Process to be isentropic determine the power input to

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Unformatted text preview: 7–138E A 1.2-ft3 well-insulated rigid can initially contains refrigerant-134a at 120 psia and 80°F. Now a crack develops in the can, and the refrigerant starts to leak out slowly. Assuming the refrigerant remaining in the can has undergone a reversible, adiabatic process, determine the final mass in the can when the pressure drops to 30 psia. R-134a 120 psia 80°F 600 kJ/min 20°C 2.5 kg/s FIGURE P7–138E MIXING CHAMBER 300°C FIGURE P7–132 200 kPa 60°C 7–139 An insulated tank containing 0.4 m3 of saturated water vapor at 500 kPa is connected to an initially evacuated, insulated piston-cylinder device. The mass of the piston is such that a pressure of 150 kPa is required to raise it. Now the valve is opened slightly, and part of the steam flows to the cylinder, raising the piston. This process continues until the pressure in cen54261_ch07.qxd 11/18/03 9:58 AM Page 344 344 FUNDAMENTALS OF THERMAL-FLUID SCIENCES the tank drops to 150 kPa. Assuming the steam that remains in the tank to have undergone a reversible adiabatic process, determine the final temperature (a) in the rigid tank and (b) i...
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This document was uploaded on 11/28/2012.

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