Heat is transferred from the first body to the heat

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Unformatted text preview: eam enters the turbine at 12.5 MPa and 500°C at a rate of 25 kg/s and exits at 10 kPa and a quality of 0.92. Air enters the compressor at 98 kPa and 295 K at a rate of 10 kg/s and exits at 1 MPa and 620 K. Determine the net power delivered to the generator by the turbine and the rate of entropy generation within the turbine and the compressor during this process. 1 MPa 620 K Air comp. 98 kPa 295 K 12.5 MPa 500°C Steam turbine 10 kPa FIGURE P7–149 7–150 Reconsider Prob. 7–149. Using EES (or other) software, determine the isentropic efficiencies for the compressor and turbine. Then use EES to study how varying the compressor efficiency over the range 0.6 to 0.8 and the turbine efficiency over the range 0.7 to 0.95 affect the net work for the cycle and the entropy generated for the process. Plot the net work as a function of the compressor efficiency for turbine efficiencies of 0.7, 0.8, and 0.9, and discuss your results. 7–151 Consider two bodies of identical mass m and specific heat C used as thermal reservoirs (source and sink) for a heat engine. The first body is initially at an absolute temperature T1 while the second one is at a lower absolute temperature T2. Heat is transferred from the first body to the heat engine, which rejects the waste heat to the second body. The process continues u...
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This document was uploaded on 11/28/2012.

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