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ME326_HW8_26Oct2011

# ME326_HW8_26Oct2011 - ME 326-Homework Assignment#8 Due 26...

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Due: 26 October 2011 Topic: Heat Engines, Refrigerators, Heat Pumps Text: Chapter 8 Problem #1: A coal-fired power plant produces 300 MW of electrical power and has a thermal efficiency of 34%. Coal has a heating value (amount of heat generated per unit mass of coal burned) of 15 MJ/kg. For every kg of coal that is burned, 2.93 kg of carbon dioxide (CO 2 ) are produced. For this power plant determine: a) the rate of heat input (MW), b) the rate of coal consumption (kg/s), c) the rate of carbon dioxide production (kg/s). Problem #2: The power plant described in problem #1 obtains heat from a coal furnace at a temperature of 3500 °F, and rejects waste heat to a lake at 40 °F. Considering the temperature of these thermal reservoirs, a) what is the maximum possible efficiency the power plant could achieve? Assuming power plant is modified so it achieves the maximum possible efficiency and that the net power output remains 300MW, re-compute b) the rate of coal consumption (kg/s), c) the rate of carbon dioxide production (kg/s). Q

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ME326_HW8_26Oct2011 - ME 326-Homework Assignment#8 Due 26...

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