0.03-m of air is contained in the spring-loaded piston-cylinder device shown in Fig. P4-53. The spring constant is 875 N/m, and the piston diameter is 25 cm. When no force is exerted by the spring on the piston, the state of the air is 2250 kPa and 240°C. This device is now cooled until the vol- ume is one-half its original size. Determine the change in the internal energy and enthalpy

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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.