4.13 0.06 m' of ethane (molar mass 30 kg/kmol), at 6.9 bar and 260°C, is allowed to expand isentropically in a cylinder behind a piston to a pressure of 1.05 bar and a temperature of 107°C. Calculate 7, R, c,, c,. for ethane, and calculate the work donc during the expansion. Assume ethane to be a perfect gas. The same mass of ethane at 1.05 bar, 107°C, is compressed to 6.9 bar according to a law pr1. = constant. Calculate the final temperature of the ethane and the heat flow to or from the cylinder walls during the compression. Calculate also the change of entropy during the compression, and sketch both processes on a p-r and a T-s diagram. (1.219; 0.277 kJ/kg K; 1.542 kJ/kg K; 1.265 kJ/kg K; 54.2 kJ; 377.7°C; 43.4 kJ; 0.0862 kJ/K)

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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.