A closed, insulated piston-cylinder device contains air at an absolute pressure of 1.5 bar, an absolute temperature of 400 K, and a volume of 0.02 m³ (State 1). A stirrer in the cylinder adds energy to the air at constant pressure to an absolute temperature of 950 K (State 2). Consider variable properties for air. Calculate the stirrer work, in kJ.

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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.