Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Wet Bulb Globe Temperature (WBGT)

The Wet Bulb Globe Temperature can be used to measure the general Heat-Stress index.

Sponsored Links

The Wet Bulb Globe Temperature (WBGT) can be measured by 

  • the black globe temperature 
  • the natural wet-bulb temperature
  • the shade air temperature

Outdoor with Solar Radiation

The Wet Bulb Globe Temperature (WBGT) for outdoor conditions:

WBGT = 0.7 Tnwb + 0.2 Tg + 0.1 Ta                                (1)

where 

WBGT = the Wet Bulb Globe Temperature (oC)

Tnwb =  the natural wet-bulb temperature (oC)

Tg = the black globe temperature (oC)

Ta = the (shade) air temperature (oC)

The black globe thermometer (Tg)

A 150 mm (6 inch) black globe with a thermometer located at the centre.

Represents the integrated effects of radiation and wind.

The natural wet-bulb temperature (Tnwb)

A thermometer with its bulb covered with a wettened cotton wick supplied with water. Evaporation cools the thermometer. Not shielded from wind or radiation.

Represents the integrated effect of humidity, wind and radiation.

The (shade) air temperature (Ta)

Measured by a thermometer shielded from radiation.

Indoor - with negligible Solar Radiation

The Wet Bulb Globe Temperature (WBGT) can be calculated for indoor conditions as 

WBGT = 0.7 Tnwb + 0.3 Tg                            (2)

Sponsored Links

Related Topics

Air Psychrometrics

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

Physiology

Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more.

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • The Engineering ToolBox (2010). Wet Bulb Globe Temperature (WBGT). [online] Available at: https://www.engineeringtoolbox.com/wet-bulb-globe-temperature-WBGT-d_1630.html [Accessed Day Month Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

6 6

Sponsored Links
.