121–130 of 322 posts
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Theres no difference in heating efficiency for any source. Heat is heat and it doesn't really matter if it's generated from a heating element in a furnace or an LED light. And with the light you're at least getting dual use out of it. If they have a gas furnace it might be different but that would also depend on how their electricity is generated.
except a heat pump which is far more efficient
I was lucky to get my hands on 5 proper co2 sensors from university, while I was teaching and working. So plenty of test places. What I found: -Just a couple of hours in a office, without ventilation spikes the co2 enough to make everyone dizzy and tired by the end of the day. Keeping eye on the meter and ventilating properly, increased everyones productivity and people werent so tired by the end of the day. - Classr…
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I have developed custom Ethylene sensors in the past for customers, and Dynament (UK) is a manufacturer that I can definitely recommend if anyone wants to do this and go down the DIY electronics route without having to dig through a bunch of Chinese products to find the "right one". https://www.dynament.com/products/gas-sensors/standard-non-e...
I remember looking into this years ago, and the prices were in the $100-$200 range for low volumes. Was this your experience?
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I believe this is just a transcript of the ongoing experiment, see "status: in progress". Looks like gwern didn't write up the data yet, they have a lot of other experiments going on at the same time most likely..
It is an admittedly biased self-study that while very detailed in explaining the approach and methodology is very flawed from a credibility standpoint though.
I was lucky to get my hands on 5 proper co2 sensors from university, while I was teaching and working. So plenty of test places. What I found: -Just a couple of hours in a office, without ventilation spikes the co2 enough to make everyone dizzy and tired by the end of the day. Keeping eye on the meter and ventilating properly, increased everyones productivity and people werent so tired by the end of the day. - Classr…
+1 here. I worked at an IoT startup with a lot of gas sensors. When we tested the CO2 sensor, we immediately noticed a correlation between early-afternoon sleepiness and high CO2 levels. Opening the door to the outside world lowered levels and within 5 minutes we felt more awake. It changed how I work: I still like to be warm and cozy, but now I'll bundle up and endure changing the air rather than seal every door and…
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except a heat pump which is far more efficient
Until you get to below zero.
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Good observation. That said, co2 and o2 should move pretty much in tandem if the source of high co2 is human breathing + limited ventilation, right? This could potentially account for why no ill effects of high co2 were found in submarines. Presumably o2 supply there is well maintained. Do household air quality standards include o2 levels?
They do move in tandem on a molar basis, but because there is so much more O2 in the air, even very high concentrations of CO2 have barely changed the concentration of O2.
Every time you breathe in, you not only breath in O2, but also CO2, thus lowering the amount of CO2 in the room relatively to the amount of oxygen.
In other words, 1000 ppm CO2 in the air do not mean 1000 ppm O2 less, but significantly more parts of oxygen less.
Self experiments like these are a great re-enforcement of how insanely hard it is to do accurate, reproducible science. This submission tells us absolutely nothing due to the lack of rigor applied. SO many potential confounding variables, there is zero value in what is being done here.