Hello,
here I would like to share some experiences and data regarding my brine heat pump and deep drilling, based in part on the expertâs "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?
âŹ10,400 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: âŹ9,800
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 neighborâs 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 expertâs "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?
âŹ10,400 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: âŹ9,800
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 neighborâs 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.
You would think Vaillant can handle this... it is also listed with its 85% efficiency, 1.5 kW (1.5 kW) output to compensate for ventilation, but thatâs too much. Furthermore, the blower door test result was set at 1.5 instead of 0.66.
We donât have an ERR, no buffer tank, everything goes directly into the underfloor heating â hydraulic balancing was roughly carried out. The builder said he will come back to take a closer look and make precise adjustments. However, I donât really have issues with heat accumulating, and the temperature is roughly the same everywhere.
Currently, the energy integration is at -30 minutes and the brine temperatures are 2.8°C (37°F) and 1.1°C (34°F) (it will run like this for about 10 more minutes until the cycle ends). Iâm not sure if I can see the flow and return temperatures of the heating system.
We donât have an ERR, no buffer tank, everything goes directly into the underfloor heating â hydraulic balancing was roughly carried out. The builder said he will come back to take a closer look and make precise adjustments. However, I donât really have issues with heat accumulating, and the temperature is roughly the same everywhere.
Currently, the energy integration is at -30 minutes and the brine temperatures are 2.8°C (37°F) and 1.1°C (34°F) (it will run like this for about 10 more minutes until the cycle ends). Iâm not sure if I can see the flow and return temperatures of the heating system.
cumpa schrieb:
Are the 65 sqm (700 sq ft) in the basement unheated? Or partially heated? Do you have a door to the basement or an open stairwell? Currently, 65 sqm (700 sq ft) of the basement are unheated. However, the stairwell is open, and all basement doors are kept open because of the pets.
Regarding B., I would wait with any "assessment" until everything is properly adjusted and balanced. The temperatures are currently good for the hydraulic balancing, but this process takes quite a while because a house reacts very slowly to small changes in heating settings.
I installed a radiator and "fan" combination in those rooms because I use the rooms (workshop/hobby room, etc.) only intermittently (for example, a few hours in the evening). This allows me to raise the air temperature relatively quickly (even with a low supply temperature), as there is usually only a 4-5°C (7-9°F) difference at most.
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