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A hybrid reduced model for borehole heat exchangers over different time-scales and regions

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  • Kim, Eui-Jong
  • Bernier, Michel
  • Cauret, Odile
  • Roux, Jean-Jacques

Abstract

Accurate modeling of heat transfer in the ground and inside the borehole is crucial to correctly size and assess performance of ground coupled heat pump systems. The model proposed here uses a hybrid approach combining two techniques. First, the rapid transient behavior inside the borehole is handled numerically with a fine grid in combination with a model size reduction technique to reduce computation time. Secondly, the surrounding ground is modeled using modified g-functions. The resulting HR (hybrid reduced) model is implemented as a TRNSYS type using a load aggregation algorithm. Results show that differences between the proposed model and a well-known non-capacity model are within an acceptable range of the order of ±0.8 °C. The differences are partly attributed to the simplification methods. However, they are mainly due to the fact that the HR accounts for the thermal capacity in the borehole. In simulations over a heating season, the inclusion of borehole thermal capacity results in outlet fluid temperatures that can be up to 2 °C higher than when thermal capacity is not accounted for. In terms of computation time, the HR model is about 37 times faster than a complete hybrid model, but with almost no loss in accuracy.

Suggested Citation

  • Kim, Eui-Jong & Bernier, Michel & Cauret, Odile & Roux, Jean-Jacques, 2014. "A hybrid reduced model for borehole heat exchangers over different time-scales and regions," Energy, Elsevier, vol. 77(C), pages 318-326.
    • Handle: RePEc:eee:energy:v:77:y:2014:i:c:p:318-326
    DOI: 10.1016/j.energy.2014.08.091
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    References listed on IDEAS

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    1. Yang, H. & Cui, P. & Fang, Z., 2010. "Vertical-borehole ground-coupled heat pumps: A review of models and systems," Applied Energy, Elsevier, vol. 87(1), pages 16-27, January.
    2. Lee, C.K. & Lam, H.N., 2008. "Computer simulation of borehole ground heat exchangers for geothermal heat pump systems," Renewable Energy, Elsevier, vol. 33(6), pages 1286-1296.
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    Cited by:

    1. Yazhou Zhao & Zhibo Ma & Zhonghe Pang, 2020. "A Fast Simulation Approach to the Thermal Recovery Characteristics of Deep Borehole Heat Exchanger after Heat Extraction," Sustainability, MDPI, vol. 12(5), pages 1-27, March.
    2. Gan, Guohui, 2018. "Dynamic thermal performance of horizontal ground source heat pumps – The impact of coupled heat and moisture transfer," Energy, Elsevier, vol. 152(C), pages 877-887.
    3. Javadi, Hossein & Mousavi Ajarostaghi, Seyed Soheil & Rosen, Marc A. & Pourfallah, Mohsen, 2019. "Performance of ground heat exchangers: A comprehensive review of recent advances," Energy, Elsevier, vol. 178(C), pages 207-233.
    4. Han, Chanjuan & Ellett, Kevin M. & Naylor, Shawn & Yu, Xiong (Bill), 2017. "Influence of local geological data on the performance of horizontal ground-coupled heat pump system integrated with building thermal loads," Renewable Energy, Elsevier, vol. 113(C), pages 1046-1055.
    5. Somogyi, Viola & Sebestyén, Viktor & Nagy, Georgina, 2017. "Scientific achievements and regulation of shallow geothermal systems in six European countries – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P2), pages 934-952.
    6. Park, Seung-Hoon & Jang, Yong-Sung & Kim, Eui-Jong, 2018. "Using duct storage (DST) model for irregular arrangements of borehole heat exchangers," Energy, Elsevier, vol. 142(C), pages 851-861.
    7. Seung-Hoon Park & Eui-Jong Kim, 2019. "Optimal Sizing of Irregularly Arranged Boreholes Using Duct-Storage Model," Sustainability, MDPI, vol. 11(16), pages 1-18, August.
    8. 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.
    9. Rivera, Jaime A. & Blum, Philipp & Bayer, Peter, 2015. "Analytical simulation of groundwater flow and land surface effects on thermal plumes of borehole heat exchangers," Applied Energy, Elsevier, vol. 146(C), pages 421-433.
    10. Biglarian, Hassan & Abbaspour, Madjid & Saidi, Mohammad Hassan, 2018. "Evaluation of a transient borehole heat exchanger model in dynamic simulation of a ground source heat pump system," Energy, Elsevier, vol. 147(C), pages 81-93.

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