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Thermal charging of boreholes

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  • Lhendup, Tshewang
  • Aye, Lu
  • Fuller, Robert James

Abstract

This paper presents experimental study of thermal charging the boreholes that are used for inter-seasonal thermal storage of heat and coolth integrated with ground-coupled heat pump and unglazed solar collectors. After 180 days of thermal charging, it was observed that the temperature of the ground at 21 m depth and 1 m distance from the borehole had increased by 2.5 °C. The unglazed collectors are able to collect heat for charging the heat storage borehole at an average of 43.9 MJ day−1. The system is able to charge borehole at an average heat transfer rate of 57 W m−1. A comparison of the experimental results with the simulated results of a TRNSYS model of the system showed a good agreement. The mean efficiency of the unglazed solar collector during 180 days charging operation was found to be 30% and the mean efficiency of the system was found to be 38%.

Suggested Citation

  • Lhendup, Tshewang & Aye, Lu & Fuller, Robert James, 2014. "Thermal charging of boreholes," Renewable Energy, Elsevier, vol. 67(C), pages 165-172.
    • Handle: RePEc:eee:renene:v:67:y:2014:i:c:p:165-172
    DOI: 10.1016/j.renene.2013.11.045
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    References listed on IDEAS

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    1. Bakirci, Kadir & Ozyurt, Omer & Comakli, Kemal & Comakli, Omer, 2011. "Energy analysis of a solar-ground source heat pump system with vertical closed-loop for heating applications," Energy, Elsevier, vol. 36(5), pages 3224-3232.
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    1. Gao, Jiajia & Li, Anbang & Xu, Xinhua & Gang, Wenjie & Yan, Tian, 2018. "Ground heat exchangers: Applications, technology integration and potentials for zero energy buildings," Renewable Energy, Elsevier, vol. 128(PA), pages 337-349.
    2. 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.
    3. Fong, Matthew & Alzoubi, Mahmoud A. & Kurnia, Jundika C. & Sasmito, Agus P., 2019. "On the performance of ground coupled seasonal thermal energy storage for heating and cooling: A Canadian context," Applied Energy, Elsevier, vol. 250(C), pages 593-604.
    4. Nilsson, Emil & Rohdin, Patrik, 2019. "Performance evaluation of an industrial borehole thermal energy storage (BTES) project – Experiences from the first seven years of operation," Renewable Energy, Elsevier, vol. 143(C), pages 1022-1034.
    5. Shah, Sheikh Khaleduzzaman & Aye, Lu & Rismanchi, Behzad, 2018. "Seasonal thermal energy storage system for cold climate zones: A review of recent developments," Renewable and Sustainable Energy Reviews, Elsevier, vol. 97(C), pages 38-49.
    6. Shah, Sheikh Khaleduzzaman & Aye, Lu & Rismanchi, Behzad, 2022. "Validations of a double U-tube borehole model and a seasonal solar thermal energy storage system model," Renewable Energy, Elsevier, vol. 201(P1), pages 462-485.
    7. Emil Nilsson & Patrik Rohdin, 2019. "Empirical Validation and Numerical Predictions of an Industrial Borehole Thermal Energy Storage System," Energies, MDPI, vol. 12(12), pages 1-20, June.
    8. Xia, Lei & Ma, Zhenjun & Kokogiannakis, Georgios & Wang, Zhihua & Wang, Shugang, 2018. "A model-based design optimization strategy for ground source heat pump systems with integrated photovoltaic thermal collectors," Applied Energy, Elsevier, vol. 214(C), pages 178-190.

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