Solution HW Ch 4 - ME 113 THERMODYNAMICS Spring 2008 Ch 4 HW Solution 1 Problem 4-11 Saturated water vapor in a cylinder is heated at constant

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ME 113: THERMODYNAMICS Spring 2008 Ch 4 HW Solution 1
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Problem # 4-11 Saturated water vapor in a cylinder is heated at constant pressure until its temperature rises to a specified value. The boundary work done during this process is to be determined. Assumptions The process is quasi-equilibrium. Properties Noting that the pressure remains constant during this process, the specific volumes at the initial and the final states are (Table A-4 through A-6) /kg m .71643 0 C 200 kPa 00 3 /kg m 0.60582 vapor Sat. kPa 300 3 2 2 2 3 kPa 300 @ 1 1 = ° = = = = = v v v T P P g Analysis The boundary work is determined from its definition to be kJ 165.9 = - = - = - = = 3 3 1 2 1 2 2 1 out , m kPa 1 kJ 1 /kg m 0.60582) 43 kPa)(0.716 kg)(300 (5 ) ( ) ( v v V V V mP P d P W b Discussion The positive sign indicates that work is done by the system (work output). Problem # 4-19 Nitrogen gas in a cylinder is compressed polytropically until the temperature rises to a specified value. The boundary work done during this process is to be determined. Assumptions 1 The process is quasi-equilibrium. 2 Nitrogen is an ideal gas. Properties
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This homework help was uploaded on 04/12/2008 for the course ME 113 taught by Professor Usaxena during the Spring '07 term at San Jose State University .

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Solution HW Ch 4 - ME 113 THERMODYNAMICS Spring 2008 Ch 4 HW Solution 1 Problem 4-11 Saturated water vapor in a cylinder is heated at constant

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