Deep geothermal energy

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
dedeleco
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by dedeleco » 01/11/12, 14:23

So unless you are a soothsayer

See the very many BRGM reports, very detailed on the many boreholes in the Paris region and in Alsace as well, which have had good and also bad luck, and which allow us to know much better today !!!

Recharge thermally with solar or wasted heat, garbage, even thermal power stations, even nuclear, allows to store in perpetuity without exhaustion.
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by moinsdewatt » 17/11/12, 12:41

Larderello geothermal power plant

15 Nov 2012 lenergeek

The Larderello geothermal power plant in Italy is located on an exceptional geothermal field. With a power of 810 MW, it supplies electricity to a million Italian homes.

Image

Called the Valle Secolo power plant in Italy, the Larderello geothermal power plant in Italy has a total capacity of 810 MW.

It produces 4.800 GWh per year, an amount of electricity corresponding to the needs of a million Italian households.

It is located in Tuscany, on a site with exceptional geological conditions. It is a geothermal field with a surface area of ​​200 km2 characterized by the presence of hot granite rocks just below the surface of the ground. These rocks produce steam, the temperature of which reaches 220 degrees.

In 1904, the Larderello site was the scene of a world first. For the first time, geothermal energy makes it possible to produce electricity when Prince Ginori Conti manages to light five bulbs thanks to the steam which drives a turbine. The construction of a 20 kW experimental plant followed in 1905.

The first geothermal plant in Larderello was built in 1911. It would remain the only industrial site for the production of electricity from geothermal energy until 1958 (construction of a geothermal plant in New Zealand)

During the first years after its creation, it allows to light the dwellings and the factories of the city.

After the Second World War, the electricity produced in Larderello was used to electrify railways.

There has been a drop in productivity at the Larderello site in recent years. This drop in pressure levels amounts to 30% compared to the levels observed in the XNUMXs. The depletion of steam reserves is probably due to the prolonged operation of the site.


http://lenergeek.com/2012/11/15/la-cent ... arderello/

and then phew, there will be no dedeleco for us unhelped this post. : Lol:
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by chatelot16 » 17/11/12, 14:41

30% drop in production since the 50s

It proves that the soil is not a naturally isolated means of heat storage: it transmits heat coming from the center of the earth ... if it behaved by insulating the area of ​​earth used would have cooled faster than '' in 60 years
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by sen-no-sen » 17/11/12, 15:27

chatelot16 wrote:30% drop in production since the 50s

It proves that the soil is not a naturally isolated means of heat storage: it transmits heat coming from the center of the earth ... if it behaved by insulating the area of ​​earth used would have cooled faster than '' in 60 years


The heat from geothermal energy originates from the degradation of radioelements contained in the soil, and on the other hand - for the deepest layers - heat transfer from the moho (30-35km deep), heat also originating from the degradation of radio-elements.

Injecting water to cool the soil (we do not escape the laws of thermodynamics), the only way to curb the phenomenon, is either to re-inject hot water from an exogenous source, or to wait until the area returns to its original temperature (very very long) so you can dig even deeper ...
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by Ahmed » 17/11/12, 19:13

... or to limit the withdrawals in a way which is in balance with the supply of telluric heat.
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by Obamot » 17/11/12, 19:34

chatelot16 wrote:30% drop in production since the 50s

It proves that the soil is not a naturally isolated means of heat storage: it transmits heat coming from the center of the earth ... if it behaved by insulating the area of ​​earth used would have cooled faster than '' in 60 years


So no, that proves nothing .... Nor does Chatelot tell us what type of soil it would be in its demonstration!

On the other hand, what is not uninteresting as regards the same theory applied in medium depth (always notwithstanding the type of soil concerned and its own specifications ...)
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by Obamot » 17/11/12, 20:28

... is to see that it takes 30m to lose / gain a single small degree! It gives an idea of ​​the fantasy of some, when they would claim that we could also easily store the heat in the ground in an efficient way inexpensive as much as artisanal everywhere and this without particular know-how nor without knowing too how take it (obviously, it would not be because they would have said something that it would be definitively false, indeed : Cheesy: nor on the contrary that it would be definitively true ^^).
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by moinsdewatt » 08/12/12, 21:12

Geothermal energy and electricity production worldwide

Tuesday December 4, 2012 Energeek

Even if it only represents 0,4% of the global electricity mix, geothermal energy is the fourth renewable source of electricity. The main producing regions are located in volcanic areas, in North America and Asia.

