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An irreversible Ericsson refrigeration cycle model is established, in which multi-irreversibilities such as finite-rate heat transfer, regenerative loss, heat leakage, and the efficiency of the regenerator are taken into account. Expressions for several important performance parameters, such as the cooling rate, coefficient of performance (COP), power input, exergy output rate, entropy generation rate, and ecological function are derived. The influences of the heat leakage and the time of the regenerative processes on the ecological performance of the refrigerator are analyzed. The optimal regions of the ecological function, cooling rate, and COP are determined and evaluated. Furthermore, some important parameter relations of the refrigerator are revealed and discussed in detail. The results obtained here have general significance and will be helpful in gaining a deep understanding of the magnetic Ericsson refrigeration cycle. 相似文献
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燃煤电厂排放的PbCl2毒性极强,且在全球的迁移和积累而受到广泛关注。未燃尽碳被认为是有效去除PbCl2的一种有前景的吸附剂。然而,现有的未燃尽碳模型不能反映实际未燃尽碳表面上的碳缺陷的结构。因此,建立缺陷未燃尽碳模型具有重要的现实意义。此外,碳模型对PbCl2的吸附研究还不够深入,反应机理也不清楚,这极大地阻碍了高效吸附剂的发展。为了揭示PbCl2在缺陷未燃尽碳表面上的吸附机理,利用密度泛函理论(DFT)系统地研究了PbCl2在不同缺陷未燃尽碳表面上的吸附过程,并分析了PbCl2在缺陷未燃烧碳表面上的吸附机理。结果表明,缺陷吸附位点是PbCl2吸附的最佳位点。 相似文献
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A thermal entangled quantum refrigerator based on a two-qubit Heisenberg model with Dzyaloshinskii-Moriya interaction in an external magnetic field 下载免费PDF全文
Based on an isotropic two spin-1/2 qubits Heisenberg model with the Dzyaloshinskii-Moriya interaction in an external magnetic field, we have constructed an entangled quantum refrigerator. Expressions for the basic thermodynamic quantities, i.e., the heat exchanged, the net work input, and the coefficient of performance, are derived. Some intriguing features and their qualitative explanations in zero and non zero magnetic fields are given. The influence of the thermal entanglement on the refrigerator is investigated. The results obtained here have general significance and will be helpful to understand the performance of an entangled quantum refrigerator. 相似文献
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An irreversible cycle model of the quantum Bose Brayton engine is established, in which finite-time processes and irreversibilities in two adiabatic processes are taken into account. Based on the model, expressions for the power output and the efficiency are derived. By using a numerical computation, the optimal relationship between the power output and the efficiency of an irreversible Bose Brayton engine is obtained. The optimal regions of the power output and the efficiency are determined. It is found that the influences of the irreversibility and the quantum degeneracy on the main performance parameters of the Bose Brayton engine are remarkable. The results obtained in the present paper can provide some new theoretical information for the optimal design and the performance improvement of a real Brayton engine. 相似文献
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