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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.
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Plot each of the quantities calculated in Problem 8.2 versus condenser pressure ranging from 6 kPa to 0.1 MPa. Discuss.
Plot each of the quantities calculated in Problem 8.2 versus steam generator pressure ranging from 4 MPa to 24 MPa. Maintain the turbine inlet temperature at 480C. Discuss.
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