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

Same COP
Decreased COP
Increased or decreased COP ; depending upon the type of refrigerant
Increased COP

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Chemical Engineering Thermodynamics
It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is independent of path
Work alone can not bring out such a change of state
The amount of work needed is path dependent
More information is needed to conclude anything about the path dependence or otherwise of the work needed

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