The improvement in thermal insulation of building envelopes minimizes the problem of water
vapor condensation on their internal surfaces. However, the probability of water vapor condensation
on the external surfaces increases. This may take place under radiative cooling conditions
when the temperature on these surfaces drops below the air temperature. The aim of
this article is to analyze the influence of different factors on the possibility of external condensation.
Relevant computational examples and practical insights based on real-life observations
are shown. It was found that the basic factors contributing to the condensation of water
vapor on the external surfaces are the horizontal or oblique placing of the envelopes, no wind,
cloud-less sky and low thermal transmittance of the envelopes. The described phenomenon
can be mitigated by covering the surfaces with a low-emission coating.
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