Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Search is the most efficient way to navigate the Engineering ToolBox!

Air - Humidifying with Steam - Imperial Units

Sponsored Links

The amount of steam needed to humidify 100 cfm(cubic feet per minute) of air is indicated below.

For full table - rotate the screen!

Air - Humidifying with Steam - Imperial Units
Vapor in 100 cfm air (lb/h)
Dry
Temperature
Humidity (%)
(oF)(oC) 100 85 80 75 70 65 60 55 50 45 40 35 30
90 32.2 12.8 10.9 10.3 9.6 9.0 8.3 7.7 7.1 6.4 5.8 5.1 4.5 3.9
88 31.1 12.1 10.3 9.7 9.1 8.5 7.9 7.3 6.6 6.1 5.4 4.8 4.2 3.6
86 30.0 11.4 9.7 9.1 8.5 8.0 7.4 6.9 6.3 5.7 5.1 4.6 4.0 3.4
85 29.4 11.0 9.4 8.8 8.3 7.7 7.2 6.6 6.1 5.5 5.0 4.4 3.9 3.3
84 28.9 10.7 9.1 8.5 8.0 7.5 7.0 6.4 5.9 5.3 4.8 4.3 3.7 3.2
83 28.3 10.4 8.8 8.3 7.8 7.3 6.7 6.2 5.7 5.2 4.7 4.2 3.6 3.1
82 27.8 10.1 8.6 8.0 7.6 7.1 6.5 6.1 5.5 5.0 4.5 4.0 3.5 3.0
81 27.2 9.8 8.3 7.8 7.3 6.8 6.4 5.9 5.4 4.9 4.4 3.9 3.4 2.9
80 26.7 9.5 8.0 7.6 7.1 6.7 6.2 5.7 5.2 4.7 4.3 3.8 3.3 2.8
79 26.1 9.2 7.8 7.3 6.9 6.4 6.0 5.5 5.1 4.6 4.1 3.7 3.2 2.7
78 25.6 8.9 7.6 7.1 6.7 6.2 5.8 5.3 4.9 4.4 4.0 3.6 3.1 2.7
77 25.0 8.6 7.3 6.9 6.5 6.1 5.6 5.2 4.7 4.3 3.9 3.5 3.0 2.6
76 24.4 8.4 7.1 6.7 6.3 5.9 5.5 5.0 4.6 4.2 3.8 3.4 2.9 2.5
75 23.9 8.1 6.9 6.5 6.1 5.7 5.3 4.9 4.5 4.1 3.6 3.2 2.8 2.4
74 23.3 7.9 6.7 6.3 5.9 5.5 5.1 4.7 4.3 3.9 3.5 3.1 2.7 2.4
73 22.8 7.6 6.5 6.1 5.7 5.3 4.9 4.6 4.1 3.8 3.4 3.1 2.7 2.3
72 22.2 7.4 6.3 5.9 5.5 5.2 4.8 4.4 4.1 3.7 3.3 2.9 2.6 2.2
71 21.7 7.1 6.1 5.7 5.3 5.0 4.6 4.3 3.9 3.6 3.2 2.9 2.5 2.1
70 21.1 6.9 5.9 5.5 5.4 4.8 4.5 4.1 3.8 3.5 3.1 2.8 2.4 2.1
69 20.6 6.7 5.7 5.4 5.0 4.7 4.4 4.0 3.7 3.4 3.0 2.7 2.4 2.0
68 20.0 6.5 5.5 5.2 4.9 4.5 4.2 3.9 3.5 3.2 2.9 2.6 2.3 1.9
67 19.4 6.2 5.3 5.0 4.7 4.4 4.1 3.7 3.4 3.1 2.8 2.5 2.2 1.9
66 18.9 6.1 5.2 4.9 4.5 4.2 3.9 3.6 3.3 3.0 2.7 2.4 2.1 1.8
65 18.3 5.9 5.0 4.7 4.4 4.1 3.8 3.5 3.2 2.9 2.6 2.3 2.1 1.8
60 15.6 5.0 4.2 4.0 3.7 3.5 3.2 3.0 2.7 2.5 2.2 2.0 1.7 1.5
55 12.8 4.2 3.6 3.4 3.1 2.9 2.7 2.5 2.3 2.1 1.9 1.7 1.5 1.3
50 10.0 3.5 3.0 2.8 2.6 2.5 2.3 2.11 1.9 1.8 1.6 1.4 1.2 1.1
45 7.2 2.9 2.5 2.4 2.2 2.1 1.9 1.8 1.6 1.5 1.3 1.2 1.0 0.89
40 4.4 2.5 2.1 2.0 1.8 1.7 1.6 1.5 1.3 1.2 1.1 1.0 0.86 0.74
30 -1.1 1.7 1.4 1.3 1.2 1.2 1.1 1.0 0.92 0.83 0.75 0.67 0.58 0.50
20 -6.7 1.1 0.91 0.85 0.80 0.75 0.70 0.64 0.59 0.53 0.48 0.43 0.37 0.32
10 -12.2 0.67 0.56 0.53 0.50 0.47 0.43 0.40 0.37 0.33 0.30 0.26 0.23 0.20
0 -17.8 0.41 0.35 0.32 0.31 0.29 0.26 0.25 0.22 0.20 0.19 0.16 0.13 0.12
-10 -23.3 0.25 0.21 0.2 0.19 0.17 0.16 0.15 0.14 0.12 0.11 0.10 0.08 0.08
-20 -28.9 0.14 0.12 0.11 0.11 0.10 0.10 0.08 0.08 0.72 0.06 0.05 0.05 0.04
  • 100 cfm = 0.047 m3/s = 170 m3/h
  • 1 lb/h = 0.4536 kg/h

