Simple Vapour Compression Cycle

Simple Vapour Compression Cycle

 

Fig.- Simple Vapour Compression Cycle

A fundamental refrigeration cycle used in air conditioning and refrigeration systems is the Simple Vapour Compression Cycle (VCC). Compressor, condenser, expansion valve, and evaporator make up its four primary parts.

 

1.     Compressor: The compressor is used to raise the temperature and pressure of low-pressure refrigerant vapour that is drawn in from the evaporator. The refrigerant's energy level is increased by this compression.

2.     Condenser: The compressor sends high-pressure, high-temperature refrigerant vapour into the condenser. Here, heat exchange between the refrigerant and the environment (air or water) results in the release of heat. The outcome is that the refrigerant condenses into a liquid under high pressure.

3.     Expansion Valve: The liquid refrigerant is then forced through a throttle valve or expansion valve at high pressure. The refrigerant expands quickly as a result of the valve's fast pressure reduction. The refrigerant's temperature and pressure are dramatically reduced as a result of this expansion.

4.     Evaporator: The liquid refrigerant enters the evaporator at low pressure and low temperature. The refrigerant in the evaporator evaporates into a low-pressure vapour as a result of heat absorption from the area or item that has to be cooled. The surrounding region or item cools as a result of the evaporation process.

 

The cycle is then repeated with the return of the vaporised refrigerant to the compressor. In order to provide cooling or refrigeration, the VCC continually takes heat from one spot (evaporator) and releases it to another (condenser).

While this explanation offers a condensed summary of the Simple Vapour Compression Cycle, it's crucial to keep in mind that real-world implementations frequently contain extra parts and complications to maximise efficiency, such as expansion valves, accumulators, and fans.

 

The COP of VCC cycle is calculated as –

Fig. P-V Diagram

From PV diagram