solutions5 - 1 Unsteady Flow A well insulated...

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1 Unsteady Flow A well insulated piston-cylinder assembly has 20 kg of water, 10 kg of which is in the vapor phase. The piston has a mass such that it maintains a fixed internal pressure of 350 kPa. Steam at 1 MPa and 400 C is supplied to the assembly until all the water is vaporized. Determine the following: 1. The final temperature in the cylinder 2. The mass of the steam that was added Assumptions : Quasi-static process Well-insulated ˙ Q cv = 0 Constant and uniform properties at the inlet Control volume is fixed in space and is shown in the figure Ignore kinetic and potential energy effects The final state of the system is saturated vapor. Because the final state of the system is saturated vapor, the final temperature is 138.9 C The quality of the initial state is x = 10 kg / 20 kg = 0 . 5 1
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u 1 1565.43 kJ/kg v 1 0.2627 m 3 / kg h i 3263.9 kJ / kg u 2 2546.9 kJ/kg v 2 0.5243 m 3 / kg Table 1: Relevant properties for the unsteady flow problem.
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This note was uploaded on 03/15/2010 for the course ENGRD 221 taught by Professor Staff during the Fall '08 term at Cornell.

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solutions5 - 1 Unsteady Flow A well insulated...

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