Condair Esco

4.2 Installation instructions
40°
30°
t [°C]
20°
10°
0°
10 %
X 1
20 %
20
X
40
30 %
40 %
X 2
60
80
X s
0 5 10 15 20 25 30
X [g/kg]
50 %
h [kJ/ kg]
60 %
70 %
80 %
90 %
100 %
On the theory of humidification
4.3 Using the humidification distance diagrams
The air’s ability to absorb water vapour is dependent upon the prevailing
conditions of the air. It can be determined from the h-x diagram as the difference
between the saturated condition x S and the water vapour content
x 1 before humidification. Standard practice in air conditioning is to
always maintain a certain safety margin between the air condition x 2,
after humidification, and the saturated condition x S (=100% relative
humidity), to avoid the risk of condensation in the ducts. This danger
is reinforced further by the following factors:
• Supply-air temperature fluctuations prior to humidification, because
with lowering temperature, the state of saturation x S may drop below
the computed value for the state of saturation x 2 (humidification based
on humidifier performance),
• Humidity control system is not consistently adjusting to less than full
capacity requirements during transitional periods.
• Restricting factors (e.g. contaminated air filters) may greatly reduce
the operating air volume.
• When air ducts pass through cooler rooms, not x S at room temperature
is relevant, but rather at the duct’s inner wall temperature, which
might drop below the dew point.
These obvious physical relationships in air conditioning technology express
why condensation may occur in air ducts. Air will always absorb humidity,
offered in the form of water vapour, but not beyond the limit set by
the saturated condition.
Please pay close attention to the following diagrams, and strictly observe
the distances to downstream obstacles, when using the steam humidification
system Condair Esco. This way only, can you be assured, that the steam is
absorbed by the air and no formation of condensate on individual system
components takes place.
However, the exact calculation of the guaranteed humidification distance,
for the steam distribution system DR 73, is only possible by means
of the computer dimensioning software.
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