Re:DIY ventilation heat exchanger (2010)
by jorvi on Saturday December 23, 2023 @02:58PM
(#38747570)
Here in The Netherlands for classrooms we have regulations that aim for a classroom to stay below 950ppm CO2. I think almost every high school kid can remember how drowsy a full, poorly ventilated classroom would get.
Like I said I’m usually a scientific man but this is such a basic thing that anyone with any daily life experience would immediately recognize this 4000ppm (or whatever) as wrong.
Humans are also quite sensitive to noticing when a room is “stuffy”, so, yeah.
Re:DIY ventilation heat exchanger (2010)
by cameronh90 on Saturday December 23, 2023 @03:10PM
(#38747702)
Stuffiness is mostly a function of humidity.
The problem with these casual discussions about CO2 levels is they don’t control for other factors. Opening a window definitely wakes you up, but is it the cold breeze or the CO2?
Re:DIY ventilation heat exchanger (2010)
by maxerickson on Saturday December 23, 2023 @03:01PM
(#38747609)
What's the typical temperature change associated with opening the window?
I had some more time today, just with a cursory google I could find at least 5 studies that show cognitive decline with rising CO2 (and PM2.5, but that’s another discussion).
So yeah, my gut feeling was right. It’s probably good to not consider one negative study disproving a body of positive studies.
Re:DIY ventilation heat exchanger (2010)
by sarchertech on Sunday December 24, 2023 @08:01AM
(#38753204)
There’s not one negative study, there’s many studies over many years.
Here’s a good walkthrough of a meta study attempting to figure out what’s going on.
https://www.construction-physics.com/p/we-need-more-research...
ISS astronauts are routinely living in a 5000ppm environment. If the size of the effects of these studies were real, they’d be noticeable.
The most commonly cited study shows that 1400ppm cuts basic decision making ability by 25% and complex decision making ability by 50%. The study also shows a dose dependent response.
So how are people routinely operating at nearly 5 times that level for weeks at a time with no noticeable decline?
Results this large should by very easy to detect by simply measuring the CO2 levels at multiple SAT test taking sites and comparing scores.
Even without looking, an effect this large is the kind of thing that would jump out at the College Board or any other standardized test creator anytime they’re looking through their data to normalize scores or detect cheating.