Shaft well for heat pump, underfloor heating for single-family house, heat pump for domestic water

[TD="class: alt1, bgcolor: #F5F5FF"]Hello everyone,

we are currently planning the heating system for our new building.
Our property borders directly on a river (Fuhse).

Now we have the idea to dig a shaft well with concrete rings 2-3 meters before the end of the property towards the Fuhse and fill it with gravel.
Then to excavate a kind of gravel bed from the bank of the Fuhse to the well and subsequently refill it with soil, so that the Fuhse water can reach the well all year round through this gravel bed.

At the bottom of the well, a pump will be installed that pumps the water to the heat exchanger of the house to heat it for heating (underfloor heating) and domestic hot water.
After passing through the heat exchanger, the water returns via the garden to the Fuhse, or rather into the groundwater.

My question to the experts:

Does this type of heat pump make sense?
Costs would be very manageable and the energy of the water would be the best regarding thermal conductivity, wouldn’t it?!

Many thanks in advance and best regards,
Marcel

Hello,

.., so that in this gravel bed the Fuhse water can reach the well all year round.

How is it ensured how the water (how much?) permanently is supplied and also safely discharged (infiltration well)? Water quality?

.....Does this type of heat pump make sense?

In principle, a hot water heat pump.

...and the energy of the water would be the best regarding thermal conductivity, right?!

Water (specific heat capacity) is not used as a carrier medium for nothing. A very good energy reservoir and transporter. One should not forget that energy (how much?) is extracted => temperature drop. It is no coincidence that antifreeze is added to closed systems (surface collector, vertical drilling, trench collector)! This is probably not possible with the open system here.;) So first have the demand calculated, then clarify the rest. regards

Since the shaft is located in close proximity to the river and the gravel bed is very deep (almost at riverbed level), the continuous water supply should be ensured.

There should be no indirect swallow wells; the water is either to be returned via drainage pipes on the way back from the heat exchanger and thus serve garden irrigation, or directed back towards the river/groundwater.

Unfortunately, I cannot say anything about the water quality at the moment. Is this really that important with river water?

On the topic of frost protection: Since the shaft is supposed to lie deep in the ground and the pipes leading in the soil to the house (heat exchanger), I think this is a form of frost protection.