Which outcome rapidly increases total entropy when refrigerant undergoes a phase transition in a heat pump?

A)Increased volumetric flow rate

B)Decreased compressor work input

C)Isothermal heat transfer at evaporator✓

D)Reduced temperature gradients

💡 Explanation

When the refrigerant boils in the evaporator, isothermal heat transfer occurs because a large amount of heat is absorbed at a constant temperature to change phase, thus maximizing entropy gain. Therefore heat transfer at evaporator maximizes entropy increase, rather than affecting flow, work, or temperature via alternative means only.

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Which outcome rapidly increases total entropy when refrigerant undergoes a phase transition in a heat pump?

💡 Explanation

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