Heat is removed from a cooled space by an Air Conditioner that operates accordin

Question

Heat is removed from a cooled space by an Air Conditioner that operates according to the vapor compressions refrigeration cycle shown in the figure below. R-134a is the refrigerant flowing in the cycle. The conditioned space gains heat from different sources at a rate of 10 kW. The pressure throughout the evaporator is 120 kpa. R-134a at the exit of the evaporator is saturated vapor. The compressor raises the pressure to 1 Mpa. The phase at the exit of the condenser is saturated liquid. Assume constant pressure throughout the condenser. Furthermore, assume the compressor to be adiabatic and reversible. Determine: The specific enthalpy of R-134a at all points (1, 2, 3, and 4) in the cycle. The mass flow rate of R-134a in the cycle. The power input to the compressor (in kJ/s) The rate of heat rejection in the condenser. The COP of the refrigeration cycle. Show all cycle processes on a T-s diagram. The maximum COP that theoretically might be attained by an Air conditioner that operates between two temperatures TH = 45 degree C and TL = 22 degree C.

Explanation / Answer

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