DOI QR코드

DOI QR Code

Performance Prediction of Geothermal Heat Pump(GHP) System Using Cast-in-Place Energy Piles

현장 타설 에너지파일을 적용한 지열 히트펌프 시스템의 성능 예측

  • Sohn, Byonghu (Green Building Research Division, Korea Institute of Construction Technology) ;
  • Jung, Kyung-Sik (S-Tech Consulting Group) ;
  • Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 손병후 (한국건설기술연구원 그린빌딩연구실) ;
  • 정경식 ((주)에스텍컨설팅그룹) ;
  • 최항석 (고려대학교 건축사회환경공학과)
  • Received : 2012.10.31
  • Published : 2013.01.10

Abstract

The aim of this study is to evaluate the performance of the GHP system with 45 cast-in-place energy piles(CEP) for a commercial building. In order to demonstrate the feasibility of a sustainable performance of the system, transient 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 CEPs were $23.91^{\circ}C$ and $6.66^{\circ}C$, which were in a range of design target temperatures. In addition, after 20 years' operation, these returning temperatures decreased to $21.24^{\circ}C$ and $3.68^{\circ}C$, and finally reached to stable state. Annual average extraction heat of cast-in-place energy piles was 94.3 MWh and injection heat was 65.7 MWh from the 20 years of simulation results. Finally, it is expected this GHP system can operate with average heating SPF of more than 3.45 for long-term.

Keywords

References

  1. 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
  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. 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
  5. Bozis, D., Papakostas, K., and Kyriakis, N., 2011, On the evaluation of design parameters effects on the heat transfer efficiency of energy piles, Energy and Buildings, Vol. 43, pp. 1020-1029. https://doi.org/10.1016/j.enbuild.2010.12.028
  6. 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
  7. 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
  8. Li, M. and Lai, A., 2008, Heat-source solutions to heat conduction in anisotropic media with application to pile and borehole ground heat exchangers, Applied Energy, Vol. 96, pp. 451-458.
  9. 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
  10. 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.
  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. Sohn, B. and Choi, J. M., 2012, Performance prediction of geothermal heat pump(GHP) system with energy pile using simulation approach, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 24, No. 2, pp. 155-163. https://doi.org/10.6110/KJACR.2012.24.2.155
  13. Hwang, J. S. and Kim, K. S., 2012, Energy performance evaluation of a office building using DOE-2 simulation program, Proceedings of the KIAEBS 2009 Autumn Annual Conference, pp. 238-243.
  14. 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.

Cited by

  1. Feasibility Study of High-Efficiency Ground Heat Exchanger using Double U-tube through a Real-Scale Experiment vol.17, pp.4, 2017, https://doi.org/10.12813/kieae.2017.17.4.033