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.
T
T_im_Norden7 Aug 2020 15:07PS: Shading is, of course, mandatory.
Ybias78 schrieb:
It is said:
A) Mechanical ventilation with heat recovery is not designed for cooling
B) Passive cooling has little effect.
How is it that you can cool down so much? Which brine-to-water heat pump and mechanical ventilation system with heat recovery do you use? Regarding A: it hardly cools either, as air is a poor medium in terms of heat capacity. However, it helps against high humidity because of the continuous air exchange with the outside...
I don’t have a geothermal heat exchanger or anything similar installed before the mechanical ventilation with heat recovery system. However, the ducts for the central mechanical ventilation run through the cool concrete ceiling.
I’m not sure where the idea comes from that passive cooling doesn’t help. My heating engineer mentioned a cooling effect of 3 to 4 degrees. I find the difference between 22°C (72°F) in the bedroom and 26°C (79°F) quite significant.
The ground-source heat pump I have is exactly the one the original poster asked about. The mechanical ventilation system I use is from a manufacturer with a name similar to “Zahnder.” I prefer not to provide more details since I have already received a warning due to brand mentioning.
I’m not sure where the idea comes from that passive cooling doesn’t help. My heating engineer mentioned a cooling effect of 3 to 4 degrees. I find the difference between 22°C (72°F) in the bedroom and 26°C (79°F) quite significant.
The ground-source heat pump I have is exactly the one the original poster asked about. The mechanical ventilation system I use is from a manufacturer with a name similar to “Zahnder.” I prefer not to provide more details since I have already received a warning due to brand mentioning.
P
pagoni20207 Aug 2020 15:21annab377 schrieb:
@guckuck2 you can also add automatic shading using a light sensor and blinds .....praise to automation-. We have exactly the same setup as @guckuck2. Glass-covered terrace AND venetian blinds, both retrofitted after several years, were the best decisions!!! When it comes to the new house, everything is up for discussion—except this!
Woogl schrieb:
I don’t have a ground heat exchanger or anything like that in front of the mechanical ventilation with heat recovery. But the ducts of the central mechanical ventilation run through the cool concrete ceiling...
I don’t know where the idea comes from that passive cooling doesn’t work. My heating contractor mentioned 3 to 4 degrees. And I find the difference between 22°C (72°F) in the bedroom and 26°C (79°F) quite significant.
I have the brine heat pump exactly like the one the original poster asked about. My mechanical ventilation system is from a manufacturer with a name sounding somewhat like Fisch Zahnder. I prefer not to say more, since I have already received a warning for mentioning brand names.In my house, I have passive cooling (plus shading, of course). I have never had issues with humidity; the dew point sensor has never been triggered. Ecological, inexpensive, comfortable... what more could I want? It’s the second best investment in the whole house right after the mechanical ventilation with heat recovery. And the passive cooling module cost less than €1,000 (about $1,060) in my case; running costs are completely negligible compared to a regular air conditioning system.
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