A thermoelectric cooling system usually consists of a thermoelectric cooler (TEC) and heat exchangers at the cold side and the hot side. Heat exchangers in TEC systems are designed to minimize their thermal resistance under restrictions such as the size of the system and heat transfer method, because as the thermal resistances of heat exchangers increase, the performance of TEC systems decreases. In the TEC system in which thermal resistance of heat exchangers is minimized, the optimum TEC is analyzed to maximize the coefficient of performance (COP) and the exergetic efficiency in absorbing a given heat load. The effects of the thermal resistance of heat exchangers on the performance of the TEC system and the design parameters of that system are also investigated. To discuss these matters, dimensionless entropy flow equations of the TEC system are introduced, and the COP and the exergetic efficiency are expressed as a function of dimensionless quantities by using these dimensionless equations.
Influence of processing parameters on the thermoelectric properties of (Bi0.2Sb0.8)2Te3 sintered by ECAE AIP Conf.Anisotropic thermoelectric characteristics of a sintered Bi,Te, system have been evaluated on the basis of the orientation distribution of crystallites. Uniaxially anisotropic resistivities, Hall coefficients, and thermal conductivities of sintered BizTe, were expressed by linear combinations of those of single crystal. The combination coefficients are specified by an anisotropy parameter that may be estimated by the anisotropy in the observed resistivities. 'Iwo types of x-ray diffraction experiments were performed to confirm the validity of the estimate. The observed diffraction intensities were reasonably consistent with the orientation distribution predicted by the anisotropy parameter. Theoretical curves of resistivities, Hall coefficients, and thermal conductivities of the sintered material were calculated by using the orientation distribution which was specified by a parameter estimated by the observed resistivities. The theoretical curves were in reasonable agreement with the observed data.
coefficient of performance(C0P) for a thermoelectric cooling system(TEC system) which consists of a thermoelectric cooler(TEC) and heat-exchangers at the cold side and the hot side. Optimizing a TEC in the TEC system for the maximum COP can be performed by using the balance equations of nondimensional entropy flow, when the thermal resistances of heat-exchangers for a TEC system are given and the system operates under a constant temperature difference. In these equations, the COP of the TEC system becomes a function of non-dimensional thermal resistance of the cold side heatexchanger and non-dimensional entropy flow at the cold side An optimum design is investigated to maximize the In this paper , a simulation method of optimizing a TEC in a TEC system is discussed by using the non-dimensional entropy flow equations' which are a extension of the heat balance equations of TEC systems. In these simulations, the thermoelectric properties of thermoelements are approximated by the values determined from the average temperature of the operating TEC6.
Non-dimensional entropy flow equationsTo generally discuss the optimization of a TEC in the TEC system shown in Fig.1, the following non-dimensional entropy flow equations for a TEC system are used:(2) 1 . 2 1 q c -j e + -1 -~( l + -) + -of the TEC system. Therefore the COP of the TEC system is shown as a contour graph on these two variables. By using this of the TEC system can be determined, but the degrading effect 2 ZTc graph, not only TEC design parameters for the maximum COP q H -J 6 -L ] z L 6 ( 1 + -) + -by thermal resistances of the TEC system on the COP can also be evaluated. E 1 -Pi ( l +~+~j ) (~-~j ) + ( l +~j j ) B '( 3 )
IntroductionWhen thermoelectric coolers(TECs) are used in various applic&ms, it is important to design a TEC for obtaining the maximum COP of the TEC system in which the thermal resistance of heat-exchangers are given and which operates under a constant temperature difference. Several attempts have been done to analyze the performance of a TEC or a TEC system by various However these methods are not convenient form to simulate the optimum TEC in a TEC system.
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