Chemical Engineering Thermodynamics
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

No change in the value of COP
Enhanced COP
Increased or decreased COP ; depending upon the type of refrigerant
Decreased COP

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Chemical Engineering Thermodynamics
Which of the following is an undesirable characteristics of a refrigerant ?

Its vapor pressure at the condenser temperature should be very high
It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
None of these
It should be non-explosive

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