Experiences with brine heat pump

  • Erstellt am 2015-10-23 21:40:36

Saruss

2015-10-23 21:40:36
  • #1
Hello,
here I would like to present, among other things following Epis' "Question Catalog," some experiences and values of my brine heat pump and deep drilling:

a) What is the soil composition of your property?
up to 3m silt, fine sandy, clayey (clayey soil)
up to 4m scree slope, rock fragments
then rock (predominantly limestone)

b) How deep was the drilling?
It was drilled 2x72m deep

c) How expensive was the drilling?
€10,400 including double U-probes DN25
grouting material with 2.0 W/mK conductivity
approval process
pressure-tight house entry in the basement and laying the supply line underground (after all 25m)
filling/draining device, filling, pressure test, etc. (so all-inclusive)

d) How expensive was the system?
System: Tecalor TTc 05 with heat output at B0/W35 of 5.8 kW at a performance factor of 4.8
Cost: €9800

e) Were there difficulties in installing the system, if so what kind?
Because the water used during drilling to flush out the drilled material seeped away, a "small compressor" had to be brought in that blew it out with air. However, this was allowed to stand on the neighbor's property, who had not yet started building (the machine was the size of a 20-ton truck, and probably the weight too, but it was all-terrain). This caused a 2-day delay because it first had to be driven to us. No additional costs were charged.

f) How is the handling in everyday use?
"Like a refrigerator." Once the parameters on the heating system are properly set, the only thing you can (should!) do is occasionally read the information/data such as operating time, source temperature. Otherwise, it runs "on its own" like all heating systems. With the door closed, the device is virtually inaudible. Very inconspicuous, since apart from the unit in the utility room, nothing is visible (brine pipes are all underground).

e) What are the costs for which living area?
Currently, a living area of 180 sqm is heated; a further 65 sqm are basement rooms within the insulated building envelope (these are around 15-16 degrees warm on the coldest days). For heating and hot water (2 adults, 1 baby, 1 toddler) from September 2014 to September 2015, 2000 kWh of electricity was consumed. This is a KfW-70 house according to the 2009 Energy Saving Ordinance (which, even without the installed central ventilation system with enthalpy heat exchanger, already had the corresponding system technology value; we decided on this after the initial applications).

f) to be continued ....

Note for the comparison of the performance factor (COP):
The system has so far had a COP of about 5.5 since the optimization of the heating curve and settings at the end of last year. Operating hours are about 1200; the deep drilling was made approximately 20% deeper than suggested by the companies at my own request.
 

Bauexperte

2015-10-23 22:41:42
  • #2
Good evening ,

thank you very much for your effort!

I have pinned your post at the top in the subforum (so here) so that it does not get lost in the daily upload of questions. I am sure many users will be happy to have it at hand at any time.

Rhenish greetings
 

frankenbau

2015-10-23 23:00:09
  • #3
Thank you. Very informative.
 

peter_segel

2015-10-25 22:06:08
  • #4
Hello! Why did you drill 20% deeper? Special reason?
 

Saruss

2015-10-25 22:37:01
  • #5
I have calculated the extraction capacity via building properties (heating capacity/annual heat demand) and rock "capacity" myself for worse cases (e.g., the rock type has 55-70W per meter extraction capacity at 1800 operating hours, less with longer operating time), and in my opinion the 20% was necessary. The only thing that is not so easy to change is the drilling once the property and terrain are finished. On the other hand, the heat pump benefits if the drilling is longer and the brine temperature is higher. Furthermore, the costs for a longer drilling are not proportional to the total costs, drilling engineers just need a little longer to drill, all fixed costs are simply fixed :P (travel, connection, etc.)
 

djon25

2015-11-09 21:06:44
  • #6
hello,
how much heating-up cost can be expected for the heat pump (via electricity)??
 

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