As shown in the figure below, a reversible power cycle receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc by heat transfer to a cold reservoir at Tc. Hot reservoir 2 at TH Boundary R (a) If TH=600 K and Tc = 400 K, what is the thermal efficiency? H Cold reservoir c at To Wcycle (b) If TH= 500°C, Tc = 20°C, and Wcycle = 200 kJ, what are QH and Qc, each in kJ? (c) If n = 70% and Tc= 40°F, what is TH, in °F? (d) If n = 40% and TH = 727°C, what is Tc, in °C?

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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.