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.
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.
Download and print Mollier diagram
- common psychrometrics terms
The Mollier diagram is a variant of the psychrometric chart.
- Transform between Mollier diagram and 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:
From 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:
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.
Related Topics
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Air Psychrometrics
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
Related Documents
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Air - Drying Force
The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity. -
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 Measurement from Dry and Wet Bulb Temperature
Relative humidity in moist air can estimated by measuring the dry and wet bulb 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. -
Cooling and Heating Equations
Latent and sensible cooling and heating equations - imperial units. -
Dehumidifiers
Classification of dehumidifiers. -
Evaporation from a Water Surface
Evaporation of water from a water surface - like a swimming pool or an open tank - depends on water temperature, air temperature, air humidity and air velocity above the water surface - online calculator. -
Heat Recovery Efficiency
Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator. -
Mixing of Humid Air
The change in state wwhen mixing moist air - enthalpy, heat, temperature and specific humidity. -
Moist Air - Cooling and Dehumidifying
Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling. -
Moist Air - Psychrometric Terms
Dry and wet bulb temperature, specific volume, relative humidity, enthalpy and more. -
Moist Air - Transforming the Mollier Diagram to a Psychrometric Chart - or vice versa
The relationship between the psycrometric chart and the Mollier diagram. -
Relative Humidity in Production and Process Environments
Recommended relative humidity in production and process environments - like libraries, breweries, storages and more.
