is about some new green cooling system (refrigeration system) and green refrigerant. For the Ozone layer depletion and green house effect, it is high time to find new refrigerant and refrigeration system.
“SEMINAR REPORT ON SOLAR ASSISTED VAPOUR ADSORPTION REFRIGERATION SYSTEM”Bhagvat Wadekar
SUMMARY
The range of COP for the Solar VAdRS is 0.2 - 0.7. The development of adsorption system for refrigeration is promising. An overall thermodynamics-based comparison of sorption systems shows that the performance of adsorption systems depends highly on both the adsorption pairs and processes. The technology continues to develop and the cost of producing power with solar thermal adsorption refrigeration is falling. If the costs of fossil fuels, transportation, energy conversion, electricity transmission and system maintenance are taken into account, the cost of energy produced by solar thermal adsorption systems would be much lower than that for conventional refrigeration systems.
The intermittent system has its simplicity and cost effectiveness. However, the main disadvantages such as long adsorption/desorption time have become obstacles for commercial production of the system. Hence, to compete with conventional vapor compression technologies, more efforts should be made in enhancing the COP and SCP. The environmental benefits of this technology and its non-dependence on conventional energy sources makes it highly attractive for further developments and a potential alternative to conventional systems in the future. The future of solar refrigeration and air conditioning seems to be a very good proposition and no doubt will find its place in future industrial applications. The major limiting factor at present is the shape of energy so as to make it available whenever it is required, for example at nights and extended cloudy days when we cannot attain a high enough temperature.
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
Design of Mini Compressorless Solar Powered RefrigeratorGirish Gupta
This project is based on the development of a solar based compressor free mini fridge. This fridge is suitable for cooling purposes meant for small objects and have a relatively small chilling time as compared to the normal refrigeration systems.
Design and Fabrication of Thermo Electric Refrigeratorijtsrd
In the recent years, we have many problems such as energy crises and environment degradation due to increasing CO2 emissions on ozone layer depletion has become the primary concern to both developed and developing countries. Using thermo electric module is going to be one of the most effective, clean and environment friendly system. The main advantage of the thermoelectric refrigerator is no need of any refrigerant and mechanical devices like compressor, prime mover, etc for its operation. Thermo electric refrigerator works on the principle of Peltier effect, when a direct current is passed between two electrically dissimilar materials heat is absorbed or liberated at the junction. The direction of the heat flow depends on the direction of applied electric current. The materials used for the thermo electric refrigerator are Silicon germanium and its alloys. The main objective is to design and fabrication of thermo electric refrigerator with an interior cooling volume of 0.0258m3 Dr. S. Sreenatha Reddy | G. Naveen Kumar | K. Sridhar | M. Sai Siri ""Design and Fabrication of Thermo Electric Refrigerator"" 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/ijtsrd23356.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23356/design-and-fabrication-of-thermo-electric-refrigerator/dr-s-sreenatha-reddy
The following presentation consists of information on limitation of 1st law, introduction to 2nd law, kelvin planks statement, Clausius statement, PPM 2, Carnot cycle, Carnot heat engines, etc
Design and Development of Combined system of air cooler and water chiller sys...SANJAY NEOLIA
The Combined system of air cooler and water chiller is developed for providing better cooling effect than the conventional air cooler. It also provides cold water for drinking purpose comparatively at low cost than refrigerator. It also decreased moisture content of the air coming through desert cooler upto some extent.
“SEMINAR REPORT ON SOLAR ASSISTED VAPOUR ADSORPTION REFRIGERATION SYSTEM”Bhagvat Wadekar
SUMMARY
The range of COP for the Solar VAdRS is 0.2 - 0.7. The development of adsorption system for refrigeration is promising. An overall thermodynamics-based comparison of sorption systems shows that the performance of adsorption systems depends highly on both the adsorption pairs and processes. The technology continues to develop and the cost of producing power with solar thermal adsorption refrigeration is falling. If the costs of fossil fuels, transportation, energy conversion, electricity transmission and system maintenance are taken into account, the cost of energy produced by solar thermal adsorption systems would be much lower than that for conventional refrigeration systems.
The intermittent system has its simplicity and cost effectiveness. However, the main disadvantages such as long adsorption/desorption time have become obstacles for commercial production of the system. Hence, to compete with conventional vapor compression technologies, more efforts should be made in enhancing the COP and SCP. The environmental benefits of this technology and its non-dependence on conventional energy sources makes it highly attractive for further developments and a potential alternative to conventional systems in the future. The future of solar refrigeration and air conditioning seems to be a very good proposition and no doubt will find its place in future industrial applications. The major limiting factor at present is the shape of energy so as to make it available whenever it is required, for example at nights and extended cloudy days when we cannot attain a high enough temperature.
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
Design of Mini Compressorless Solar Powered RefrigeratorGirish Gupta
This project is based on the development of a solar based compressor free mini fridge. This fridge is suitable for cooling purposes meant for small objects and have a relatively small chilling time as compared to the normal refrigeration systems.
