4.7 Article

Optimized output electricity of thermoelectric generators by matching phase change material and thermoelectric material for intermittent heat sources

期刊

ENERGY
卷 233, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.121113

关键词

Thermoelectric generator; Phase change material; Output power; Electricity generation; Energy harvesting

资金

  1. National Natural Science Foun-dation of China [51876111]
  2. Shanghai MunicipalEducation Commission
  3. Shanghai Education Development Foundation [18SG54]

向作者/读者索取更多资源

The study investigates the impact of phase change temperature of phase change material (PCM) on the output power and generated electricity of PCM-TEG system. Results show that optimizing the phase change temperature of PCM can enhance the total generated electricity by as much as 15.6% through matching PCM with thermoelectric properties of the thermoelement. Furthermore, a relationship between the optimal phase change temperature of PCM and the temperature for maximum figure of merit (ZT) of the thermoelement is established, providing a selection criterion for PCM in TEG modules.
Thermoelectric generators (TEGs) are usually working in intermittent heat source environments, and thus the phase change material (PCM) has been widely adopted in to maintain relatively stable tem-perature difference. The property matching between the PCM and the TEGs is one of the crucial problems to influence the performance of the PCM-TEG system. In this work, the influence of the phase change temperature of the PCM on the output power and generated electricity of PCM-TEG system is studied. Classic Enthalpy model and three-dimensional coupled thermo-electric equations are applied to study the heat transfer and energy conversion mechanisms. Our results show that the output electric energy of a PCM-TEG system can be optimized by tuning the phase change temperature of PCM. The total generated electricity can be enhanced as large as 15.6% by matching the PCM with the thermoelectric properties of the thermoelement. Moreover, by comparing three cases with different thermoelectric materials, we give relationship between the optimal phase change temperature of PCM and the tem-perature for maximum figure of merit (ZT) of the thermoelement, which provides a selection criterion of PCM for TEG module. Our work could be helpful to realize further high efficiency thermoelectric gen-erators for intermittent heat sources. (c) 2021 Elsevier Ltd. All rights reserved.

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