An insulated piston-cylinder device contains 0.05 m³ of refrigerant- 134a at 32°C and quality of 0.9. The refrigerant is now allowed to expand in a reversible manner until the pressure drops to 0.4 MPa. Determine R-134a 0.05 m³ 32°C x = 0.9 Figure P1 Schematic for Problem 1 (a) the initial pressure of the refrigerant-134a, (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.