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Which limit is reached when isothermal expansion concludes during a refrigeration cycle?

A)Maximum refrigerant vapor superheat
B)Minimal compressor discharge pressure
C)Complete refrigerant liquid evaporation
D)Maximum subcooling of condensed liquid

💡 Explanation

Complete evaporation maximizes the refrigerant's ability to absorb heat through phase change in the evaporator; this occurs because latent heat transfer, rather than specific heat, drives thermal efficiency; therefore, maximizing evaporation rather than superheating maximizes energy extraction.

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