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← TechnologyWhich outcome diminishes residential heat pump coefficient of performance (COP) as temperatures drop significantly below freezing?
A)Increased thermal losses through the insulation
B)Decreased refrigerant mass flow rate
C)Icing of the outdoor coil✓
D)Increased compressor motor winding resistance
💡 Explanation
When outdoor temp drops, icing of the outdoor coil occurs because moisture in the air freezes on the cold surface, reducing airflow and insulating the coil. Therefore COP diminishes due to reduced heat exchange, rather than increased thermal losses, decreased flow, or increased resistance which are secondary or less direct influences.
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