Basics and Some Theory of AnTherm
Once the base solutions describing a particular model have been established,
temperature (boundary) conditions can be applied in the adjacent environments in
order to predict a specific temperature distribution in the building component.
|condensing humidity /
|Here the temperature along the component surface - where
condensation is most likely to occur - is of particular interest. Humidity
exceeding the saturation level of an environment, i.e. the condensing humidity
or dew point) [%], leads to condensation. This value is directly linked to the temperature at any given location under.
||Therefore surface points at which a temperature minimum can
be expected to occur must be localised in the model and explicitly evaluated
with respect to specified conditions:
- boundary conditions - air temperatures [°C]
- position of coldest surface point (x, y, and z coordinates)
- temperature of the surface at this point [°C]
- associated condensing humidity (the dew point) [%]
Note: Temperature maxima, i.e. warmest surface points, are primarily of
interest when assessing the factor of thermal comfort in constructions
which include heat sources. For example, situations in which electrical
heating could be implemented (as floor heating, or as a measure against
condensation) may be evaluated comparatively to determine if the power
output needed could lead to uncomfortably high surface temperatures.
Building elements which absorb and re-emanate solar gain can also be
effectively approximated as heat sources and thus evaluated in order to
assess constructions critically affected by solar radiation.
|Besides the avoidance of harmful water vapour
condensation the mould growth or corrosion are also of importance.
The mould growth can hold at 80% RH already.
Corroding events can start even at 60% RH.