Answer
$-22^{\circ}C$
Work Step by Step
The ideal coefficient of performance is given in equation 15–6c. Make sure to measure temperatures in kelvins.
$$COP_{ideal}=\frac{T_L}{T_H-T_L}$$
$$T_L=T_H\frac{COP}{1+COP}$$
$$= (32+273)K\frac{4.6}{5.6}=251K=-22^{\circ}C$$
