a=2, f=3 A vertical "2a" cm diameter piston-cylinder device contains an unknown ideal gas at 1 bar and 24 "C. Initially, the inner face of the piston is “4f" cm from the base of the cylinder. The air in system undergoes an internally reversible compression process with a boundary work of "1.f" kJ. The temperature of the gas remains constant during this process. If the molecular weight of the unknown gas is 27 kg/kmol, determine; a) the amount of heat transfer during the process, in kJ, and comment about its direction b) the final pressure of air in the cylinder, in kPa c) the entropy change during the process, in kj/K d) draw P-v and T-s graph in detail. D

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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.