Clicking sounds in the circulatory system during thermal stagnation

  • Erstellt am 2023-10-31 13:18:47

Thorsten63

2023-10-31 13:18:47
  • #1
Dear house construction forum members,

I operate a heat pump system (Buderus WPS-10, geothermal) with a storage tank as well as solar thermal support (2 x Braas TK8) in our single-family house.

When the sun shines very strongly in summer and the system goes into thermal stagnation, meaning the circulation pump switches off, there are persistent ticking noises in the attic, somewhere around where the connection of the hoses of the solar collector modules with those leading to the basement to the storage tank is located, as if someone had hidden an alarm clock behind the drywall of the roof.

I reported this as a defect to the heating engineer and expressed my suspicion that cavitation was occurring there and my concern that this could lead to material wear in the long term.

After the service technician was finally able to witness the effect live (the sun has to be shining), he adjusted the setpoint or limit/alarm values of the system. As a result, there was a daily alarm value exceedance at the heat pump whenever the sun shone, and it beeped in the basement every day and the alarm had to be acknowledged.

For a time, I then dissipated the heat through the collectors again at night by manually switching the controller to manual in the evening and turning on the pump. However, this is very inconvenient, so I reset the limit values, after which the ticking noises returned.

A — repeated — call to the heat pump manufacturer (Buderus) and an email were completely useless—I might as well have asked my grandma. These people appear to be there only to take phone calls—without any technical expertise.

I actually maintain a not-so-bad relationship with the heating engineer, but I fear this also exceeds his competence. At any rate, he is very reserved on this issue and anything but proactive.

Therefore, my question here in the forum to you: Has anyone ever experienced this phenomenon themselves or heard of it and perhaps knows what can be done about it?

The system is at about 2.5 bar in the basement, thermal stagnation sets in at about 150 °C, then the pressure rises to about 4.5 bar, the temperature up to max. 190 °C.

Thank you very much and best regards Thorsten
 

KingJulien

2023-11-01 04:55:20
  • #2
That is a very specific and technical question, for that I would definitely drop by the "Rosa" Fo... There are, among others, the heating engineers around.
 

Benutzer 1001

2023-11-01 20:22:37
  • #3

We had something similar: the supply and return lines to the heat storage tank coming from the heat pump were swapped.
 

Thorsten63

2023-11-02 13:03:18
  • #4

Hello KingJulien,
thanks for the tip!
Best regards
Thorsten
 

Thorsten63

2023-11-02 13:08:26
  • #5
Hello Offtopic, thank you very much for your post. That’s exciting! I will definitely look into it further! Such things can indeed easily happen to the professional craftsman. In our case, hot water was also connected to the toilet, resulting in warm flushing and condensate dripping from the water tank. Took off the tile and swapped the connection, and just like that, it was fixed! If it were that easy here, much would already be achieved! One question though: What does "wgt" mean? Best regards Thorsten
 

Benutzer 1001

2023-11-03 09:30:39
  • #6
Wgt is the controlled residential ventilation; it has a heat exchanger to preheat the fresh air after heat recovery so that no drafts occur.
 

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