HUMIDIFIER, FOR CIRCULATED WATER
Installation and maintenance instruction
8
FläktGroup
DC_8642GB 20180131_R0
Specifications are subject to alteration without notice
WATER BLEED-OFF
Water consumption consists of the useful evaporation and
essential water bleed-off flow. This bleed-off flow is necessary
to reduce the concentration of salts in the circulating water.
If the salt concentration becomes too high, salts are precipitated
out in the humidifier fills, which will reduce the performance and
working life of the humidifier.
Chart 1 can be used to determine the appropriate bleed-off flow,
by determining zone for the current water quality. Then set the
appropriate bleed-off flow to ensure that the water in the tray is
kept clean it is recommended that it is drained and flushed once
every 24 hours (timing is preset at factory for 12.00–12.15).
If high demands are made on hygiene or if humidification require-
ments are high for an extended period, i.e.
Δ
x > 8 gram per kg
of air (90 % humidifier) or
Δ
x > 5 gram (60 % humidifier), it is re-
commended that an extra drainage and flushing cycle is added
in each 24-hour period. It may be necessary to extend the dilu-
tion time, see table 4. The value (T) is set using the display.
Size
Time for dilution, seconds
Normal operation,
preset value
High humidification over
a long period
b = 1
90 %
b = 2
80 %
Δ
x >8 gram
90 %
Δ
x >8 gram
80 %
009
011
014
018
020
0
10
10
20
10
0
0
0
0
0
0
20
20
30
20
0
0
0
10
0
023
027
20
10
0
0
40
20
10
0
032
041
047
20
30
40
0
0
0
40
60
80
10
20
30
036
30
0
90
20
045
050
054
072
30
50
50
60
0
0
0
0
80
100
100
120
20
30
30
40
056
063
068
40
50
70
0
0
0
80
100
120
30
30
50
079
190
55
60
0
0
55
60
20
20
Table 5. Presetting the dilution period
AHU
eQ
009
eQ
011
eQ
014
eQ
018
eQ
020
eQ
023
eQ
027
eQ
032
eQ
036
eQ
050
eQ
072
eQ
090
Airflow
m
3
/s
0,8
1
1,5
1,7
2
2,5
3
4
4
5
7
9
Water content of entering air
g/kg
5
5
5
5
5
5
5
5
5
5
5
5
Water content of leaving air
g/kg
10
10
10
10
10
10
10
10
10
10
10
10
Tankvolume, level A
l
30,8 50,4
45,5 60,3 45,5
75,2
60,3
80,1
85,6
148,4 169,3 169,3
Tankvolume, level B
l
15,3
25,1
22,6
30
22,6
37,5
30
39,9
47,8
82,8
94,4
86,9
Tankvolume, level C
l
10,3
16,9
15,2
20,2
15,2
25,2 20,2 26,9
26,6
46
52,5
52,5
Dilution time, T
sek
0
10
10
20
10
20
10
20
30
50
60
60
Operation time/day
(average over the year)
tim
3,6
3,6
3,6
3,6
3,6
3,6
3,6
3,6
3,6
3,6
3,6
3,6
Draining per day
1
1
1
1
1
1
1
1
1
1
1
1
Water cost
€/m
3
2
2
2
2
2
2
2
2
2
2
2
2
Calculated water consumption:
Water consumption due to
evaporation
l/h
17,3
21,6
32,4
36,7
43,2
54,0
64,8
86,4
86,4
108,0 151,2
194,4
Water consumption due to
draining to level C
l/h
5,6
7,0
10,5
11,9
14,0
17,6
21,0
27,9
48,5
60,6
84,6
81,2
Water consumption due to
dilution calc on T
l/h
0,0
4,3
7,1
12,1
9,4
14,3
10,7
21,5
34,3
41,2
60,6
70,8
Water consumption due to rinsing
l/h
8,6
14,0
12,6
16,8
12,6
20,9
16,8
22,3
23,8
41,2
47,0
47,0
Total water consumption
l/h
31,4
46,9 62,6 77,5
79,2 106,8 113,2 158,1 192,9 251,0 343,4 393,4
Total water consumption
m
3
/år
41,3
61,6 82,2 101,8 104,1 140,4 148,7 207,7 253,5 329,8 451,2 516,9
Water cost/year
€/år
83
123
164
204
208
281
297
415
507
660
902
1034
Factor total consump/evaporation
1,82
2,17
1,93
2,11
1,83
1,98
1,75
1,83
2,23
2,32
2,27
2,02
WATER CONSUMPTION FOR HUMIDIFIER WITH CIRCULATING WATER
CIRCULATION FLOW
Dry air
Humid air
Table 4. The water consumption per years is dependant on climate, operation hours, water quality and the quantity of moisture required.
this table gives an estimate for a typical case.
