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.
Bookstar schrieb:
So this is about how much hot water we need for two people in summer, when I calculate it. It’s a wonder how you manage it.The real wonder is probably how YOU manage it.
What are your consumption habits like?
In fact, our hot water energy demand is also higher than what is mentioned in other reports. We don’t get below 100 kWh of electricity per month in summer, just for hot water. This is probably due to the rather wasteful "lawyer’s shower," which mists very finely and is therefore turned up quite warm. The hot water storage temperature is set to 46 degrees Celsius (115 degrees Fahrenheit), usually with 2 heating cycles for hot water per day.
RoyalTS schrieb:
Thanks Saruss for your initial assessment, here are some additional details:
Ground Probe:
- Factory-welded double U-probe(s) made from polyethylene PE-RC
- Grouting of the annular space with marked frost- and freeze-thaw resistant backfill material, starting from the probe base upwards
- Automatic monitoring of the sealing process within the borehole and documentation
- 10-year warranty on extraction performance, fully insured drilling, all services from a single source, documentation included, including expert appraiser and all ground and connection work (including basement core drilling)
Heat Pump:
Weishaupt WWP S 6 IDT-2, heating capacity 6.1 kW (21,000 BTU/h), coefficient of performance 4.8, with integrated 170-liter (45-gallon) hot water storage tank. The offer also includes: reference room controller, make-up water unit, expansion vessels, valves/connection materials, labor for installation and commissioning. Maybe consider getting an additional quote from this company. Our boys were very satisfied, but I’m not sure if they operate in your area.
guckuck2 schrieb:
The price for drilling mainly depends on the drilling depth and the type of ground. These details are missing.
The scope of services shown is also neither complete nor exceptional. Apparently, no enhanced grout material is used; otherwise, it would have been mentioned. In an “all-in” offer, I would also expect the disposal of drilling mud including container and fresh water consumption, as well as the complete administrative processing including the application for subsidies.
The insurance, on the other hand, is nothing special and only requires a signature. Thank you for your input, it helps a lot! Here are some additional details:
- Disposal of drilling mud, if not possible via sewage system (flat rate +500 euros)
- Backfill material is standard with a thermal conductivity of about 1 watt 🙁
- Administrative processing and so on are all included.
As mentioned: about 15,000 euros for 4.8 kW (guaranteed). What do you think? I will definitely get more offers.
I still have another question regarding the system design (I’m really a beginner on this topic and hope this isn’t a dumb question):
1. Heat load vs. probe size: Does the capacity of the probe have to exactly match the calculated heat load? Or slightly less? Or more? Do I have to add domestic hot water demand to the DIN heat load?
2. Specifically, we have a calculated heat load (DIN EN 12831) of 5.1 kW. This already excludes all basement rooms – we want to heat two of those rooms. Including these, the heat load comes to 6.3 kW. We also have a mechanical ventilation system with heat recovery. Assuming 80% recovery of ventilation heat losses, we gain about 1.3 kW. So in total, this results in 6.3 kW – 1.3 kW = 5 kW heat load. If this is correct, my probe with a guaranteed capacity of 4.8 kW would be slightly undersized, right? (Gap of 0.2 kW)
3. Would improved grout material help here? I read in a forum that this can increase performance by up to 10-15% – then I would be safe?
4. The 6.1 kW heat pump from Weishaupt (WWP S 6IDT-2) fits well with this system, right?
5. Friends told me that you also have to pay for an expert who supervises the drilling – is that always the case?
For me, the flat fee included disposal (without using the sewage system) and better backfill material. I also specified the drilling depth in advance (a guaranteed performance would have been too vague for me – depending on how the calculations are done and what the ground conditions allow, you might end up being sold a drilling depth that’s too short). I had the drill go a bit deeper, but the extra meters were not even that expensive in the overall comparison. Now it seems a bit more expensive to me.
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