A comprehensive review on pit thermal energy storage: Technical elements, numerical approaches and recent applications

Yutong Xiang, Zichan Xie, Simon Furbo, Dengjia Wang, Meng Gao, Jianhua Fan*

*Corresponding author for this work

Research output: Contribution to journalReviewpeer-review

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Abstract

Pit thermal energy storage (PTES) is one of the most promising and affordable thermal storage, which is considered essential for large-scale applications of renewable energies. However, as PTES volume increases to satisfy the seasonal storage objectives, PTES design and application are challenged. These difficulties trigged an interest in PTES investigations. This paper aims to identify the success factors and research gaps of PTES by an up-to-date evaluation of 160 recent publications. Existing technical elements that affect PTES thermal properties inclusive geometry design, inlet/outlet design, cover design, and materials, are outlined in depth. Numerical studies are categorized in terms of their mathematical theory and research purposes for a systematic discussion. The current application status of PTES systems worldwide is summarized from four aspects: storage material, geological design, operation strategy, and storage duration. For projects in operation, special attention is given to gathering and comparing operational data on solar fraction, storage efficiency, storage cycle, and PTES temperature. This review outlines the progress and potential directions for PTES design and numerical studies by identifying the research gaps that require further effort.

Original languageEnglish
Article number105716
JournalJournal of Energy Storage
Volume55
Number of pages30
ISSN2352-152X
DOIs
Publication statusPublished - 2022

Keywords

  • Floating cover
  • Liner and insulation material
  • Pit thermal energy storage
  • Recent applications
  • Simulation approaches

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