Unformatted text preview: and the change in the total internal energy of the R-134a. Answers: -10°C, -110 kJ/kg 6. Water initially at 300 kPa and 250°C is contained in a piston-cylinder device fitted with stops. The water is allowed to cool at constant pressure until it exists as a saturated vapor and the piston rests on the stops. Then, the water continues to cool until the pressure is 100 kPa. Find the overall change in internal energy between the initial and final states per unit mass of water. Answers: 1566 kJ/kg 7. Determine the specific volume and internal energy of compressed liquid water at 80°C and 20 MPa using the saturated liquid approximation. Compare these values to the ones obtained from the compressed liquid tables....
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- Spring '08