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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
80°F 600 kJ/min
2.5 kg/s FIGURE P7–138E
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.
- Spring '09