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A comment on The emergence of heat and humidity too severe for human tolerance (2020). Parent comment

Re:The emergence of heat and humidity too severe for human t... by kevingadd on Wednesday August 11, 2021 @05:04AM (#28139721)
Eventually it'll be hot enough outside that the "cooler" inside is not cool enough without air conditioning.
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Re:The emergence of heat and humidity too severe for human t... by ajuc on Wednesday August 11, 2021 @07:05AM (#28140528)
This is temperature of air (big amplitude) vs temperature of ground X meters undergrounds. If you go deep enough it doesn't matter how hot it is outside - the temperature is basically constant the whole year.

http://www.rynekinstalacyjny.pl/images/photos/24/3877/__b_An...

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Re:The emergence of heat and humidity too severe for human t... by tullianus on Wednesday August 11, 2021 @11:06AM (#28142910)
I'd bet that data is from sensors with low heat dissipation. Unfortuantely, humans produce ~100W of heat each. If you're using a small underground basement as a place to escape lethal heat aboveground, or even a large underground basement with high people/m³, this added heat will steadily increase the basement's wall temperature.

The rate of temperature increase depends on physical properties of the basement walls: using the first equation here[0] as an approximation, set x to 0, set q"_o to 100W*(# people)/(basement surface area). α is the thermal diffusivity of the wall material [1].

[0] https://slideplayer.com/slide/1676039/7/images/9/Semi-Infini... [1] https://en.wikipedia.org/wiki/Thermal_diffusivity

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