hw5_assig

hw5_assig - c. the pressure at the end of adiabatic...

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MAE 110A Winter 2010 HW #5 Due: Friday, February 19 (beginning of class 12:00 noon) Note : Draw T - s diagrams wherever possible! Text Problems: 6.23, 6.32, 6.41, 6.46 Handout Problems: H5.1 Consider a Carnot power cycle which consists of 0.5 kg of air contained in a piston cylinder assembly (see Fig. 5.14 in text). At the start of the isothermal expansion process, the temperature is T 2 = 627 C and the pressure is p 2 = 8 MPa. The isothermal compression process occurs at T 4 = 22 C and the heat addition per cycle is 45 kJ. Assume ideal gas behavior. Determine: a. sketch cycle on a T - s diagram b. the pressure at the end of isothermal expansion process
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Unformatted text preview: c. the pressure at the end of adiabatic expansion process d. the net work output of the cycle [kJ/kg] e. thermal eciency of the cycle H5.2 Two kilograms of air, initially at 100 kPa and 20 C, are contained in an insulated piston-cylinder assembly. The air is compressed to 500 kPa. Determine: a. minimum possible work required to compress air (clearly justify your result , that it is the minimum possible ) b. if the actual work is 25% greater, the nal temperature of the air and the entropy produced during the process c. show both processes on T-s diagram...
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This note was uploaded on 04/21/2010 for the course MAE 110A taught by Professor Stefang.llewellynsmith during the Spring '08 term at UCSD.

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