Alternative Energy

Geothermal?

There are two types of  “geothermal": the  classic one, relative  to the exploitation of geologic or vulcanologic anomalies and that to " low entalpia" , relative to the exploitation of the subsoil  like thermal tank from which to extract heat during the winter season and from which to yield some during the summer season.
The first type of geothermal, regards the production of electric power (vd Lardarello) and thermal  waters (Aqui Terme in Piemonte, Abano Terme in Province of Padova, Lazise and Caldiero in Prov di Veorna, Ferrara in Emilia etc.) used for heating.
Geothermal to low entalpy is that " geothermal with which any building, in any place of the earth, can heat or refresh , instead of  using the classic boiler during the winter and the air-conditioning in the summer .
For our housess we use the lowland entalpy.

Can it be used  everywhere?

Yes, it can. The system is applicable in any type of subsoil, and in any regions of Italy… at the sea, in the  mountain, plain, hill, near  the lake, city, campaign…

and if  there is  a stratum?

 In presence of a stratum, the system is more efficient.. Moreover the water resource is not altered, because it is  only of a heat exchange.

But then can it be used  in order to heat any houses?

No. In reality the limit of the technology resides in the fact that is economically attractive only in presence of   low  temperature terminals.

What are the  low temperature terminals?

The heating systems are constituted by two parts: heating  generatores , suh as: traditional gas , diesel oil, GPL boilers, geothermal,  biomasses boilers, etc and the teminals that is the classics radiators, or the ventil convectors,  floor, wall, ceiling systems etc. Usually the radiators work with hight  temperatures of about  65-70°C and they are defined  high temperature teminals.
The  floor, wall and celing  radiating panels systems   work at about 30-35°C and therefore they are defined low temperature terminals". The ventil convectors can work to variable temperatures.

I want to  build  a new house, and I would  like to instal   a geothermal system. Have I to preview the installatio of a little boiler ?

No. The geothermal system is  sufficient to guarantee all  necessary energy.

How much does my geothermal system coast and how much does it  consume?

The cost depends on how much  heating  the  building needs, and on the type of subsoil  from which heat is captured. However, for a room of 150 mq the cost is about   17.000 €.
Here follows  the calculation of a bill for a 4-5 family persons for the warm water production for heating, warm water for sanitary uses, and cold water for the summery cooling.

Example (house of  200 mq 4 persons heating and conditioning)
Energetic annual bill
Esteem of a medium isolated building

Types of heating pumps?

Direct evaporation :
The exchangers lay  into diggings, that, then, will be closed. Garden of  medium dimensions are requested, it should be about the double of the sqare meters of the house In the  world the horizontal applications represent more han a half of the total and are particularly efficient at ours latitudes. The tubes lay at  a deep of about 2 mt.

Geothermal probe or Sol circuit:
Vertical solution: the exchangers are inserted in perforations, that then are sealed with specific products to  preserve water-bearing stratums and to maximize the heat exchange. It is spoken in this case of geothermal probes. We remember that in some cases the perforations can catch up the 100 mt.

 

In groundwater table:
Solution stratum water : the circuit is opened; it comes captured stratum water from a sink and injected into another one, after being passed  through the heat pump. It is  a solution that today is used in the majority of the cases for the low costs of