Browse > Article
http://dx.doi.org/10.7843/kgs.2013.29.8.37

Study on Thermal Behavior and Design Method for Coil-type PHC Energy Pile  

Park, Sangwoo (Graduate Student, School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Sohn, Jeong-Rak (Korea Land & Housing Corporation)
Park, Yong-Boo (Korea Land & Housing Corporation)
Ryu, Hyung-Kyou (Technology Research&Development Institute, DAELIM Industrial Corporation)
Choi, Hangseok (Graduate Student, School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.8, 2013 , pp. 37-51 More about this Journal
Abstract
An energy pile encases heat exchange pipes to exchange thermal energy with the surrounding ground formation by circulating working fluid through the pipes. An energy pile has many advantages in terms of economic feasibility and constructability over conventional Ground Heat Exchangers (GHEXs). In this paper, a coil-type PHC energy pile was constructed in a test bed and its thermal performance was experimentally and numerically evaluated to make a preliminary design. An in-situ thermal response test (TRT) was performed on the coil-type PHC energy pile and its results were compared with the solid cylinder source model presented by Man et al. (2010). In addition, a CFD numerical analysis using FLUNET was carried out to back-analyze the thermal conductivity of the ground formation from the Ttype PHC energy RT result. To study effects of a coil pitch of the coil-type heat exchange pipe, a thermal interference between the heat exchange pipes in PHC energy piles was parametrically studied by performing the CFD numerical analysis, then the effect of the coil pitch on thermal performance and efficiency of heat exchange were evaluated. Finally, an equivalent heat exchange efficiency factor for the coil-type PHC energy pile in comparison with a common multiple U-type PHC energy pile was obtained to facilitate a preliminary design method for the coil-type PHC energy pile by adopting the PILESIM2 program.
Keywords
Coil-type PHC energy pile; Equivalent heat exchange efficiency factor; Heat exchange pipe; Solid cylinder source model; Energy pile design;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Nam, Y., Ooka, R., and Hwang, S. (2008), "Development of a numerical model to predict heat exchange rates for a ground source heat pump system", Energy and Building, Vol.40, pp.2113-2140.
2 Ryu, 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.   과학기술학회마을
3 Yoon, S., Go, G-H, Park, H-K, Park, S., Lee, S-R, Cho, K-J, and Song, C-Y (2012), "Thermal conductivity estimate of ground using energy piles", Journal of Korea Society of Geothermal Energy Engineers, Vol.8, No.4, pp.8-16.   과학기술학회마을
4 Department Of Energy, DOE (2001), "Ground-source heat pumps applied to federal facilities-second edition", Federal Energy Management Program, DOE/EE-0245(PNNL-13534), US Department of Energy
5 Jun, L., Zhang, X., Gao, J., and Yang, J. (2009), "Evaluation of heat exchange rate of GHW in geothermal heat pump system", Renewable Energy, Vol.34, pp.2898-2904.   DOI   ScienceOn
6 Yavuzturk, C., Spitler, J. D., and Rees, S. J. (1999), "A transient two-dimensional finite volume model for simulation of vertical U-tube ground heat exchanger", ASHRAE Transactions, Vol.105, No.2, pp.465-474.
7 Park, Y-B, Park, J-B, and Lim, H-S (2007), "Construction method of ground heat exchanger using energy pile in ground source heat system", KSCE magazine, Vol.55, No.7, pp.41-46.
8 Salomone, L. A. and Marlowe, J. I. (1989), "Soil and rock classification according to thermal conductivity : Design of groundcoupled heat pump systems : Final report", Electric Power Research Inst.(EPRI), EPRI-CU-6482.