Example - Humidifying Air with Steam

How much steam is needed to transform air at 30oF with 100% humidity to air at 70oF with 40% humidity?

  • air at 30oF and 100% humidity - steam content 1.67 lb/h (100 cfm/h air flow)
  • air at 70oF and 40% humidity - steam content 2.76 lb/h (100 cfm/h air flow)

The difference (2.76 - 1.67) = 1.09 lb/h is the amount of steam needed for 100 cfm/h air flow.

Note!

This table neglects the sensible heat required to heat cold air to final state. In the example above the heat required to heat 100 cfm dry air from 30oF to 70oF must be added. The heat can be added as dry heat with heating panels or similar, or in general more convenient by adding more steam.

Sponsored Links

Related Topics

Air Psychrometrics

Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.

Steam and Condensate

Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

Related Documents

Air - Absolute Humidity

Absolute humidity is the actual mass of water vapor present in the air water vapor mixture.

Air - Heating, Cooling, Mixing, Humidifying or Dehumidifying Processes

Basic air changing state processes - heating, cooling, mixing, humidifying and dehumidifying by adding steam or water - psychometric diagrams and the Mollier charts.

Air - Humidifying by Adding Steam or Water

Air can be humidified by adding water or steam.

Air - Humidifying with Steam, SI units

Using steam to humidify air.

Air - Humidity Ratio

The mass of water vapor present in moist air - to the mass of dry air.

Air - Moisture Holding Capacity vs. Temperature

The moisture holding capacity of air increases with temperature.

Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units

Psychrometric chart for air at barometric pressure 29.921 inches of Mercury and temperature ranging 20oF to 120oF.

Air and Steam Mixtures

Air in the steam will lower the surface temperatures in heat exchangers - and less heat will be transferred.

Humidifiers

Sprayed coils, spinning discs and steam humidifiers.

Moist Air - Density vs. Water Content and Temperature

Density of the mix of dry air and water vapor - moist humid air.

Steam Heating Air

Calculate steam heated air systems.

Steam Heating Processes - Load Calculating

Calculating the amount of steam in non-flow batch and continuous flow heating processes.

Vapor and Steam

An introduction to vapor and steam.

Sponsored Links

Search Engineering ToolBox

Search is the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics on the AMP pages. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.