How do temperature fluctuations occur in fresh water?

  • Erstellt am 2020-01-02 12:23:29

Domski

2020-01-05 22:46:53
  • #1
Lowering the buffer temperature could help with overshooting. However, this can only be found out by experimenting in the end. As long as you don’t know the cause....

The buffer circuit has a mixer before the fresh water. I would now suspect that or the loading pump.

The domestic hot water actually does not pass through a mixer. At most, that is the return flow of the circulation, which hopefully feeds back into the cold water line before the plate heat exchanger via a check valve. By the way, that would also be another idea, maybe the check valve is not tight and you are getting cold water into the hot water line through the circulation.

What kind of fresh water system is that actually (manufacturer, type)?
 

fonsi99

2020-01-06 09:53:18
  • #2
Hello. We have a good one from Sailer. Friwast50plus. I will take a look at the exact temperatures of all thermometers running fresh water during the day. Thanks already. PS: What actually happens if in summer the solar system heats the buffer completely up to 70 degrees, but I then run the fresh water setpoint at 50 degrees? Then the domestic hot water mixer cannot mix to 55 degrees because the tank is at a full 70 degrees (when the sun is shining fully)! Then the buffer feeds the fresh water at 70 degrees, although it only needs to produce 50 degrees... Just thought I'd mention this in case I want to set the fresh water to 50 degrees someday...
 

Domski

2020-01-06 10:17:16
  • #3
Of course, the one at the fresh water can then produce 50 degrees.
 

fonsi99

2020-01-06 10:21:11
  • #4

But doesn't that then promote limescale formation? And doesn't it lead to larger temperature fluctuations? Or does it not matter at what flow temperature the fresh water is operated?
What matters is the temperature that the fresh water produces in the heat exchanger. At 50 degrees, limescale formation would not occur.
 

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