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.
Tego12 schrieb:
Costs for trench collector under €2,500; subsidy €4,500. Compared to an air-to-water heat pump, that saves money, plus lower ongoing heating costs, and the passive cooling alone is worth its weight in gold, no annoying outdoor unit... Annual performance factor >5.5...
A rough estimate, since the trench collector was built as DIY.. I know. But including planning, it took less than 3 days. Yes, that’s great. In this context, I just remembered something I left out: if you spend €12,000 on, for example, an air-to-water heat pump from Nibe, it becomes cost-effective quite quickly. I have a significantly cheaper air-to-water heat pump, which makes a brine-to-water heat pump not worth it by comparison.
We are planning a KfW 40 Plus single-family house in NRW with a ground source heat pump, a ventilation system, as well as a photovoltaic system with 6.3 kWp and a battery storage with 6.4 kWh. Key data: 200 m² (2,153 sq ft) living area, 50 m² (538 sq ft) usable area (garage/basement/both heated), 4 people, including 2 small children.
The heat pump manufacturer told me that I only need a cooling capacity of 4.6 kW for this. They believe that a heating capacity of 6 kW is fully sufficient. Naturally, this worries me a lot, especially when I compare the drilling depth to your examples. The planned drilling length for me is only 99 m. What do you think?
The quotes for the drilling vary extremely, ranging from about 5,500 EUR to 12,000 EUR. What should I pay attention to when comparing drilling prices?
Which heat pump would you recommend to me?
The heat pump manufacturer told me that I only need a cooling capacity of 4.6 kW for this. They believe that a heating capacity of 6 kW is fully sufficient. Naturally, this worries me a lot, especially when I compare the drilling depth to your examples. The planned drilling length for me is only 99 m. What do you think?
The quotes for the drilling vary extremely, ranging from about 5,500 EUR to 12,000 EUR. What should I pay attention to when comparing drilling prices?
Which heat pump would you recommend to me?
B
boxandroof1 Jan 2020 20:02Perform a room-by-room heating load calculation and design the underfloor heating based on this, using a low flow temperature (e.g., 30°C (86°F)). The result will also show the heating load for the entire house, allowing you to appropriately size the heat pump.
boxandroof schrieb:
Perform a room-by-room heating load calculation and design the underfloor heating based on this, using a low supply temperature (e.g., 30°C (86°F)). As a result, you will also see the heating load for the entire house and can appropriately size the heat pump.There is not much more to add.Similar topics