Herricane CS
®
Series
A p p l i c a t i o n G u i d e
18
www.trioniaq.com
SECTION III HOW TO SELECT THE PROPER CS SERIES
We recommend a minimum of 6” downstream of an object for service and installation concerns. The only time 6” is insufficient
would be on a VAV system which combines manifolds in the air handler and a very high steam intensity - which is a rare
condition. The upstream clearance chart is shown for confirmation that the 6” number is adequate.
For example: We have a total of 30” to evaporate the steam at 60º, 80% RH and 1500 fpm. The chart shows we only need
between <1.5” and <3.0” at the velocities over 1000 fpm. The 6” recommended clearance is more than sufficient. Therefore,
our
net
available evaporation distance is 24”.
3. “Correction Factor” for Duct Temperature and Duct Relative Humidity
Duct temperature and downstream duct relative humidity have a profound effect on the evaporative distance of any humidifier.
Together with air velocity, which will be addressed in step 4, these are the factors that can make or break an otherwise good
application. All three must be addressed for a good application.
The correction factor will take the conditions present in the subject duct/air handler and translate those conditions to the
standard conditions of 55ºF @ 70%RH. The evaporation distances at standard conditions are detailed on the Steam Intensity
Chart on the next page. The correction factor will make the specific conditions in the duct/air handler equal to the standard
conditions of 55ºF @ 70%. For example, if the conditions in the duct are less conducive to evaporation, say 60ºF @80% RH,
we must use the “Correction Factor” Chart to determine the shorter evaporation distance than required at standard conditions.
Notice that the correction factor is 1.25 and we want the bulk of the steam evaporated in 24”. The corrected bulk evaporation
distance is:
Ec = 24” / 1.25 = 19.2” pr 1.6’
Correction Factor for Bulk and Last Wisp Evaporation Distances
Duct Temp,
º
F
30%
40%
50%
60%
70%
80%
90%
40
.75
.88
1.06
1.32
1.76
2.64
5.28
45
.62
.73
.87
1.09
1.45
2.18
4.35
50
.52
.60
.72
.90
1.20
1.80
3.61
55
.43
.50
.60
.75
1.00
1.50
3.00
60
.36
.42
.50
.63
.84
1.25
2.51
65
.30
.35
.42
.53
.70
1.05
2.10
70
.25
.30
.35
.44
.59
.88
1.77
75
.21
.25
.30
.37
.50
.75
1.49
80
.18
.21
.25
.32
.42
.63
1.27
85
.15
.18
.22
.27
.36
.54
1.08
90
.13
.15
.18
.23
.31
.46
.92
95
.11
.13
.16
.20
.26
.39
.79
100
.10
.11
.14
.17
.23
.34
.68
