In an air compressor, the compression takes place at constant internal energy, and 50 kJ of heat is rejected to the cooling water for every one kilogram of air. Find the work required for the compression. (50 kJ) In a compression stroke of a gas engine, the work done on the gas by the piston is 70 kJ and the heat rejected to the cooling water is 42 kJ. Find the change of the internal energy. Stating whether it is gain or lost. (28 kJ)

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A: N = 505 rpm T = 21 Nm Current I = 4 A Source = 110 V

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A: Given: To determine the total work done by the gas system.

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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.