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.
Well, modulating heat pumps are all well and good, but as long as they don’t cycle on and off 30 times a day, it’s not a big deal. These units are designed for that, and not just recently. You hardly find models smaller than 6kW (20,000 BTU/h).
With modulating ground-source heat pumps, you always have the problem with the heat source. Everyone raises their hands and doesn’t want to know about any warranty when the heat pump really ramps up. They don’t modulate from 1 to 6kW (3,400 to 20,500 BTU/h), but for example from 2 to 9kW (6,800 to 30,700 BTU/h).
The cost-effectiveness is also questionable, as modulating ground-source heat pumps are found in the higher price range. The mentioned Weishaupt (actually a Dimplex) heat pump is a solid, but basic system. You can expect to pay a few thousand more for a modulating version, especially if it’s a Nibe.
With modulating ground-source heat pumps, you always have the problem with the heat source. Everyone raises their hands and doesn’t want to know about any warranty when the heat pump really ramps up. They don’t modulate from 1 to 6kW (3,400 to 20,500 BTU/h), but for example from 2 to 9kW (6,800 to 30,700 BTU/h).
The cost-effectiveness is also questionable, as modulating ground-source heat pumps are found in the higher price range. The mentioned Weishaupt (actually a Dimplex) heat pump is a solid, but basic system. You can expect to pay a few thousand more for a modulating version, especially if it’s a Nibe.
Joedreck schrieb:
Regarding the trench collector, you could check in the house construction forumYes, you can also find company recommendations thereI don’t think modulation is necessary. I have a 5.8 kW heat pump, with a heating load calculated at about 5.5 kW (due to the ventilation system’s enthalpy heat exchanger, it’s actually a bit less), but this is based on -25°C (−13°F). Most winter and spring days here are closer to 0°C (32°F), which is well below half of the design load. However, I still don’t have any issues with short cycling – modern homes are so well insulated, and the screed has an incredibly high heat capacity, so under these conditions, the heat pump typically cycles only 4 to 5 times a day. We are now in our sixth year living in the house and have very good energy consumption figures. I don’t believe a modulating heat pump would perform any better (seasonal performance factor > 6).
Saruss schrieb:
We have now been living in the house for six years and have very good energy consumption figures. I don't believe a modulating heat pump would perform better (seasonal performance factor > 6).Could you share some details about the setup? Heated area, domestic hot water storage size, hot water temperature, hysteresis, flow temperatures, etc.?
Your system seems to be running really well!
Edit:
Okay, page 1 is worth reading.
Heinz2k schrieb:
I’m curious about your annual consumption figures. We are approaching our first year and will end up at around 1,500 kWh of electricity (heating + hot water, 4 people). We use about that much just for hot water over the summer for two people when I estimate it. It’s amazing how you manage with so little.
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