8-92 Steam enters a turbine at 12 MPa, 550°C, and 60 m/s and leaves at 20 kPa and 130 m/s with a moisture content of 5 percent. The turbine is not adequately insulated and it estimated that heat is lost from the turbine at a rate of 150 kW. The power output of the turbine is 2.5 MW. Assuming the surroundings to be at 25°C, determine a) the reversible power output of the turbine, b) the exergy destroyed within the turbine, and c) the second-law efficiency of the turbine. d) Also, estimate the possible increase in the power output of the turbine if the turbine were perfectly insulated. | |
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