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.
C
chand198618 May 2018 23:11I understood it the same way. However, this would mean that many people, including those here in the forum, are not planning their underfloor heating optimally.
C
chand198618 May 2018 23:18So here’s a provocative question: Do modern, highly insulated houses with controlled residential ventilation systems still need underfloor heating in the bedrooms if the occupants prefer a cooler temperature there?
M
Mastermind118 May 2018 23:18Planning involves professional services that incur costs. Few companies inform the homeowner about this (after all, it costs money).
As a result, the planning is often very incomplete.
Heat load calculation according to DIN standards
Hydraulic plan / pipe sizing for underfloor heating with installation spacing
Ventilation concept
...
With the heat load calculation, you determine how much heating output is needed at a specific outdoor temperature below zero in winter. At the same time, the desired room temperatures are specified for each room.
Then the focus shifts to the underfloor heating, specifying the lowest possible supply temperature and the desired room temperatures or required heat output to achieve the room temperature.
This determines the pipe spacing in each room.
It usually turns out that the underfloor heating in the bathroom is not sufficient. In some cases, an additional wall heating might be necessary...
Many companies show little interest in homeowners requesting this, as it could reveal common execution errors. (Heat pump capacity too high, incorrect pipe spacing for underfloor heating, ventilation system piping too small...)
As a result, the planning is often very incomplete.
Heat load calculation according to DIN standards
Hydraulic plan / pipe sizing for underfloor heating with installation spacing
Ventilation concept
...
With the heat load calculation, you determine how much heating output is needed at a specific outdoor temperature below zero in winter. At the same time, the desired room temperatures are specified for each room.
Then the focus shifts to the underfloor heating, specifying the lowest possible supply temperature and the desired room temperatures or required heat output to achieve the room temperature.
This determines the pipe spacing in each room.
It usually turns out that the underfloor heating in the bathroom is not sufficient. In some cases, an additional wall heating might be necessary...
Many companies show little interest in homeowners requesting this, as it could reveal common execution errors. (Heat pump capacity too high, incorrect pipe spacing for underfloor heating, ventilation system piping too small...)
chand1986 schrieb:
I understood it that way too. But wouldn’t that mean that many people, including those here in the forum, are not optimally planning their underfloor heating?
chand1986 schrieb:
Then here’s the provocative question: Do modern, highly insulated houses with controlled ventilation systems still need underfloor heating in the bedrooms, especially if the occupants prefer the rooms to be cooler? Interesting question. Our underfloor heating in the bedroom hasn’t been used once in the past 6 years (KfW70, gas).
B
bierkuh8319 May 2018 05:30chand1986 schrieb:
Here’s a provocative question: Do modern, highly insulated houses with mechanical ventilation systems still need underfloor heating in the bedrooms if the occupants prefer cooler temperatures? An architect or structural engineer might be reluctant to design it that way, as there are likely regulations concerning the heating requirements for “living spaces.” As you can tell from the conditional phrasing, I am not an expert.
However, I can share that we have planned a small bay window area adjacent to the kitchen without underfloor heating. The door to the kitchen is kept closed because in winter, this space could serve as a sort of refrigerator substitute. The ratio of exterior wall to floor area is also disproportionately higher compared to the other rooms.
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