121–130 of 327 posts
I own a CO2 monitor and it is shocking how high it can get in a house with two people just existing. 800 ppm or more. Outside air is 410. In a car with air on recirculate, it was getting to >1220 ppm, a level that impairs decision making and lowers brain function. I try to drive with air on fresh from now on. I don’t doubt the air in our conference room with 20 people gets super high in CO2 as the meeting goes on, an…
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Definitely true. You can measure how leaky a building is by sealing it up, blowing air in the door, and measuring how the pressure changes. If it’s very leaky the pressure doesn’t rise as much. https://en.wikipedia.org/wiki/Blower_door We used to assume that you’d get enough fresh air from infiltration through accidental sources. With a better sealed building, that’s not always the case and you may need to deliberate…
Thanks. I really hope hrv systems become standard. My brother has one in his house and it seems to help keep down co2. Do heat pumps ventilate? I have one in my new apartment and co2 seemed higher when it was off. But I was told they are not hrv systems. Maybe the blowing fan just caused more air circulation.
I own a CO2 monitor and it is shocking how high it can get in a house with two people just existing. 800 ppm or more. Outside air is 410. In a car with air on recirculate, it was getting to >1220 ppm, a level that impairs decision making and lowers brain function. I try to drive with air on fresh from now on. I don’t doubt the air in our conference room with 20 people gets super high in CO2 as the meeting goes on, an…
How many plants are needed to counter this?
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Exhaled breath is about 3.8% or 38000ppm so (20000) that's really high! I'm not too surprised since the turnover rate through a few small holes with a relatively large volume is bad. Reducing the facial volume would help a lot as each breath would expel more CO2 as a fractional percentage. It seems that any sort of face covering or even significant exercise could raise your ambient CO2 level well above 1000ppm. I'm a…
I found the study I read, and I'll re-link it here, it is eye opening to say the least! https://www.ncbi.nlm.nih.gov/pubmed/15893291
I'd argue that if there is an effect here it isn't the O2 concentration since a 1% change in atmospheric pressure happens at about 275ft. That's a pretty small hill!
A 1000ppm change in 02 partial pressure happens in about 30C temperature change. Really, if this is a real effect it better be actually due to some effect of C02 concentration.
My kid will get nosebleeds if the air is too dry, so I run humidifiers. Ventilating means I lose my hard won humid air. Any solutions?
His wife was literally being poisoned by the off-gassing in their new home. A relatively inexpensive air quality detector (Awair) now helps them keep tabs on things.
I've got an Awair in my office, and love it. When CO2 gets too high, I step out and work from my porch.
For those asking about house plants, the answer in my experience is that they don't make a difference. You have to have a lot of plants to offset the CO2 that you produce.
How are CO2 sensors built? Can you make them small and cheap enough to put in a phone, so I'd get a notification if the CO2 levels are rising?
> Can you make them small and cheap enough to put in a phone, so I'd get a notification if the CO2 levels are rising? Yes! It's possible. But the air circulation inside a smartphone is limited and newer phones are completely sealed for waterproofing, so there are still some doubts. > How are CO2 sensors built? Based on my very limited experience on playing with electronics, I would say... 1. Previously, many CO2 sens…
Curious where you are getting those figures from. Looking at the usual suspects (newark, digikey, sparkfun etc...) gives figures like $5-20 a piece (even at bulk).
Ive run into this before with some hobbyist electronics (high fov IR LEDs) where the prices were much higher than one would expect.
I did some research on this: https://enki.org/2018/06/06/co2-monitoring/ I now am very conscious about keeping a door open and getting some fresh air into the room. This is a challenge in modern, well-insulated buildings in Florida in the summer.
They are usually triggered by a timer or humidity, but it would be also possible to trigger them based on VOC or CO2 levels.
Single-room heat recovery ventilation units are relatively affordable (about $400). There are also some which can be integrated into the window frame if drilling a 6" hole into a wall isn't an option.
I own a CO2 monitor and it is shocking how high it can get in a house with two people just existing. 800 ppm or more. Outside air is 410. In a car with air on recirculate, it was getting to >1220 ppm, a level that impairs decision making and lowers brain function. I try to drive with air on fresh from now on. I don’t doubt the air in our conference room with 20 people gets super high in CO2 as the meeting goes on, an…
I picked up a CO2 monitor a while ago myself, and the biggest surprise was having it on in the morning in our bedroom with the doors closed. It was easily over 1000ppm IIRC. Ever since then I've made sure to set my AC system to run the "house fan" for 15 minutes or so every hour at night just to circulate the air in the house, and while the numbers went down significantly, anecdotally I swear that I wake up easier in…