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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

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 oC and relative humidity 50% is indicated in the Moliier chart below:

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

Alternatively - if the dry bulb temperature is 19 oC and the wet bulb temperature is 12 oC - 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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  • Engineering ToolBox, (2003). Mollier Diagram. [online] Available at: https://www.engineeringtoolbox.com/psychrometric-chart-mollier-d_27.html [Accessed Day Mo. Year].

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