Well (traditional water) and heat pump

[chleu stone]

Hello everyone, subscribed to your forum very interesting, because I ask myself a few questions:
In your opinion, is it possible to do a geothermal energy, with a heat pump, with a traditional water well about 15m deep as a caloric captor?
will the exchange be good?
Thank you for all your answers.

[Christophe]

Well a priori we could say yes but it will depend on "the source" of the well ... if the water is stagnant and not renewed it will cool quickly ... until it freezes?

If it is renewed, the flow must be estimated.

[chleu stone]

Yes OK. it's in a friend's house, he plans to put rainwater in it, he must have studied it then, (level), he also wants to use this water for flushing and washing machine
In principle what would be possible? (if there is enough water)
Thank you

[Christophe]

Ok, is it rather a lost well?

So I think it's not possible because the water flows would be a priori much too low.

Estimate the water flows, the energy contained in 1 L of water between 20 and 5 ° C (*) as well as the heating needs and you should see that it will not stick.

* we assume that the heat pump is working on a delta of 15 ° = 4.18 * 1 * (20-5) = 62.7 kJ / L = 0.017 kWh / L therefore 1 / 0.017 = need 57 L to make 1 kWh. A well insulated house consumes in winter about 10L of fuel oil per day or 100 kWh or in your case a need for a flow of 5700L of water per day ... that's a lot ...

[gegyx]

If it's not unfortunate to dump the rainwater (which has taken air pollution, roof, chemical residues which flicker), directly in a source 15 m deep ...


***
For a cap, like that of André, fresh water is pumped into a well and discharged hot into another well (another vein?) 13m minimum.

[Christophe]

Uh if it rejects warmer, it's an air conditioning then

[chleu stone]

Oops for the pollution of the nap ....
it is an old one then, it is about 15m, and has about 70cm of water at the moment (dry enough )
I wonder if we could recover a little energy, knowing that in winter it is much wetter (and yes, it is in Normandy)
yesterday the water was 13, 14 °
even without heating the whole house, we must be able to recover a little (combined with a wood pile or other)

[Christophe]

I wonder if we could recover a little energy, knowing that in winter it is much wetter (and yes, it is in Normandy)
yesterday the water was 13, 14 °
even without heating the whole house, we must be able to recover a little (combined with a wood pile or other)

I made you a 1st estimation calculation above ...

[dedeleco]

Thus we measure the energy in volume of Olympic swimming pool !!
5,7m3 per day over 200 days (2m3 of fuel per year) gives 1140m3, typical of an almost Olympic-size swimming pool !!!

Putting this cooled water back in the ground, a few tens of meters away, if it returns to the well heated by the earth with this flow rate of 5,7m3 per day, in winter, it can work, like a Canadian well formed by the earth crossed by this water.
The same goes for the volume of soil in a Canadian well used to heat the house.
The well almost has to be on an underground river.

A house of 100m2 of roof gives about 70m3 of rain per year !!
It is therefore necessary that the well easily collects rainwater on at least 1500m2 of soil, which is not impossible, with luck with the cracks in the soil.

[Christophe]

"If it comes back" this is the operating condition

So yes dedeleco can work, provided, as I say from the start, that there is a "circulation", that is to say that water "fresh" at the temperature of the basement arrives permanently at the exchanger ...

A groundwater table, essential for geothermal drilling on a water table, is constantly flowing ...