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.
BeHaElJa schrieb:
What are your current brine outlet temperatures at the end of the cycle? I’m already at 0.2°C (32.4°F) – and I’m afraid that’s not very good – I definitely need to ask the well driller again.No reason to worry at all. With a brine outlet temperature of 0.2°C (32.4°F), your inlet temperature should be around 4°C (39.2°F).
Where do you see a problem?
By now, things have stabilized somewhat. Currently, the brine inlet temperature at the end of a cycle is about 2.6°C (36.7°F) and the brine outlet temperature is around 1.2°C (34.2°F). The temperature difference is relatively small in our case.
I was just a bit shocked because I thought it would continue to decline, but the borehole seems to recover quite well during milder winter days.
Saruss appears to be more of an exception with his 5°C (41°F) outlet temperatures at the end of the winter cycles.
I was just a bit shocked because I thought it would continue to decline, but the borehole seems to recover quite well during milder winter days.
Saruss appears to be more of an exception with his 5°C (41°F) outlet temperatures at the end of the winter cycles.
BeHaElJa schrieb:
Things have settled down a bit by now. At the end of each cycle, the brine inlet temperature is around 2.6°C (36.7°F) and the outlet temperature about 1.2°C (34.2°F). The temperature difference is quite small in our case.
I was a bit shocked at first because I expected the temperature to keep dropping, but the borehole seems to recover fairly well during milder winter days.
Saruss appears to be more of an exception with their 5°C (41°F) outlet temperatures at the end of winter.You have a temperature difference of 1.4°C (2.5°F)? That’s definitely not ideal. What kind of house is it, what size, insulation standard, which heat pump, and can you provide more details about the borehole?
What does it really mean to have a 5°C (41°F) outlet at the end of winter? If my borehole was 250 meters (820 feet) instead of 120 meters (394 feet), I would have that too. But at what cost? It always depends on the entire system/design with a heat pump installation, including the source, heat pump, and underfloor heating.
We have two boreholes, each 70 meters (230 feet) deep, with a 10-meter (33 feet) supply line to the house.
I believe the extraction rate was about 43 W/m (watts per meter) (the specifications are still in the box) — definitely better than the 39 kW reported from the neighboring property according to LBeg.
The grouting was done with Thermocem Basic (unfortunately — we didn’t know about this).
The house has 190 m² (2,045 ft²) of living space, a 5.3 kW Flexothem Exclusive system, and a heating load of 5.5 kW based on our calculated U-value, and 6.3 kW according to Vaillant; I trust the U-value calculation more than Vaillant’s estimate, since Vaillant did not really factor in heat recovery from the ventilation system (0.5 kW difference with the U-value method; 1.5 kW difference with Vaillant’s figure for required heating to compensate for minimum air exchange).
I’m checking the live data again:
Energy integral at: -100 minutes (started at -120 minutes)
Target flow temperature: 27.5°C (81.5°F)
Actual flow temperature: 29.5°C (85.1°F)
Ground loop inlet temperature (brine inlet): 3.4°C (38.1°F)
Ground loop outlet temperature (brine outlet): 1.6°C (34.9°F)
Heating curve set to 0.1 with a desired room temperature of 23°C (73.4°F) (this is just the offset).
I believe the extraction rate was about 43 W/m (watts per meter) (the specifications are still in the box) — definitely better than the 39 kW reported from the neighboring property according to LBeg.
The grouting was done with Thermocem Basic (unfortunately — we didn’t know about this).
The house has 190 m² (2,045 ft²) of living space, a 5.3 kW Flexothem Exclusive system, and a heating load of 5.5 kW based on our calculated U-value, and 6.3 kW according to Vaillant; I trust the U-value calculation more than Vaillant’s estimate, since Vaillant did not really factor in heat recovery from the ventilation system (0.5 kW difference with the U-value method; 1.5 kW difference with Vaillant’s figure for required heating to compensate for minimum air exchange).
I’m checking the live data again:
Energy integral at: -100 minutes (started at -120 minutes)
Target flow temperature: 27.5°C (81.5°F)
Actual flow temperature: 29.5°C (85.1°F)
Ground loop inlet temperature (brine inlet): 3.4°C (38.1°F)
Ground loop outlet temperature (brine outlet): 1.6°C (34.9°F)
Heating curve set to 0.1 with a desired room temperature of 23°C (73.4°F) (this is just the offset).
S
Sebastian7919 Feb 2016 12:11How cold is it where you are that the supply temperature is already that high?
You mentioned before that you had a heating load calculation done – but I don’t see any reference to a DIN standard calculation. And please don’t say that the U-value calculator is enough – I know you like to experiment with it, but for something this important, I would have had a professional do it.
Those few euros you saved now…
You mentioned before that you had a heating load calculation done – but I don’t see any reference to a DIN standard calculation. And please don’t say that the U-value calculator is enough – I know you like to experiment with it, but for something this important, I would have had a professional do it.
Those few euros you saved now…
Vaillant performed the HLB according to DIN EN 12831, German annex 07/2008 is indicated – I did mention that.
Well, it was -2°C (28°F) last night. We're still adjusting things a bit – we only moved in a week ago. It's possible that the day after tomorrow we'll lower the curve a bit again; you really notice the effect of your adjustments only after 1-2 days.
Well, it was -2°C (28°F) last night. We're still adjusting things a bit – we only moved in a week ago. It's possible that the day after tomorrow we'll lower the curve a bit again; you really notice the effect of your adjustments only after 1-2 days.
Similar topics