James Fischer <[log in to unmask]> a écrit :
>
> Offhand, I'd guess that "water vapor effects" really
> only matter in
> beehives that are overwintered in locations were
> bees would not survive
> without things like hive-wrapping, places where the
> air temperature is
> so low that the air warmed by the bees is cooled to
> the ambient
> temperature before it gets anywhere near the top of
> the hive.
>

Glad you are posting on the list again after a break.

There is not doubt hot (and humid) air will rise up in
the hive as far as there is a top ventilation.

The question is where will condensation happen,
depending on hive insulation setting. And here come,
two other simple thermodynamic considerations :
"l'effet de paroi" (what I would litterally translate
into "inner wall effect", I do not know exact english
vocabulary for this) and dew point directly linked to
the himidity in the air, air temperature, ventilation
flow, outside temperature and humidity and inner
surfaces temperature (so we are back to insulation and
R value). The aim is to know if droplets will appear
on surfaces, and how they will flow down (on bees,
along side wall...).

Hervé
Québec - Canada


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