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Evaluation on Cooling Performance of Ground Source Heat Pump System Equipped with Steel-pipe Civil Structures

강관 토목구조물이 설치된 지열 히트펌프 시스템의 냉방 성능 평가

  • Seokjae Lee (Department of Civil Engineering, Kunsan National University) ;
  • Jeonghun Yang (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Hangseok Choi (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 이석재 (군산대학교 토목공학과) ;
  • 양정훈 (고려대학교 건축사회환경공학부) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Received : 2023.08.14
  • Accepted : 2023.08.31
  • Published : 2023.09.01

Abstract

Steel-pipe civil structures, including steel-pipe energy piles and cast-in-place piles (CIPs), utilize steel pipes as their primary reinforcements. These steel pipes facilitate the circulation of a working fluid through their annular crosssection, enabling heat exchange with the surrounding ground formation. In this study, the cooling performance of a ground source heat pump (GSHP) system that incorporated steel-pipe civil structures was investigated to assess their applicability. First of all, the thermal performance test was conducted with steel-pipe CIPs to evaluate the average heat exchange amount. Subsequently, a GSHP system was designed and implemented within an office container, considering the various types of steel-pipe civil structures. During the performance evaluation tests, parameters such as the coefficient of performance (COP) and entering water temperature (EWT) were closely monitored. The outcomes indicated an average COP of 3.74 for the GSHP system and the EWT remained relatively stable throughout the tests. Consequently, the GSPH system demonstrated its capability to consistently provide a sufficient heat source, even during periods of high cooling thermal demand, by utilzing the steel-pipe civil structures.

Keywords

Acknowledgement

이 논문은 2023년도 군산대학교 신임교수 연구비 지원과 한국연구재단의 지원(NRF-2022R1C1C2003462)에 의하여 연구되었음.

References

  1. Boennec, O., 2008, Shallow ground energy systems, Proceedings of the Institution of Civil Engineers-Energy, Vol. 161, No. 2, pp. 57-61. https://doi.org/10.1680/ener.2008.161.2.57
  2. Kupiec, K., Larwa, B., and Gwadera, M., 2015, Heat transfer in horizontal ground heat exchangers, Applied Thermal Engineering, Vol. 75, pp. 270-276.
  3. Shi, Y., Xu, F., Li, X., Lei, Z., Cui, Q., and Zhang, Y., 2022, Comparison of influence factors on horizontal ground heat exchanger performance through numerical simulation and gray correlation analysis, Applied Thermal Engineering, Vol. 213, 118756.
  4. Lee, S., Park, S., Kang, M., Oh, K., and Choi, H., 2022, Effect of tube-in-tube configuration on thermal performance of coaxial-type ground heat exchanger, Renewable Energy, Vol. 197, pp. 518-527. https://doi.org/10.1016/j.renene.2022.07.088
  5. Lee, C., Park, M., Nguyen, T. B., Sohn, B., Choi, J. M., and Choi, H., 2012, Performance evaluation of closedloop vertical ground heat exchangers by conducting in-situ thermal response tests, Renewable Energy, Vol. 42, pp. 77-83. https://doi.org/10.1016/j.renene.2011.09.013
  6. Park, S., Lee, D., Choi, H. J., Jung, K., and Choi, H., 2015, Relative constructability and thermal performance of cast-in-place concrete energy pile: Coil-type GHEX (ground heat exchanger), Energy, Vol. 81, pp. 56-66. https://doi.org/10.1016/j.energy.2014.08.012
  7. Lee, S., Park, S., Won, J. and Choi, H., 2021, Influential factors on thermal performance of energy slabs equipped with an insulation layer, Renewable Energy, Vol. 174, pp. 823-834. https://doi.org/10.1016/j.renene.2021.04.090
  8. Barla, M., Di Donna, A., and Insana, A., 2019, A novel real-scale experimental prototype of energy tunnel. Tunnelling and Underground Space Technology, Vol. 87, pp. 1-14. https://doi.org/10.1016/j.tust.2019.01.024
  9. Di Donna, A., Cecinato, F., Loveridge, F., & Barla, M. (2017). Energy performance of diaphragm walls used as heat exchangers. Proceedings of the Institution of Civil Engineers-Geotechnical Engineering, 170(3), 232-245. https://doi.org/10.1680/jgeen.16.00092
  10. Lee, S., Park, S., Kim, D., Ahn, D., and Choi, H., 2021, Dual performance of novel steel pipe heat exchangers equipped in cast-in-place energy pile, Energy and Buildings, Vol. 234, pp. 110725.
  11. Kim, M., 2021, Evaluation of applicability of steel tubes as replacements of steel bars for reinforcement of drilled shafts, PhD Thesis, Hanyang University.
  12. Lee, S., Han, T. H., Park, S., Hwang, C., and Choi, H., 2023, Thermal performance design and analysis method for energy cast-in-place piles (E-CIPs) installed in diaphragm walls, Energy and Buildings, Vol. 296, 113372.
  13. Lee, S., and Choi, H., 2022, Evaluation of Applicability of Steel-pipe Energy Piles Through Thermal Performance Test (TPT). Korean Society for Geothermal and Hydrothermal Energy, Vol. 18, No. 2, pp. 1-9.
  14. Aresti, L., Christodoulides, P., and Florides, G. A., 2021, An investigation on the environmental impact of various Ground Heat Exchangers configurations. Renewable Energy, Vol. 171, pp. 592-605. https://doi.org/10.1016/j.renene.2021.02.120
  15. Curtis, R., Pine, T., and Wickins, C., 2013, Development of new ground loop sizing tools for domestic GSHP installations in the UK. In The Proceedings of European Geothermal Congress, pp. 1-10.
  16. Spitler, J. D., 2000, GLHEPRO: a design tool for commercial building ground loop heat exchangers.
  17. Oh, K., Lee, S., Park, S., Han, S. I. and Choi, H., 2019, Field experiment on heat exchange performance of various coaxial-type ground heat exchangers considering construction conditions, Renewable Energy, Vol. 144, pp. 84-96. https://doi.org/10.1016/j.renene.2018.10.078
  18. House, L. E., 2016, Heating and Cooling Performance Analysis of Ground Source Heat Pump System in Low Energy House, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 28, No. 10, pp. 387-393. https://doi.org/10.6110/KJACR.2016.28.10.387