DanVex DEH-1700P, Operation Manual

Page: 4 / 23

R
www.danvex.fi
AIR DEHUMIDIFICATION
The moisture from the basin surface (evaporation) is absorbed by the ambient air. Thus, this
increases the air humidity and ultimately results in corrosion, mould, rot, peeling of paint coat-
ings and other unwanted damages.
The below diagram shows an example of metal corrosion rate at different air humidity levels.
3
As you can see the rate of corrosion is insignificant at the relative humidity (RH) below 50%,
and it can be disregarded at RH below 40%. But at the relative humidity above 60% the rate
of corrosion increases considerably. This moisture damage example applies also to many
other materials, such as powders, packaging, wood, electric equipment or electronic devices.
There are two different ways of buildings drying out:
1. By heating with further air exchange:
The ambient air is heated to absorb the moisture and then it is discharged to the atmosphere.
However the total energy output is lost during the moist air discharging to the atmosphere.
0 20 40 60 80 100
30
60
90
120
0
Air relative humidity, %
Corrosion time