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Moist Air - the Mollier Diagram

The Mollier diagram is a graphic representation of the relationship between air temperature, moisture content and enthalpy - and is a basic design tool for building engineers and designers.

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Air is a mixture of mostly oxygen, nitrogen and water vapor. The Mollier diagram is a graphic representation of the relationship between air temperature, moisture content and enthalpy, and is a basic design tool for building engineers and designers.

Mollier diagram Download and print Mollier diagram

The Mollier diagram is a variant of the psychrometric chart .

Example - How to use the Mollier Chart

The state of air with dry bulb temperature 21 o C and relative humidity 50% is indicated in the Moliier chart below:

Example use Mollier chart From the Mollier chart the enthalpy of the moist air is approximately 40 kJ/kg . The wet bulb temperature is approximately 14.5 o C . The specific humidity is approximately 0.0076 kg/kg .

Alternatively - if the dry bulb temperature is 19 o C and the wet bulb temperature is 12 o C - the state of the air can be visualized in the Mollier chart like:

Example use of Mollier chart wet temperature dry temperature

From the chart we can see that the enthalpy of the air is approximately 33 kJ/kg and the specific humidity is approximately 0.0056 kg/kg .

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Related Topics

  • Air Psychrometrics

    Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

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