41–50 of 72 posts
How much energy would it take to fractionally distill air? Ie. Liquify all the air in your house, boil off just the gasses you want, and pipe that back?
Then you could choose for example to have 23% oxygen instead of 20% for a little more alertness, 0 ppm CO2 for a fresh feeling, and get rid of all the trace offgasses, even those that wouldn't be absorbed by activated charcoal.
Earlier quoted context omitted.
Yes it is. I used to ventillate my room in Uni when it was way past -20 C outside. As long as you have decent heating it is not a big deal if you do it periodically.
Assuming that the air outside is fresh and not a thick mess of coal smoke like in many places.
Earlier quoted context omitted.
Ozone is very dangerous. The EPA concluded it poses serious health risks back in 2013 (causes asthma and respiratory harm, short and long term exposure is linked to likely early death, and even linked to cardiovascular problems.) Cleaning air is simple; you don't need to look to obscure Ozone/UV devices. For gasses/VOCs, you need a carbon filter. The larger the filter and more air that moves past it, the better. You…
> None of that will replace the lack of oxygen, though-so open a window. I would think that it would be really hard to make any kind of dent in how much oxygen is in the room... wouldn't, by the time you get there, you have long long since died of carbon dioxide poisoning?
Here’s the basic levels of CO2 that are acceptable in a room. I know I get drowsy in rooms without good airflow when in meetings at the office.
https://www.engineeringtoolbox.com/amp/co2-comfort-level-d_1...
I don't understand why there hasn't a lot of resources put into approaches like this.
It works, but it's hard to do. * The far-UV lamps cost way too much. * There are a sizable number of fake ones out there. * There aren't standards and inspection tools for this. A useful tool would be a UV detector on a stick. You touch it to the ceiling, and it reports on whether there's enough UV in the right wavelengths to kill viruses. The idea is to have emitters which radiate horizontally, with most of the UV u…
I haven't seen one of the main arguments against UV efficiency in the context of an HVAC system. Most common UV solutions simply cannot clean at the speed the air goes through the systems in most buildings. When you have to maintain 6 air changes per hour, the UV solutions are simply not manageable. There are other limitations but that's the main issue as far as I can tell talking to facility managers.
I don't understand why there hasn't a lot of resources put into approaches like this.
It works, but it's hard to do. * The far-UV lamps cost way too much. * There are a sizable number of fake ones out there. * There aren't standards and inspection tools for this. A useful tool would be a UV detector on a stick. You touch it to the ceiling, and it reports on whether there's enough UV in the right wavelengths to kill viruses. The idea is to have emitters which radiate horizontally, with most of the UV u…
https://youtu.be/2T39BHvrHZ0 (“How to use a UVC germicidal lamp safely”)
Earlier quoted context omitted.
> None of that will replace the lack of oxygen, though-so open a window. I would think that it would be really hard to make any kind of dent in how much oxygen is in the room... wouldn't, by the time you get there, you have long long since died of carbon dioxide poisoning?
Just small increases in the CO2 concentration can cause brain fog and headaches even if you won’t literally die from the room. Normally the feeling of a room being “stuffy” is the first sign. That’s a mere 600ppm where that begins to happen. Here’s the basic levels of CO2 that are acceptable in a room. I know I get drowsy in rooms without good airflow when in meetings at the office. https://www.engineeringtoolbox.com…
Earlier quoted context omitted.
> None of that will replace the lack of oxygen, though-so open a window. I would think that it would be really hard to make any kind of dent in how much oxygen is in the room... wouldn't, by the time you get there, you have long long since died of carbon dioxide poisoning?
Just small increases in the CO2 concentration can cause brain fog and headaches even if you won’t literally die from the room. Normally the feeling of a room being “stuffy” is the first sign. That’s a mere 600ppm where that begins to happen. Here’s the basic levels of CO2 that are acceptable in a room. I know I get drowsy in rooms without good airflow when in meetings at the office. https://www.engineeringtoolbox.com…
I find the obsession with having a sterile environment ridiculous. Our bodies themselves are teeming with microbes and viruses, actually our bodies contain more of them than our own human cells. They play an important role in our digestive system, as well as our metabolism and also keeping our immune system on its guard. What needs to be done is not to eliminate those actors, but rather to make our bodies resilient t…
How? Magic?