Environmental Engineering Reference
In-Depth Information
15
5
measured after humidifier
calculated after humidifier
14
4
13
3
12
11
2
exhaust air humidity
10
1
9
8
0
23
24
25
26
27
28
Date in July
Figure 5.25
Measured and calculated absolute humidities of the exhaust air with 85% humidification
efficiency
Each component has specific time delays between the control signal (release) and
showing the effect in operation. The humidifiers, for example, need about 5-10minutes
after release to reduce the air temperature at the outlet significantly and the cooling
effect does not stop until 45 minutes after the release is switched off (see Figure 5.26).
So if the control signals are used for the evaluation of the humidifiers, in each period of
operation, about 40 minutes of real cooling operation is not considered. In the detailed
analysis of one month's performance (July), the different energy performance based
on the control signal evaluation and the real evaporative cooling were compared.
26
24
22
20
18
16
14
12
10
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
0
Time on 10 July / h
Temperature before humidifier
Temperature after humidifier
SAIA control signal
Real humidifier operation
Figure 5.26
Time delay between the control signal and reaction of the humidifier together with the
signal representing real operation of the humidifier, when the temperature difference is at least 3 K
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