40
VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
6.5 Adjustment of humidifier
To the humidifier the water flow should be adjusted. Water consumption must be adjusted for a
specific AHU, so that the pad will clearly wet on the entire surface.
Table 10 shows the minimum and nominal value of the water flow for standard work point:
- air inlet temperature 40°C
- relative humidity 15%
air velosity in the humidifier pad 2,5m/s
Table 11. Value of the water flow
AHU size
Min. water feed
Nom. water feed
VS
l/min
l/min
21
0,54
1,08
30
0,79
1,58
40
0,97
1,95
55
1,49
2,98
75
1,68
3,37
100
2,24
4,47
120
2,71
5,42
150
3,31
6,61
180
4,16
8,32
230
5,03
10,05
300
6,79
13,58
400
9,64
19,28
500
11,27
22,54
650
15,26
30,53
Increasing the air flow results in a linear increase of water consumption. On the water consumption
also affected
by temperature and humidity of the air entering the humidifier (Table 12).
Table 12. Influence of temperature and humidity on the water consumption.
T°C \
rH
0%
10%
20%
30%
40%
50%
15
0,64
0,58
0,51
0,44
0,38
0,3
20
0,74
0,68
0,6
0,51
0,44
0,35
25
0,84
0,78
0,68
0,59
0,5
0,4
30
0,95
0,88
0,77
0,66
0,57
0,46
35
1,06
0,98
0,85
0,73
0,63
0,51
40
1,18
1,08
0,94
0,81
0,69
0,56
45
1,29
1,18
1,02
0,88
0,75
0,61
50
1,4
1,28
1,11
0,95
0,82
0,67
55
1,53
1,38
1,19
1,03
0,88
0,72
60
1,65
1,48
1,28
1,1
0,94
0,77
For example: the inlet air temperature of 30°C and humidity of 20% rH, the humidification efficiency
and water consumption amount take the 0.77 of the values specified in Table 10.
7. OPERATION AND MAINTENANCE
Personnel in charge of AHU operation should read through this documentation before
starting any operation and maintenance activities. When no such personnel with
appropriate skills and competence is available, periodic inspections should be carried
out by the authorized VTS service providers.
