] A piston-cylinder device contains 5 kg of R-134a at 800 kPa and 70°C. The refrigerant is now cooled at constant pressure until the temperature drops to 14°C. a) Show the process on a T- v diagram. Draw and label all pressure and temperature lines. b) Determine the work done during this process. c) Determine the amount of heat loss.

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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.