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.
Lumpi_LE schrieb:
If you turn up all the rooms fully and the heating curve is set correctly, one room will reach the target temperature (e.g., 22°C (72°F)) while all the others will be warmer. You then have to throttle the valves in those rooms. That’s why referring to the coldest room is actually correct.OK, understood. I more or less skipped this step because I didn’t turn all the valves fully open again, only in the rooms where the highest target temperature was supposed to be (bathroom and living room). Naturally, this resulted in colder rooms elsewhere. I approached the optimal comfort temperature from below this way.
We have a passive cooling system ourselves, and I would definitely choose it again. It helps to remove some of the heat outside during the summer — of course, it’s not comparable to an active air conditioning system, but it comes with virtually no running costs and is quite environmentally friendly.
However, we have hardwood flooring almost everywhere, so you can comfortably walk barefoot in the summer despite the cooling. On tiles, it might feel cold.
However, we have hardwood flooring almost everywhere, so you can comfortably walk barefoot in the summer despite the cooling. On tiles, it might feel cold.
Good evening everyone,
I’m new here and have only been a passive reader until now. We have gradually started our building project. For the heating system, we plan to install a ground probe with a brine-water heat pump. Although I thought I was well informed and had done my calculations, I am now quite uncertain regarding the costs: We are building in the far south of Bavaria (Alpine foothills) – where drilling costs seem to be significantly higher than in the north – what do you think about the following quote:
Quote:
Ground probe drilling by Baugrund-Süd: 15,000 euros
Heat pump including installation: 12,000 euros (4.8 kW)
Minus the subsidy of 4,500 euros = 22,500 euros
According to the quote, everything is included in this price.
I think the cost for the heat pump including installation is reasonable, but the probe seems quite expensive to me. How do you assess this? Is this still within the usual range? Baugrund-Süd is probably the Mercedes among probe drilling companies, right? We are likely to drill between 100 and 110 meters (330 and 360 feet). Thanks in advance for your feedback!
I’m new here and have only been a passive reader until now. We have gradually started our building project. For the heating system, we plan to install a ground probe with a brine-water heat pump. Although I thought I was well informed and had done my calculations, I am now quite uncertain regarding the costs: We are building in the far south of Bavaria (Alpine foothills) – where drilling costs seem to be significantly higher than in the north – what do you think about the following quote:
Quote:
Ground probe drilling by Baugrund-Süd: 15,000 euros
Heat pump including installation: 12,000 euros (4.8 kW)
Minus the subsidy of 4,500 euros = 22,500 euros
According to the quote, everything is included in this price.
I think the cost for the heat pump including installation is reasonable, but the probe seems quite expensive to me. How do you assess this? Is this still within the usual range? Baugrund-Süd is probably the Mercedes among probe drilling companies, right? We are likely to drill between 100 and 110 meters (330 and 360 feet). Thanks in advance for your feedback!
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