No condensation on the casing

Even with everyday room-air requirements, commercially available air handling units may be subject to condensation under extreme weather conditions. These extreme weather conditions, with higher temperatures and air humidity levels, are encountered more and more frequently even in temperate climate zones. Condensation will then occur on the casings of AHUs with poor insulation classes and thermal-bridge factors.
This concerns all AHUs which are exposed to cool air. The greater the difference between the temperature in the installation space and the temperature of the air being handled, the higher the risk of condensation. In winter, the outdoor-air chambers of indoor AHUs, in summer the sections downstream of the coolers of outdoor units are particularly at risk.

The risks involved in condensation on the surface include:

  • insufficient hygiene due to micro-organisms proliferating the humid environment
  • corrosion and premature ageing due to an increased concentration of corrosive media in the condensate
  • structural damage caused by condensation water penetrating the building structure

The standard DIN EN 1886 describes five classes for distinguishing the thermal bridges of AHUs. A casing’s tendency of condensation rises significantly from class TB1 to class TB5. Condensation on the casing surface will thus occur considerably earlier with poor TB classes.
The new RM/RL-Line by robatherm is in the best class, TB1. Even robatherm’s sight glasses are of best TB1 quality.