HW_8_Solution

# HW_8_Solution - Homework Assignment 8 Solution 1. The gas...

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Homework Assignment 8 Solution 1. The gas constant of argon is R = 0.2081 kJ/kg K (Table A-1). Analysis Since the mass remains constant, the ideal gas equation gives 1 1 2 2 1 1 2 2 1 2 1 2 P P P P m RT RT T T  V V V V which when solved for final pressure becomes 1 2 1 1 2 1 1 1 2 1 1 1 2 0.5 0.5(400 kPa) 4 TT P P P P VV 200 kPa 2. The specific volume of steam is to be determined using the ideal gas relation, the compressibility chart, and the steam tables. The errors involved in the first two approaches are also to be determined. Properties The gas constant, the critical pressure, and the critical temperature of water are, from Table A-1, R = 0.4615 kPa·m 3 /kg·K, T cr = 647.1 K, P cr = 22.06 MPa Analysis ( a ) From the ideal gas equation of state, error) (17.6% /kg m 0.03106 3 kPa) (10,000 K) K)(673 /kg m kPa (0.4615 3 P RT v ( b ) From the compressibility chart (Fig. A-15), 84 . 0 1.04 K 647.1 K 673 0.453 MPa 22.06 MPa 10

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## This note was uploaded on 09/05/2010 for the course MEEN 315 taught by Professor Ramussen during the Summer '07 term at Texas A&M.

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HW_8_Solution - Homework Assignment 8 Solution 1. The gas...

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