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Refrigerant 134a enters the compressor of a vaporcompression heat pump at 30 lbf/in.2 , 20F and is compressed adiabatically to 200 lbf/in.2 , 160F. Liquid enters the expansion valve at 200 lbf/in.2 , 120F. At the valve exit, the pressure is 30 lbf/in.2 Determine

(a) the isentropic compressor efficiency.

(b) the coefficient of performance.

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