Which effect reduces heat pump efficiency during defrost?

💡 Explanation

The efficiency drops because the heat pump reverses to melt ice. Latent heat phase transition requires energy input to change ice to water at a constant temperature; therefore the internal coil cools further, rather than alternatives that consider only sensible heating.

• Which outcome occurs when cross-polarized filters misalign angularly?
• Which outcome is most likely when a refrigeration cycle compressor experiences superheated vapor return?
• Which consequence results when the Carnot efficiency limit is reached during a refrigeration cycle?
• Which outcome occurs when thermal gradients increase vacancy diffusion within a crystal lattice?
• Which phenomenon causes decreased catalytic activity in zeolites with high aluminum content used in catalytic cracking?
• Which effect commonly arises when placing a magnetic field near a superconducting quantum interference device (SQUID)?