Soil clay and geothermal energy: questions.

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michael
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Soil clay and geothermal energy: questions.




by michael » 25/09/06, 20:41

Hello everyone
I just land on the site and I come to you all for advice
I have just signed up to have geothermal underfloor heating for my house under construction.
Only problem, the ground is in clay? what solutions are available to me? is clay good for this type of heating? should i remove this earth to put a better one? should i mix? should i put sand at the bottom?
Thank you for your answers
Michael
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gegyx
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by gegyx » 25/09/06, 22:29

In Orleans, there is often clay, and it's not good for crops… In the gardens, some people think of removing it and bringing in good topsoil; it is a good choice for the future. At home the ground is clay, mediocre for culture. But when I dug to make a well, after 2 m of clay, there was only sand, quickly wet. In fact water is everywhere from 2,50m. It is alluvial sand, and it is not a surprise, because the Loire passes at 5 km. But what surprised me by looking at a map of the BRGM, is that this alluvial sand is found on a width of 30 km. In fact the bed of the course of the Loire has evolved a lot during the different geological eras and has moved…
It would be astonishing if in your region of Lyon, between Saône and Loire, it is not the same configuration. If your ground is not high, under your clay there should be alluvial sand, and standing water. Ideal for a calorie recuperator.
Consult the geological maps. Ask neighbors in the neighborhood, who have wells, to find out more about the presence of water.

You have to pump on one side, go through the heat pump and discharge into another well 15 m further.
Solution doable by yourself.
A single well at great depth, with exchanger. Solution made by a specialist.
If the water is not far, dig the clay, to install a horizontal circulation network.
Big way to return the field.
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by Other » 26/09/06, 05:08

Hello
Land where there is no water or nothing but rock, you need to bring in a specialized company that drills a fairly deep vertical hole
with a diameter of 15 cm then he puts a U-shaped tube with plastic loop and he buries everything with fine sand to make a good heat exchange, we circulate a water / glycool mixture to use it as an exchanger with the thermo pump
In winter we try to freeze the hole and in summer we try to heat the hole. we pump the calories from the earth.
Drilling the hole is quite expensive and contrary to what one might think in the rock is less expensive (no need for a pipe)
Andre
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by Polo » 27/09/06, 13:23

If you want a heated floor there is also the PSD (direct solar floor). The heat transfer fluid passes below the tiles after passing through the collectors. The tiles must be protected by 4 cm of insulation and the piping must be 5 cm from this insulation (9 cm in all)
I don't know i it can be useful to you but hey we don't know jms ...
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