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Unformatted text preview: r an adiabatic gas turbine at
1540°F and 120 psia and leave at 60 psia with a low velocity.
Treating the combustion gases as air and assuming an isentropic efficiency of 86 percent, determine the work output of
the turbine. Answer: 75.2 Btu/lbm 7–106E Air enters an adiabatic nozzle at 60 psia and 1020°F
with low velocity and exits at 800 ft/s. If the isentropic efficiency of the nozzle is 90 percent, determine the exit temperature and pressure of the air. 7–100 Refrigerant-134a enters an adiabatic compressor as saturated vapor at 120 kPa at a rate of
0.3 m3/min and exits at 1-MPa pressure. If the isentropic efficiency of the compressor is 80 percent, determine (a) the temperature of the refrigerant at the exit of the compressor and
(b) the power input, in kW. Also, show the process on a T-s
diagram with respect to saturation lines.
1 MPa R-134a
COMPRESSOR 120 kPa
Sat. vapor FIGURE P7–100
7–101 Reconsider Prob. 7–100. Using EES (or other)
software, redo the problem by including the ef- 7–107E Reconsider Prob. 7–106E. Usin...
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This document was uploaded on 11/28/2012.
- Spring '09