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Training my sense of CO2 ppm

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Re: Training my sense of CO2 ppm

#91

Post by elif »

londons_explore wrote: post #85
teruakohatu wrote: post #73

Earlier quoted context omitted.

That I'd very interesting. Is ther data on how much C02 is consumed by lettece?

You need to approximately grow as many kg of plants each day as you eat food each day. That's a lot of plants. Possible, but your house will feel more like a rainforest.

I run 2 dehumidifiers on top of air conditioning and stay under 60% (almost always under 54%).

Also the hydroponics water the roots of the plants in a closed system so very little of the moisture is evaporated.

Also I'm not sure about your calculation since poop. I would imagine it would be kg consumed - 0.45*kg pooped - house leakiness loss

Re: Training my sense of CO2 ppm

#92

Post by elif »

teruakohatu wrote: post #73
elif wrote: post #71

I've been using the uHoo air monitor for the last few months. I have one in the bedroom, living room, and office. It monitors many air factors, but CO2 was my primary focus. My original goal was to have a fresh air intake activate automatically at certain concentration levels, if the outside ambient temperature/humidity were appropriate. However, living in a hot humid place, the data I got made that solution seem fut…

That I'd very interesting. Is ther data on how much C02 is consumed by lettece?

From my calculations I was only expecting about an 80ppm difference, but in practice overnight when the humans and animals are in bedrooms, the living room with plants shoots down to 400 while before it would get about 550 in my leaky old house.

Re: Training my sense of CO2 ppm

#93

Post by bjoli »

dredmorbius wrote: post #83
bjoli wrote: post #79

Earlier quoted context omitted.

On a related note: A friend of mine was exposed to high co2 levels while on a freight ship. He says it is the absolute worst feeling he has ever felt, with panic and convulsions and vomiting. He survived because a colleague of his managed to get him out. Kinda makes me wonder why it is still allowed in animal slaughter. It is cheap and gets the job done, but there must be better gasses. There are loads that just make…

That sounds like it might have been carbon monoxide poisoning. https://www.mayoclinic.org/diseases-conditions/carbon-monoxi... Though symptoms are quite similar to those of CO2 poisoning: https://www.emedicinehealth.com/wilderness_carbon_dioxide_to... One of the symptoms of CO poisoning I've heard mentioned is of a sense of doom or dread.

Nope, that was co2. It is similar to CO, but in animals at least it gives a more aversive reaction.

Re: Training my sense of CO2 ppm

#94

Post by travisjungroth »

travisjungroth wrote: post #64
lsh123 wrote: post #58

I have a cheap (about $20-25 a couple years ago) sensor from Amazon in my plane. It calibrates itself when I turn it on and I check it works on the ground before every flight - open the window after starting the engine and see co2 going up ;) Granted, I don’t really care about any small errors or small changes - I want the sensors to warn me if co2 concentration goes up significantly (e.g. because of leaks from exhau…

I've never heard of that. Do you have a CO sensor as well? Those are common, mostly in a very cheap one-time-use dot form.

I should say "disposable" instead of "one time use". https://www.aircraftspruce.com/catalog/pspages/asaCO.php

Re: Training my sense of CO2 ppm

#95

Post by tsol »

elif wrote: post #71

I've been using the uHoo air monitor for the last few months. I have one in the bedroom, living room, and office. It monitors many air factors, but CO2 was my primary focus. My original goal was to have a fresh air intake activate automatically at certain concentration levels, if the outside ambient temperature/humidity were appropriate. However, living in a hot humid place, the data I got made that solution seem fut…

>However, this failure lead me to the fortuitous discovery that by adding 36 hydroponic heads of lettuce, I am now going beyond outside CO2 levels

Comments like this are why I come to HN to discuss. I honestly want to try this now lol

Re: Training my sense of CO2 ppm

#96

Post by danans »

kadoban wrote: post #43
danans wrote: post #25

Earlier quoted context omitted.

If you do this (install an HRV), expect it to cost many thousands, and make sure all your duct-work is running through very well insulated spaces, or you will obviate the heat recovery part, and you will just have a very expensive ventilator.

Yeah, I'd assume it'd have to wait until I'm going to replace an hvac system anyway. But in my price-range of homes, that's fairly likely to be ~required anyway. Sounds like something that would be worth it, I spend almost all of my time indoors and we have pets pumping out co2 as well.

> But in my price-range of homes, that's fairly likely to be ~required anyway.

TTBOMK, there is nowhere in the US that an HRV or ERV is required by code [1], regardless of the price range. There are a lot of very expensive homes built with no thought to indoor air quality.

In many places in the US, due to higher air-tightness requirements, mechanical ventilation is required, but that can be as minimal as having bath fans and a kitchen extractor fan.

1. Ontario CA requires them on new builds https://www.huskyair.com/blog/newsflash-ontario-is-making-hr.... Maybe Germany also?

Re: Training my sense of CO2 ppm

#97

Post by bumbledraven »

b112 wrote: post #52
bumbledraven wrote: post #29

Earlier quoted context omitted.

Just how "wildly" inaccurate are we talking about? What should the outside CO2 readings actually look like under those conditions?

As an example, close to a busy road, you may as well double the number in parent. Calibration by outside air is strange.

Close to a busy road, sure.

Re: Training my sense of CO2 ppm

#98

Post by amitamit »

CoastalCoder wrote: post #76
amitamit wrote: post #74

Earlier quoted context omitted.

Agreed!! I have also tried many different CO2 meters (all consumer-grade) and Aranet has been consistently the most accurate among the CO2 meters I have used.

How did you determine the accuracy of your CO2 meters?

I measured the CO2 levels in one room using several different CO2 monitors - under similar conditions (steady-state with one person in the room, windows partially open) on different days; Aranet readings were the most stable and consistent, while matching the "expected ppm".

I also tested the monitors by exhaling directly on them, and confirming the change in readings.

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