example 3-1 - Example 3-1 Nitrogen expands in a...

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Example 3-1 Nitrogen expands in a piston-cylinder assembly from an initial volume of 210 cm 3 to a final volume of 430 cm 3 . The mass of nitrogen present is and the initial temperature is 40°C. During the expansion, pressure is constant. Using the ideal gas model, determine 4 31 0 k g × a) pressure in kPa b) work done in J c) final temperature in °C Solution: a) Using EES: 33 1 1 46 3 210cm 1m m 0.7 g 1 0cm k g V v m ⎛⎞ == = ⎜⎟ × ⎝⎠ 3 P = PRESSURE( N2, T =40, V = v 1 ) P = 133 kPa Alternatively: () 3 kJ 1000J 8.314 40 273 K kmol K 1kJ mk g 0.7 28.0 kg kmol RT P vM + 3 133 10 Pa 133kPa P = b) To find work, assume a quasi-equilibrium process = WP d V
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Since pressure is constant () 21 = WPd V PV V =− ( ) 3 3 1m 1000Pa = 133kPa 430 210 cm
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This note was uploaded on 04/06/2009 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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example 3-1 - Example 3-1 Nitrogen expands in a...

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