Question

A condenser of a refrigeration system rejects heat at a rate of 120 kW, while is compressor consumes a power of 30 kW. The coefficient of performance of the system would be

• A. $4$
• B. $1/3$
• C. $3$
• D. $1/4$

Answer 1

The correct option is C $3$


$Q_1=120kW$
$W=30kW$
also $W=Q_1-Q_2$
$\therefore$ $30=120-Q_2$ or $Q_2=120-30=90kW$
Coefficient of performance, $(COP{)}_R=\frac{Q_2}{W}=\frac{90}{30}$=3