Geothermal Energy and Performance of Energy Pile Systems

Document Type: Original Article

Authors

1 M.Sc. of Geotechnical Engineering, Dept. of Civil Engineering, Qom University of Technology, Iran

2 Assistant Professor, Dept. of Civil Engineering, Faculty of Engineering, Qom University of Technology, Iran

Abstract

Geothermal energy is one of the most environmental-friendly and cost effective energy sources with potential to replace fossil fuels and help mitigate global warming. Recent technological progress, energy price variability, difficulty of oil and gas supply from foreign countries and the need to reduce fossil fuel deployment have made the exploitation of geothermal energy, especially for heating and cooling purposes, an attractive and viable energy alternative. The choice of the proper geothermal system (for heating or cooling) is essentially based on the need of cost containment and environmental constraints. Energy pile provides a mean to reduce energy consumption for space heating and cooling, while functioning as a support for superstructure. Despite of the environmental benefits of energy pile, some countries are still reluctant in implementing energy pile. This is because of knowledge gap on the influence of temperature cycles on energy pile ultimate and serviceability limit states. This paper reviews the geo exchanger and energy pile systems and highlights their applicability and efficiency as well as advantages and limits.

Keywords


[1]- Brandl, H., 2006, Energy foundations and other thermo-active ground structures, Geotechnique, 56(2), 81-122.
[2]- Energy and Geosciences Institute, University of Utah. Prepared by the U.S. Geothermal Industry for the Renewable Energy Task Force, 1997, Briefing on Geothermal Energy. Washington, D.C.
[3]- Rees,  S. J., 2016, 1 - An introduction to ground-source heat pump technology, in: Advance Ground-Source Heat Pump System, Woodhead Publishing, pp.1–25. doi:http://dx.doi.org/10.1016/B978-0-08-100311-4.00001-7.
[4]- Lund, J. W. and Boyd, T. L., 2016, Direct utilization of geothermal energy 2015 worldwide review, Geothermics. 60, 66–93.
[5]- Brandl, H., 2006, Energy foundations and other thermo-active ground structures, Geotechnique, 56, 81–122.
[6]- Knellwolf, C., Peron, H., and Laloui, L., 2011, Geotechnical analysis of heat exchanger piles, Journal of Geotechnical and Geoenvironmental Engineering, 137, 890–902.
[7]- Rees, S. W., Adjali, M. H., Zhou, Z., Davies, M. & Thomas, H. R., 2000, Ground heat transfer effects on thermal performance of earth contact structures, Renewable and Sustainable Energy Reviews, 4, 213-265.
[8]- Cekerevac, C. and Laloui, L., 2004, Experimental study of thermal effects on the mechanical behaviour of a clay, International Journal for Numerical and Analytical Methods in Geomechanics, 28(3), 209–228.
[9]- Baldi, G., Hueckel, T., and Pelegrini, R., 1998, Thermal volume changes of the mineral-water system in low-porosity clay soils, Canadian Geotechnical Journal, 25, 807–825.
[10]- Bourne-Webb, P., Amatya, B. & Soga, K., 2013, A framework for understanding energy pile behaviour, Proceedings of the Institution of Civil Engineers Geotechnical Engineering.
[11]- Murphy, K. D.,  McCartney, J. S., 2014, Thermal Borehole Shear Device, Geotechnical Testing Journal, 37. 20140009. doi:10.1520/GTJ20140009.
[12]- Laloui, L. and Di Donna, A., 2013, Energy Geostructures, Innovation in Underground Engineering. ISTE Ltd, London.
[13]- Suckling, T. P. and Smith, P. E. H., 2002, Environmentally friendly geothermal piles at Keble College, Oxford, UK. In: International Conference on piling and deep foundations, 445-452.
[14]- Dorn, J., 2008,  World Geothermal Energy Production Nearing Eruption (Aug. 2008), Earth Policy Institute, Retrieved December 20, 2008.
[15]- Dorn, J., 2008, World Geothermal Energy Production Nearing Eruption (Aug. 2008), Earth Policy Institute. Retrieved December 20, 2008.