Question:-
A heat, pump for domestic heating operates between a cold system at 0°C and the hot system at 60°C. What is the minimum electric power consumption if the heat rejected is 80000 kJ/hr?
Option (A)
2 kW
Option (B)
3 kW
Option(C)
4 kW
Option(D)
5 kW
Correct Option:
(C)
Question Solution:
(COP)max - {T2 / (T2-T1)} = {333 / (333-273)}= 5.55
Now : (COP)max = (Desired effect / Min power input)
\ Pmin = {80000 / (3600 x 5.55)} = 4kW
question-answer-faq-9442