Optimizing the use of wells and trenches?

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fam
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Optimizing the use of wells and trenches?




by fam » 29/09/11, 10:13

Hello

For my isolated site housing project, I had to drill a hole that turned out to be deeper than expected (62 m).

The water height is 30m and the flow of 600l / h approximately this summer. temperature not yet controlled.

Before wiring and filling the 25m trench, 80cm deep (unfortunately no more because of the rock slab) I wondered if we should not think about optimizing this installation but I think that Canadian wells and geothermal energy are not possible.

(Reminder, no EDF connection, electricity by group for> 1kw and by batteries (rechargeable by renewable) for the rest)

Thank you for your reply.
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by Christophe » 29/09/11, 10:45

What is the question exactly? : Mrgreen:

Why no Canadian well?
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by dedeleco » 29/09/11, 13:41

We can also store a little bit of summer solar heat for the onset of cold weather and a cheap thermal buffer, as is done throughout the winter on a larger scale at
www.dlsc.ca
(real Canadian well improved without false geothermal energy like PACs which are a deception, because their geothermal energy is only the solar heat stored underground for more than a year, with nothing coming from the depths of the earth, and therefore nothing geothermal, and therefore preheating this Canadian well in summer greatly improves the yield, finally the term geothermal energy with PAC is a real misleading lie, one more scam in the usual ones on heating)

https://www.econologie.com/forums/chaleur-d- ... 10828.html

https://www.econologie.com/forums/ami-appel- ... 3-130.html
https://www.econologie.com/forums/stockage-d ... 78-40.html

This in addition to thermal solar panels on the first 30m without water from the well and on the trench (conservation over one to two weeks of heat in the trench at 1m deep)
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by stipe » 29/09/11, 13:46

Christophe wrote:What is the question exactly? : Mrgreen:

Why no Canadian well?

Because of the shallow depth?
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by dedeleco » 29/09/11, 14:05

The 32m well without water is therefore very sufficient for a fairly long buffer storage.
At 1m the corresponding buffer stores over one to two weeks as well as a big balloon, see the links on thermal diffusion over 1 m = 1000mmm and therefore diffusion time 1000x1000 = 1 million seconds or 11 days, and 3 times more time in potting soil or light earth !!!!

Understand the concept of thermal diffusion, very poorly taught to heating professionals !!! see the moving figure of the diffusion front as the square root of time

https://www.econologie.com/forums/chaleur-d- ... 10828.html

So putting sheaths in the trench and the well, will allow you to slide the exchanger pipes later if you put thermal solar panels.
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by Forhorse » 30/09/11, 07:36

The return of rain-man, aka dedicated : Cheesy:
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by Christophe » 30/09/11, 08:16

Hihihih, it's well known: underground waters are always stagnant : Cheesy: : Cheesy:

Depending on the region and altitude, at 85 cm you already have good thermal inertia (mostly frost free).

Did you know that in Corsica ... the water meters were ... visible on the street?
: Shock:

Proof that it should not freeze often or for a long time ...
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by dedeleco » 30/09/11, 14:06

.the water meters were ... visible on the street

Same in 83 and 06, close to the sea, counters not buried !!
In Corsica also true as at the seaside, not at 1000m altitude !!
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by stipe » 30/09/11, 14:22

Christophe wrote:Depending on the region and altitude, at 85 cm you already have good thermal inertia (mostly frost free).

By the way for this kind of DIY, can it be worth doing a kind of double flow?
Let me explain :
At 85 cm underground we pass several pipes, some with the stale and hot air of the house and others bringing in fresh air to the house, a mixture between a Canadian well and a DLSC dear to "dedicated the eco "....

is it worth it? Given the low cost of the installation with a trench already made. It could be integrated into any new construction or along the foundations we would integrate this kind of system ...
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by dedeleco » 30/09/11, 16:26

Good question which leads to separate the different functions:

1) exchanger between hot and cold to be heated with the hot to be recovered almost at the same instant (a few seconds), like a VMC with double flow exchanger which does not store heat for long periods. So, without storage, there is no need to go underground or in a large balloon.

2) heat storage for a more or less long period before exchanging heat for cold, with significant delay between the two flows in the opposite direction.
Storage (earth or tank) therefore always includes a double exchanger, which can be reduced to one if storage and use are done at completely different times (like day then night, or summer then winter), simply by changing the direction of circulation of the exchanger fluid (water or air).
But if there is a risk of doing both storage and use functions partially at the same time, it is better to double the pipes, with the entry to store separate from the exit to use, given the relative low price of the pipes.

To store, what is important is the volume or quantity stored (thermal capacity), the speed or thermal flux of entry or exit of the storage (thermal conductivity) and the duration of the storage without too many losses (distance of diffusion underground or insulation of a balloon).
The trench and the well above the water have a limited capacity (compared to the needs), but not zero.
The rocky slab (limestone, granite, or other rock ???) around the well 30m above the underground water table, has a long-term thermal constant as at www.dlsc.ca (if we avoid or deviate further the surface rainwater above, with a superficial plastic sheet around at the top, of the well in compact rock), but with a lower capacity, nevertheless useful, given the length not very big.
The trench has a storage period (especially with potting soil) of the order of one to two weeks, good for storing a few days or from day to night.
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