Four heat pumps are proposed for home heating

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

Four heat pumps are proposed for home heating. Their operating temperatures and advertised COPs are: A: TH=300 K,  TC=280 K,  COP=12T_H = 300\,\text{K},\;T_C = 280\,\text{K},\;\text{COP}=12 B: TH=310 K,  TC=280 K,  COP=8T_H = 310\,\text{K},\;T_C = 280\,\text{K},\;\text{COP}=8 C: TH=290 K,  TC=270 K,  COP=10T_H = 290\,\text{K},\;T_C = 270\,\text{K},\;\text{COP}=10 D: TH=305 K,  TC=290 K,  COP=20T_H = 305\,\text{K},\;T_C = 290\,\text{K},\;\text{COP}=20 Which heat pump operates closest to the ideal (Carnot) limit? (a) B (b) D (c) A (d) C

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