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The bottleneck might be the air in the room

blog.mikebowler.ca

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Re: The bottleneck might be the air in the room

#201

Post by OutOfHere »

Lwerewolf wrote: post #162
londons_explore wrote: post #139

Earlier quoted context omitted.

Oxygen sensors used in car catalyst systems use a different effect based on electrochemistry. I see no reason that couldn't be minuaritized to grain-of-sand size. The question is if oxygen levels are as good an indicator as CO2 levels... I suspect not.

The ones in cars need to be heated up quite a bit in order to work, and you still need reference air. Otherwise, I'm pretty sure that CO2 isn't a problem but rather an indication of a lack of oxygen in the first place, so it technically could work... just not if you're measuring the environment itself.

No, it's nonsense to assert that CO2 is due to a lack of oxygen.

Re: The bottleneck might be the air in the room

#202

Post by OutOfHere »

noja wrote: post #145
londons_explore wrote: post #139

Earlier quoted context omitted.

Oxygen sensors used in car catalyst systems use a different effect based on electrochemistry. I see no reason that couldn't be minuaritized to grain-of-sand size. The question is if oxygen levels are as good an indicator as CO2 levels... I suspect not.

I don’t think we actually care about co2 levels. I think we use them as a proxy for o2 levels (same as our bodies do). So your idea would be great.

Huh. You don't know that, and are making it up. It's almost certainly false.

Re: The bottleneck might be the air in the room

#204

Post by microtonal »

nok22kon wrote: post #128
microtonal wrote: post #111

Earlier quoted context omitted.

No, it's not. You generally want to ventilate an office when you reach 1000ppm, but then the IKEA will often warn you already at 700ppm. 700ppm is fine.

you assume that the error will always be in one direction and if sometimes you ventilate a bit sooner than required, at 700, what? businesses will not put $200 meters in every room

businesses will not put $200 meters in every room

There are good $50 Euro meters. Besides that, I am not sure if that is true, at my wife's workplace, they put high-end CO2 meters in every larger room where multiple people meet. Admittedly, this was during COVID, so a lot of organizations were using CO2 levels as a proxy for finding whether a room was properly ventilated.

Re: The bottleneck might be the air in the room

#206

Post by paufernandez »

deanc wrote: post #13

I’m not saying this isn’t a legitimate concern but this really seems to have exploded amongst the tech community as the next obsession. I see this pop up on X every few weeks. Is the concern about this really based on actual science? Is there empirical data proving people are less productive or are damaging themselves as a result of heightened CO2 levels? And I don’t mean observational epidemiology studies.

We assume sometimes that everybody experiences this in the same way, but a lot of people might be super-sensitive to it, and others completely immune. It is quite possible that the ones obsessing about it are the sensitive ones, because they feel it much more.

Re: The bottleneck might be the air in the room

#207

Post by OutOfHere »

Gigachad wrote: post #151
microtonal wrote: post #111

Earlier quoted context omitted.

No, it's not. You generally want to ventilate an office when you reach 1000ppm, but then the IKEA will often warn you already at 700ppm. 700ppm is fine.

"Generally" is a vibe measurement to begin with. You won't notice any difference at all between 700ppm and 1000ppm. It's once you start hitting 2000ppm you are getting noticeable brain fog.

I disagree. I feel a very steady and progressive deterioration starting at 600 ppm. It becomes significant at 800 ppm. The studies back up the latter threshold.

Re: The bottleneck might be the air in the room

#208

Post by throwaway81523 »

bebe9494i4 wrote: post #174
inigyou wrote: post #133

Earlier quoted context omitted.

Would that not induce a responsibility to take reasonable preventative measures like wearing masks?

[flagged]

I haven't heard that 30 minute figure before, you have a reference? I've seen articles about medical workers using masks for much longer.

Installing air filtration and UVC in classrooms and meeting rooms certainly helps.

Since the mask shortage cleared up, HCW have been advised to stop re-using them. I re-use mind til they get dirty, but maybe I should replace them more often.

https://apnews.com/article/fda-n95-masks-plentiful-should-no... (2021)

2021 reddit thread: https://old.reddit.com/r/Masks4All/comments/lhnj10/one_of_th...

Re: The bottleneck might be the air in the room

#209

Post by doobiedowner »

nok22kon wrote: post #128
microtonal wrote: post #111

Earlier quoted context omitted.

No, it's not. You generally want to ventilate an office when you reach 1000ppm, but then the IKEA will often warn you already at 700ppm. 700ppm is fine.

you assume that the error will always be in one direction and if sometimes you ventilate a bit sooner than required, at 700, what? businesses will not put $200 meters in every room

You put one CO2 sensor in the return air duct and tie it to outside air control.

Re: The bottleneck might be the air in the room

#210

Post by kingkawn »

amelius wrote: post #171
kingkawn wrote: post #165

Earlier quoted context omitted.

Mesh with the other Apple/et al devices in the room to take multiple samples and aggregate the results for an overall picture of the ambient co2

What if a movie theater puts an Apple CO2 meter next to an air inlet? Everybody will think the air is safe.

If that’s the sole source and the application does thoughtful analysis it could determine that there are sections of the room that are better than others, yes
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