Design and Fabrication of Thermo Electric Refrigeratorijtsrd
In the recent years, we have many problems such as energy crises and environment degradation due to increasing CO2 emissions on ozone layer depletion has become the primary concern to both developed and developing countries. Using thermo electric module is going to be one of the most effective, clean and environment friendly system. The main advantage of the thermoelectric refrigerator is no need of any refrigerant and mechanical devices like compressor, prime mover, etc for its operation. Thermo electric refrigerator works on the principle of Peltier effect, when a direct current is passed between two electrically dissimilar materials heat is absorbed or liberated at the junction. The direction of the heat flow depends on the direction of applied electric current. The materials used for the thermo electric refrigerator are Silicon germanium and its alloys. The main objective is to design and fabrication of thermo electric refrigerator with an interior cooling volume of 0.0258m3 Dr. S. Sreenatha Reddy | G. Naveen Kumar | K. Sridhar | M. Sai Siri ""Design and Fabrication of Thermo Electric Refrigerator"" 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/ijtsrd23356.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23356/design-and-fabrication-of-thermo-electric-refrigerator/dr-s-sreenatha-reddy
The following presentation consists of information on limitation of 1st law, introduction to 2nd law, kelvin planks statement, Clausius statement, PPM 2, Carnot cycle, Carnot heat engines, etc
Design and Development of Combined system of air cooler and water chiller sys...SANJAY NEOLIA
The Combined system of air cooler and water chiller is developed for providing better cooling effect than the conventional air cooler. It also provides cold water for drinking purpose comparatively at low cost than refrigerator. It also decreased moisture content of the air coming through desert cooler upto some extent.
It is possible to consider that adsorption systems can be alternative to reduce the CO2 emissions and electricity demand when they driven by waste heat or solar energy. Although, for a broader utilization the researches should continue aiming for improvements in heat transfer,reductions of new adsorbent compounds with enhanced adsorption capacity and improved heat and mass transfer properties.
Experimental Performance Evaluation of R152a to replace R134a in Vapour Compr...IJMER
The performance of heat transfer is one of the most important research areas in the field
of thermal engineering. There are a large number of refrigerants, which are used to transfer heat from
low temperature reservoir to high temperature reservoir by using vapour compression refrigeration
system. There are various obstacles faced in working of different refrigerants due to their environmental
impact (CFC, HCFC), toxicity (NH3), flammability (HC) and high pressure (CO2); which makes them
more hazardous than other working fluids according to safety and environmental issues.
Experimentation is conducted to observe the performance of Hydro-fluorocarbon (HFC) refrigerants
(R134a and R152a) in vapour compression refrigeration. Value of average refrigerating effect for R152a
is about 57% more than that of R134a . Average pressure ratio for R152a was 18.92% higher than that of
R134a. In this result, R152a has emerged as the most energy efficient refrigerant among both the
investigated refrigerants being the one that exhibited the lowest power consumption per ton of
refrigeration with the average value of 13.23% less than that of R134a.The COP of R152a obtain is
higher than R134a by 3.769% .As a result, R152a could be used as a drop-in replacement for R134a in
vapour compression refrigeration system. R152a offers the best desirable environmental requirements;
zero Ozone Depleting Potential (ODP) and 120 Global Warming Potential (GWP).
Create Cool Green Cities! Combat Global Warming!
Contribute for Climate Change issues!
Reduce Energy Consumption in Buildings!
Have Energy Efficient Buildings!
Reduce our City Temp by 2-30C!
Can We Make Life of Common Man Comfortable!
1.1 Layout of thermal power plant - merits and demerits of thermal power plant – pollutants - effects and control – cyclone separator – wet scrubber – electrostatic precipitator – control of No2 and SO2. - fluidised bed combustion.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdf
Domestic refrigerator vs compressor-less refrigerator
1. RAJKIYA ENGINEERING COLLEGE,
AZAMGARH
Department of Mechanical Engineering
2016-17
Seminar based on “Domestic Refrigerator vs Compressorless Refrigerator”
Submitted to-
Department of Mechanical Engineering
Submitted by-
Sachin Kumar
Mechanical Engineering
Roll no.-1373640046
2. CONTENTS-
Introduction
Components of domestic refrigerator
What is refrigerant?
Environmental effects of refrigerant
What is ozone layer?
Ozone layer depletion
Ozone layer depletion(chemical reactions)
Concept of compressorless refrigerator
Components of Solar powered compressorless refrigerator
Advantages of Compressorless refrigerator over domestic refrigerator
Conclusion
References
3. INTRODUCTION
A refrigerator is a popular household appliance that consists of a thermally insulated
compartment & a heat pump that transfer heat from the inside of the fridge to its external
environment.
Refrigerator uses now a days operated by electricity & generation of electricity is the leading
cause of industrial air pollution in the country.
