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- W2328767493 abstract "An analysis of the efficiency and coefficient of performance (COP) for general heat engines and refrigerators with nonisothermal processes is conducted under the trade-off criterion. The specific heat of the working medium has significant impacts on the optimal configurations of heat devices. For cycles with constant specific heat, the bounds of the efficiency and COP are found to be the same as those obtained through the endoreversible Carnot ones. However, they are independent of the cycle time durations. For cycles with nonconstant specific heat, whose dimensionless contact time approaches infinity, the general alternative upper and lower bounds of the efficiency and COP under the trade-off criteria have been proposed under the asymmetric limits. Furthermore, when the dimensionless contact time approaches zero, the endoreversible Carnot model is recovered. In addition, the efficiency and COP bounds of different kinds of actual heat engines and refrigerators have also been analyzed. This paper may provide practical insight for designing and operating actual heat engines and refrigerators." @default.
- W2328767493 created "2016-06-24" @default.
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- W2328767493 date "2015-04-22" @default.
- W2328767493 modified "2023-10-18" @default.
- W2328767493 title "Unified trade-off optimization for general heat devices with nonisothermal processes" @default.
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- W2328767493 doi "https://doi.org/10.1103/physreve.91.042127" @default.
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