Shown in the figure below is a system that executes a power cycle while receiving Q1 = 600 Btu by heat transfer at a temperature of T1 = 1500°R and discharging Q2 = 400 Btu by heat transfer at a temperature of T2 = 800°R. A third heat transfer occurs at a temperature of T3 = 600°R. These are the only heat transfers experienced by the system. (a) Applying an energy balance together with Eq. 5.13, determine the minimum and maximum values for Q3, in Btu, for the heat transfer at T3 = 600°R. (b) For the power cycle, evaluate the maximum theoretical thermal efficiency.

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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.