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

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Chemical Engineering Thermodynamics
A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of

Temperature, pressure and liquid composition xi only
Temperature and pressure only
Temperature, pressure, liquid composition xi and vapour composition yi
Temperature only

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