A time-domain analysis method for dynamic thermoelectric power generation system with time-varying hot end temperature

Abstract

The invention provides a time domain analysis method for a dynamic thermoelectric power generation system with time-varying hot end temperature. According to the method, first, a thermoelectric partial differential equation model and boundary conditions based on basic physical properties of the dynamic thermoelectric power generation system with the time-varying hot end temperature are established; second, a system thermal circuit and a circuit are analyzed more concretely, time and space discretization processing is performed, an algebraic equation for physical quantities of region internal nods and boundary nodes is established from the perspective of energy conservation, and then iterative solving is performed from a time initial value; and finally numerical solutions to temperature at all positions and electric field intensity in the dynamic thermoelectric power generation system with the time-varying hot end temperature can be obtained. Through analysis of the numerical solutions to the temperature and the electric field intensity in the dynamic thermoelectric power generation system, the system can be further analyzed and designed more concretely, and the result is 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 dynamic thermoelectric power generation system with time-varying hot end 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 it ...

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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 when the thermoelectric power generation system is in an unbalanced state, that is, it cannot be used to analyze the transient process of the dynamic thermoelectric power generation system

[0008] In the actual thermoelectric system, if according to the working conditions, the heat source at the boundary of the thermoelectric power generation system needs to be equivalent to the temperature input that changes with time, the thermoelectric power generation system at this time is in a non-equilibrium state, and the different substances in the thermoelectric power generation system The boundary conditions at the junction cannot be simply approximated by the fluid equilibrium at the junction

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