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ME300HW4Solution

# ME300HW4Solution - Problem 7.103 A steam turbine operating...

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Problem 7.103 A steam turbine operating at steady state develops 9750 hp. The turbine receives 100,000 pounds of steam per hour at 400 lbf/in. 2 and 600°F. At a point in the turbine where the pressure is 60 lbf/in. 2 and the temperature is 300°F, steam is bled off at the rate of 25,000 lb/h. The remaining steam continues to expand through the turbine, exiting at 2 lbf/in. 2 and 90% quality. (a) Determine the rate of heat transfer between the turbine and its surroundings, in Btu/h. (b) Devise and evaluate an exergetic efficiency for the turbine. Kinetic and potential energy effects can be ignored. Let T 0 = 77°F, p 0 = 1 atm. Known: Operating data are provided for a steam turbine at steady state from which steam is bled off at a specified state and flow rate. Find: (a) Determine the rate of heat transfer between the turbine and its surroundings. (b) Devise and evaluate an exergetic efficiency. Schematic and Known Data: Engineering Model: (1) The control volume shown in the accompanying figure operates at steady state. (2) Kinetic and potential energy effects can be neglected. (3) For the environment, T 0 = 77°F, p 0 = 1 atm.

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