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A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers

Author

Listed:
  • Ingen Perser

    (Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada)

  • Ian Alistair Frigaard

    (Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada
    Department of Mathematics, University of British Columbia, 1984 Mathematics Road, Vancouver, BC V6T 1Z2, Canada)

Abstract

Utilizing a deep Borehole Heat Exchanger (BHE) has been recognized as a clean, renewable, low-carbon-emission, and sustainable way for heating of residential buildings and greenhouses. In this study, the long-term performance of horizontal deep BHE in intermittent mode is scrutinized. In this regard, to predict the transient heat transfer process in the deep BHEs, a mathematical model is developed and then verified by using the experimental results. The effect various key parameters including flow rate of circulating fluid, undisturbed ground temperature, inlet fluid temperature, and ground thermal conductivity on the thermal performance of deep BHE in continuous and intermittent mode is studied. According to the results, increasing the flow rate of circulating fluid, undisturbed ground temperature, and ground thermal conductivity is favorable for heat extraction rate. Moreover, the effect of three specific parameters for intermittent operation including periodic time interval, flow rate ratio, and recovery period ratio on the long-term performance of horizontal deep BHE are scrutinized. Based on the results, by decreasing the periodic time interval and increasing the flow rate ratio, the mean heat extraction rate in the period of 30 years is increased and the mean borehole’s wall temperature is decreased. Furthermore, by increasing the recovery period ratio, the heat extraction rate increases significantly while the total extracted energy decreases.

Suggested Citation

  • Ingen Perser & Ian Alistair Frigaard, 2022. "A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers," Energies, MDPI, vol. 15(1), pages 1-27, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:1:p:307-:d:716608
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    References listed on IDEAS

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    1. Habibi, Mohammad & Aligolzadeh, Farid & Hakkaki-Fard, Ali, 2020. "A techno-economic analysis of geothermal ejector cooling system," Energy, Elsevier, vol. 193(C).
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    Cited by:

    1. Brown, Christopher S. & Kolo, Isa & Falcone, Gioia & Banks, David, 2023. "Investigating scalability of deep borehole heat exchangers: Numerical modelling of arrays with varied modes of operation," Renewable Energy, Elsevier, vol. 202(C), pages 442-452.

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