The vapor compression system is a reverse Rankine cycle. Mostly, a vapor compression refrigeration system (VCRS) is used for providing cooling in practical life. The VCRS uses a refrigerant where the phase transfer of refrigerant takes place and it undergoes a cyclic process to provide cooling. All air-conditioning works on the vapor compression refrigeration system. All VCRS use four important components: compressor, condenser, expansion valve, and evaporator.
At first, the refrigerant takes in heat from the cooling space and then enters a compressor where the pressure and temperature of the refrigerant are increased. After that, it enters into a condenser chamber when it releases heat into the surrounding at constant pressure. After expanding through the expansion valve, it enters into the evaporator again. A vapor compression refrigeration system is shown below.
How to improve the efficiency of the VCRS:
1. Decrease the pressure of the condenser. On decreasing the pressure of the condenser, the work input to the compressor decreases which increases the COP.
2. Increase the evaporator pressure. On increasing the evaporator pressure, the work input to the compressor decreases which decreases the cooling effect but the ratio of the cooling to work input increases.
COP of reverse Brayton cycle:
This cycle is also used to provide cooling. This cycle is mostly used to provide cooling in jet aircraft. Air is used as the working fluid. This is also used in various industries to maintain a fixed temperature of a cold body. The components of the reverse Brayton cycle are shown below:
The COP of reverse Brayton cycle is given as:
Difference between the COP and efficiency:
The COP is used for energy transferring devices and efficiency is used for energy converting devices. A heat pump and refrigerator are energy transferring devices whereas heat engines are energy converting devices.
The value of COP can be greater than 1 or less than 1, but the value of efficiency cannot be greater than 1. If the efficiency of an engine is greater than 1 it will violate the first law of thermodynamics.
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