Note that the saturation pressure of water vapor, - and the maximum humidity ratio, increases dramatically with air temperature. This important for the capacity of drying processes.
The humidity ratio for saturated moist air at 20oC with water vapor partial pressure 2333 Pa at atmospheric pressure of 101325 Pa (1013 mbar, 760 mmHg) can be calculated as:
x = 0.62198 (2333 Pa) / ((101325 Pa) - (2333 Pa))
= 0.0147 (kg/kg)
= 14.7 (g/kg)
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
Absolute humidity is the actual mass of water vapor present in the air water vapor mixture.
Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.
Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures.
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.
Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 °C.
The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity.
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.
Estimate the amount of steam required (lb/h in 100 cfm) in humid air.
Using steam to humidify air.
Relative humidity in moist air can estimated by measuring the dry and wet bulb temperature.
Maximum water content in humid air vs. temperature.
The moisture holding capacity of air increases with temperature.
Prandtl number for air vs. temperature and pressure.
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.
Figures and tables with isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and pressure ranging 0.01 to 10000 bara.
Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.
Figures and tables withdry air thermal diffusivity vs. temperarure and pressure. SI and Imperial units.
Classification of dehumidifiers.
Thermodynamic properties of dry air - specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.
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.
Evaporative cooling tutorial.
The Great Sensible Heat Factor is the ratio sensible to total heat in a cooling coil.
Latent heat is the heat when supplied to or removed from air results in a change in moisture content - the temperature of the air is not changed.
The change in state wwhen mixing moist air - enthalpy, heat, temperature and specific humidity.
Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling.
Humidity ratio of moist air to humidity ratio of saturated moist air.
Density of the mix of dry air and water vapor - moist humid air.
Sensible and latent heat of moist air.
Dry and wet bulb temperature, specific volume, relative humidity, enthalpy and more.
Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.
Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air
Specific humidity of moist air vs. relative humidity, water vapor and air density.
Calculate the moisture content in products like wood on wet and dry basis.
Recommended relative humidity level.
Recommended relative humidity in production and process environments - like libraries, breweries, storages and more.
Air flow required to remove vapor production from a room.
A salt solutions can be used maintain a particular value of relative humidity.
Online calculator, figures and tables with water saturation (vapor) pressure at temperatures ranging 0 to 370 °C (32 to 700°F) - in Imperial and SI Units.
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