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Updated: Mar 31, 2026
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
Published on: February 5, 2020
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Bridging heat-flow and guarded-heater methods for thermoelectric module efficiency evaluation.
Yasutaka Amagai1,2, Kenjiro Okawa1,2, Ryoji Funahashi3
1National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan.
Iscience
|March 30, 2026
Summary
This study introduces a novel apparatus for thermoelectric module efficiency evaluation, significantly reducing heat loss uncertainties. The new method achieves precise measurements, improving reliability for thermoelectric technology advancements.
Area of Science:
- Materials Science
- Energy Science
- Thermodynamics
Background:
- Thermoelectric efficiency evaluation faces challenges due to heat loss.
- Existing methods like heat-flow and guarded-heater lack precision.
- Lateral heat losses from thermoelectric modules introduce significant uncertainties.
Purpose of the Study:
- To develop a novel apparatus for accurate thermoelectric module efficiency evaluation.
- To minimize uncertainties caused by lateral heat losses.
- To establish a reliable method for thermoelectric device characterization.
Main Methods:
- Introduction of an apparatus with a thermally matched guard ring and vacuum gap.
- Establishing near-isothermal sidewalls to suppress radiative heat losses.
- Conducting measurements up to 703 K with input heat flow up to 124 W.
Main Results:
- The new apparatus demonstrated input-output agreement within 0.5 W.
- Unguarded configurations showed discrepancies exceeding 5 W.
- Achieved an expanded uncertainty of 1.4% in efficiency evaluations.
Conclusions:
- The developed apparatus significantly enhances the reliability of thermoelectric efficiency evaluations.
- The method suppresses radiative losses, improving measurement accuracy.
- This provides a technical basis for future international standardization in thermoelectric measurements.
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