GIS-mapping model of low entalphy geothermal potential in Southern Italy (VIGOR PROJECT)

Abstract

Low enthalpy geothermics is based on the exploitation of the thermal energy generated and stored in the Earth by means of ground source heat pump systems (GSHP). These systems, which take advantage from the fact that the ground temperature is almost constant, are able to exchange heat with the ground with relatively shallow boreholes (depth typically about 100 m and generally lower than 200 m). The aim of the study, carried out in the frame of the geothermal assessment of the VIGOR Project, is to create a digital cartographic instrument, based on Geographic Information System (GIS). This outcome is not only devoted to geothermal aims, but also open to all geological uses. The resulting database will be easily accessible, upgradeable, and able to synthesize geological knowledge of the underground thermal properties. In this way, a useful tool for territorial planning and environmental control is obtained and will be made available. Knowledge about the physical and thermal parameters has to be supported by thematic maps. The work done suggests a methodological approach able to define the features that mainly influence the ability of the ground to “geoexchange”. Geological and thermodynamic properties are recorded in a dedicated geo-database. The corresponding digital thematic maps can be combined, by means of a suitable algorithm, to determine the geothermal potential map. Examples from Apulia region are discussed.