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New method for quickly measuring the maximum conversion power of a thermoelectric module/generator

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  • Gao, Junling
  • Tang, Kechen
  • Yan, Yonggao
  • Zhang, Shimin

Abstract

Maximum output power (Pomax) is the main characteristic parameter of energy conversion of a thermoelectric module (TEM)/generator (TEG). To obtain this parameter, the module’s dynamic internal resistance under the actual operating condition must be accurately determined to realize load matching. Our theoretical analysis reveals that the dynamic internal resistances are almost identical when the module achieves three stable operating conditions, i.e., maximum power output, open circuit, and short circuit, with stable temperature differences between the cold and hot sides. Based on this conclusion, a new method to quickly and accurately acquire the Pomax of a TEM using thermal inertia, open-circuit voltage, and short-circuit current is proposed. This method can quickly determine the TEM dynamic internal resistance at Pomax, which can be set as the load, to directly achieve dynamic matching between load and internal resistance. This is the first study that reports the Pomax of a TEM/TEG with only one measurement; this can significantly reduce the time spent using the traditional method, which requires multiple measurements with varying loads. The experiment verified the high accuracy and low error (less than 1%) of the method.

Suggested Citation

  • Gao, Junling & Tang, Kechen & Yan, Yonggao & Zhang, Shimin, 2020. "New method for quickly measuring the maximum conversion power of a thermoelectric module/generator," Energy, Elsevier, vol. 197(C).
    • Handle: RePEc:eee:energy:v:197:y:2020:i:c:s0360544220302607
    DOI: 10.1016/j.energy.2020.117153
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    References listed on IDEAS

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