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Problem 9-11
| Three high pressure turbines have been submitted for testing. Each operates with an inlet state of 1000 oF, 3500 psia steam. Turbine X has an exit state of 1000 psia at 660 oF and a heat loss of 7 Btu/lbm; turbine Y's exit state is 1000 psia at 635 oF with a heat loss of 12 Btu/lbm; and turbine Z's heat loss is 2 Btu/lbm with an exit state of 1000 psia at 680 oF. Summarize the test data, calculate the work output and isentropic efficiency of each turbine, and give a purchase recommendation. |
| Wx= 119.9 Btu/lbm | nx= 80.7% |
| Wy= 133.8 Btu/lbm | ny= 93.1% |
| Wz= 109.7 Btu/lbm | nz= 75.6% |
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Problem 9-53
| Air is compressed from 1 atm to 300 psia. Determine the work required for an isentropic compressor and for a highly cooled compressor in which the air undergoes an isothermal process. What is the isothermal efficiency of the isentropic compressor (nt = Wt/W)? The inlet temperature is 60 oF. |
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