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Mechanically durable thermoelectric power generation module made of Ni-based alloy as a reference for reliable testing
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DOI：10.1016/j.apenergy.2019.114443.png)
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Abstract
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In this study, we fabricated a thermoelectric module made of Ni-based alloy as standard reference for use in cross-checking the power generation characteristics of module testing systems. The module was fabricated with eight pairs of legs made from mechanically durable p-type Ni90Cr10 (chromel) and n-type Cu55Ni45 (constantan). To increase thermal resistance of the module, holes were made in the p- and n-type Ni-based alloys, thereby reducing the effective density of the legs by similar to 57.1%. As a result, a thermal resistance of 6.16 K W-1 was obtained at a hot-side temperature (T-h) of 773 K and cold-side temperature (T-c) of 323 K. A maximum electrical power (P-max) of similar to 0.39 W and maximum conversion efficiency (eta(max)) of similar to 0.53% were obtained for the module with holes at T-h of 773 K and T-c of 323 K. We confirmed the reproducibility of power generation characteristics, including the open circuit voltage (V-oc), internal resistance (R-in), P-max, output heat flow (Q(out)), and eta(max) of the module, through 12 repeated tests and similar to 120 h of continuous tests at Th of 773 K and Tc of 323 K. The variation of V-oc, R-in, P-max, Q(out), and eta(max) is with standard deviation less than 1% from their mean values.
Keywords:
Reference module
Power generation
Chromel
Constantan
Thermoelectrics
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