Testing apparatus and testing method of thermoelectric conversion efficiency of thermoelectric module group

Abstract

The invention discloses a testing apparatus and testing method of a thermoelectric conversion efficiency of a thermoelectric module group. A heating bench protection fence encircles the side surface of an electric heating bench; a measuring assembly for installing a thermoelectric module group is installed on the electric heating bench; and a compression assembly for compressing the measuring assembly is fixed on upper sides of support rods. An outer cover is arranged on a base plate. A gap of internal space between the base plate and the outer cover is filled with a thermal insulation material. The thermoelectric module group is heated and a cold end of the thermoelectric module group is cooled. The compression device applies pressures to guarantee the good contact among all contact surfaces, so that a stable temperature difference between the two ends of the thermoelectric module group is kept and an electromotive force is generated. With a peripheral circuit, calculation is carried out based on temperature values measured by an upper standard measuring block and a lower standard measuring block, thereby obtaining input powers of the thermoelectric module group on different conditions and a heat flow rate inputted into a hot end and thus obtaining a conversion efficiency. According to the invention, various thermoelectric performance parameters of the thermoelectric module group under different pressures and different temperature differences can be tested comprehensively and thus a basis is provided for evaluating the performance of the thermoelectric module group comprehensively.

Description

technical field [0001] The invention relates to a test device and a test method, in particular to a test device and a test method for the thermoelectric conversion efficiency of a thermoelectric module. Background technique [0002] As a new form of power generation that directly converts thermal energy into electrical energy, thermoelectric power generation has many advantages such as no noise, no wear, no medium leakage, small size, light weight, convenient movement, and long service life. On the one hand, it provides a new form of power supply for some occasions where power supply is inconvenient, such as space exploration, long-distance signal transmission in remote areas, unmanned signal lights at sea, micro-robots in the body, etc.; on the other hand, it also shows great potential in waste heat recovery. potential. In today’s society, there is a lot of waste heat in fireplaces, steel plants, and automobile exhaust. For these low-grade heat sources, thermoelectric power...

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Problems solved by technology

[0004] The performance of thermoelectric modules is affected by materials and preparation processes, which play a decisive role in the application of thermoelectric modules. Therefore, appropriate measuring devices are needed to test the performance of thermoelectric modules. Traditional testing devices can only test thermoelectric modules. The open-loop output voltage and output power of the module cannot obtain the important data of the conversion efficiency of the thermoelectric module; and the heat flow sensor used in the device for testing the conversion efficiency of the thermoelectric module is expensive and complicated to use

According to relevant patents, Wuhan University of Technology applied for a patent "a device for testing the characteristics of thermoelectric modules" (patent application number: 201510731043.1) in 2015. This patent built a device for measuring the characteristics of thermoelectric modules. Module, constant temperature heat source, cold end heat exchanger, electronic load, water tank, water pump, cooling device, hot end temperature control device, cold end temperature control device, data collector, power supply and other parts, but only the thermoelectric module can be tested In 2014, China Huaneng Group Clean Energy Technology Research Institute Co., Ltd. applied for a patent "thermoelectric module test system and thermoelectric module test method" (patent application number: 201410256942.6 ), the patent builds a test system including an electrical performance test unit, a heat flux detection unit and a processor, which can measure and calculate the thermoelectric conversion efficiency, but it measures the heat flow at the cold end by arranging multiple heat flow sheets, which is costly and uses It is complicated, and it is impossible to directly obtain data such as input heat flow, and at the same time, there is a problem of inaccurate measurement due to heat loss without adiabatic

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