Consider where necessary: R = 8.314 J/mol∙K 1 cal = 4.19 J kb =1,38 x 10⁻²³ m² kg s⁻² K⁻¹   A thermal machine runs the reversible cycle ABCA with 9.0 mols of an ideal gas, as shown in the figure. The CA process is adiabatic. The temperatures at points A and B are 300 K and 500 K, respectively. The volume at point C is 0.20 m³. The constant γ (gamma) of the gas is worth 1.60. (a) What is the thermal efficiency of this machine? (b) Let T_Q and T_F be the temperatures of the hot and cold reservoirs, respectively. What conditions on T_Q and T_F ensure that the machine operates?

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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.