A time-domain analysis method for dynamic thermoelectric power generation system with time-varying heat flow at the hot end

Abstract

The invention discloses a time domain analysis method for a hot end heat flow time-varying dynamic thermoelectric power generation system. A thermoelectric partial differential equation model and boundary conditions are established based on basic physical characteristics of the hot end temperature time-varying dynamic thermoelectric power generation system; relatively specific analysis is carried out on a thermal circuit and an electric circuit of the system; time and space discretization is carried out; algebraic equations for physical quantities of internal nodes and boundary nodes in an area are established from an angle of energy conservation; starting from a time initial value, iteration solution is carried out; and numerical solutions of temperature and electric field intensity at various positions in the hot end temperature time-varying dynamic thermoelectric power generation system are obtained. Through analysis of the numerical solutions of the temperature and electric field intensity in the dynamic thermoelectric power generation system, relatively specific analysis and design can be carried out on the system, and the result is relatively 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 heat flow. 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 is...

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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 heat flow input that changes with time, the thermoelectric power generation system at this time is in a non-equilibrium state. The boundary conditions at can not be simply approximated by the fluid equilibrium at the junction

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