Harman Measurements for Thermoelectric Materials and Modules under Non-Adiabatic Conditions
- Harman Measurements for Thermoelectric Materials and Modules under Non-Adiabatic Conditions
- 현도빈; 김진상; 백승협; 김성근; 권범진; 노임준; 이윤구; 강민수; 이재욱; 주병권
- Thermoelectric; Measurement; Materials; Modules; Harman method; Parasitic thermal effects
- Issue Date
- Scientific Reports
- VOL 6-10
- Accuracy of the Harman measurement largely depends on the heat transfer between the sample and its surroundings, so-called parasitic thermal effects (PTEs). Similar to the material evaluations, measuring thermoelectric modules (TEMs) is also affected by the PTEs especially when measuring under atmospheric condition. Here, we study the correction methods for the Harman measurements with systematically varied samples (both bulk materials and TEMs) at various conditions. Among several PTEs, the heat transfer via electric wires is critical. Thus, we estimate the thermal conductance of the electric wires, and correct the measured properties for a certain sample shape and measuring temperature. The PTEs are responsible for the underestimation of the TEM properties especially under atmospheric conditions (10– 35%). This study will be useful to accurately characterize the thermoelectric properties of materials and modules.
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