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Steam enters a turbine operating at steady state at a pressure of 1000 lbf/in2 and a temperature of 1100°F, and exits at a pressure of 4.0 lbf/in2 as a saturated liquid-vapor mixture with a quality of 0.96. Stray heat transfer from the turbine to the surroundings occurs. The ambient temperature is 90°F. Measurements indicate that the magnitude of the rate of the stray heat transfer is 3% of the turbine power. The mass flow rate of water through the turbine is 10 lbm/s.
(a) Calculate the turbine power (Btu/s).
(b) For an enlarged control volume that includes the turbine and enough of the surroundings so that the boundary temperature is 90°F, calculate the rate of entropy production (Btu/s-°R).
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