Nonuniform metal foam design and pore-scale analysis of a tilted composite phase change material system for photovoltaics thermal management

Xinyi Li, Jitong Duan, Terrence Simon, Ting Ma, Tianhong Cui, Qiuwang Wang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Photovoltaics, as a direct technology to convert sunlight into electricity, possess significant potential to deal with ever-increasing environmental problems and the desire to reduce the use of fossil fuels. Thermal stability of photovoltaics is of major concern when considering large-scale commercialization under conditions in which device degradation by high temperature operation is possible. Phase change materials (PCMs) are highly promising for thermal management of such devices due to their high latent heat and inherent heat transfer properties. However, a great challenge in applying PCMs to photovoltaics is in achieving high energy density while maintaining high power density, especially with different orientations of the photovoltaics. In this work, the dynamic heat transfer characteristics of a composite PCM with embedded metal foam are systematically studied by a pore-scale lattice Boltzmann model. It is found that the melting rate of composite PCMs dramatically decreases at late-stage melting, leaving a region of solid PCM (“dead zone”) for a long time. To address this issue, we propose a special, nonuniform structure for the composite PCM that has a different porosity in the dead zone than elsewhere. The melting rate, energy density, and power density of the composite PCM can be significantly enhanced by tailoring the porosity of the composite metal foam. For instance, at a Fourier number of 0.30, the energy density of a case with a dead zone porosity of 0.80 is 6.8% higher than that with a dead zone porosity of 0.95. This work provides an effective strategy toward applying PCMs for thermal management of photovoltaics and paves a way toward optimizing energy storage capabilities of PCMs under various working conditions.

Original languageEnglish (US)
Article number117203
JournalApplied Energy
Volume298
DOIs
StatePublished - Sep 15 2021

Bibliographical note

Funding Information:
This work is financially supported by the National Natural Science and Hong Kong Research Grant Council Joint Research Funding Project of China (Grant No. 5181101182), and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (No.51721004). The authors would like to thank the High Performance Computing Centre of Key Laboratory of Thermo-Fluid Science and Engineering for providing computing resources.

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Gradient metal foam
  • Lattice Boltzmann method
  • Phase change material
  • Pore-scale
  • Thermal management

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