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Humidifying Air with Steam - SI units

Use steam to humidify air

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The amount of vapor in 100 m3 air volume is indicated below.

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Vapor in Air (kg per 100 m3air)
Dry Bulb Temperature (oC)Relative Humidity (%)
100 85 80 75 70 65 60 55 50 45 40 35 30
32 3.39 2.89 2.72 2.55 2.38 2.19 2.04 1.93 1.7 1.53 1.36 1.19 1.02
31 3.22 2.73 2.57 2.41 2.25 2.1 1.93 1.77 1.61 1.45 1.29 1.13 0.97
30 3.05 2.59 2.44 2.29 2.13 1.97 1.83 1.67 1.52 1.37 1.22 1.07 0.91
29 2.89 2.45 2.31 2.17 2.02 1.88 1.73 1.59 1.45 1.3 1.16 1.01 0.87
28 2.73 2.32 2.19 2.05 1.91 1.78 1.64 1.5 1.37 1.23 1.1 0.96 0.82
27 2.59 2.2 2.07 1.94 1.81 1.68 1.55 1.42 1.29 1.16 1.03 0.91 0.78
26 2.45 2.08 1.96 1.83 1.71 1.59 1.47 1.34 1.22 1.1 0.97 0.86 0.73
25 2.31 1.97 1.85 1.73 1.62 1.5 1.39 1.27 1.16 1.04 0.93 0.81 0.69
24 2.19 1.86 1.75 1.64 1.53 1.42 1.31 1.2 1.09 0.98 0.87 0.77 0.66
23 2.06 1.76 1.63 1.55 1.45 1.34 1.24 1.14 1.03 0.93 0.83 0.72 0.62
22 1.95 1.66 1.56 1.46 1.36 1.27 1.17 1.07 0.98 0.88 0.78 0.68 0.59
21 1.84 1.56 1.47 1.38 1.29 1.2 1.1 1.02 0.92 0.83 0.74 0.67 0.55
20 1.74 1.48 1.39 1.3 1.22 1.13 1.04 0.98 0.87 0.78 0.69 0.61 0.52
19 1.63 1.39 1.31 1.23 1.15 1.06 0.98 0.9 0.82 0.74 0.65 0.57 0.49
18 1.54 1.31 1.24 1.16 1.08 1 0.93 0.85 0.77 0.69 0.62 0.54 0.46
17 1.45 1.24 1.16 1.09 1.02 0.94 0.87 0.8 0.73 0.65 0.59 0.51 0.44
15 1.29 1.1 1.03 0.97 0.9 0.84 0.77 0.71 0.66 0.58 0.52 0.45 0.39
10 0.94 0.8 0.76 0.71 0.66 0.61 0.57 0.52 0.47 0.43 0.38 0.33 0.28
0 0.49 0.41 0.39 0.37 0.34 0.32 0.29 0.27 0.24 0.22 0.2 0.17 0.15
-5 0.33 0.28 0.26 0.25 0.23 0.21 0.2 0.18 0.16 0.15 0.13 0.11 0.1
-10 0.22 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.06

Note! In a psychrometric chart or in a Mollier diagram the amount of vapor humidity ratio - x - is indicated in kg/kgdry air (kg vapor per kg dry air).  The values above can be transformed to kg/kgdry air by dividing the values with the air density at the actual temperature.

Example - Humidifying Air with Steam

Air at 20oC and 30% relative humidity are humidified to 20oC and 80% relative humidity.

From the table above it can be estimated that air at 20oC and 30% relative humidity contains 0.52 kg water vapor per 100 m3 air volume. Air at 20oC and 80% relative humidity contains 1.39 kg per 100 m3 air volume.

The amount of water vapor required per 100 m3 air volume can be calculated like

Amount of Water Vapor = (1.39 kg/100 m3 air volume) - (0.52 kg/100 m3 air volume)

= 0.87 (kg/100 m3 air volume)

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