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Air - Moisture Holding Capacity vs. Temperature

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The moisture holding capacity of air increases dramatically with increased temperature as indicated in the diagrams below.

Air Moisture Holding Capacity - SI Units

Moisture holding capacity of air - kg water per kg dry air:

Air Moisture Holding Capacity - Imperial Units

Moisture holding capacity of air - lb water per lb dry air:

Moisture holding capacity of air - lb water per 1000 cubic feet dry air:

Note - the moisture holding capacity of air at 100oF (38 oC) is 10 times the moisture holding capacity of air at 30oF (~ 0 oC). This is a very important observation - especially when working with drying processes where air is used to transport moisture away from process and products.

In general

  • it is in general good energy economy to increase the air temperature in a dryer as much as possible! - the increased moisture transport capacity of air at higher temperature out-weights the increased energy-consumption for heating the dry air to higher temperature!
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Related Topics

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

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Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.

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Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures.

Air - Density, Specific Weight and Thermal Expansion Coefficient vs. Temperature and Pressure

Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 °C (-140 to 2900 °F) at atmospheric and higher pressure - Imperial and SI Units.

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Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 °C.

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The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity.

Air - Dynamic and Kinematic Viscosity

Online calculator, figures and tables with dynamic (absolute) and kinematic viscosity for air at temperatures ranging -100 to 1600°C (-150 to 2900°F) and at pressures ranging 1 to 10 000 bara (14.5 - 145000 psia) - SI and Imperial Units.

Air - Humidifying by Adding Steam or Water

Air can be humidified by adding water or steam.

Air - Humidifying with Steam - Imperial Units

Estimate the amount of steam required (lb/h in 100 cfm) in humid air.

Air - Humidifying with Steam, SI units

Using steam to humidify air.

Air - Humidity Ratio

The mass of water vapor present in moist air - to the mass of dry air.

Air - Maximum Moisture Carrying Capacity

Maximum water content in humid air vs. temperature.

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Prandtl number for air vs. temperature and pressure.

Air - Properties at Gas-Liquid Equilibrium Conditions

Properties of air change along the boiling and condensation curves (temperature and pressure between triple point and critical point conditions). An air phase diagram included.

Air - Thermal Conductivity vs. Temperature and Pressure

Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.

Air - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables withdry air thermal diffusivity vs. temperarure and pressure. SI and Imperial units.

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Air in the steam will lower the surface temperatures in heat exchangers - and less heat will be transferred.

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Water may condensate when air is cooled in air conditioning systems.

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Maximum cooling tower efficiency is limited by the cooling air wet-bulb temperature.

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Dry Bulb, Wet Bulb and Dew Point temperatures can be used to determine the state of humid air.

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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.

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Mixing of Humid Air

The change in state wwhen mixing moist air - enthalpy, heat, temperature and specific humidity.

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Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling.

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Moist Air - Degree of Saturation

Humidity ratio of moist air to humidity ratio of saturated moist air.

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Density of the mix of dry air and water vapor - moist humid air.

Moist Air - Properties

Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy.

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Moist Air - Relative Humidity

Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.

Moist Air - Specific Volume

Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air

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Saturation pressure of water vapor in moist air vs. temperature.

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Weight of water vapor in air

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Calculate the moisture content in products like wood on wet and dry basis.

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