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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.
comp. 98 kPa
295 K 12.5 MPa
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.
- Spring '09