Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

Decrease
Remain unaffected
May increase or decrease depending on the type of refrigerant used
Increase

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Refrigeration and Air Conditioning
A good refrigerant should have

High latent heat of vaporisation and low freezing point
High operating pressures and low freezing point
High specific volume and high latent heat of vaporisation
Low C.O.P. and low freezing point

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