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.
M
MeisterBob1 Jan 2016 20:12Addendum: I cannot determine the exact energy amounts for one year since I did not accurately record the values at move-in in November 2014 or November 2015. However, I will monitor the next year to be able to precisely calculate the annual performance factor.
S
Sebastian791 Jan 2016 20:55That doesn’t change the fact that this system not only required very, very high investments but also performs poorly – it really makes your heating costs very expensive, so the heating system will practically never pay for itself.
Of course, it’s good that you’re satisfied – but this could be achieved, somewhat exaggeratedly, with about half the cost.
I don’t want to know how often the heat pump cycles on and off…
Of course, it’s good that you’re satisfied – but this could be achieved, somewhat exaggeratedly, with about half the cost.
I don’t want to know how often the heat pump cycles on and off…
You can (within limits) configure the cycling frequency (for example, by adjusting the heating circuit’s hysteresis).
The advantage of relatively frequent cycling with brine systems is a higher brine temperature compared to long continuous operating times. However, if the cycles are too short, the heat pump will not operate efficiently. It is important to find a good balance for each individual system (the thermal storage and the inertia of the screed are generally large enough, so you can "play around" with the settings). According to other forums, wear and tear on the unit is generally not a problem nowadays.
The advantage of relatively frequent cycling with brine systems is a higher brine temperature compared to long continuous operating times. However, if the cycles are too short, the heat pump will not operate efficiently. It is important to find a good balance for each individual system (the thermal storage and the inertia of the screed are generally large enough, so you can "play around" with the settings). According to other forums, wear and tear on the unit is generally not a problem nowadays.
S
Sebastian791 Jan 2016 21:07I didn’t say that the lifespan is affected, but that it operates inefficiently and probably cycles endlessly.
And with two (!!) buffer tanks, there is hardly anything you can do to fix it...
And with two (!!) buffer tanks, there is hardly anything you can do to fix it...
Sebastian79 schrieb:
True, there’s no real substance in all that talk, but at least it’s a lot of chatter . Thank you for the valuable information.
Apparently, you didn’t actually read the text. And look for any valuable information in your recent posts.
I am already requesting a moderator to remove our posts because it seems you have switched to an unconstructive mode.
PS: I sincerely hope that some kind of construction-related stress is not to blame.
S
Sebastian791 Jan 2016 21:44But the main thing is that your stage here will still be around for a while – you sure do talk a lot.
And no, I’m not stressed about the construction – otherwise, I definitely wouldn’t be hanging out here.
And no, I’m not stressed about the construction – otherwise, I definitely wouldn’t be hanging out here.
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