Table 6. Regain Of Hygroscopic Materials - Nortec NHPC Engineer's Manual

Table 5. Inside Relative Humidities At Which Moisture Will Condense On Windows (cont)
Outside
Inside Temperature (°F/°C)
Temperature
60/
°F °C
15.5
Double Windows, Still Air
-50 -45 34
-40 -40 38
-30 -34 42
-20 -29 47
-10 -23 52
0 -18 57
10 -12 62
20 -7 69
30 -1 76
40 4 84
NOTE: Bold areas indicate that moisture will be in the form of frost on windows.
Industry
Baking Crackers
Flour
White Bread
Leather Sole Oak, Tanned
Printing Paper – Comm. Ledger – 75% Rag
1% Ash
Paper M.F. Newsprint – 24% Ash
Paper White Bond Rag – 1% Ash
Paper Writing – 3% Ash
Textile Cotton – Absorbent
Cotton – American-cloth
Cotton – Sea Isle-roving
Hemp – Manila and Sisal
Jute – Average Grade
Linen – Dried Spun – Yarn
Rayon – Celulose – Acetate – Fibre
Rayon – Cupramonium – Average
Skein
Rayon – Viscose Nitrocel
Silk – Raw Chevennes-Skein
Wool – Australian-Marino-Skein
Tobacco Cigarette
Wood Timber – Average
Glue – Hide
Miscellaneous Charcoal-Steam Activated
Gelatin
Silica Gel
Soap
Starch
NOTE: Moisture content expressed in per cent of dry weight of the substance at various relative humidities –
Temperature 75°F.
10-10
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2008-10-01
65/ 70/ 75/ 80/
18.3 21 23.8 26.6
34 34 33 32
38 36 36 35
42 41 40 38
46 46 44 42
50 49 48 46
55 55 52 50
60 59 57 54
66 63 62 59
73 71 68 65
80 79 74 71

Table 6. Regain of Hygroscopic Materials

Materials
Outside
Inside Temperature (°F/°C)
Temperature
60/
°F °C
15.5
Double Windows, Wind
-50 -45 23
-40 -40 32
-30 -34 36
-20 -29 41
-10 -23 46
0 -18 52
10 -12 58
20 -7 65
30 -1 72
40 4 80
Relative Humidity - %
10 20 30 40
2.1 2.8 3.3 3.9
2.6 4.1 5.3 6.5
0.5 1.7 3.1 4.5
5.0 8.5 11.2 13.6
3.2 4.2 5.0 5.6
2.1 3.2 4.0 4.7
2.4 3.7 4.7 5.5
3.0 4.2 5.2 6.2
4.8 9.0 12.5 15.7
2.6 3.7 4.4 5.2
2.5 3.7 4.6 5.6
2.7 4.7 6.0 7.2
3.1 5.2 6.9 8.5
3.6 5.4 6.5 7.3
0.8 1.1 1.4 1.9
4.0 5.7 6.8 7.9
4.0 5.7 6.8 7.9
3.2 5.5 6.9 8.0
4.7 7.0 8.9 10.8
5.4 8.6 11.0 13.3
3.0 4.4 5.9 7.6
3.4 4.8 5.8 6.6
7.1 14.3 22.8 26.2
0.7 1.6 2.8 3.8
5.7 9.8 12.7 15.2
1.9 3.8 5.7 7.6
2.2 3.8 5.2 6.4
65/ 70/ 75/
18.3 21 23.8 26.6
26 26 26
30 30 29
34 34 32
39 38 35
45 42 42
49 47 46
56 53 52
63 59 58
70 66 64
78 73 70
50 60 70 80
5.0 6.5 8.3 10.9
8.0 9.9 12.4 15.4
6.2 8.5 11.1 14.5
16.0 18.3 20.6 24.0
6.2 6.9 8.1 10.3
6.1 7.2 8.7 10.6
6.5 7.5 8.8 10.8
7.2 8.3 9.9 11.9
18.5 20.8 22.8 24.3
5.9 6.8 8.1 10.0
6.6 7.9 9.5 11.5
8.5 9.9 11.6 13.6
10.2 12.2 14.4 17.1
8.1 8.9 9.8 11.2
2.4 3.0 3.6 4.3
9.2 10.8 12.4 14.2
9.2 10.8 12.4 14.2
8.9 10.2 11.9 14.3
12.8 14.9 17.2 19.9
16.0 19.5 25.0 33.5
9.3 11.3 14.0 17.5
7.6 9.0 10.7 11.8
28.3 29.2 30.0 31.1
4.9 6.1 7.6 9.3
17.2 18.6 20.2 21.5
10.0 12.9 16.1 19.8
7.4 8.3 9.2 10.6
80/
25
28
31
35
39
44
49
54
60
67
90
14.9
19.1
19.0
29.2
13.9
13.2
14.2
25.8
14.3
14.1
15.7
20.2
13.8
5.3
10.0
16.0
18.8
23.4
50.0
22.0
12.5
32.7
11.4
22.6
23.8
12.7