Hello,
here I would like to share some experiences and data regarding my brine heat pump and deep drilling, based in part on the expert’s "questionnaire":
a) What is the soil composition on your property?
Up to 3m (10 feet) silty, fine sandy, clayey soil
Up to 4m (13 feet) slope debris, rock fragments
Then bedrock (mainly limestone)
b) How deep was the drilling?
Drilled twice to a depth of 72m (236 feet)
c) How much did the drilling cost?
€10,400 including double U-probes DN25
Grouting material with 2.0 W/mK thermal conductivity
Permitting process (building permit / planning permission)
Pressure-tight house entry at the basement and underground routing of supply lines (about 25m (82 feet))
Filling/draining equipment, filling, pressure testing, etc. (all inclusive)
d) How much did the system cost?
System: Tecalor TTc 05 with heating output at B0/W35 of 5.8 kW and coefficient of performance (COP) of 4.8
Cost: €9,800
e) Were there any difficulties during installation, if so, what kind?
Because the water used to flush out the drilled material during drilling seeped away, a "small compressor" was needed to blow it out with air. However, it had to be placed on a neighbor’s property who had not yet started building. The machine was the size and approximate weight of a 20-ton truck but was off-road capable. This caused a 2-day delay because the compressor first had to be transported to our site. No additional costs were charged.
f) How is the daily operation?
"Like a refrigerator." Once the parameters on the heating system are correctly set, the only thing that should be done is occasionally reading the information/data such as operating hours and source temperature. Otherwise, it runs "on its own," just like any heating system. When the door is closed, the unit is virtually inaudible. Very discreet since, apart from the cabinet in the utility room, nothing else is visible (all brine pipes are underground).
e) What are the operating costs for which living area?
Currently, a living area of 180sqm (1937 sqft) is heated, plus an additional 65sqm (700 sqft) of cellar space within the insulated thermal envelope (these rooms are around 15-16°C (59-61°F) on the coldest days). From September 2014 to September 2015, 2,000 kWh of electricity was consumed for heating and hot water (2 adults, 1 baby, 1 toddler). The house is a KfW-70 standard building according to the 2009 energy saving regulations, which already met the required technical standards before the central ventilation system with enthalpy heat exchanger was installed (we decided to add this after the initial applications).
f) to be continued ....
Note regarding the comparison of the coefficient of performance (COP):
Since optimizing the heating curve and settings at the end of last year, the system has had a COP of about 5.5. Operating hours are around 1200; the deep borehole was drilled approximately 20% deeper than initially recommended by the companies, at our own request.
here I would like to share some experiences and data regarding my brine heat pump and deep drilling, based in part on the expert’s "questionnaire":
a) What is the soil composition on your property?
Up to 3m (10 feet) silty, fine sandy, clayey soil
Up to 4m (13 feet) slope debris, rock fragments
Then bedrock (mainly limestone)
b) How deep was the drilling?
Drilled twice to a depth of 72m (236 feet)
c) How much did the drilling cost?
€10,400 including double U-probes DN25
Grouting material with 2.0 W/mK thermal conductivity
Permitting process (building permit / planning permission)
Pressure-tight house entry at the basement and underground routing of supply lines (about 25m (82 feet))
Filling/draining equipment, filling, pressure testing, etc. (all inclusive)
d) How much did the system cost?
System: Tecalor TTc 05 with heating output at B0/W35 of 5.8 kW and coefficient of performance (COP) of 4.8
Cost: €9,800
e) Were there any difficulties during installation, if so, what kind?
Because the water used to flush out the drilled material during drilling seeped away, a "small compressor" was needed to blow it out with air. However, it had to be placed on a neighbor’s property who had not yet started building. The machine was the size and approximate weight of a 20-ton truck but was off-road capable. This caused a 2-day delay because the compressor first had to be transported to our site. No additional costs were charged.
f) How is the daily operation?
