Absolute Method for Measuring of Thermoelectric Properties of Materials

Анатычук, Л. И.; Havryliuk, Mykola; Lysko, V. V.

doi:10.1016/j.matpr.2015.05.110

Cited by 2 publications

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“…The maximum COP and maximum efficiency were calculated for modules made of Bi 2 Te 3 -based materials. The samples of n-and p-type Bi 2 Te 3 -based alloys for cooling and generating modules were grown at the Institute of Thermoelectricity (Ukraine) by the vertical zone-melting technique and their thermoelectric properties were measured using the methods and equipment developed herein [74,75]. The measured temperature dependences of the Seebeck coefficient α(T), the electrical conductivity σ(T) and the thermal conductivity κ(T) are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Efficiency for Miniscale Thermoelectric Converter under the Influence of Electrical and Thermal Resistance of Contacts

Vikhor

Kotsur

2023

Energies

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Mass-produced thermoelectric modules are mainly fabricated with Bi2Te3-based materials. Due to the limited world reserves and the high price of tellurium, it must be saved. The miniaturization of thermoelectric converters is one of the modern trends to diminish the use of tellurium, reduce the cost of modules and expand the range of their applications. The main disadvantage of miniature thermoelectric converters operating in cooling or generating modes is their low energy efficiency, caused by the effect of electrical and thermal resistances of contacts, interconnectors and insulating plates. We propose an improved method for evaluating the maximum efficiency that takes into consideration the impact of these unwanted resistances. This method can also be used to design the modules with the optimal structure for cooling and energy generation, and not only to study their performance. The effect of undesirable electrical and thermal resistances on the maximum efficiency of cooling and generating converters made of Bi2Te3-based materials is analyzed. It is shown that the efficiency of miniature modules can be significantly improved if these resistances are reduced to their rational values. The decrease in electrical contact resistance is the predominant factor. The rational values to which it is advisable to decrease the electrical contact resistance have been determined. In the development of miniscale module technology, it is necessary to focus on such rational contact resistance values.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Efficiency for Miniscale Thermoelectric Converter under the Influence of Electrical and Thermal Resistance of Contacts

Vikhor

Kotsur

2023

Energies

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Digital twin of an apparatus for combined thermoelectric measurements

2023

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A high thermoelectric (TE) figure of merit zT of materials enables a high energy conversion efficiency. The quantity zT is defined by the Seebeck coefficient ( S), the electric ( σ) and thermal ( κ) conductivity, and the absolute temperature ( T). In this paper, we report on a computational model of the Combined ThermoElectric Measurement (CTEM) apparatus, which is a simultaneous characterization method capable of measuring the full set of above-mentioned thermoelectric transport properties between −190 and 600 °C. Currently, the measurement results show deviations due to unidentified error sources. As a solution approach of identifying possible error sources, a digital twin of the CTEM was developed. The computational thermal-electrical circuit model mainly consists of thermal sieving chains representing the relevant sample holder components, in particular two metallic blocks and a TE sample. For a computational consistency check of the measuring principles, ideal conditions are assumed, while no potential error sources are implemented, yet. Here, we present the measurement principles and procedures of creating the computational model of the CTEM. After studies on local discretization, the computational model undergoes a consistency check for model validation. The deviations between input parameters and simulated results of the three mentioned thermoelectric properties have been found negligibly small (≪1%) for ideal measurement conditions. This agreement certifies a realistic representation of the behavior of the sample holder by the digital twin with a satisfying reproduction of ideal measurement conditions by simplifying assumptions and the applicability of underlying measurement principles and evaluation protocols.

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Absolute Method for Measuring of Thermoelectric Properties of Materials

Cited by 2 publications

References 0 publications

Evaluation of Efficiency for Miniscale Thermoelectric Converter under the Influence of Electrical and Thermal Resistance of Contacts

Evaluation of Efficiency for Miniscale Thermoelectric Converter under the Influence of Electrical and Thermal Resistance of Contacts

Digital twin of an apparatus for combined thermoelectric measurements

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