Controlled residential ventilation and still open windows at night

  • Erstellt am 2016-08-30 14:23:28

AOLNCM

2016-09-01 16:39:00
  • #1


Thanks for the explanations.

- I was now able to understand where Delta T comes from, thanks.

- I know it this way, that even the highest level (party mode) is pre-set at about 3/4 of the max. power from the factory. If one wants to push 400 m³/h at night, an oversize system for many single-family homes is required, or the power of the highest level has to be raised to 100% at the expert level, which should be detrimental to the service life of the system. The power consumption during this time would correspond approximately to 2 to 3 lamps of 60 watts each switched on overnight.

- The unit watt times hour is correct, only in this calculation the night apparently lasts exactly one hour. However, if the night operation should last for e.g. 10 hours, then the total energy must be divided by the number of hours to get the power [watt].

@TE sorry for OT.
 

Bieber0815

2016-09-01 22:37:01
  • #2
How so, if I may ask? So what is the conclusion for you?
 

Kaspatoo

2016-09-01 23:16:30
  • #3
see also my comment #20:

"
[...]
ok, then I think I have understood it now:
make sure that it just blows and has no control technology, then you can also easily open windows
higher wear may or may not occur
[...]
"
 

Payday

2016-09-02 13:27:55
  • #4
so:

theoretically, it is possible that the controlled residential ventilation pushes more heat in during the day than it removes at night. it all depends on the temperature difference. if it is 35°C outside and 20°C inside, heat is pushed in with a 15K difference (high heat transfer). if it is then 25°C inside at night and 15°C outside, you would only get the heat out again with a 10°C difference.
practically, however, this is nonsense, because on the one hand, the heat absorption of the air is trivial anyway and on the other hand, the air on the intake side (very often the north/west side of the house) is in the cooler shade anyway.
in fact, you can do without the ventilation system in summer, but it doesn't hurt if it continues to run at a low level.

moisture in summer is such a topic. thanks to the high dew point, mold actually hardly ever occurs, except in cellars etc...
 

AOLNCM

2016-09-02 13:38:48
  • #5
Then you could also do without the ventilation system in winter, because the fresh air blown into the house is colder than the warmed-up air that leaves the house.
 

Grym

2016-09-02 14:27:04
  • #6
Payday, the difference in days is not 15K but 1-2K. Heat recovery works in both directions. At night there is a bypass, it is really 5-10K colder because [WRH] is bypassed.
 

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