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SpecialProblems11-12 - The initial temperature and pressure...

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Special Problems for ME 200 - Spring 2011 Problems Due February 11, 2011 SP 11: Steam contained in a piston-cylinder device is cooled slowly at a constant pressure of 700 kPa. The mass of the steam is 2.2 kg. The initial volume is 1.0267 m 3 and final volume is 0.75 m 3 . Find a) the initial and final temperature (°C) of the steam, b) the work (kJ), and c) the heat transfer (kJ) associated with this process. SP 12: Heat is added to 4 kg of water in a rigid tank.
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Unformatted text preview: The initial temperature and pressure of the water are 20°C and 2.5 MPa respectively. The final water temperature is 40°C. Find the heat transferred (kJ) to the water by three different methods: a) Using compressed liquid water tables b) Using the saturated water (liquid-vapor) table. (Hint: make an approximation to obtain the compressed liquid state). c) Using constant specific heats (use the value for water at 300K)....
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