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An integrated 3D approach to assess the geothermal heat-exchange potential: The case study of western Sicily (southern Italy)
Affiliation:1. Institute of Geoscience and Earth Resources, CNR (National Research Council), Italy;2. Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Italy;3. Department of Geosciences, University of Padova, Italy;4. Aarhus Geophysics, Denmark;6. Department of Land, Environment, Agriculture and Forestry, University of Padova, Italy;7. Department of Earth Sciences, University of Florence, Italy;1. Department of Systems Engineering and Engineering Management, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region;2. School of Management, University of Texas at Dallas, Richardson, TX, USA;3. Centre for Systems Informatics Engineering, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region;1. Dipartimento di Automatica e Informatica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy;2. Dipartimento Energia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy;1. University of Zagreb, Faculty of Electrical Engineering and Computing, Unska 3, HR-10000 Zagreb, Croatia;2. GULIN Automation and Control Ltd., Put kroz Meterize 33, HR-22000 ?ibenik, Croatia;1. Laboratory of Environmental and Energy Efficient Design of Buildings and Settlements, Department of Environmental Engineering, Democritus University of Thrace, Vas.Sofias 12, Xanthi 67 100, Greece;2. Centre for Renewable Energy Sources and Saving, Solar Thermal Systems Department, 19th km Marathon Ave., Pikermi 19009, Greece;3. Process Equipment Design Laboratory, Department of Mechanical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
Abstract:This paper presents a multidisciplinary methodology to estimate the underground heat-exchange potential for Borehole Heat Exchangers (BHEs) coupled with Ground Source Heat Pumps (GSHPs) over wide areas. The proposed methodology was tested in four sites in western Sicily (southern Italy) where the shortage of subsurface geological data, in addition to the undefined authorization processes for this kind of system, is probably the main barrier to planning and exploiting geothermal heat for heating and cooling purposes. Reliable high-resolution 3D geological and petrophysical models were built based on the integration of airborne electromagnetic data and laboratory measurements of the thermal properties of rock samples. A GIS-based procedure was applied to assess the geothermal heat-exchange potential using 3D models of thermal conductivity as the main input. The results of the analyses are represented by thematic maps of the underground heat exchange potential for BHEs coupled with GSHPs. The study areas show a generally high suitability for the use of this technology and several municipalities in the area could take advantage of the resulting maps for energy planning.
Keywords:Borehole heat exchangers  Geothermal energy  Ground thermal conductivity  Heat-exchange ground potential  3D geological modelling  Airborne electromagnetics
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