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.
RoyalTS schrieb:
Sorry, I’m a bit confused myself now: Regarding the above: 4.8kW is the guaranteed cooling capacity – is that also the total output of the ground probe?
Regarding point 5, it’s clarified: The expert is already included in the offer. The total output of the ground probe is about 80% of the capacity of the selected heat pump.
RoyalTS schrieb:
- Disposal of drilling sludge, if not possible via sewage system (flat rate +500 Euro) Rather expensive.
RoyalTS schrieb:
- Backfill material is standard with a thermal conductivity of about 1 watt :-(Poor quality.
RoyalTS schrieb:
- Bureaucratic handling etc. is all included. Normal.
RoyalTS schrieb:
As mentioned: about 15,000 Euro for 4.8kW (guaranteed). What do you think? Abandon the project, it’s not worth it. And I say this as a fan of geothermal energy.
guckuck2 schrieb:
Giving up on the project is not worth it. And I say this as a geothermal energy fan.Phew, a clear statement.
Unfortunately, there’s no room to negotiate on the pricing anymore. Our system roughly cost half that, with a drilling depth of 120m (394 feet) for a single borehole.
An offer of €15,000 was made once, but that was an all-in price from a heating installer who would have subcontracted the drilling and didn’t know anything about the location or drilling depth during the offer phase. So it was calculated with a large safety margin (for them).
An offer of €15,000 was made once, but that was an all-in price from a heating installer who would have subcontracted the drilling and didn’t know anything about the location or drilling depth during the offer phase. So it was calculated with a large safety margin (for them).
guckuck2 schrieb:
Unfortunately, the pricing is no longer reasonable. Our system cost roughly half that amount, with a drilling depth of 120m (394 feet) for a single borehole. May I ask where your system is located? I compared my offer with some other acquaintances, and here in the south, the prices always come out around the same as mine: approximately €13,000–14,500 all in. Is this due to the region? I've heard that the further south you go, the more expensive it gets...
RoyalTS schrieb:
May I ask where your system is located? I compared my quote with some other acquaintances, and here in the south, they always came out around this amount as I did: about €13,000–14,500 all in. Is it because of the region? I've heard it gets more expensive the further south you go... NRW.
Sure, the south is more expensive, and the ground conditions will also play a role.
But even if the quote is reasonable under these circumstances, from an economic point of view it simply doesn’t make sense anymore. In that case, you’d be better off installing an air-to-water heat pump. The thousands in extra drilling costs will never be compensated by the lower energy consumption.
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