"Like a refrigerator." Once the parameters on the heating system are correctly set, the only thing that should be done is occasionally reading the information/data such as operating hours and source temperature. Otherwise, it runs "on its own," just like any heating system. When the door is closed, the unit is virtually inaudible. Very discreet since, apart from the cabinet in the utility room, nothing else is visible (all brine pipes are underground).
e) What are the operating costs for which living area?
Currently, a living area of 180sqm (1937 sqft) is heated, plus an additional 65sqm (700 sqft) of cellar space within the insulated thermal envelope (these rooms are around 15-16°C (59-61°F) on the coldest days). From September 2014 to September 2015, 2,000 kWh of electricity was consumed for heating and hot water (2 adults, 1 baby, 1 toddler). The house is a KfW-70 standard building according to the 2009 energy saving regulations, which already met the required technical standards before the central ventilation system with enthalpy heat exchanger was installed (we decided to add this after the initial applications).
f) to be continued ....
Note regarding the comparison of the coefficient of performance (COP):
Since optimizing the heating curve and settings at the end of last year, the system has had a COP of about 5.5. Operating hours are around 1200; the deep borehole was drilled approximately 20% deeper than initially recommended by the companies, at our own request.
Joedreck schrieb:
Okay, listen up: geothermal energy works with a trench collector installed yourself for a maximum of about 2000€ (around 2200 USD). And this is also subsidized by the BAfA. So basically free money.
By the way: 15,000€ (about 16,500 USD) for the drilling is really expensive Yes, there are companies that drill starting from 10,000€ (around 11,000 USD), that's true. You won’t find it cheaper than that. The 15,000€ (around 16,500 USD) quote was from the market leader, who offers extensive warranties.
A trench collector is cheaper, that’s true. You do need some space, and not many companies offer this option.
Bookstar schrieb:
Yes, there are companies that charge at least 10,000 euros (about 11,000 USD) for drilling, that’s correct. Nothing is available below that. The 15,000 euros (about 16,500 USD) price was from the market leader with extensive warranties.
Trench collectors are cheaper, that’s true. You just need more space, and only a few companies offer them.Drilling costs may vary regionally. However, my quoted price included everything, even higher-quality grouting material. I don’t believe there is a real market leader; it’s more likely a regionally well-known company.Saruss schrieb:
However, a trench collector system requires a suitable plot of land. Many trees and shrubs won’t grow above it, and the soil often shifts significantly. It’s really only feasible with a large lawn area. I also estimate that renting an excavator and all the necessary materials and professional connections will make 2000 tight (you need materials and proper connections!), unless you happen to have contacts, but that’s not the usual case.
That’s not entirely correct as a general statement, but it doesn’t matter. The point was simply to illustrate "the other extreme."Joedreck schrieb:
That’s not generally true, but it doesn’t really matter. The point was simply to present "the other extreme."It is far less of a generalization than your post. A few houses down from me, someone has a trench collector—I was able to observe everything I mentioned. It is more stable in dry soil but also significantly less efficient. The freezing energy can actually make a trench collector very efficient.denz. schrieb:
Quick question about this: This is a regional funding program. How did you find out about it? Is there a website where such funding programs are listed?
I want to build in Mecklenburg and haven’t found anything like this so far.
Regards
DenzNo idea. Just try googling.
Bookstar schrieb:
Yes, there are companies that charge from 10,000 euros (about 11,000 USD) for drilling—that’s true. You won’t find anything below that. The 15,000 euros (about 16,500 USD) was from the market leader with extensive warranties.
Trench collectors are cheaper, that’s correct. You just need a bit of space, and only a few companies offer them.Ground source heat probes simply don’t make sense everywhere, which is reflected in higher prices. However, this should not lead to the general misconception that this type of heating system can’t be cost-effective.
By the way, I forgot to mention in my previous post that the heat pump itself is actually cheaper than an air-to-water heat pump, since they are essentially the same except that the outdoor unit is not required.
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