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← ScienceWhich 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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