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【期刊论文】Quantum refrigeration cycles using spin-1/2 systems as the working substance
何济洲, Jizhou He, Jincan Chen*, Ben Hua
PHYSICAL REVIEW E, VOLUME 65, 036145-1-036145-8,-0001,():
-1年11月30日
The cycle model of a quantum refrigerator composed of two isothermal and two isomagnetic field processes is established. The working substance in the cycle consists of many noninteracting spin- 1/2 systems. The performance of the cycle is investigated, based on the quantum master equation and semigroup approach. The general expressions of several important performance parameters, such as the coefficient of performance, cooling rate, and power input, are given. Especially, the case at high temperatures is analyzed in detail. The results obtained are further generalized and discussed, so that they may be directly used to describe the performance of the quantum refrigerator using spin-J systems as the working substance. Finally, the optimum characteristics of the quantum Carnot refrigerator are derived simply.
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何济洲, Jizhou He a, b, Jincan Chen a, *, Ben Hua c
Applied Energy 72(2002)541-554,-0001,():
-1年11月30日
The influence of quantum degeneracy on the performance of a Stirling refrigeration cycle is investigated, based on the equation of state of an ideal Fermi gas. The inherent regenerative losses and the coefficient of performance (COP) of the cycle are calculated. It is found that, under the condition of strong gas degeneracy, the COP of the cycle in the first approximation is a function only of the temperatures of the heat reservoirs, while under other conditions, the COPs of the cycle depend on the temperatures of the heat reservoirs and other parameters of the cycle. The results obtained here reveal the general performance characteristics of a Stirling refrigeration cycle having a Fermi gas as its working substance.
Stirling refrigeration cycle, Fermi gas, Quantum degeneracy, Regenerative loss, Coefficient of performance
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【期刊论文】Regenerative characteristics of electrocaloric Stirling or Ericsson refrigeration cycles
何济洲, Jizhou He a, b, Jincan Chen a, *, Yinghui Zhou a, Jin T. Wang c
Energy Conversion and Management 43(2002)2319-2327,-0001,():
-1年11月30日
The thermodynamic properties of the dielectric materials are analyzed in detail, based on the Curie law, Curie-Weiss law andother relations betweenthe electrical polarization and the electric fieldstren gth. It is proven that the specific heat at constant electrical polarization is only a function of temperature, while the specific heat at constant electric field strength is dependent on the electric field strength and temperature. Moreover, the regenerative characteristics of the electrocaloric Stirling andEricsso n refrigeration cycles are discussed. Some important conclusions are obtained.
Electrocaloric refrigeration cycle, Dielectric material, Specific heat, Regenerative haracteristic
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【期刊论文】Inherent regenerative losses of a ferroelectric Ericsson refrigeration cycle
何济洲, Jizhou He a, b, Jincan Chen a, ∗, Jin T.Wangc, Ben Hua d
International Journal of Thermal Sciences 42(2003)169-175,-0001,():
-1年11月30日
The performance of a ferroelectric Ericsson refrigeration cycle is investigated on the basis of the statistic relation between the electrical polarization and the electric field strength of the ferroelectric materials. The inherent regenerative losses in the cycle are calculated. The coefficients of performance of the cycle are derived. Moreover, the performance of the Ericsson refrigeration cycle using other dielectric materials as the working substance is discussed. The results obtained here may reveal the general characteristics of the electrocaloric Ericsson refrigeration cycle.
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何济洲, Jizhou He, Jincan Chen*, Chih Wu
Transactions of the ASME Vol. 125, DECEMBER 2003,-0001,():
-1年11月30日
A general irreversible cycle model of a magnetic Ericsson refrigerator is established. The irreversibilities in the cycle model result from the finite-rate heat transfer between the working substance and the external heat reservoirs, the inherent regenerative loss, the additional regenerative loss due to thermal resistances, and the heat leak loss between the external heat reservoirs. The cycle model is used to optimize the performance of the magnetic Ericsson refrigeration cycle. The fundamental optimum relation between the cooling rate and the coefficient of performance of the cycle is derived. The maximum coefficient of performance, maximum cooling rate and other relevant important parameters are calculated. The optimal operating region of the cycle is determined. The results obtained here are very general and will be helpful for the optimal design and operation of the magnetic Ericsson refrigerators. [DOI: 10.1115/1.1616037]
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