- SIGS: Integrated geothermal solar heating and cooling system in smart-grid logic
The present project proposes the integration of the geothermal source at low temperature, contained in the subsoil in multilayer aquifers and sediments, and the photovoltaic solar integrated with the power supply of the geothermal heat pumps (PDC). For the extraction of geothermal heat at low depth, it operates on aquifers through production wells and reinjection with innovative well drilling and completion technologies.
Over 55% of the general energy demand at the European level is to be attributed to heating / cooling needs.
Consequently, particularly in the low-enthalpy sector, the development of innovative technologies that enable energy savings and the reduction of greenhouse gas emissions is extremely important. In this regard, methodologies that allow the integration of different sources of renewable energy (solar, geothermal, biomass, etc.) represent a very promising approach for the future.
The integrated use of renewable sources for the air-conditioning of buildings is, at present, a research sector of considerable interest both in relation to the mitigation of climate change (and therefore also to achieve the EU 202020 objectives), and for industrial development. in relation to the large market that underlies.
The present project proposes the integration of the geothermal source at low temperature, contained in the subsoil in multilayer aquifers and sediments, and the photovoltaic solar integrated with the power supply of the geothermal heat pumps (PDC). For the extraction of geothermal heat at low depth, it operates on aquifers through production wells and reinjection with innovative well drilling and completion technologies. The current open circuit geothermal PDC technology presents the need for technological innovation in the pumping and re-injection techniques of fluids in the aquifer, to solve the problems related to the transport of solids (silts and clays), and the problems related to fouling due to sliding of the underground waters in the plants (from the wells to the PDC).
The thermal energy produced by the demonstration plant will feed the thermicosanitary load of a building for directional use and, to solve the asynchronicity between production and load and optimize the technical and economic management
of the whole system will be studied, developed and implemented demonstrators of accumulated thermal energy.
The technical and economic optimization of the whole system, in the logic of smart grids, also requires a rational and accurate management of the thermal utilities keeping the psychophysical wellbeing of the users of the building high. It is difficult to "quantify" the impact that various corrective actions (for example, on the heating / cooling system) have on perceived welfare levels, or what is the right tradeoff between saving energy consumption (electricity and / or heat) and reduction of well-being. Therefore, innovative ICT systems will be designed and developed to improve the efficiency of the building, with particular attention to energy consumption and heating and cooling systems, facilitating the integration of the geothermal source in pre-existing systems and improving the levels of comfort perceived by users.