Removing the Mystery of Entropy and Thermodynamics — Part IV
(a) A system (sys) is heated using five sequential, progressively hotter reservoirs. Each step entails a finite temperature difference and is irreversible. (b) Sequentially hotter states (A, 1, 2, 3, B) for a system shown on an S-vs-H plot. Temperatures are the reciprocals of the line slopes. Reversibility is achieved in the limit of an infinite number of reservoirs with successive temperature differences approaching zero.
Reversible Carnot cycle heat engine 12341. Segments 12 and 34 are isothermal, and 23 and 41 are adiabatic processes. The shaded+white area represents the input energy at the higher temperature , and the shaded area is the output energy to the colder reservoir at . The work done in one cycle W is the white rectangular area and the thermal efficiency is (white area)/(white+shaded area).
A reversible Carnot cycle with irreversible heat processes at its hotter and colder temperatures. The temperatures and are assumed to be variable and can be chosen to maximize the output power .
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