Thermal performance analysis of a large scale water pit heat storage

Meng Gao, Jianhua Fan*, Simon Furbo, Dengjia Wang, Yanfeng Liu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Solar thermal application is a practical approach to achieving carbon neutrality. Large-scale water pit heat storage (PTES) is a crucial component in ensuring the stability of large-scale solar thermal plants. Based on the model of Type 1535-1301, this paper performs a 2D simulation investigation of the long-term thermal performance of PTES using Trnsys. The accuracy of this model was verified by comparison with measured data from the solar plant in Dronninglund, Denmark. The results show that the average error between the model and the actual measurements is only 3%. The determination coefficients R2 for temperature and energy are more significant than 0.98. In addition, this can find that the PTES average temperature decreases from 24°C to 12°C before the 80th day due to heat losses. During the charging period from the 80th to 250th day, the PTES average temperature increases to 68°C. The PTES formed a temperature stratification with 85°C at the top and 40°C at the bottom. The sloping soil temperature boundary expands and shows a non-uniform stratification of 70-10°C with 5 m thickness. The average temperature of the PTES gradually decreases to 16°C during the discharge period after the 250th day. The storage efficiency is as high as 90.1% because PTES is used for long-term and short-term energy storage. This paper reveals the dynamic thermal process of PTES throughout the year to provide a reference for designers.
Original languageEnglish
Title of host publicationProceedings of the 3rd International Conference on Evolving Cities
Place of PublicationSouthampton
PublisherUniversity of Southampton
Publication date2022
Publication statusPublished - 2022
Event3rd International Conference on Evolving Cities - University of Southampton, Southampton, United Kingdom
Duration: 13 Jul 202215 Jul 2022


Conference3rd International Conference on Evolving Cities
LocationUniversity of Southampton
Country/TerritoryUnited Kingdom
SeriesProceedings of the International Conference on Evolving Cities


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