Find the second-law efficiencies for both stages of turbine

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1. The condenser in a refrigerator receives R-134a at 700 kPa, 50?C and it exits as saturated liquid at 25?C. The flow rate is 0.1 kg/s, and the condenser has air flowing in at ambient 15?C and leaving at 35?C. Find the minimum flow rate of air and the heat exchanger second-law efficiency.

2. A flow of steam at 10 MPa, 550?C goes through a two-stage turbine. The pressure between the stages is 2 MPa, and the second stage has an exit at 50 kPa. Assume both stages have an isentropic efficiency of 85%. Find the second-law efficiencies for both stages of the turbine.

Reference no: EM131249883

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