50 kpa sat vapor figure p7130 answers a 3704c b 00517

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Unformatted text preview: stant. Determine (a) the amount of heat transfer and (b) the total entropy generation for this process. 7–134E An iron block of unknown mass at 185°F is dropped into an insulated tank that contains 0.8 ft3 of water at 70°F. At the same time, a paddle wheel driven by a 200-W motor is activated to stir the water. Thermal equilibrium is established after 10 min with a final temperature of 75°F. Determine the mass of the iron block and the entropy generated during this process. 7–135E Air enters a compressor at ambient conditions of 15 psia and 60°F with a low velocity and exits at 150 psia, 620°F, and 350 ft/s. The compressor is cooled by the ambient air at 60°F at a rate of 1500 Btu/min. The power input to the compressor is 400 hp. Determine (a) the mass flow rate of air and (b) the rate of entropy generation. STEAM TURBINE 4 MW 7–136 Steam enters an adiabatic nozzle at 3 MPa and 400°C with a velocity of 70 m/s and exits at 2 MPa and 320 m/s. If the nozzle has an inlet area of 7 cm2, determine (a) the exit temperature and (b) the rate of entropy generation for this process. 50...
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This document was uploaded on 11/28/2012.

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