K10947 Vikas rac
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This document discusses the process of vapor compression refrigeration. It describes the key components of a vapor compression system including the evaporator, compressor, condenser, and expansion valve. The refrigeration cycle is explained where refrigerant in the evaporator absorbs heat and changes from liquid to gas. The gas is compressed in the compressor and condensed in the condenser before passing through the expansion valve back to the evaporator. The document provides details on each component and how they work together in the refrigeration process.
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K10947 Vikas rac
- 1. Btech Mech 6th SEM Major Assignment Exergy Analysis of Vapor Compression Cycle Vikas Mishra K10947 Btech Mech 6th Sem
- 2. Exergy • The term exergy maens the maximum useful work possilble during a process that brings the system into equilibrium with a heat reservoir. When the surroundings are the reservoir, exergy is the potential of a system to cause a change as it achieves equilibrium with its environment.
- 3. Refrigeration • Refrigeration : The term refrigeration may be defined as the process of removing heat from a substance under controlled conditions. • It also includes the process of reducing heat & maintaining the temp. of a body below the general temp. of its surroundings.
- 4. Vapour Compression System Low Pressure Side High Pressure Side Liquid receiver Expansion valve Compressor Evaporator Liquid Condenser Heat in Heat out Hot Gas Gas 4 numbers principle components : (1)Evaporator (2)Compressor (3)Condenser (4)Expansion Valve
- 5. Vapour Compression Refrigeration • Highly compressed fluids tend to get colder when allowed to expand • If pressure high enough • Compressed air hotter than source of cooling • Expanded gas cooler than desired cold temperature
- 6. Vapour Compression Refrigeration Two advantages • Lot of heat can be removed (lot of thermal energy to change liquid to vapour) • Heat transfer rate remains high (temperature of working fluid much lower than what is being cooled)
- 7. Vapour Compression Refrigeration Refrigeration cycle Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
- 8. Vapour Compression Refrigeration Refrigeration cycle Low pressure liquid refrigerant in evaporator absorbs heat and changes to a gas Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
- 9. 1) The evaporator coils are located in the compartment to be cooled. 2) The low pressure liquid refrigerant ,after passing through the expansion valve, expands. 3) Takes in heat from the surrounding and evaporates. 4) The gas is then sucked up by the compressor. 5) The amount of heat added to the liquid to make it saturated and change states is called Super Heat. EVAPORATOR:
- 10. Vapour Compression Refrigeration The superheated vapour enters the compressor where its pressure is raised Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
- 11. The Compressor • The compressor is the heart of the system. The compressor does just what it’s name is. It compresses the low pressure refrigerant vapor from the evaporator and compresses it into a high pressure vapor. • The inlet to the compressor is called the Suction Line. It brings the low pressure vapor into the compressor. • After the compressor compresses the refrigerant into a high pressure Vapor, it removes it to the outlet called the Discharge Line.
- 12. Vapour Compression Refrigeration The high pressure superheated gas is cooled in several stages in the condenser Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
- 13. The Condenser The Discharge Line leaves the compressor and runs to the inlet of the condenser. Because the refrigerant was compressed, it is a hot high pressure vapor (as pressure goes up – temperature goes up). The hot vapor enters the condenser and starts to flow through the tubes. Since the air is cooler than the refrigerant, heat jumps from the tubing to the cooler air (energy goes from hot to cold – latent heat). As the heat is removed from the refrigerant, it reaches it’s saturated temperature and starts to boil (change states), into a high pressure liquid. The high pressure liquid leaves the condenser through the liquid line and travels to the metering device. Sometimes running through a filter dryer first, to remove any dirt or foreign particles.
- 14. Vapour Compression Refrigeration Refrigeration cycle Liquid passes through expansion device, which reduces its pressure and controls the flow into the evaporator Condenser Evaporator High Pressure Side Low Pressure Side Compressor Expansion Device 1 2 3 4
- 15. Thermal expansion Valves • EXPANSION: 1) The expansion valve acting as a regulating valve, limits the amount of refrigerant flowing through. 2) Resulting in reduction of pressure of the liquid and expansion takes place.
- 16. Vapour Compression Refrigeration Type of refrigerant • Refrigerant determined by the required cooling temperature • Chlorinated fluorocarbons (CFCs) or freons: R-11, R- 12, R-21, R-22 and R-502