Condensation of water vapor on insulating glass units is a physical phenomenon that often causes a lot of problems and misunderstandings from the manufacturer to the end user. At this point we need to answer a basic question: When does the so-called “dew” appear on the glass? Where does condensate come from?
People wearing glasses who enter warm rooms from the cold know perfectly well the problem of the appearance of deposits: If a cold surface is placed in a space with humid air, condensation will form on it – regardless of whether it is glasses or a bottle of beer taken out of the fridge – physics says so Will this always work? There is moisture in the air. The higher the air temperature, the more water it is able to bind in the form of water vapor – and vice versa – the lower it is, the less water it is able to absorb.
The humidity content in the air is given as relative air humidity in percent, with the maximum filling being 100%. If the warm air with a constant water vapor content is now cooled – e.g. by contact with a cold beer bottle – the relative humidity of this air increases. At a humidity of 100%, the so-called maximum is reached. dew point: excess water vapor in the air begins to condense, forming dew drops on the glass surface. The temperature at which this occurs is called the dew point temperature.
This theoretical temperature value depends on the original humidity content in the air and the initial temperature of the air itself. The colder the surface or the higher the humidity, the greater the effect of condensation, or the amount of condensate.
Places where condensation may appear:
a) on the glass surface from the room side 4
b) in the edge part of the glass on the side of room 4
c) on the surface of the glass from the outside 1
d) inside the insulating glass 2, 3
It is not possible to completely eliminate this phenomenon because the outer glass is exposed to changing weather conditions. To sum up, the condensation effect in no way indicates a defect, but rather confirms the high quality of the insulating glass. Condensation of water vapor on the outer surface of the glass, but on the inside of the room, most often occurs in rooms with high humidity and insufficient
