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1 Metrology and Measurement Systems

1 2025

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System for measuring electric parameters of thermoelectric cell battery of a sectional module with thermogenerators

Neska Mirosław, Opara Tadeusz

Metrology and Measurement Systems

2025

Vol. 32, nr 1

1--18

One way to manage low-temperature heat is to convert it directly into DC electricity using thermocells. By placing a single thermoelectric generator or a battery of thermoelectric cells between two heat exchangers, one side with a higher temperature medium and the other with a lower temperature medium, a temperature difference is created between the covers of the thermoelectric elements, which causes heat transfer and the generation of electricity. The module with thermogenerators and exchangers (MTEG) discussed in the article is equipped with a developed measurement system. This system is used to determine the electric current of twenty, serially-connected thermoelectric generators and to measure the electric voltage across the load resistance of the thermoelectric circuit. The publication presents subcircuits for measuring the internal resistance of two thermogenerators placed symmetrically in individual sections of the MTEG module. According to the developed test method, the measurement system was verified in cyclic tests with varying thermodynamic forcing. The accuracies of the test bench electric parameter measurement paths were estimated, yielding expanded uncertainties of ±0.012 W in the measurement of generated electric power and ±0.0008 Ω and ±0.0009 Ω in the resistance of the internal thermogenerators, respectively. Repeatability (EV) was verified and the “capability” of the developed measurement system to function correctly was confirmed.