Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance Prediction of Geothermal Heat Pump(GHP) System with Energy Piles Using Simulation Approach

시뮬레이션을 통한 에너지파일 적용 지열 히트펌프 시스템의 성능 예측

  • Sohn, Byong-Hu (Green Building Research Division, Korea Institute of Construction Technology) ;
  • Choi, Jong-Min (Department of Mechanical Engineering, Hanbat National University)
  • 손병후 (한국건설기술연구원 그린빌딩연구실) ;
  • 최종민 (국립 한밭대학교 기계공학과)
  • Received : 2011.11.30
  • Published : 2012.02.10
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Abstract

The aim of this study is to evaluate the performance of the GHP system with 150 energy piles for a commercial building. In order to demonstrate the feasibility of a sustainable performance of the system, simulations were conducted over 1-year and 20-year periods, respectively. The 1-year simulation results showed that the maximum and minimum temperatures of brine returning from the energy piles were $23.80^{\circ}C$ and $7.90^{\circ}C$, which were in a range of design target temperatures. In addition, after 20 years' operation, these returning temperatures decreased slowly to $23.05^{\circ}C$ and $6.98^{\circ}C$, and finally reached to stable state. The results also showed that the energy piles injected heat of 65.6 MWh to the ground and extracted heat of 96.0 MWh from the ground, respectively. Also, it is expected this GHP system with energy piles can operate with average SPF of more than 4.15 for long term.

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References

  1. Brandl, H., 2006, Energy foundations and other thermo-active ground structures, Geotechnique, Vol. 56, No. 2, pp. 81-122. https://doi.org/10.1680/geot.2006.56.2.81
  2. Gao, J., Zhang, X., Liu, J., Li, S. K., and Yang, J., 2008, Thermal performance and ground temperature of vertical pile-foundation heat exchangers:a case study, Applied Thermal Engineering, Vol. 28, pp. 2295-2304. https://doi.org/10.1016/j.applthermaleng.2008.01.013
  3. Hamada, Y., Saitoh, H., Nakamura, M., Kubota, H., and Ochifuji, K., 2007, Field performance of an energy pile system for space heating, Energy and Buildings, Vol. 39, pp. 517-524. https://doi.org/10.1016/j.enbuild.2006.09.006
  4. Laloui, L., Nuth, M., and Vulliet, L., 2006, Experimental and numerical investigations of the behaviour of a heat exchanger pile, Int. J. for Numerical and Analytical Methods in Geomechanics, Vol. 30, pp. 763-781. https://doi.org/10.1002/nag.499
  5. Katsura, T., Nagano, K., and Takeda, S., 2008, Method of calculation of the ground temperature for multiple ground heat exchangers, Applied Thermal Engineering, Vol. 28, pp. 1995- 2004. https://doi.org/10.1016/j.applthermaleng.2007.12.013
  6. Wood, C. J., Liu, H., and Riffat, S. B., 2010, An investigation of the heat pump performance and ground temperature of a piled foundation heat exchanger system for a residential building, Energy, Vol. 35, pp. 4932-4940. https://doi.org/10.1016/j.energy.2010.08.032
  7. Zhang, X., Liu, J., Gao, J., and Li, K., 2008, Research on ground temperature restoration characteristics of large-scale ground source heat pump system, International Journal of Air-Conditioning and Refrigeration, Vol. 16, No. 4, pp. 109-116.
  8. Man, Y., Yang, H., Diao, N., Liu, J., and Fang, Z., 2010, A new model and analytical solutions for borehole and pile ground heat exchangers, International Journal of Heat and Mass Transfer, Vol. 53, pp. 2593-2601. https://doi.org/10.1016/j.ijheatmasstransfer.2010.03.001
  9. Yoo, G. S., Park, I. M., Choi, J. H., and Shin, H. J., 2009, Performance evaluation of large borehole ground-loop heat exchanger, Proceedings of the SAREK, pp. 58-63.
  10. Yu, H. K., 2008, Development and performance evaluation of ground heat exchanger utilizing PHC pile foundation of building, Journal of the Korean Solar Energy Society, Vol. 28, No. 5, pp. 56-64.
  11. Baek, S. K., An, H. J., and Lim, S. K., 2007, Development of ground heat exchangers installed in building foundation, Proceedings of the SAREK, pp. 277-282.
  12. Baek, S. K. and An, H. J., 2004, A study on heat transfer or pile heat exchangers, Proceedings of the SAREK, pp. 1329-1333.
  13. Pahud, D., Fromentin, A., and Hadorn, J. C., 1996, The duct ground heat storage model (DST) for TRNSYS used for the simulation of heat exchanger piles-user manual, Swiss Federal Institute of Technology in Lausanne, pp. 1-16.