TY - JOUR
T1 - A comprehensive review on pit thermal energy storage
T2 - Technical elements, numerical approaches and recent applications
AU - Xiang, Yutong
AU - Xie, Zichan
AU - Furbo, Simon
AU - Wang, Dengjia
AU - Gao, Meng
AU - Fan, Jianhua
N1 - Publisher Copyright:
© 2022 The Author(s)
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Floating cover
KW - Liner and insulation material
KW - Pit thermal energy storage
KW - Recent applications
KW - Simulation approaches
U2 - 10.1016/j.est.2022.105716
DO - 10.1016/j.est.2022.105716
M3 - Review
AN - SCOPUS:85131139017
VL - 55
JO - Journal of Energy Storage
JF - Journal of Energy Storage
SN - 2352-152X
M1 - 105716
ER -
