Two identical piston-cylinder devices are each filled with 1 kg air at T = 300 K and P = 2 bar. Next, one of the gases undergoes a reversible and isothermal expansion, and the other one expands isentropically. Both of the gases stop expanding when their final volumes reach twice of their initial volumes. [5] a) Sketch both of these processes on the same T-S plot. Indicate the direction of the expansion process on the plot. (No need to express the values for T and S on the plot) [5] b) Sketch both of these processes on the same P-V plot. Indicate the direction of the expansion process on the plot. (No need to express the values for P and V on the plot) [10] c) Calculate the heat transfer between the air and the surrounding for each process separately.

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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.