# example 12-2 - Example 12-2 A piston-cylinder assembly...

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Example 12-2 A piston-cylinder assembly initially contains 130 in 3 of superheated steam at 400°F, 30 psia. The steam is compressed slowly at constant pressure until liquid droplets start to form. During the compression, the cylinder is cooled to maintain the steam at constant pressure. a) Show the process on a T-v diagram. b) Calculate the mass of steam. c) Calculate the work done in ft·lbf d) Calculate the heat transferred in Btu. Solution a) b) 1 1 V m v = 3 1 ft VOLUME(steam, 400, 30) 16.9 lbm vT P == = =

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3 3 1 3 130in 0.0752ft 12in 1ft V == ⎛⎞ ⎜⎟ ⎝⎠ 3 3 0.0752ft 0.00445lbm ft 16.9 lbm m c) Assume the process is quasi-static. Work for this constant pressure process is () 21 WP d VP VV ==−
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example 12-2 - Example 12-2 A piston-cylinder assembly...

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