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