Remko AMT 30 User Manual download pdf (Page 4)

Air Dehumidification

The processes that take place during air dehumidifica-

tion are based on physical laws. We will try to describe

these in a simplified form to give you a rough idea about

the principle of air dehumidification.

There are two different ways of drying the buildings:

1. By heating and exchanging the air:

The ambient air is heated to absorb humidity and to

be carried off to the outside. However, the total gen-

erated energy is lost with the carried off humid air.

2. By dehumidifying:

The humid air in the closed room is continuously de-

humidified according to the condensation principle.

Dehumidification has a decisive advantage regarding

energy consumption:

Energy is exclusively needed for the existing room vol-

ume. The mechanical heat released during the dehu-

midification process increases the room temperature

slightly.

When used correctly the air dehumidifier consumes

only approx. 25 % of the energy to be supplied accord-

ing to the “heating and ventilation” principle.

As you can see the corrosion speed is insignificant at a

relative air humidity of less than 50 % and at a humidity

rate of less than 40 % it can even be neglected. When

the relative humidity exceeds 60 % corrosion speed in-

creases considerably.

This limit regarding damages caused by humidity is also

applicable to many other materials, such as powdery

substances, packing materials, wood, and electronic

apparatuses.

Relative Air Humidity

Ambient air is a gas mixture and it always contains a

certain rate of water in the form of water vapour.

This percentage of water is indicated in g per kg of dry

air (absolute water content).

1 m³ of air weighs approx. 1.2 kg at 20° C.

Depending on the temperature each kg of air can only

absorb a defined quantity of water vapour. When this

quantity has been absorbed, the air is “saturated” and

has a relative humidity of 100 %.

By relative air humidity we understand the relation be-

tween the percentage of water vapour contained in the

air at the moment concerned and the maximum possi-

ble percentage of the water vapour, based on equal

temperatures.

The capacity of air to absorb water vapour increases

with raising temperatures. This means that the maxi-

mum possible (= absolute) water content is increased

with increasing temperatures.

The Use of REMKO Air Dehumidifiers

◊ No matter how well doors and windows are insu-

lated, wetness and humidity penetrate even through

thick concrete walls.

◊ The water quantities required for binding regarding

the production of concrete, mortar, plaster, etc. need

in some cases 1 or 2 months to diffuse.

◊ And even the humidity that penetrates into the brick-

work after floods and inundations is released very

slowly.

◊ E.g. this is also the case regarding humidity con-

tained in stocked materials.

The humidity that emanates from parts of buildings or

materials (water vapour) is absorbed by the ambient air.

Consequently the humidity content of the air increases

which results in corrosion and in the formation of mil-

dew, decay, flaked off paint coats and other undesired

damage caused by humidity.

E.g. the following diagram shows in an exemplary way

the corrosion speed of metal at different air humidity

rates.

Temp. °C

Water vapour content in g/m³ at an air humidity of

40% 60% 80% 100%

-5 1,3 1,9 2,6 3,3

+10 3,8 5,6 7,5 9,4

+15 5,1 7,7 10,2 12,8

+20 6,9 10,4 13,8 17,3

+25 9,2 13,8 18,4 23,0

+30 12,9 18,2 24,3 30,3

1 2 3 4 5 6 7 8 9 ... 15 16

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Remko AMT 30 User Manual Page 4

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