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.
Saruss schrieb:
The average values in the heat pump consumption database are different. I think it is good and appropriate to question things. That allows for reasonable and factual discussions on a topic.
May I ask for your personal opinion or experience? Do you have a ground-source heat pump with different, better, or worse experiences?
Have you possibly preferred gas for understandable reasons?
Or do you want to critically question this out of pure interest?
It doesn’t really matter if it’s a few years sooner or later. The payback period is well over 50 years. You can neither sugarcoat that nor deny it.
Economically, the air-source heat pump is generally preferable to the ground-source heat pump, unless subsidies distort the calculation...
Economically, the air-source heat pump is generally preferable to the ground-source heat pump, unless subsidies distort the calculation...
Joedreck schrieb:
I think it’s good and appropriate to ask questions. That way, a topic can be discussed reasonably and factually.
May I ask your personal opinion or experience? Do you have a ground-source heat pump with other, better, or worse experiences?
Have you perhaps preferred gas for understandable reasons?
Or do you want to question it critically out of pure interest? I have my own experience with my ground-source heat pump and about five air-to-water heat pumps in my immediate neighborhood. For comparable house sizes/living areas, there are always significantly larger differences than others describe. Of course, user behavior also plays a role but alone cannot explain such significant differences. For me, the ground-source borehole definitely "pays off" compared to the consumption levels in my area after about 25 years, assuming electricity prices remain stable and do not increase.
The colder the region where you live, the more this shifts in favor of the ground-source heat pump.
@Bookstar there is no payback period since heating systems only cost money and do not generate income. Neither optimistic calculations nor drinking will help with that.
Especially with heat pumps, correct sizing and user behavior play a crucial role.
High supply temperatures, on/off operation, and/or room thermostats, possibly with a buffer tank, often reduce efficiency.
Therefore, my advice is to invest well in the planning stage. Even then, we are still looking at roughly 60 years until the more expensive option (ground-source heat pump) becomes cost-effective.
Could you share the exact energy consumption of your neighbors and yourself, including living area and "energy standard"? That would certainly provide a useful practical reference for future home builders.
High supply temperatures, on/off operation, and/or room thermostats, possibly with a buffer tank, often reduce efficiency.
Therefore, my advice is to invest well in the planning stage. Even then, we are still looking at roughly 60 years until the more expensive option (ground-source heat pump) becomes cost-effective.
Could you share the exact energy consumption of your neighbors and yourself, including living area and "energy standard"? That would certainly provide a useful practical reference for future home builders.
All information about my house has already been shared here. I do not disclose any details about my neighbors for privacy reasons.
My situation covers a flexible period of about 25 years. I strongly reject the general assumption of 60 years.
In any case, planning should always be done properly.
My situation covers a flexible period of about 25 years. I strongly reject the general assumption of 60 years.
In any case, planning should always be done properly.
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