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Maximum water content in humid air vs. temperature.
The maximum moisture content possible in air - at saturation - varies with temperature. The table below indicates maximum moisture content in a cubic metre of air at various temperatures:
Air - Maximum Moisture Carrying Capacity
|(oC)||(oF)||(10-3 kg/m3)||(10-3 lb/ft3)|
|-25 ||-13 ||0.64 ||0.040 |
|-20 ||-4 ||1.05 ||0.066 |
|-15 ||5 ||1.58 ||0.099 |
|-10 ||14 ||2.31 ||0.14 |
|-5 ||23 ||3.37 ||0.21 |
|0 ||32 ||4.89 ||0.31 |
|5 ||41 ||6.82 ||0.43 |
|10 ||50 ||9.39 ||0.59 |
|15 ||59 ||12.8 ||0.8 |
|20 ||68 ||17.3 ||1.07 |
|30 ||86 ||30.4 ||1.9 |
|40 ||104 ||51.1 ||3.2 |
|50 ||122 ||83.0 ||5.2 |
|60 ||140 ||130 ||8.1 |
Example - Moisture Carrying Capacity in Heated Air
Air is heated from 20oC to 50oC.
- from the table above the maximum moisture content in air at 20oC is 17.3 g/m3, and
- the maximum moisture content in air with temperature 50oC is 83 g/m3
The increased ability to carry moisture can be calculated as
100 % ((83 g/m3) - (17.3 g/m3)) / (17.3 g/m3)
= 380 %
This dramatic change is important to explain why heated air is so much more effective than cold air in drying processes.
- Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
- The mass of water vapor present in moist air - to the mass of dry air.
- The moisture holding capacity of air increases with temperature.
- Saturation pressure and maximum water content in compressed air.
- Dehumidifying by cooling, adsorption or absorption.
- Dry Bulb, Wet Bulb and Dew Point temperatures can be used to determine the state of humid air.
- Enthalpy change and temperature rise when heating humid air without adding moisture.
- Pressure, temperature and volume in a perfect ideal gas like moist air (air with water vapor).
- Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling.
- The pressure in a mixture of dry air and water vapor - humid or moist air - can be estimated by using Daltons Law of partial pressures.
- Humidity ratio of moist air to humidity ratio of saturated moist air.
- Density of the mix of dry air and water vapor - moist humid air.
- Sensible and latent heat of moist air.
- Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy.
- Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.
- Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air
- Saturation pressure of water vapor in moist air vs. temperature.
- Air flow required to remove vapor production from a room.
- Weight of green and air-dried fire wood.
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