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Once temps hit more than 37C and 100% humidity, the human body loses the ability to regulate it's temperature through sweating.
This temperature happens a lot in Taiwan and is also 100% humidity. It's not comfortable.
South Australia doesn't have humidity.
I've worked in mines in the desert in South Australia where temps semi regularly hit 46-47 degrees.
It's OK (ish) because the humidity is low. But you can drink a litre an hour all day (11+ hours) and not need to pee. All that water goes somewhere.
The underground workings are often more dangerous, with lower temperatures but higher humidity. Once wet bulb temps get above 34 degrees underground personnel need to retreat from the area and the only work that can be done there then is work to fix the ventilation.
There's heat stress meters that measure wet and dry bulb temperatures and airflow, and can basically compute cooling power in watts. Not enough cooling power -> everyone out.
I can only imagine, as I sit on the Stockholm metro with cold and damp feet after walking through snow and some slush to get to the bus earlier.
I am happy to hear that you have rules and regulations for these eventualities.
Yeah, in those conditions, you live and die by wet bulb temperatures.
Now, please correct me if I am wrong, but would drinking cold stuff balance out the temperature difference? Like say it's 40c wet bulb, but you have access to cold water to drink, would that work?
You couldn't physically drink enough water. Math is not my strong suit but this seems pretty straightforward.
It takes one calorie to raise the temperature of 1 gram of water by 1 degree Celsius, by definition. Plugging in some numbers (a liter of water starting at a very frosty 1 C) takes almost 40 kilocalories or about 160 kiloJoules of energy. That's like half of your "simply existing" calories per hour, so you'd need to consume 2 liters of ice-cold water every hour (and excrete every gram of it to 40, which you aren't doing with your living body) just to break even.
It gets more complicated when you factor in evaporative cooling and I already said I'm not a math-man but the environmental factor is simply too strong for biology.
Fair, I was uncertain if the cold water would be sufficient. Thanks for your reply!
It's dry as a bone here right now. (That's good)
Also means it's all a big tinderbox. (That's bad)
It makes evaporative air conditioners work better (That's good)
Yup. Wet-bulb conditions are no joke and can kill, making functioning A/C a life-saving technology if not an outright requirement for survival.
Actually at 100% humidity the highest survivable temperature for a human is 35 C° wet bulb temperature.
But that is with everything else being perfect, being healthy, in the shade, and perfectly hydrated, and zero physical activity.
A more realistic maximum survivable wet bulb temperature is closer to 30 C°. But 35 C° is the absolute maximum, where above that everybody dies.
Sorry, but that's wrong. WBGT takes radiative heat into effect when it's calculated. The sun and shade effectively have two different WBGT readings. That's why its measured with a black globe. Protocol is to measure ~2 meters heigh in direct sunlight away from structures that block wind so you get the worse case scenario. Like any whether reading, its localized.
Isn't this called wet bulb or something and lethal?
That was it, yes!