A time-domain analysis method for nonlinear thermoelectric power generation system whose parameters vary with temperature

Abstract

The invention provides a nonlinear thermoelectric power generation system time-domain analysis method having parameters varying with temperature; the method includes: establishing a thermoelectric partial differential equation model and boundary conditions based on basic physical characteristics of a nonlinear thermoelectric power generation system having parameters varying with temperature, wherein Seebeck coefficient in the model is modeled into a function varying with temperature; providing more specific analysis for a heat circuit and electric circuit of the system, performing time-space discretization, establishing an algebraic equation for physical quantities of inner nodes and boundary nodes of a region from the prospective of energy conservation, and performing iterative solving from an initial value of time so that numerical solutions to temperatures and electric field intensities of all parts in the nonlinear thermoelectric power generation system having parameters varying with temperature are finally obtained. By analyzing the numerical solutions to the temperatures and electric field intensities in the thermoelectric power generation system, it is possible to further provide more specific analysis and design for the thermoelectric power generation system, and the results are more precise.

Description

technical field [0001] The invention relates to the technical field of semiconductor thermoelectric power generation, in particular to a time-domain analysis method for a nonlinear thermoelectric power generation system whose parameters vary with temperature. Background technique [0002] In 1821, the German scientist Seebeck discovered that in a closed circuit composed of two different metals, when there is a temperature difference between the two joints, the circuit will generate current. This phenomenon is called the Seebeck effect. Thermoelectric power generation uses the Seebeck effect to generate a certain voltage and electric power output by maintaining a certain temperature difference between the two ends of the thermoelectric material. Through research, it is found that the thermoelectric figure of merit of semiconductor materials is relatively large. At present, the thermoelectric materials used in temperature difference systems are all semiconductor materials, so ...

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Problems solved by technology

[0007] Therefore, the calculation method of the electromotive force of the thermoelectric system in the patent document CN201410189306.6 simply approximates the boundary conditions at the junction of different substances as the fluid balance at the junction, which is only applicable to the constant physical properties of the thermoelectric power generation system, and the boundary can be simply approximated In the case of equilibrium, the analysis of the steady-state linear thermoelectric system is not applicable to the change of material parameters in the thermoelectric power generation system, that is, it cannot be used to analyze the transient process of the dynamic and nonlinear thermoelectric power generation system

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