So this project is intended at the development of solar powered compressorless refrigerator.
This refrigerator contains thermoelectric module instead of using compressor & any type of
working fluid.
This refrigerator will be suitable for cooling purposes meant for small objects and will have a
relatively small chilling time as compared to the normal refrigeration systems.
Refrigerator uses in present times having refrigerant consisting of harmful CFCs which are
primarily responsible for Ozone Layer Depletion.
4. Components of Domestic Refrigerator
Working Fluid or Refrigerant
Evaporator
Compressor
Condenser
Expansion valve
5. What is Refrigerant??
Refrigerants are used as working substances in a Refrigeration
systems.
Fluids suitable for refrigeration purposes can be classified into
primary and secondary refrigerants.
Primary refrigerants are those fluids, which are used directly as
working fluids, for example in vapour compression and vapour
absorption refrigeration systems.
These fluids provide refrigeration by undergoing a phase change
process in the evaporator.
Secondary refrigerants are those liquids, which are used for
transporting thermal energy from one location to other.
Secondary refrigerants are also known under the name brines or
antifreezes.
6. Environmental Effects of Refrigerant
Global warming--
Refrigerants directly contributing to global warming when released to the
atmosphere.
Indirect contribution based on the energy consumption of among others
the compressors ( CO2 produced by power stations ).
Causes Ozone Layer Depletion.
7. What is Ozone Layer ??
Ozone is an isotope of oxygen with three atoms instead of normal two. It is
naturally occurring gas which is created by high energy radiation from the Sun.
The greatest concentration of ozone are found from 12 km to 50 km above the
earth forming a layer in the stratosphere which is called the ozone layer.
This layer, which forms a semi-permeable blanket, protects the earth by reducing
the intensity of harmful ultra-violet (UV) radiation from the sun.
Ozone Layer Depletion
In the early70’s,scientists Sherwood Roland and Mario Molina at the University of
California at Irvine were the first to discover the loss of ozone in stratosphere while
investigating the ozone layer from highflying aircraft and spacecraft.
They postulated the theory that exceptionally stable chlorine containing
fluorocarbons could, overtime, migrate to the upper reaches of the atmosphere and
be broken by the intense radiation and release chlorine atoms responsible for
catalytic ozone depletion.
8. Ozone Layer Depletion(chemical reactions)
N0RMAL REACTION
O2 = O + O
O2 + O = O3
But CFC refrigerants leaked during the manufacturing and normal operation or at
the time of servicing or repair, mix with surrounding air and rise to troposphere
and then into stratosphere due to normal wind or storm. The Ultraviolet rays act on
CFC releasing Cl atom, which retards the normal reaction:
RETARDED REACTION
O3 = O2 + O
CCL2F2 = CCLF2 + CL
O3 + CL = CLO + O2
O + CLO = CL + O2
9. Harmful Consequences of Ozone Layer Depletion
For Humans…….Increase in--
• Skin cancer
• Blindness
• Cataracts
Less immunity to--
• Infectious diseases
• Malaria
• Herpes
For plants…….
• Smaller size
• Lower yield
• Increased toxicity
• Altered form
For marine life…….Reduced---
• Plankton
• Juvenile fish
• Larval crabs and shrimps
10. Concept of compressorless refrigerator
TE devices or modules are based on the phenomenon of conversion of thermal
energy (temperature gradient) into electrical energy, referred to as Seebeck
effect and the reverse effect i.e. conversion of electrical energy into thermal
energy or temperature gradient referred to as the Peltier effect.
The solid junction (evaporator surface) becomes cold through absorption of
energy by the electrons as they pass from the low energy level to the high
energy level.
The compressor is replaced by a DC power source that pumps the electrons
from one semiconductor to another one.
A heat sink replaces the conventional condenser fins, discharging the
accumulated heat from the system.
11. Components of Solar Powered Compressorless Refrigerator
Power devices:
• Battery
• Solar Panel
• Charge Controller
Heat dissipating devices:
• Peltier Module
• Fins
• Fan
Wooden Box
12. Advantages of Compressorless Refrigerator over Domestic
Refrigerator
Reduced size and weight compared to the absorption cycle system and
compressor system.
Reliable solid state cooling with no sound, vibrations or electromagnetic
radiation.
Peltier modules can be cascaded to produce temperature differences between the
hot side and the cold side of more than 64°C.
It is possible to produce cooling effect from renewable energy sources without
producing harm gases e.g.(CFCs,CO2).
Less maintenance required because of not having any moving or reciprocating
part.
13. Conclusion
Concluding all, we know that electricity generation is the leading cause of
industrial air and water pollution so replacing the power sources by solar panel
and battery can be helpful in reduction of industrial pollution.
Domestic refrigerator uses refrigerant for cooling but refrigerants are cause of
production of CFCs and harmful gases which is responsible for Ozone layer
depletion by replacing refrigerant from peltier module will reduce effect on
ozone layer.