Numerical Analysis of Seasonal Heat Storage Systems of Alternative Geothermal Energy Pile Foundations

AbstractGeothermal energy pile foundations are sustainable, cost-effective alternative energy systems for heating and cooling needs of buildings. This paper presents the thermal modeling of two different configurations of energy pile foundations used for seasonal energy storage. Several two-dimensional (2D) transient analyses were carried out to find the optimum pile configuration and to obtain preliminary information about the heat exchange between the ground and the building. Two scenarios were modeled. In Scenario 1, a combination of long and short piles was simulated, while in Scenario 2 only long piles were considered. Long piles are structural piles and work as a heat exchanger throughout the year, while the nonstructural short piles operate only in the summer months to inject surplus solar energy into the ground. Simulation results show that in Scenario 1 the vertical temperature distribution was uneven, resulted in high temperatures at shallow depths (0–10 m) and near-freezing temperatures at grea...

[1]  Teppo Arola,et al.  The effect of urban heat islands on geothermal potential: examples from Quaternary aquifers in Finland , 2014, Hydrogeology Journal.

[2]  M. S. Kersten,et al.  Thermal Properties of Soils , 1952 .

[3]  K. Zhu,et al.  The geothermal potential of urban heat islands , 2010 .

[4]  H. Brandl.  Energy foundations and other thermo-active ground structures , 2006 .

[5]  H. Tuomenvirta,et al.  Annual and seasonal mean temperatures in Finland during the last 160 years based on gridded temperature data , 2010 .

[6]  Fabrice Dupray,et al.  Numerical analysis of seasonal heat storage in an energy pile foundation , 2014 .

[7]  Robert Horton,et al.  An Improved Model for Predicting Soil Thermal Conductivity from Water Content at Room Temperature , 2007 .

[8]  Orlando B. Andersland,et al.  An Introduction to Frozen Ground Engineering , 1994 .

[9]  O. Johansen.  Thermal Conductivity of Soils , 1977 .

[10]  A. Allen,et al.  Shallow gravel aquifers and the urban 'heat island' effect: a source of low enthalpy geothermal energy , 2003 .

[11]  H. Landsberg.  Urban Climate , 2011, Urban Ecology for Citizens and Planners.

[12]  D. Vries.  Thermal properties of soils , 1963 .

[13]  Fleur Loveridge.  The thermal performance of foundation piles used as heat exchangers in ground energy systems , 2012 .

[14]  Allan D. Woodbury,et al.  Urban heat island in the subsurface , 2007 .

[15]  J Sundberg,et al.  Thermal properties of soils and rocks , 1988 .

[16]  Lyesse Laloui,et al.  Understanding the behaviour of energy geo-structures , 2011 .

[17]  David Banks,et al.  Anthropogenic thermogeological ‘anomaly’ in Gateshead, Tyne and Wear, UK , 2009 .