k10998 (wasique ahmad )Rac
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This document summarizes the vapor compression refrigeration cycle. It describes the key components of the cycle including the compressor, condenser, expansion valve, and evaporator. It provides equations to calculate the refrigeration effect, work input, and coefficient of performance. The document discusses how changes in condenser pressure and superheating affect the refrigeration effect, work input, and COP. It lists advantages like high COP and ability to remove a lot of heat. Demerits include high initial cost, potential leakage, and toxicity of some refrigerants. The conclusion is that vapor compression cycles use high-grade energy and are suitable for small spaces like shops due to their size.
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FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
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Like Us - https://www.facebook.com/FellowBuddycom
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Refrigeration Systems.pptx
This document describes refrigeration systems and the vapor compression refrigeration cycle. It discusses that refrigeration systems maintain a cold region below its surroundings' temperature. The vapor compression cycle involves: 1) evaporation and cooling, 2) compression, 3) condensation and warming, 4) expansion. Actual systems have lower efficiency than ideal Carnot cycles due to irreversible heat transfer. Common refrigerants are discussed along with their global warming potentials. An example problem calculates the coefficient of performance for an ideal and actual refrigeration system.
Vapour compression refrigeration system
The document discusses the basic processes of a vapor compression refrigeration cycle including: evaporation of refrigerant absorbing heat from the refrigerated space; compression of the vapor requiring work input; condensation of the vapor releasing heat to the surroundings; and expansion of the liquid refrigerant. It also discusses engineering models and assumptions made in analyzing the cycle components, refrigeration capacity, coefficient of performance, use of pressure-enthalpy diagrams, multistage compression systems, flash gas removal, cascade systems, and psychrometric processes.
7_Refrigeration_Cycle_UNIT_2_REFRIGERATI.pdf
This document discusses refrigeration cycles. It begins by introducing refrigeration and defining it as the process of removing heat from a substance under controlled conditions. It then discusses the objectives of understanding refrigeration cycles. The main refrigeration cycle discussed is the vapor compression cycle, which uses a refrigerant circulated through a compressor, condenser, expansion valve, and evaporator. It explains the processes that occur at each component, including compression, condensation, expansion, and evaporation. Graphs of temperature-entropy and pressure-enthalpy diagrams are provided to illustrate the vapor compression cycle. The document also discusses how changes in suction pressure, discharge pressure, and evaporator pressure affect the refrigeration cycle and coefficient of performance.
7 Refrigeration Cycle UNIT 2 REFRIGERATION CYCLE
The document discusses refrigeration cycles. It begins by defining refrigeration as removing heat from a substance under controlled conditions to reduce and maintain its temperature below surroundings. A refrigeration cycle works by pumping heat from a lower to higher temperature body, requiring external work per the second law of thermodynamics. The document then focuses on describing the vapor compression refrigeration cycle, including the compressor, condenser, expansion valve, and evaporator components and processes. It analyzes the theoretical cycle on temperature-entropy and pressure-enthalpy diagrams and discusses effects of varying evaporator pressure, condenser pressure, suction vapor superheat, and liquid subcooling on the cycle's coefficient of performance.
Basics of Vapor Compression.ppt
The document summarizes the vapor compression refrigeration cycle. It consists of four main processes: (1) evaporation of the refrigerant in the evaporator, (2) compression of the vapor in the compressor, (3) condensation of the vapor in the condenser, and (4) expansion of the liquid in the expansion valve back to the evaporator. The coefficient of performance (COP) measures the efficiency of the cycle and is affected by irreversibilities. Common refrigerants include CFCs, HCFCs, HFCs and natural refrigerants like CO2 and ammonia, with considerations for performance, safety, and environmental impact.
17-RAC-Akash-Langde.ppt
The document describes the vapor compression refrigeration cycle. It consists of four main processes: (1) evaporation of the refrigerant in the evaporator, (2) compression of the vapor in the compressor, (3) condensation of the vapor in the condenser, and (4) expansion of the liquid in the expansion valve back to the evaporator. The coefficient of performance (COP) measures the efficiency of the cycle and is affected by irreversibilities in the actual cycle compared to the ideal Carnot cycle. Refrigerant selection considers factors like performance, safety, and environmental impact including effects on ozone depletion and global warming.
RAC-Akash-Langde..ppt
The document summarizes the vapor compression refrigeration cycle. It consists of four main processes: (1) evaporation in the evaporator, (2) compression in the compressor, (3) condensation in the condenser, and (4) expansion in the expansion valve. Heat is transferred from the refrigerated space during evaporation and to the surroundings during condensation. The coefficient of performance (COP) measures the efficiency of the cycle and is lower for actual cycles compared to the theoretical Carnot COP due to irreversibilities. Refrigerant selection considers performance, safety, environmental impact, and global warming potential.
