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.
@Sebastian79, have you already put your FlexoTherm into operation?
We have been using ours for about a week now and are experiencing the issue that it occasionally shows "brine outlet temperature too low" (which requires a reset), because it is factory-set to a minimum brine outlet temperature of +2°C (36°F) for frost protection. I firmly believe (and the pink forum agrees) that this is a misconfiguration... but the heating engineer actually called Vaillant about it, and they said it is supposed to be that way -.- A Vaillant service technician will come again in the new year, and I hope they will lower the setting... just for your information, in case you find it relevant.
We have been using ours for about a week now and are experiencing the issue that it occasionally shows "brine outlet temperature too low" (which requires a reset), because it is factory-set to a minimum brine outlet temperature of +2°C (36°F) for frost protection. I firmly believe (and the pink forum agrees) that this is a misconfiguration... but the heating engineer actually called Vaillant about it, and they said it is supposed to be that way -.- A Vaillant service technician will come again in the new year, and I hope they will lower the setting... just for your information, in case you find it relevant.
The default password for the advanced settings on my heat pump was not changed, which means you can also modify parameters like that. Maybe you could give it a try (it’s probably listed in one of Vaillant’s manuals or online). It’s definitely worth a shot.
However, in my case, the temperature has never dropped that low so far.
However, in my case, the temperature has never dropped that low so far.
I have the passwords and so on – I could adjust it, but I don’t really want to (in case I mess something up and the warranty is void).
The brine outlet temperature never drops below +2°C (36°F) for you? What heating load do you have at how many drilling meters (and what extraction capacity does your ground have)?
Isn’t the COP even specified at 0°C (32°F) brine inlet temperature?
The brine outlet temperature never drops below +2°C (36°F) for you? What heating load do you have at how many drilling meters (and what extraction capacity does your ground have)?
Isn’t the COP even specified at 0°C (32°F) brine inlet temperature?
S
Sebastian7931 Dec 2015 16:24My pump is still at the dealer’s – I don’t even have screed yet.
M
MeisterBob31 Dec 2015 17:55After almost exactly 1 year living in the house, with about 200 sqm (2,150 sq ft) of heated area and an average indoor temperature of 20°C (68°F). Timber frame construction, KfW 55 standard, ground-source heat pump from Buderus. Approximately €411 for heating and hot water in the first year (excluding any new customer bonus from the electricity provider). However, we also use a hydronic fireplace for additional heating, which we operate daily in winter. Additionally, we have large south-facing windows that warm the house for free during sunny winter days—just open the blinds...
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Sebastian7931 Dec 2015 18:01Pocket fireplace with a heat pump? So also a buffer tank?
It would be more interesting to see the consumed kW rather than a cost amount.
It would be more interesting to see the consumed kW rather than a cost amount.
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