An insulated piston–cylinder device contains 0.05 m3 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 (a) the final temperature in the cylinder and (b) the work done by the refrigerant

a) , b)

Explanation:

The piston-cylinder device is modelled after the First Law of Thermodynamics:

The properties of the refrigerant 134a are, respectively:

Initial State (Saturated Vapor)

Final State (Liquid-Vapor Mixture)

a) The final temperature in the cylinder is .

b) The work done by the refrigerant is:

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