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2. An insulated piston-cylinder device contains 0.07 m of saturated refrigerant-134a vapor at 0.8- MPa pressure. The refrigerant is now allowed to expand in

2. An insulated piston-cylinder device contains 0.07 m of saturated refrigerant-134a vapor at 0.8- MPa pressure. The refrigerant is now allowed to expand in a reversible manner until the pressure drops to 0.4 MPa. Determine the work done by the refrigerant. Draw a T-s diagram for this process. R-134a 0.8 MPa

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