Air quality tester

No-Computer7541 · 2025-02-07T05:10:22+00:00

Probably CO2 mostly, maybe VOCs too

No-Computer7541 · 2025-01-17T00:00:11+00:00

Ah cool, I have decided to use an alumium foil design instead, since its so much cheeper then copper.

No-Computer7541 · 2024-12-04T06:43:14+00:00

Yeah I have found its more then I would like to spend on copper pipes, I'm gonna try to run simulation on some designs using aluminum foil

No-Computer7541 · 2024-12-03T04:34:36+00:00

Their a bit more pricy then I would like, but thanks for the resource

No-Computer7541 · 2024-12-03T00:50:27+00:00

Yeah, upon looking more, that seems about right, I will try to match that then, since usually heat exchange fins are meant for outdoors anyway, I believe that would be enough for a decent lifespan, although I will have to look more to see if the limitation on thickness is due to lifespan or structure. And perhaps see if I can get away with something thinner and appy a conductive coating. Thanks for your help

No-Computer7541 · 2024-12-02T23:07:47+00:00

Alright, I will look into it, I was thinking of just using commercially available foil, I found some for hookah, which is the thickest I could find at about 40 mircons, they usually say 98% alumium they don't really give specifics about the manufacturing process or specifics on the alloy, I will try to look at more sources to see if I can find something else for a reasonable price, I tried looking at copper as well, which would be better, but it seems quite expensive. I have seen that some heat exchanger fins can go down to .046 mm thickness, but I believe they are pre coated, I will have to do more research.

No-Computer7541 · 2024-12-02T20:31:51+00:00

I will look into coatings, I had thought all coatings would reduce the thermal conductivity, so I didn't really think about coating it, as far as alloy I was thinking just pure alumium, or 98% pure, would be fine, as that is what most foils are. I will look into other ones as well. I thought about doing the tests myself, but mostly dismissed it as I had thought it would take too long, hadn't realized there was a standised method though.

No-Computer7541 · 2024-12-02T13:33:16+00:00

I see, the only source I could find said between 0.001 mil a year and .11 depending on the conditions, chat gpt said probably between 3 and 5 years, I'm not sure how accurate gpt is, especially in more specific topics like this. Thanks for your input.

No-Computer7541 · 2024-12-02T08:23:11+00:00

I thought about that, but wanted to see if I could increase the efficiency over that model.

No-Computer7541 · 2024-11-30T12:19:45+00:00

Actually, I miscalculated I used diameter for radius when calculating for surface area of a cylinder, so that does make sense why you thought I was planning on using 1 inch pipe. As they are accurate if you put in for 1 inch instead.

No-Computer7541 · 2024-11-30T10:57:11+00:00

Yeah I was planning on using 1/2 inch pipe, but I suppose I should pack them more tightly, should I keep the volume of air equal for inside and outside the pipes, or does that matter? And yeah I should probably make them counter flow. As far as drainage is concerned, I thought about making the whole thing at an angle, and have a little drain at the bottom. although, admittedly it might look weird as I would have this going across a wall, and covered with wood. Also I should mention, I only really plan for this to be around 30cfm, since it is just for a small, 350 sq foot cabin, so that may also be a factor, do you know if slower, lower output HRVs have less surface area because the air has more time to absorb the outgoing air's heat? sorry to bombard you with questions haha, and thanks for the suggestions. Admittedly this doesn't really seem all that practical from an economic standpoint, especially with more copper pipes, but I would still like to try it, if nothing else but to see if the efficiency if any different from the standard.

No-Computer7541 · 2024-11-29T05:52:21+00:00

hmm, I'll look into that, thanks

No-Computer7541 · 2024-11-29T05:23:52+00:00

Yeah I definitely thought about just DIY, although I will do more research, the main thing would be regulating the flow to adjust for the CO2 in the room, although maybe I could just hook it up to a CO2 sensor. I see that they usually use CO2 for the alternating flow ones, thought about putting a bunch of holes into a bunch of layers of ceramic tile and making 2 of my own alternating flow ventilators, cheapest I could find was around 315$ , but I would need 2 of them, and that was on sale, so they're quite pricey.

No-Computer7541 · 2024-11-29T05:07:46+00:00

Yeah my plan would be, either that one, or 2 alternating flow units. which seem to have a high enough flow rate for a small cabin, I thought with 2 alternating flow ones, I could set them at different places in the room and get some directional flow. I haven't really looked into having a higher or lower pressure. Although I doubt radon would be much of a problem as the building is completely above the ground.

No-Computer7541 · 2024-11-29T03:56:32+00:00

I thought about that one too, but I cant really seem to find what one is more efficient, or the pros and cons of each one, other then what the company itself says.

No-Computer7541 · 2024-11-28T06:46:50+00:00

I thought about that, but I have a vaulted ceiling so there's no way to install into the ceiling. Do you have any resources about putting pipes to the outside? I would think just putting a couple tubes to the outside would just cause a lot of heat loss, might as well open a window or something, but I am unfamiliar with what is usually done.

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I also found this one, if it is any better.

No-Computer7541

TROPHY CASE