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

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

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Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The chemical potential of each component should be same in the two phases
The concentration of each component should be same in the two phases
The temperature of each phase should be same
The pressure should be same in the two phases

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