Talk:Wet-bulb globe temperature

message: I noticed it has been changed several times in the logs. The use of a globe thermometer is correct for WBGTi. As seen in the publications from ISO and ACGIH. The globe thermometer measures radiant heat, and while the sun obviously produces it - so to does other objects.BarrenAvalanche (talk) 21:15, 23 August 2011 (UTC)
thread_title: WBGT Indoors uses a Globe Thermometer

message: This is just sort of an explanation of everything, when I get a couple of minutes I'll try and write a draft of WBGT that can actually be used as the article. In particular, I'd suggest some time is spent on the history of WBGT (which i'm not familiar with). As well as put a chart - i'd suggest the most current published ACGIH TLV chart and the one currently there. (I'm not sure wiki protocol on using/citing published sources, as I imagine there is a certain format / regulations)
Then obviously the formulas. Apparently they need to be explained - judging by the amount of times it is incorrectly editted and the focus solely on solar radiation. I'll cover that.
In order for the human body to function properly (Enzymes and all that good stuff to work), the body must be regulated at ‘normal’ temperature. Hyperthermia or Heat Stress occurs if the body’s internal temperature rises above this normal temperature (~>38C). Thermoregulation of the body occurs through evaporative cooling. Evaporative cooling is where the body secretes sweat, which then rests on the skin. In order for this liquid to evaporate, energy is needed. This energy is taken from the surrounding area by lowering the temperature which cools it – hence evaporative cooling.
Some factors affect the body’s ability to perform this. Exercise or extensive physical activity, heats up the body internally which makes it more prone to heat stress. Fortunately, after exposed to similar work regimens for several consecutive days (4-5 work days) the body begins to acclimatize and work more efficiently. 
Externally, the body can be affected by the conventional big three of heat transfer: convection, conduction and radiation. These heat the body. Clothing can also affect this as it can hold the liquid to one’s skin and limit moisture evaporation which obviously impairs the cooling.
Since the rate of moisture evaporation is so important with heat stress, I measure several parameters which affect this ability. While there are different standards to do so, (Humidex and Heat Index are sort of simplified versions), OSHA, CCOHS (the ones I’m familiar with) as well as many other different countries use WBGT. This is also an international standard; I’ll have to double check the number though (ISO ____).
WBGT uses a combination of wet bulb, dry bulb and globe temperature to calculate (as well as coefficients for clothing worn and varying threshold limit values for activity levels / acclimatization). From this, ACGIH publishes TLV which outline how much rest is needed per hour. This allows for us to consider other factors such as humidity (water more readily evaporates in drier conditions, once saturated evaporation becomes difficult), wind (if there is wind it’ll better distribute the evaporated water instead of concentrating it in area while it diffuses), and radiation (every single object emits / absorbs heat energy through thermal radiation, colder object obviously emit less and absorb more. Solar radiation is a portion but not the only means of).
Two different methods are used to calculate this based on the presence of radiant heat sources, known as WBGT outdoors. This can be slightly confusing as the sun is a radiant heat source, but being outdoors and in the shade eliminates this (the two objects are obstructed so there isn’t a radiative transfer between them) so WBGT indoors is used. Likewise, while indoors a radiant heat source such as a furnace or hot machinery, WBGTo is to be used. This is done to better model how the body feels the heat, as skin’s emissivity is very high so it does absorb a lot (WBGTo uses a dry bulb to sort of lower the WBGT reading as a globe temperature is the highest value and raises it so much more on the comparative scale – hence making the TLVs have to be higher).
Dry Bulb: The temperature typically used. It is a thermometer that is shielded to just measure the air temperature and disregard other factors such as radiant heat.
Wet Bulb: A thermometer covered in a wick. This thermometer is cooled by evaporative cooling, and therefore takes into affect parameters such as wind and humidity. This accounts for convection and evaporation. It is the ‘coldest’ of the three temperatures.
Globe: This is a thermometer surrounded by a black copper ball. This ball is to mimic the emissivity of skin and absorbs all of the radiant heat from nearby sources (which heats the air inside the ball and thus thermometer). Again radiant heat is emitted from everything, some objects more readily than others. Hotter temperature objects generally emit more radiant heat.  — Preceding unsigned comment added by BarrenAvalanche (talk • contribs) 02:15, 6 September 2011 (UTC)
thread_title:  Background Overview

message: Is the current name of this article (Wet Bulb Globe Temperature) properly capitalized?  Some sources capitalize the term this way, but several use all lowercase (hse.gov.uk, ccohs.ca, sciencedirect.com).  In addition, I found the following spelling variations:
*WetBulb Globe Temperature (CamelCase)
*Wet-bulb globe temperature (hyphen)
I'm mainly concerned about the capitalization though.  Hoof Hearted (talk) 16:05, 18 June 2014 (UTC)
replies: text: Thanks to  for correcting the capitalization. Hoof Hearted (talk) 20:03, 24 November 2014 (UTC)
thread_title:  Capitalization 

message: WBGT does not seem to  account for surface heat.  How far above the surface is WBGT taken?
Athletes and especially children are ON the surface not flying above it - how does it take surface heat into account (synthetic turf plastic, rubber and asphalt in the sunlight are like a hot stovetop when on while grass is cool in sunlight). 
 (synthetic turf plastic and rubber are like a hot stovetop) 
Since children are ON the surface not floating above -i- how does it take surface heainto account? Thi  is important since s(synthetic tu f plastic and rubbeplay surfaces, which are even hotter than asphalt, a a ntlike a hot stovet- a few feet above it may be fine but what is on it starts to fry from below ) 71.114.105.147 (talk) 12:58, 11 September 2023 (UTC)
thread_title:  WBGT and Surface heat?