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Transcript
Thermodynamics 1 (MEP 261) Quiz 4 ( 20 Marks): Model Answer Class ZA, Date: December 17, 2011 Name: University ID: 6–18 1) A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat losses to the surrounding air from the steam as it passes through the pipes and other components are estimated to be about 8 GJ/h. If the waste heat is transferred to the cooling water at a rate of 145 GJ/h, determine (a) net power output and (b) the thermal efficiency of this power plant. Answers: (a) 35.3 MW, (b) 45.4 percent. (12 Marks) Solution 1 6–40 An air conditioner removes heat steadily from a house 2) at a rate of 750 kJ/min while drawing electric power at a rate of 6 kW. Determine (a) the COP of this air conditioner and (b) the rate of heat transfer to the outside air. (8 Marks) Answers: (a) 2.08, (b) 1110 kJ/min Solution 2