ᐅ Planning/Preparation for a Deep Foundation Drilling

Created on: 27 Sep 2015 10:54
F
FloLiX
Dear forum members,

I am planning to build a single-family house with a heat pump and want to carry out a deep drilling for this purpose.

Problems in my view – possible legacy issues from mining (Ore Mountains).

In another post, I also read that the local water authority has objected:

“Now the local water authority has thrown a wrench in the plans and does not allow deep drilling.”

Therefore, I would like to know where problems generally arise and how these can be identified early and avoided.

Best regards,
Florian

PS: The construction company believes that deep drilling would not be problematic.
PPS: I would prefer not to be surprised by insurmountable problems after the planning process.
L
Legurit
27 Sep 2015 13:02
mea culpa:
Innovation funding is possible for both new construction and existing buildings. Please note that the application must be submitted before the project starts. The project start is defined as the signing of a supply/service contract or the awarding of a contract related to the heat pump applied for. The development of the heat source is not considered the project start.
FloLiX29 Sep 2015 08:24
Thank you very much for the quick and detailed responses, including those about subsidies.

Although I couldn't find a database for deep drilling, I did find official geothermal maps (in the "target area," the map indicates an extraction rate of 55-57.5 W/m).
L
Legurit
29 Sep 2015 09:53
That is already quite good. For us, it is, for example, only 39 W/m (12 W/ft).
Ecart19 Oct 2015 17:29
BeHaElJa schrieb:
That is indeed quite good. For example, we only have 39 W/m.

This thread by FloLiX prompted me to look into a geothermal system for our construction project.

"Good heat pump heating systems with ground probes (brine/water heat pump) as the heat source cost only slightly more than an air-source heat pump for newly built, average-sized single-family homes.

The annual operating costs of brine/water heat pumps are significantly lower compared to an air/water heat pump."

I have a quote (allegedly from a market leader; gross: € 6,664) with a theoretical (non-binding) preliminary assessment and a heat extraction capacity of approx.: 55 W/m.

Domestic hot water preparation: according to the Energy Saving Ordinance 2009!

A "market leader" should be aware that the Energy Saving Ordinance 2014 replaces the previous regulations from 2002, 2004, 2007 and 2009.

Technical report: Heat output heat pump 8.0 kW; ENEV 2009; drilling depth 110 m; low risk.


Drilling: € 5,712
Connection work: € 982

How should this offer be evaluated?
Are there any forum users with current new geothermal systems who would like to share their experiences?
S
Sebastian79
19 Oct 2015 17:39
2009 and 2014 don’t differ in this regard – so it doesn’t really matter and is often done that way. I know the provider – their price was still somewhat higher than the one we have now. You need to check all the potential extra items, as this will result in a significant additional cost...
Ecart19 Oct 2015 21:13
Official links, for example from KfW Bank, the Geological Survey of NRW, etc., should generally be allowed.
===
This would provide added value for many readers. If not desired, I will refrain from these activities here in the forum!


Color-coded map of North Rhine-Westphalia with zone colors and city names.



Legend for geothermal probes with color codes and assignment

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