#ThingsIWantToExist Heat-exchanger optimized for quietly moving substantial amounts of air between indoors & outdoors without wasting too much energy, even if large temperature diff.
7 tweets · July 2021 · 17 likes · 0 retweets · read on Twitter
#ThingsIWantToExist Heat-exchanger optimized for quietly moving substantial amounts of air between indoors & outdoors without wasting too much energy, even if large temperature diff.
Have been thinking about this in the background for awhile, but @m_ashcroft's tweet reminded me how important fresh air is. Thermal was the type of system I least grokked when studying Systems Design Engineering so I would need to do a bunch of reading in order to math this.
But the basic idea is that you have air coming in and air going out, and you run them past each other so that the incoming hot(/cold) air gets cooled(/warmed) by some room temperature air that you're about to get rid of anyway! Get rid of that CO₂ without messing temperature.
Original last line of that tweet was "Fresh O₂ without much heat delta." but then I recalled air's already 20% oxygen vs CO₂ measured in parts-per-million, so the issue is "humans get stupid when there's too much CO₂ in the air" (how the hell was this a useful adaptation?)
It seems like having plants would be good too, but if the issue is mainly at night and plants mainly absorb CO₂ when photosynthesizing... would need some grow-op style lights in a diff room, then a fan to cycle air to/from bedrooms.
I looked a few years ago and was unable to find good data on how much CO₂ a given plant absorbs and which are best. Just looked again and it's all crap. This quora answer has some tidbits but it measures gases in volume without specifying pressure 🙄🤦♀️ quora.com/How-many-indoo…
Seems like one obvious way to do the math would be some multiple of "how much mass does the plant add (above & below ground) per day?" This shit is surprisingly hard to google, but you could take some measurements. Could also make airtight box w CO₂ meter + grow lamp!