Problem 2 An insulated piston-cylinder device contains 0.2 m³ of saturated refrigerant R-134a vapor at 1 MPa pressure. The refrigerant is now allowed to expand in a reversible manner until the pressure drops to 0.2 MPa. Determine: a. Sketch a possible process on a P-v diagram. Show the saturation lines b. The final temperature in the cylinder. c. The work done by the refrigerant.

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.