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.
That really shows the differences. The applications cost €70 each, for me twice because of mining law due to a depth greater than 100m (330 feet). Setting up the equipment is €250 instead of €1350.
Pressure testing costs €120 instead of €450.
No geologists are needed here either.
I don’t need a distribution chamber because there is only one probe. Also, they seem quite expensive to me.
You need the container if you are not allowed to discharge the drilling sludge into a body of water or store it on your property... but the container here only costs €270 including disposal. Also, I already have the water included, which in your offer will probably have to be provided on site (although that may be just a minor cost).
Pressure testing costs €120 instead of €450.
No geologists are needed here either.
I don’t need a distribution chamber because there is only one probe. Also, they seem quite expensive to me.
You need the container if you are not allowed to discharge the drilling sludge into a body of water or store it on your property... but the container here only costs €270 including disposal. Also, I already have the water included, which in your offer will probably have to be provided on site (although that may be just a minor cost).
denz. schrieb:
Do I understand this correctly? If the heating load calculation results in 6 kW, the borehole is only designed for 4.6 kW? I previously assumed the borehole would be sized for 6 kW or somewhat more, possibly 6.5 kW.
Regards
denzThat’s correct. Required heating capacity / (1 - COP).
Drillers here calculate with 80% to 75% and size accordingly. Some also add a safety margin. I would do that too, maybe 5 m (16 feet), even if it’s not really necessary, especially when improved grout material is used. But nobody wants to regret saving about €300 later if the probe doesn’t perform well. No one can look 100 m (330 feet) deep into the ground beforehand, geological maps notwithstanding. And individual tests are unaffordable for a single-family house.
Cool, a link to a state government website (funding for geothermal energy in NRW) is removed citing forum rules, but I see links to various advertisers under every post. The embedded external sources slow down the site so much, and the ads make the forum almost unreadable.
I’ll step back now – just wanted to help...
I’ll step back now – just wanted to help...
T
toxicmolotof20 Mar 2018 20:22I’m not sure how it is in other states, but in NRW there is a worldwideweb.geothermie.nrw.de portal *cough* where you can check the likely extraction performance at a drilling site. I assume there are similar resources everywhere.
In terms of "yield," we are on the border between 2c and 2b (so lower good) for short probes. For longer probes, the yield actually decreases here. If the yield is classified as weak medium or even critical, I wouldn’t seriously consider going ahead with it.
In terms of "yield," we are on the border between 2c and 2b (so lower good) for short probes. For longer probes, the yield actually decreases here. If the yield is classified as weak medium or even critical, I wouldn’t seriously consider going ahead with it.
Based on the posts here, I was probably right to say that geothermal energy with drilling is not economically viable in southern Germany. Especially since modern air-to-water heat pumps can now achieve a COP of over 4, which further worsens the payback period for geothermal systems. Additionally, noise emissions have been greatly reduced in modern units. Even mine can only be heard when standing right next to it.
It’s really a shame—such a great technology, but no longer feasible in this simple form!
It’s really a shame—such a great technology, but no longer feasible in this simple form!
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