Which mechanism limits coefficient of performance (COP) of a vapor-compression heat pump at high temperature lift?

💡 Explanation

At high temperature lifts, the required vapor pressure ratio increases, leading to decreased latent heat absorbed per unit mass because the refrigerant's thermodynamic properties shift closer to the critical point, consequently lowering efficiency. Therefore, decreased latent heat limits COP, rather than other performance enhancers which require increased heat transfer.

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