An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20C when the outside temperature is 5C. Saturated vapor at 2.4 bar leaves the evaporator, and saturated liquid at 8 bar leaves the condenser. Calculate

(a) the power input to the compressor, in kW.

(b) the coefficient of performance.

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(c) the coefficient of performance of a Carnot heat pump cycle operating between thermal reservoirs at 20 and 5C.

A vapor-compression heat pump system uses Refrigerant 134a as the working fluid. The refrigerant enters the compressor at 2.4 bar, 0C, with a volumetric flow rate of 0.6 m3 /min. Compression is adiabatic to 9 bar, 60C, and saturated liquid exits the condenser at 9 bar. Determine

(a) the power input to the compressor, in kW.

(b) the heating capacity of the system, in kW and tons.

(c) the coefficient of performance.

(d) the isentropic compressor efficiency.

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