Moist Air - the Mollier Diagram
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.
- 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:
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.
• Air Psychrometrics
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
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.
Air Drying Force
The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity.
Cooling and Heating Equations
Latent and sensible cooling and heating equations - imperial units.
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.