In Europe :

According to figures in 2011, the electrical power installed within the European Union is 1.672 MW.

The European country that produces the most electricity from high-energy geothermal energy is, by far, Italy with 5375.9 Gwh produced in 2011 and a total installed capacity of 843 MW.

The main installation in the country is the Tuscan Larderello power plant (810 MW).

Portugal is the second European producer with 1.971 Gwh produced in 2011 and an installed capacity of 29 MW

Even if it has only one high energy geothermal power station (the Bouillante power station in Guadeloupe with a power of 15 MW), France is the third European producer, ahead of Germany and Austria.

In the world :

There are more than 350 geothermal installations producing electricity in the world. In 2010, their total power was estimated at 10.700 MW, against 8.000 MW in 2000.

Geothermal energy represents 0,4% of the global electricity mix. According to 2009 figures, it is the fourth renewable source of electricity in the world after hydraulics, wind and biomass.

There are around twenty producing countries in the world. The main production areas are Asia / Oceania (25,61 TWh produced in 2009) and North America (16,5 TWh). Indeed, the main world geothermal resources are located in the Pacific region (ring of fire) and in the region of the great African rift. Regions with high volcanic activity, the main source of heat used for high energy geothermal energy.

65 TWh of geothermal energy were produced worldwide in 2009.

The main world producers are the United States (3.086 MW and 16,5 TWh produced in 2009, ie a quarter of world production), the Philippines (1.904 MW), Indonesia (1.197 MW), Mexico (958 MW) , Italy (843 MW), New Zealand (678 MW), Iceland (575 MW) and Japan (536 MW).

Geothermal energy is of great importance in the electrical production of certain countries. It represents for example 15,9% of the Indonesian electric mix and 10,4% of the Mexican electric mix.



http://lenergeek.com/2012/12/04/geother ... -le-monde/
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by moinsdewatt » 01/03/13, 19:08

France revives research on high temperature geothermal energy

01 Mars 2013 enerzine

Two new exclusive high temperature geothermal research permits ** were signed on Thursday by the French Ministry of Ecology, Sustainable Development and Energy.
The first says "Permis de Chaudes Aigues-Coren" (located in the Cantal and Lozère departments) was delivered to the company Electerre de France SAS and the second says "Permis de Pau-Tarbes" (located in the departments of Pyrénées-Atlantiques and Hautes-Pyrénées) was delivered to Fonroche Géothermie SAS.


The principle of high temperature geothermal energy is to take heated water to a great depth either directly in a water table, or through fault networks where they circulate naturally, without creating new fractures. The water withdrawn, once cooled, is then reinjected. These waters can be used either for the production of electricity in geothermal power plants where they drive turbines, or for the production of electricity and heat in cogeneration, or only for heat supply.


"Geothermal energy makes it possible to produce energy from renewable resources and without any emissions. It is a sector that must be encouraged and supported," said Minister Delphine Batho.

If electricity production from geothermal sources is still marginal, since it represented 0,1% of electricity production from renewable sources in France in 2008, the increasing number of requests for research permits are a sign of revival of this energy sector in France.

18 requests are currently being examined by the Ministry of Ecology, Sustainable Development and Energy. For some of these requests, demonstrator projects have also been submitted, as part of the Geothermal Call for Expressions of Interest (AMI) from the Investments for the Future Program.

** Geothermal energy is said to be “high temperature” when the fluids exceed a temperature of 150 °.



http://www.enerzine.com/4/15387+la-fran ... ture+.html
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by Christophe » 19/03/13, 20:56

The return of deep geothermal energy

20 years since this had not happened: the Ministry of Sustainable Development has just granted two high temperature geothermal research permits on French territory.

PROSPECTIONS. These permits were granted to the company Electerre for prospecting in the Chaudes-Aygues-Coren region, between Cantal and Lozère, where it is hoped to encounter water at over 160 ° C at 3 meters deep. The second permit granted to the Fonroche Company concerns the region between Pau and Tarbes, on the Pyrenees foothills. Without anticipating the success of this research, this decision constitutes a real boost for a somewhat forgotten renewable energy sector.

(...)


http://sciencesetavenir.nouvelobs.com/i ... fonde.html
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