MEASURING THERMAL CONDUCTIVITY OF MATERIALS BASED ON THERMOELECTRIC EFFECT
Keywords:
Thermal Conductivity, Thermoelectric Effect, Peltier Effect, Seebeck Effect, Thermoelectric ModuleAbstract
This work aims to develop an apparatus for measuring the thermal conductivity of bulk materials based on the steady-state method, employing a thermoelectric module (TEM). The cost-effective and easily accessible TEMs were utilized as the heating source, cooling source, and heat flux meter. The TEM was used to generate heating and cooling on the basis of the Peltier effect, which involves the conversion of electricity into thermal energy. On the contrary, the Seebeck effect, based on the direct conversion of thermal energy into electricity, was employed as the principle for creating a heat flux meter. To generate heating or cooling, four TEMs, each with dimensions of 4.0 × 4.0 cm2, were connected in a parallel circuit to form the heating and cooling sets. Each set was in direct contact with a copper heat exchanger plate, creating a sandwich model with an 8.0 × 8.0 cm2 sample material placed in the middle. A TEM was embedded in the copper plate near the heating set to measure the heat passing through the sample surface. To validate the accuracy of this apparatus, the thermal conductivity value of a polystyrene foam, which was tested according to ASTM C518, was compared with the value obtained by using an apparatus developed in this work. The results indicated that this apparatus achieved high accuracy, with an average error of 0.87%.
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