Abstract
To achieve the accuracy and convenience of thermal conductivity measurement, a thermal balance method for measuring thermal conductivity by compensation of electric cooling or heating based on thermoelectric modules is proposed in this paper. In this method, the thermoelectric module is regarded as the compensation unit to achieve the thermal balance between the compensation and test sides. Using the balance principle, the sample's thermal conductivity to be measured can be obtained by knowing the thermal conductivity of the compensation side. According to theoretical and experimental research, the compensation model is divided into self-supply energy and energy supply modes, and the law of thermal conductivity changes in thermoelectric modules in the two supply modes is summarized. To verify the feasibility of the thermal balance method, the thermal conductivity of alumina ceramics and polymethyl methacrylate (PMMA) materials with large differences in thermal conductivity were measured. The experiment proved that the thermal conductivity of alumina ceramic is 19.23 W/mK, slightly smaller than the standard value. The average thermal conductivity of PMMA is 0.21 W/mK, consistent with standard values. Taking the experiment conditions and error into account, the data are effective, which verified the feasibility of this method.
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