An irreversible motor operates between reservoirs at Th = 550 K and Tc = 350 K, with an efficiency of 25%. In each cycle heat Qh = 1200 J is extracted from the reservoir at temperature Th, and this heat is added to the working substance in the motor. The heat |Qc| is taken from the motor to the reservoir at temperature Tc. A) Determine the change in entropy of the universe for one cycle of operation B) How much more work could be done by a reversible motor operating between these reservoirs, with the same heat input for each cycle? Justify C) Show that for each cycle, the amount of work that becomes unavailable due to the irreversibility of the process is equal to TcΔSuniverse

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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.