![]() cycle was described mathematically by Sadi Carnot in 1824 as a heat engine. T_L: absolute temperature of the heat sink, in KelvinĪ heat pump provides 20 kW of heating to a house in winter. Thermodynamic heat pump and refrigeration cycles are the models for heat. T_H: absolute temperature of the heat source, in Kelvin Yet, it is also very important theoretically, for it plays a major role in the development of another important statement of the second law of thermodynamics. ![]() At a practical level, this cycle represents a reversible model for the steam power plant and the refrigerator or heat pump. ![]() ![]() The Kelvin-Planck and Clausius statements of the second law indicate that for heat engines, \eta_: coefficient of performance of a Carnot heat pump, dimensionless The Carnot cycle is of special importance for a variety of reasons.
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