Test Construction of Cast-in-Place Concrete Energy Pile in Dredged and Reclaimed Ground
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 1
Abstract
This study evaluates the feasibility of energy piles equipped with a large-diameter drilled shaft under unfavorable ground conditions. The cast-in-place concrete energy pile was constructed at a test bed in dredged and reclaimed ground in which a confined aquifer exists. Two different configurations of heat exchange pipes (W-shape and S-shape) were designed on each side of the energy pile to compare their thermal performance. The drilled shaft reaches to a depth of 60 m whereas the heat exchange pipes are inserted to about 30 m below the ground surface. In a comparison of constructability, the S-shape heat exchanger resulted in faster installation by about 50% over the W-shape, which implies that the S-shape pipe may provide better constructability for the given construction conditions. A series of in situ thermal response tests (TRTs) were performed to compare the thermal performance of each heat exchanger. The relative heat exchange efficiency (eff) of the W-shape and the S-shape heat exchangers were determined to be 19.15 and 18.88, respectively, which means that the two different types of heat exchange pipe configurations practically yield similar thermal performance. One of the TRTs conducted in the test bed was simulated by a computational fluid dynamics (CFD) numerical model to verify the feasibility of adopting TRTs for energy piles, which reproduces quite well the TRT experimental results.
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Acknowledgments
This research was supported partially by the SAMSUNG C&T Corporation and by the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government Ministry of Knowledge Economy (Grant No. 20113030110010).
References
Adam, D. (2009). “Tunnels and foundations as energy sources: Practical applications in Austria.” Deep foundations on bored and auger piles, Taylor & Francis Group, London, 337–342.
Brandl, H. (2006). “Energy foundation and other thermo-active ground structures.” Geotechnique, 56(2), 81–122.
Brandl, H. (2009). “Energy piles concepts.” Deep foundations on bored and auger piles, Taylor & Francis Group, London, 77–95.
Bourne-Webb, P. J., Amatya, B., Soga, K., Amis, T., Davidson, C., and Payne, P. (2009). “Energy pile test at Lambeth College, London: Geotechnical and thermodynamic aspects of pile response to heat cycles.” Geotechnique, 59(3), 237–248.
Carlslaw, S. H., and Jaeger, J. C. (1993). Conduction of heat in solids, 2nd Ed., Claremore Press, Oxford, U.K.
Clauser, C., and Hugenges, E. (1995). “Thermal conductivity of rocks and minerals.” Handbook of rock physics and phase relations, T. J. Ahrens, ed., AUG, Washington, DC, 105–126.
Cui, P., Li, X., Man, Y., and Fang, Z. (2011). “Heat transfer analysis of pile geothermal heat exchangers with spiral coils.” Appl. Energy, 88(11), 4113–4119.
Fluent [Computer software]. Canonsburg, PA, Ansys.
Gao, J., Zhang, X., Liu, J., Li, K., and Yang, J. (2008a). “Numerical and experimental assessment of thermal performance of vertical energy pile: An application.” Appl. Energy, 85(10), 901–910.
Gao, J., Zhang, X., Liu, J., Li, K., and Yang, J. (2008b). “Thermal performance and ground temperature of vertical pile-foundation heat exchangers: A case study.” Appl. Therm. Eng., 28(17–18), 2295–2304.
Hamada, Y., Saitoh, H., Nakamura, M., Kubota, H., and Ochifuji, K. (2007). “Field performance of an energy pile system for space heating.” Energy Build., 39(5), 517–524.
Jun, L., Zhang, X., Gao, J., and Yang, J. (2009). “Evaluation of heat exchange rate of GHE in geothermal heat pump system.” Renew. Energy, 34(12), 2898–2904.
Kersten, M. S. (1949). “Thermal properties of soil.” Bull. Univ. Minn. Inst. Technol., 52(21), 1–225.
Knellwolf, C., Peron, H., and Laloui, L. (2011). “Geotechnical analysis of heat exchanger piles.” J. Geotech. Geoenviron. Eng., 890–902.
Laloui, L., Moreni, M., and Vulliet, L. (2003). “Behavior of a dual-purpose pile as foundation and heat exchanger.” Can. Geotech. J., 40(2), 388–402.
Laloui, L., Nuth, M., and Vulliet, L. (2006). “Experimental and numerical investigations of the behavior of a heat exchanger pile.” Int. J. Numer. Anal. Methods Geomech., 30(8), 763–781.
Launder, B. E., and Spalding, D. B. (1972). Lectures in mathematical models of turbulence, Academic Press, London.
Li, X., Chen, Y., Chen, Z., and Zhao, J. (2006). “Thermal performances of different types of underground heat exchangers.” Energy Build., 38(5), 543–547.
Man, L., Yang, H., Diao, N., Liu, J., and Fang, Z. (2010). “A new model and analytical solutions for borehole and pile ground heat exchangers.” Int. J. Heat Mass Transfer, 53(13–14), 2593–2601.
Markiewicz, R. (2004). “Numerische und experimentelle Untersuchungen zur Nutzung von geothermischer Energie mittels erdberührter Bauteile und Neuentwicklungen für den Tunnelbau.” Ph.D. thesis, Technical Univ. of Vienna, Austria.
Min, S., Lee, C., Koh, H., Yoo, J., Jung, K., and Choi, H. (2011). “Relative heat exchange rate for design of energy pile.” Proc., Asia-Pacific Forum on Renewable Energy 2011, AFORE2011, Korean Society for New and Renewable Energy (KSNRE), Seoul, Korea.
Mogenson, P. (1983). “Fluid to duct wall heat transfer in duct heat storages.” Proc., Int. Conf. on Subsurface Heat Storage in Theory and Practice, Swedish Council for Building Research, Stockholm, Sweden, 652–657.
Morino, K., and Oka, T. (1994). “Study on heat exchanged in soil by circulating water in a steel pile.” Energy Build., 21(1), 65–78.
Nam, Y., Ooka, R., and Hwang, S. (2008). “Development of a numerical model to predict heat exchange rate for a ground source heat pump system.” Energy Build., 40(12), 2113–2140.
Pahud, D., and Hubbuck, M. (2007). “Measured thermal performances of the energy pile system of the duck midfield at Zurick airport.” Proc., European Geothermal Congress 2007, European Renewable Energy Council (EREC), 1–7.
Sharqawy, M. H., Mokheimer, E. M., Habib, M. A., Badr, H. M., Said, N. A., and Al-Shayea, S. A. (2009). “Energy, exergy and uncertainty analyses of the thermal response test for a ground heat exchanger.” Int. J. Energy Res., 33(6), 582–592.
U.S. EPA. (1993). “Space conditioning: The next frontier, office of air and radiation.”, Energy Protection Agency, Washington, DC.
Wagner, R., and Clauser, C. (2005). “Evaluating thermal response tests using parameter estimation for thermal conductivity and thermal capacity.” J. Geophys. Eng., 2(4), 349–356.
Wood, C. J., Liu, H., and Riffat, S. B. (2009). “Use of energy piles in a residential building, and effects on ground temperature and heat pump efficiency.” Geotechnique, 59(3), 287–290.
Information & Authors
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Published In
Journal of Performance of Constructed Facilities
Volume 29 • Issue 1 • February 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 1, 2012
Accepted: Feb 12, 2013
Published online: Feb 14, 2013
Discussion open until: Nov 27, 2014
Published in print: Feb 1, 2015
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