Ventilation of the tree cave
A natural change of air in the tree cave only takes place to a limited extent. The flight hole is usually in the lower third of the tree cave. With a diameter of a few centimeters and a tunnel length of approx. 10 cm, no significant air exchange rates are likely to occur. This is negligible for the decrease in moisture.
You find the average geometric data of tree caves that are naturally inhabited by bees in “The nest of the honeybee” (downloads).
Ventilation of bee hives
As already shown under water vapor diffusion, the moisture produced in modern hives is not removed by diffusion. The buffering effect does not affect the climate in the modern bee hive either, the mass of the wood is too small.
Due to the low thermal insulation condensation already occurs in honeycomb construction. A supposedly sensible solution to the problem is increased ventilation in the form of an open floor or even through the application of cross-ventilation.
This basically working dehumidification takes place at a very high level. Condensation water can be largely prevented, but the relative humidity in the bee hive remains very high. The slight improvement in terms of condensation water accumulation is bought at a high price, via heavy energy losses. Large parts of the honeycomb construction and the hive construction lose their insulating effect for the bee grape due to the ventilation.