Question

What is the theoretical variation of COP of a carnot heat pump used for heating?

• A. $0to1$
• B. $0to\infty$
• C. $1to\infty$
• D. $-\infty to\infty$

Answer 1

The correct option is C $1to\infty$

$CO{P}_{H.P}=\frac{T_1}{T_1-T_2}$




The lowest possible value of lower temperature from which $Q_2$ heat is extracted is 0 $[i.e.T_2=0]$.

The highest possible value of lower temperature is $T_1$ (i.e, Surrounding temperature). So, COP of heat pump will vary 1 to $\infty$