ps6_final

ps6_final - 16.050 Thermal Energy Time spent on problems:...

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16.050 Thermal Energy Problem Set #6– Fall 2002 Time spent on problems: Problem 1: Problem 2: Problem 3: Problem 4: Problem 5: Problem 6:
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16.050 Thermal Energy Problem Set #6 – Fall 2002 Do all problems. Please use a separate sheet of paper for each problem. 1. An Otto cycle with a compression ratio of 7.5 operates from the suction conditions of 100 kPa, 30 o C. Find the pressure and temperature at the end of the compression (a) if cold air ( k= 1.4) is the working substance, (b) if hot air ( k =1.32) is the working substance. Compare answers. (c) Solve for the ideal thermal efficiency based upon the conditions given in (a) and (b) . 2. For an ideal Otto engine operating with cp=1 kJ/kgK, the temperature at the end of isentropic compression is 450 o C and at the end of expansion is 1400 o C. The compression ratio is r= 7.5. Find the work and the efficiency. 3. An ideal Diesel engine operates on 0.01 m 3 (measured at state 1) of air. Let P 1 = 100 kPa, T 1 =60 o C, r =14, and let the cutoff be at 6% of the stroke (where cutoff is
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This note was uploaded on 01/28/2012 for the course AERO 16.050 taught by Professor Zoltanspakovszky during the Fall '02 term at MIT.

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ps6_final - 16.050 Thermal Energy Time spent on problems:...

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