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Operation of a ground thermal energy storage supplied by different sources in a low-temperature district heating network

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  • Dolna, Oktawia

Abstract

The article concerns a theoretical investigation on the ground thermal energy storage (GTES) applied to a low-temperature district heating (LTDH) distribution network. A general formula describing the time-dependent GTES temperature variation was introduced. The highest values of the GTES operating parameters were obtained for the second model. The ground temperature of a varying liquid fraction content (0, 0.1, 0.2) reached a value of 33.42 °C, 33.29 °C and 33.07 °C, respectively. After the GTES was applied, the heat flux transferred to the end-users increased by 14.5 kW. Deactivation of the GTES caused that the heat flux transferred to the consumers had a constant value of 149.5 kW. The LTDH heat supplier was able to provide the heat flux which decreased in time by 8.26% when the GTES was activated. The impact of the GTES insulation on the ground temperature was studied. The results have shown that reducing the insulation by 1/3 results in the GTES temperature decrease by about 3%. It was also found out that inappropriate GTES operation mode may cause larger thermal depletion of the GTES.

Suggested Citation

  • Dolna, Oktawia, 2021. "Operation of a ground thermal energy storage supplied by different sources in a low-temperature district heating network," Renewable Energy, Elsevier, vol. 180(C), pages 586-604.
    • Handle: RePEc:eee:renene:v:180:y:2021:i:c:p:586-604
    DOI: 10.1016/j.renene.2021.08.037
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    References listed on IDEAS

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    1. Dolna, Oktawia & Mikielewicz, Jarosław, 2020. "The ground impact on the ultra-low- and low-temperature district heating operation," Renewable Energy, Elsevier, vol. 146(C), pages 1232-1241.
    2. Hansen, C.H. & Gudmundsson, O. & Detlefsen, N., 2019. "Cost efficiency of district heating for low energy buildings of the future," Energy, Elsevier, vol. 177(C), pages 77-86.
    3. Ismail, Kamal A.R. & Leal, Janaína F.B. & Zanardi, Maurício A., 1997. "Models of liquid storage tanks," Energy, Elsevier, vol. 22(8), pages 805-815.
    4. Brand, Marek & Thorsen, Jan Eric & Svendsen, Svend, 2012. "Numerical modelling and experimental measurements for a low-temperature district heating substation for instantaneous preparation of DHW with respect to service pipes," Energy, Elsevier, vol. 41(1), pages 392-400.
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    1. Ushamah, Hafiz Muhammad & Ahmed, Naveed & Elfeky, K.E. & Mahmood, Mariam & Qaisrani, Mumtaz A. & Waqas, Adeel & Zhang, Qian, 2022. "Techno-economic analysis of a hybrid district heating with borehole thermal storage for various solar collectors and climate zones in Pakistan," Renewable Energy, Elsevier, vol. 199(C), pages 1639-1656.

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