A Refrigerator is a device which operating in a cyclic process to maintain the temperature of a cold body (refrigerated space) at a temperature lowers than the temperature of surrounding.

Main Components of a Refrigerator:
  • Evaporator: It contains work fluid at lower temperature than environment. Heat is extracted from ground, air, or water. Pressure is low, so the work fluid evaporates.
  • Compressor: Compressor brings gas to higher pressure, the temperature rises. 
  • Condenser: Gas temperature is higher than fluid temperature of heating system. Excess heat is transferred to fluid. The gas cools and condenses. 
  • Expansion Valve: Expansion Valve causes pressure reduction, the temperature drops, and the cycle begins again
Components of a Refrigerator

Coefficient of Performance (COP):
The performance of an Air conditioner or Refrigerator is judged by how much heat transfer Qc occurs into the warm space compared with how much work input W is required.

Coefficient of Performance (COP)


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