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The effect of borefield geometry and ground thermal load profile on hourly thermal response of geothermal heat pump systems

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  • Fossa, Marco
  • Minchio, Fabio

Abstract

Vertical BHE (borehole heat exchangers) are a common solution for GCHP applications (ground coupled heat pump). Correct BHE design and sizing are mandatory to either assure long term GCHP performance or reduce the payback period. Most models for performing the time varying analysis of complex borefields are based on the solution of the conduction equation, through the calculation of proper temperature response factors. The DST (Duct Storage Model) is often referred as the benchmark analysis tool, even if it is based on a simplified description of the borefield geometry. In this paper, DST predictions, in terms of hourly fluid temperatures along 20 years, are compared with the corresponding results obtained by implementing the MLAA (Multiple Aggregation Algorithm) approach by Bernier et al. into a model able to employ suitable g-functions generated starting from the Finite Line Source solution. This paper discusses some aspects of the improvements here introduced to the original MLAA method. The study is devoted to the comparison between the predicted fluid temperature values by the DST and MLAA models, with special attention to the influence of the BHE geometry (matrix like vs in line configurations) and to the shape of the yearly hourly load profiles (balanced vs unbalanced ground loads).

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  • Fossa, Marco & Minchio, Fabio, 2013. "The effect of borefield geometry and ground thermal load profile on hourly thermal response of geothermal heat pump systems," Energy, Elsevier, vol. 51(C), pages 323-329.
    • Handle: RePEc:eee:energy:v:51:y:2013:i:c:p:323-329
    DOI: 10.1016/j.energy.2012.12.043
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    1. Bayer, Peter & de Paly, Michael & Beck, Markus, 2014. "Strategic optimization of borehole heat exchanger field for seasonal geothermal heating and cooling," Applied Energy, Elsevier, vol. 136(C), pages 445-453.
    2. Badenes, Borja & Sanner, Burkhard & Mateo Pla, Miguel Ángel & Cuevas, José Manuel & Bartoli, Flavia & Ciardelli, Francesco & González, Rosa M. & Ghafar, Ali Nejad & Fontana, Patrick & Lemus Zuñiga, Le, 2020. "Development of advanced materials guided by numerical simulations to improve performance and cost-efficiency of borehole heat exchangers (BHEs)," Energy, Elsevier, vol. 201(C).
    3. Yong Li & Shibin Geng & Xu Han & Hua Zhang & Fusheng Peng, 2017. "Performance Evaluation of Borehole Heat Exchanger in Multilayered Subsurface," Sustainability, MDPI, vol. 9(3), pages 1-16, March.
    4. 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.
    5. Shibin Geng & Yong Li & Xu Han & Huiliang Lian & Hua Zhang, 2016. "Evaluation of Thermal Anomalies in Multi-Boreholes Field Considering the Effects of Groundwater Flow," Sustainability, MDPI, vol. 8(6), pages 1-19, June.
    6. Antonella Priarone & Federico Silenzi & Marco Fossa, 2020. "Modelling Heat Pumps with Variable EER and COP in EnergyPlus: A Case Study Applied to Ground Source and Heat Recovery Heat Pump Systems," Energies, MDPI, vol. 13(4), pages 1-22, February.
    7. Zanchini, E. & Lazzari, S., 2014. "New g-functions for the hourly simulation of double U-tube borehole heat exchanger fields," Energy, Elsevier, vol. 70(C), pages 444-455.
    8. Longo, L. & Colantoni, A. & Castellucci, S. & Carlini, M. & Vecchione, L. & Savuto, E. & Pallozzi, V. & Di Carlo, A. & Bocci, E. & Moneti, M. & Cocchi, S. & Boubaker, K., 2015. "DEA (data envelopment analysis)-assisted supporting measures for ground coupled heat pumps implementing in Italy: A case study," Energy, Elsevier, vol. 90(P2), pages 1967-1972.
    9. 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.
    10. Pouloupatis, Panayiotis D. & Tassou, Savvas A. & Christodoulides, Paul & Florides, Georgios A., 2017. "Parametric analysis of the factors affecting the efficiency of ground heat exchangers and design application aspects in Cyprus," Renewable Energy, Elsevier, vol. 103(C), pages 721-728.
    11. Cerfontaine, B. & Radioti, G. & Collin, F. & Charlier, R., 2016. "Formulation of a 1D finite element of heat exchanger for accurate modelling of the grouting behaviour: Application to cyclic thermal loading," Renewable Energy, Elsevier, vol. 96(PA), pages 65-79.
    12. 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.
    13. Seung-Min Lee & Seung-Hoon Park & Yong-Sung Jang & Eui-Jong Kim, 2021. "Proposition of Design Capacity of Borehole Heat Exchangers for Use in the Schematic-Design Stage," Energies, MDPI, vol. 14(4), pages 1-17, February.
    14. Jin, Guang & Li, Zheng & Guo, Shaopeng & Wu, Xuan & Wu, Wenfei & Zhang, Kai, 2020. "Thermal performance analysis of multiple borehole heat exchangers in multilayer geotechnical media," Energy, Elsevier, vol. 209(C).

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