Abstract
The main aim of this work was to construct and test an apparatus for characterization of high temperature thermoelectric modules to be used in thermoelectric generator (TEGs) applications. The idea of this apparatus is based on very precise measurements of heat fluxes passing through the thermoelectric (TE) module, at both its hot and cold sides. The electrical properties of the module, under different temperature and load conditions, were used to estimate efficiency of energy conversion based on electrical and thermal energy conservation analysis. The temperature of the cold side, T c, was stabilized by a precise circulating thermostat (≤0.1°C) in a temperature range from 5°C to 90°C. The amount of heat absorbed by a coolant flowing through the heat sink was measured by the calibrated and certified heat flow meter with an accuracy better than 1%. The temperature of the hot side, T h, was forced to assumed temperature (T max = 450°C) by an electric heater with known power (P h = 0–600 W) with ample thermal insulation. The electrical power was used in calculations. The TE module, heaters and cooling plate were placed in an adiabatic vacuum chamber. The load characteristics of the module were evaluated using an electronically controlled current source as a load. The apparatus may be used to determine the essential parameters of TE modules (open circuit voltage, U oc, short circuit current, I sc, internal electrical resistance, R int, thermal resistance, R th, power density, and efficiency, η, as a function of T c and T h ). Several commercially available TE modules based on Bi2Te3 and Sb2Te3 alloys were tested. The measurements confirmed that the constructed apparatus was highly accurate, stable and yielded reproducible results; therefore, it is a reliable tool for the development of thermoelectric generators.
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Acknowledgements
Work presented in this paper was supported by the National Centre for Research and Development (NCBR, Poland) under the project “Innovative thermoelectric modules for energy harvesting” (project no. PBS3/A5/49/2015). This scientific work has been partially financed as a research postdoctoral project no. DEC-2014/12/S/ST8/00582 from the resources assigned for science by the National Science Centre (NCN, Poland).
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Zybała, R., Schmidt, M., Kaszyca, K. et al. Method and Apparatus for Determining Operational Parameters of Thermoelectric Modules. J. Electron. Mater. 45, 5223–5231 (2016). https://doi.org/10.1007/s11664-016-4712-1
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DOI: https://doi.org/10.1007/s11664-016-4712-1