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.
Bookstar schrieb:
The heating method is not economical with deep drilling, no matter where. Air-to-water heat pumps are always more economical in Germany.
Air-to-water heat pumps have other disadvantages, which personally do not bother me.Wrong. For me, it is definitely different. Gas would actually be more economical for me, but since the city simply did not install a connection (which was more economical for the city), drilling plus a brine heat pump was the better option.Bookstar schrieb:
The type of heating is not economical with deep drilling, no matter where. Air-to-water heat pumps are always more economical in Germany.
Air-to-water heat pumps have other disadvantages, which personally don’t bother me.That statement is only true if you don’t take subsidies into account. An air-to-water heat pump initially costs about the same as a ground-source heat pump. The difference is the source for the ground-source system... with a €5,000 (for example, as we received) subsidy, it already makes a big difference. Our neighbors paid around €8,800 for drilling (and received a €5,500 subsidy), so after the subsidy, it was €3,300. That amount doesn’t take long to pay off.
We used a trench collector, which is definitely an extreme example. We paid less than €2,500 for materials plus excavator and operator (about €1,500 for materials, i.e., ground loop, manifold, antifreeze, house entry, cable ties, and €960 for excavation work). About 4 days of our own labor was added (plus one day of about 5 hours for laying the pipes by a friend, compensated with beer and steak). Roughly 2 full days went into planning the collector including research and ordering the materials, plus 2 days supervising the excavator and pipe laying. It was a fun project and, with the €5,000 subsidy, it was cost-effective right away, as after the subsidy it was cheaper than an air-to-water heat pump. However, the main reason wasn’t financial — we simply didn’t want an ugly unit standing outside the house, and I’m not a fan at all of exhaust air heat pumps that are installed entirely indoors.
Bookstar schrieb:
The heating method is not cost-effective with deep drilling, no matter the location. Air-to-water heat pumps are always more economical in Germany.
Air-to-water heat pumps have other disadvantages, which personally do not bother me.You seem to be quite knowledgeable, or do you just enjoy making general statements?
Do you tend to overlook the real cases presented here?
There is often a lot of discussion in forums without much evidence, unfortunately. I just checked again because a few years ago when I compared providers, the ground drilling plus the connections cost 18,000 euros. The air source heat pump was 13,000 euros cheaper after subsidies. This meant the payback period for the geothermal system was about 30 years. We decided against it and haven’t regretted it so far.
At that time, I requested quotes from four companies, and their prices were quite similar. Therefore, I think either it has become much cheaper since then (which is unlikely), people only share partial information (very likely), or prices vary significantly by region (possible).
At that time, I requested quotes from four companies, and their prices were quite similar. Therefore, I think either it has become much cheaper since then (which is unlikely), people only share partial information (very likely), or prices vary significantly by region (possible).
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