Refrigeration Senator Libya
The vapor compression refrigeration cycle is commonly used to transfer heat from a low temperature medium to a high temperature medium. It involves four main processes: (1) compression of a refrigerant vapor, (2) heat rejection in a condenser, (3) expansion of the refrigerant through a throttle valve, and (4) heat absorption in an evaporator. The coefficient of performance (COP) is used to measure the efficiency of refrigerators and heat pumps. Actual vapor compression cycles are less efficient than the ideal Carnot cycle due to irreversibilities.
Refrigiration and air conditioning by abhishek singh
deep details about the Refrigiration and air conditioning made by abhishek singh for the new comers engineers
4. Refrigeration.pptx
Refrigeration and heat pumps use reversed heat engine cycles to transfer heat from low to high temperature regions. A refrigerator uses work to absorb heat from its surroundings (Q1), while a heat pump uses work to reject heat (Q2). The coefficient of performance (COP) indicates efficiency. An ideal Carnot cycle achieves the highest COP, which is a function of temperature difference. Practical vapor-compression refrigeration cycles use phase change of refrigerants to improve heat transfer efficiency compared to gas cycles. Refrigerant selection depends on properties like latent heat and safety.
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Refrigiration and air conditioning by abhishek singh
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IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
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k10998 (wasique ahmad )Rac
- 1. CAREER POINT UNIVE MAJOR ASSIGNMENT Vapours Compression Refrigeration Cycle
- 2. Table of Content Refrigeration Refrigerant Vapour compression cycle Effect Cop Merit Demerit Advantage By studying of research paper
- 3. Refrigeration Refrigeration is the process of producing of lower temperature compare to the surrounding temperature to maintain the lower temperature. For example : vapour compression cycle, vapour absorption cycle, gas refrigeration cycle.
- 4. Refrigerant Refrigerant are the substance which are used for producing lower temperature .for example ammonia,water,air,R-12,R-22,R-134. Refrigeration effect: It is the amount of heat which is to be extracted from the storage space in order to maintain lower temperature is called desire effect of refrigeration system.
- 5. Vapour compression Refrigeration System: There are four component in Vapour compression cycle. 1. Compressor:- Compresses the refrigerant to high pressure and temperature from low pressure and temperature. 2. Condenser:- The latent heat of refrigerant is removed by circulating water or atmospheric air. 3. Expansion Valve:- In the throttle valve where the pressure is reduced at a controlled rate. 4. Evaporator:- A liquid-Vapour mixture refrigerant then enters the evaporator at low pressure where the latent heat of evaporation is converted into vapour and the cycle repeats.
- 7. Apply Steady flow energy equation ( Neglect K.E & P.E changes) 1. Compressor: Q1-2 + C1 2/2 + Z 1 + h1 = W1-2 + C2 2/2 + Z 2+ h2 W1-2 = - ( h2 – h1) 2. Condenser: Q2-3 + C2 2/2 + Z 2 + h2 = W2-3 + C3 2/2 + Z 3+ h3 Q2-3 = - (h2 - h3) 3. Throttle Valve: Q3-4 + C3 2/2 + Z 3 + h3 = W3-4 + C4 2/2 + Z 4+ h4 h3 = h4 (Isenthalpic process) 4. Evaporator: Q4-1 + C4 2/2 + Z 4 + h4 = W4-1 + C1 2/2 + Z 1+ h1 Q4-1 + h4 = h1 Q4-1 = h1 – h4
- 8. Co-efficient of Performance: It is the ratio of net refrigerating effect to the work required to produce that effect. Co-efficient of performance = Refrigerating effect/ Work input = ( h1 – h4 ) / (h2 – h1)
- 10. Effect Reduction in Refrigeration effects Increase in work input Decrease in COP Decrease in volumetric efficiency due to increase in pressure ratio.
- 11. RE= h1-h4 Win=h2-h1 COP= RE/Win Case 2:- Increase in condenser pressure
- 12. Effect Reduction in Refrigeration effects Increase in work input Decrease in COP Decrease in volumetric efficiency due to increase in pressure ratio.
- 13. RE= h1-h4 Win= COP= RE/Win Case 3:- Superheating
- 14. Effect Increase in Refrigeration effect Increase in work input due to temperature at the inlet to compressor increase. COP may increase or decrease depending on the refrigerant. In case of R- 12 superheating result in increase in COP where as in case of NH3 superheating results in decrease in COP.
- 15. MERIT Cop is high. Size of evaporator is small. Evaporator temperature adjustment is small. Easily available . It is used for small places like shops.
- 16. Demerit Initial cost is high. Inflammability Leakage Toxicity
- 17. Advantages Lot of heat can be removed (lot of thermal energy to change liquid to vapors). heat transfer rate become high(temperature of working fluid much lower than what is being cooled).
- 18. Studying by research paper By getting result of R134a is a best refrigerant among all refrigerant. Because COP is lower as compare to other refrigerant That’s why R-134 is a eco-friendly in nature .
- 19. Conclusion At finally we conclude that v c cycle is work on high grade energy and it is where used there is small space It is used for making environment cool