Experimental and theoretic investigations of thermal behavior of a seasonal water pit heat storage

Jianhua Fan, Junpeng Huang, Angelos Chatzidiakos, Simon Furbo

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Seasonal heat storages are considered essential for district heating systems because they offer flexibility for the system to integrate different fluctuating renewable energy sources. Water pit thermal storages (PTES) have been successfully implemented in solar district heating plants in Denmark. Thermal behavior of a 75,000 m3 water pit heat storage in Marstal solar heating plant was investigated experimentally and numerically. Temperatures at different levels of the water pit storage and temperatures at different depths of the ground around the storage were monitored and analyzed. A simulation model of the water pit storage is built to investigate development of temperatures in and around the storage. The calculated temperatures are compared to the monitored temperatures with an aim to validate the simulation model. Thermal stratification in the water pit heat storage and its interaction with the ground are
elucidated by calculations using the validated CFD model.
Original languageEnglish
Publication date2017
Number of pages12
Publication statusPublished - 2017
EventSolar World Congress 2017 - Abu Dhabi, United Arab Emirates
Duration: 29 Oct 20172 Nov 2017


ConferenceSolar World Congress 2017
Country/TerritoryUnited Arab Emirates
CityAbu Dhabi


  • Solar heating plants
  • Seasonal water pit thermal storages (PTES)
  • Experimental investigations
  • Computational fluid dynamics (CFD)
  • Thermal stratification


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