If the dry bulb temperature of air is 18oC and the web bulb temperature is 12oC - then the difference between them is 6oC. By using the table above
The state of air with dry bulb temperature 75oF and wet bulb temperature 62.5oF can be visualized in the psychrometric chart as indicated below.
The table below can be used to estimate the relative humidity of air if dry and wet bulb temperatures are known.
|Tdb - Twb |
|Relative Humidity - RH (%)|
|Dry Bulb Temperature - Tdb (oF)|
Download and print Air - Relative Humidity vs. Dry and Wet Bulb Temperatures chart
Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
Instrumentation and process control systems - design and documentation.
The mass of water vapor present in moist air - to the mass of dry air.
Psychrometric chart for air at barometric pressure 29.921 inches of Mercury and temperature ranging 20oF to 120oF.
Classification of dehumidifiers.
Comfort vs. dry bulb, wet bulb and dew point temperature.
Dry Bulb, Wet Bulb and Dew Point temperatures can be used to determine the state of humid air.
Enthalpy change and temperature rise when heating humid air without adding moisture.
Pressure, temperature and volume in a perfect ideal gas like moist air (air with water vapor).
The change in state wwhen mixing moist air - enthalpy, heat, temperature and specific humidity.
The pressure in a mixture of dry air and water vapor - humid or moist air - can be estimated by using Daltons Law of partial pressures.
Humidity ratio of moist air to humidity ratio of saturated moist air.
Density of moist air vs. pressure ranging 75 - 1000 mmHg.
Density of the mix of dry air and water vapor - moist humid air.
Sensible and latent heat of moist air.
Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy.
Dry and wet bulb temperatures, saturation pressure, water vapor weight, specific volume, heat and more.
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
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.
The relationship between the psycrometric chart and the Mollier diagram.
Saturation pressure of water vapor in moist air vs. temperature.
The definition of STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure.
Comparing advantages and disadvantages of thermocouples, RTDs and thermistors temperature sensors.
Thermocouples - types, principles and temperature ranges.
The Wet Bulb Globe Temperature can be used to measure the general Heat-Stress index.
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