52
Total Humidification Load Calculation
2596995_0_EN_1905
Nortec EL
°F
lb/ft
3
°F
lb/ft
3
°F
lb/ft
3
°F
lb/ft
3
°F
lb/ft
3
36
0.000353
56
0.000723
76
0.00139
96
0.00254
120
0.00491
37
0.000366
57
0.000747
77
0.00144
97
0.00262
125
0.00559
38
0.000380
58
0.000773
78
0.00149
98
0.00269
130
0.00634
39
0.000394
59
0.000800
79
0.00154
99
0.00277
135
0.00719
40
0.000409
60
0.000829
80
0.00158
100
0.00285
140
0.00812
Table 16: Moisture Content of Air at 100% RH (Metric Units)
°C
kg/m
3
°C
kg/m
3
°C
kg/m
3
°C
kg/m
3
°C
kg/m
3
-30
0.000578
-10
0.00218
10
0.00943
30
0.0303
50
0.0828
-29
0.000553
-9
0.00238
11
0.0100
31
0.0320
51
0.0867
-28
0.000540
-8
0.00259
12
0.0107
32
0.0337
52
0.0908
-27
0.000540
-7
0.00281
13
0.0114
33
0.0356
53
0.0951
-26
0.000551
-6
0.00305
14
0.0121
34
0.0375
54
0.0995
-25
0.000573
-5
0.00330
15
0.0129
35
0.0395
55
0.104
-24
0.000606
-4
0.00357
16
0.0137
36
0.0416
56
0.109
-23
0.000650
-3
0.00385
17
0.0145
37
0.0438
57
0.114
-22
0.000704
-2
0.00415
18
0.0154
38
0.0461
58
0.119
-21
0.000769
-1
0.00447
19
0.0163
39
0.0485
59
0.124
-20
0.000845
0
0.00481
20
0.0173
40
0.0510
60
0.130
-19
0.000931
1
0.00516
21
0.0183
41
0.0536
61
0.136
-18
0.00103
2
0.00554
22
0.0194
42
0.0563
62
0.142
-17
0.00113
3
0.00594
23
0.0206
43
0.0592
63
0.148
-16
0.00125
4
0.00636
24
0.0218
44
0.0621
64
0.154
-15
0.00138
5
0.00680
25
0.0230
45
0.0652
65
0.161
-14
0.00152
6
0.00727
26
0.0243
46
0.0685
66
0.168
-13
0.00167
7
0.00777
27
0.0257
47
0.0718
67
0.175
-12
0.00183
8
0.00829
28
0.0272
48
0.0753
68
0.182
-11
0.00200
9
0.00884
29
0.0287
49
0.0790
69
0.190
5.1.2 Moisture Content Equilibrium
Materials stored in conditioned environments may retain moisture content that is out of equilibrium with
the moisture content of that environment. Depending upon the hygroscopic properties of the material,
it may have an equalizing effect on the environment, thereby increasing (desorption) or decreasing
(absorption) the relative humidity (RH) of the surrounding environment. Any materials stored in the
conditioned environment that may release or absorb significant moisture from the atmosphere should
have their hygroscopic properties assessed by the manufacturer. Once the severity of this influence is
known, it should be incorporated into the total humidification load.
Hygroscopic regain is defined as the amount of water a completely dry material will absorb
from the air through desorption or absorption. Any hygroscopic product that is purchased
and sold by weight must be located in a carefully controlled environment.
