An air-conditioner operating at steady state maintains a house at a constant temperature of 20°C. The
house gains energy by heat transfer at the rate of 20,000 kJ/hr from the outside environment at 40°C and
by energy generated from occupants, lights, and appliances at the rate of 8,000 kJ/hr. Coefficient of
performance of the air-conditioner is 3.75.
(a) Calculate the power input for the air-conditioner, in kW.
(b) Find the maximum coefficient of performance of the air-conditioner.
