ass10_corrected

ass10_corrected - ENGRD 221 ENGINEERING THERMODYNAMICS...

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ENGRD 221: E NGINEERING T HERMODYNAMICS Problem Set 10 Due: April 10 th 2009, Upson Room 123 (5 Questions) Question 1 (MS 9.6) : A four-cylinder, four-stroke internal combustion engine operates at 2800 RPM. The processes within each cylinder are modeled as an air-standard Otto cycle with a pressure of 14.7 lbf/in. 2 , a temperature of 80°F, and a volume of 0.0196 ft 3 at the beginning of compression. The compression ratio is 10, and maximum pressure in the cycle is 1080 lbf/in. 2 . Determine, using a cold air-standard analysis with k = 1.4, the power developed by the engine, in horsepower, and the mean effective pressure, in lbf/in. 2 . Question 2 (MS 9.14) : A four-cylinder, four-stroke internal combustion engine has a bore of 2.55 in. and a stroke of 2.10 in. The clearance volume is 12% of the cylinder volume at bottom dead center and the crankshaft rotates at 3600 RPM. The processes within each cylinder are modeled as an air-standard Otto cycle with a pressure of 14.6 lbf/in. 2
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ass10_corrected - ENGRD 221 ENGINEERING THERMODYNAMICS...

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