Question

The hot water needs of an office are met by heating tab water by a heat pump from 16 C to 50 C at an average rate of 0.2 kg/min. If the COP of this heat pump is 2.8, the required power input is: (a) 1.33 kW (d) 10.2 kW (b) 0.17 kW (c) 0.041 kW

Answer 1

option B

Step-by-step explanation:

given,

heating tap water from 16° C to 50° C

at the average rate of 0.2 kg/min

the COP of this heat pump is 2.8

power output = ?

`COP = (Q_H)/(W_(in))\\W_(in) = (Q_H)/(COP)\\W_(in) = ((0.2)/(60)* 4.18* (50-16))/(2.8)\\W_(in) = 0.169`

the required power input is 0.169 kW or 0.17 kW

hence, the correct answer is option B