9 Sharqawy, M. H., Mokheimer, E. M., Habib, M. A., Badr, H. M., Said, N. A., and Al-Shayea, S. A. (2009), "Energy, energy and uncertainty analyses of the thermal response test for a ground heat exchanger", International Journal of Energy Research, Vol.33, pp. 582-592.   DOI   ScienceOn
10 Wagner, R. and Clauser, C. (2005), "Evaluating thermal response tests using parameter estimation for thermal conductivity and thermal capacity", Journal of Geophysics and Engineering, Vol.2, pp.349-356.   DOI   ScienceOn
11 Pahud, D. and Hubbuck, M. (2007), "Measured thermal performances of the energy pile system of the duck midfield as Zurick Airport", Proceedings European Geothermal Congress 2007, Unterhaching, Germany, 30 May-1 June.
12 Jeong, S., Song, J., Min, H., and Lee, S. (2010), "Thermal influence factors of energy pile", Journal of the Korean Society of Civil Engineers (KSCE), Vol.30, No.6C, pp.231-239.
13 Man, L., Yang, H., Diao, N., Liu, J., and Fang, J. (2010), "A new model and analytical solutions for borehole and pile ground heat exchangers", International Journal of Heat and Mass Transfer, Vol.53, pp.2593-2061.   DOI   ScienceOn
14 Kavanaugh, S.P. and Rafferty, K. (1997), "Ground-Source Heat Pumps - Design of Geothermal Systems for Commercial and Institutional Buildings", American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), Atlanta
15 Lee, C. (2012), Performance of ground heat exchangers for civil infrastructures, Ph.D. Thesis, Korea University, Korea.
16 Lee, C., Park, M., Min, S., Choi, H., and Sohn. B. (2010), "Evaluation of Performance of Grouts and Pipe sections for Close-Loop Vertical Ground Heat Exchanger by In-situ Thermal Response test", Jounral of Korean Geotechnical Society (KGS), Vol.26, No.7, pp.93-106.   과학기술학회마을
17 Min, S., Park, S., Koh, H., Yoo, J., Jung, K., and Choi, H. (2012), "Study on equivalent heat exchange efficiency and design method for cast-in-place energy pile", Proceedings of 2012 KGS Spring Conference, Korean Geotechnical Society (KGS), pp.655-666.
18 Nam, Y., Hwang, S., and Ooka, R. (2007), "Geothermal heat pump system using foundation pile structures", Journal of Korea Society of Geothermal Energy Engineers, Vol.3, No.1, pp.51-60.
19 Nam, Y. and Ooka, R. (2011), "Development of potential map for ground and groundwater heat pump systems and the application to tokyo", Energy and Building, Vol.43, pp.677-685.   DOI   ScienceOn
20 Ingersoll, L. R., Zobel, O. J., and Ingersoll, A. C. (1954), Heat Conduction with engineering and geological application, McGraw-Hill, New York.
21 Brandl, H. (2006), "Energy foundation and other thermo-active ground structures", Geotechnique, Vol.56, No.2, pp.81-122.   DOI   ScienceOn
22 민선홍 (2011), 현장타설 에너지파일 설계를 위한 등가 열교환율에 관한 연구, 석사학위논문, 고려대학교.
23 신에너지 및 재생에너지 개발.이용.보급 촉진법, 법률 제 10445호.
24 Baek, S-K (2004), Study on ground-coupled heat pump system using hollow piles, Ph.D. Thesis, Busan University, Korea.
25 Carslaw, S. H. and Jaeger, J. C. (1959), Conduction of heat in solids, 2nd ed., Oxford Science Publication.
26 Cui, P., Li, X., Man, Y., and Fang, Z. (2011), "Heat transfer analysis of pile geothermal heat exchangers with spiral coils", Applied Energy, Vol.88, No.11, pp.4113-4119.   DOI   ScienceOn
27 Engineering tool box (2005), Engineeringtoolbox.com
28 Environmental Protection Agency, EPA (1993), "Space Conditioning : The Next Frontier, Office of Air and Radiation", 403-R-93-0044 (4/93), Energy Protection Agency, Washington D.C.
29 Gao, J., Zhang, X., Liu, J., Li, K., and Yang, J. (2008), "Numerical and experimental assessment of thermal performance of vertical energy piles", An application, Applied Energy, Vol.85, pp.901-910.   DOI   ScienceOn