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Refrigerant 134a expands in a piston-cylinder assembly from p₁ = 160 lb/in² and T₁ = 140°F to p2 = 30 lb/in² and T₂ = 80 °F. The
mass of refrigerant is 0.5 lb. During the process, the work done by the refrigerant is 4.32 Btu. Kinetic and potential energy effects are
negligible.
Determine the initial volume of the refrigerant, V₁, in ft3, and the heat transfer for the process, in Btu.

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