Geothermal energy is that source of energy due to the heat stored in the earth’s crust. The latter, to get to the surface, propagates through the rocks or through fluid carriers, such as water and gas. The part of this heat that is transmitted through the rocks reaches the surface in the form of heat flux or geothermal flux.
The geothermal flux is 0.065 W / m. At a depth greater than .f 0O m, soil conductivity is generally considered constant at 2.2 W / m. With these values, the temperature gradient is 3’C / 100 m. Proceeding in depth, therefore, the temperature increases on average by 3 “C every 100 m, unless thermal anomalies.
Geothermal systems traditional geothermal system consists in cooling the superficial layers of the ground that transfer heat to a sufficient thermal level for the evaporator of the heat pump for heating purposes. to obtain this thermal exchange there are various techniques, the most widespread and the most studied in literature consists in the construction of geothermal wells of limited depth, of the order of 100 m.
To create a geothermal system, one or more vertical perforations are carried out according to the building’s thermal power needs and a closed system is inserted in each of them consisting of delivery and return pipes inside which the fluid composed of water flows and antifreeze.
The earth by conduction gives heat to the probe (consequently to the fluid returning to the heated surface) which, in turn, transmits it to the heat pump, thus returning to the well at a temperature lower than that of the ground. Generally, the perforations have a depth between 80 and 150 meters, depending on the type of terrain and use.
Under these conditions, the subsoil temperature is not influenced by the external climatic variations and it remains roughly constant throughout the year, around 15 ° C. However, by carrying out the heat exchange with the external fluid, the soil is cooling down, this process can be reversed during the summer by circulating more hot water in the pipes resulting from cooling processes. This differs from Flexible Solar Panels, which are becoming increasingly common around the world.
An green energy supplier can be both a supplier of electricity and gas, including Flexible Solar Panels. It is not easy to compare the kWh price of electricity with the kWh price of natural gas because the heating values of electricity and gas are not equivalent. To know what would be the cheapest for you, it is better to compare the price of electricity and gas depending on the type of use envisaged (cooking, hot water, heating), the number of occupants in the dwelling, the area of housing.
