For cycle mathematica6/20/2023 ![]() The area enclosed by either the pV or TS curves equals the work produced per cycle. To get, the cold reservoir would have to be at, absolute zero, which is unattainable. The efficiency of a Carnot cycle depends only on the temperatures of the two reservoirs:, where and are measured on the absolute temperature scale (in K). Since the heat is essentially wasted, the efficiency of the heat engine is expressed as the ratio. Numerical values of, and in kJ are shown. The fraction is rejected to the cold reservoir at temperature, with the difference converted into work. In each cycle of the engine, a quantity of heat is withdrawn from the hot reservoir at temperature. An accurately-drawn pV diagram of a Carnot cycle approximates a narrow crescent, in contrast to the more familiar pictures shown in many physical chemistry texts that have aspect ratios around 1.Ī schematic diagram of an idealized heat engine is shown on the right.
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