General > General Technical Chat
Open Source Ventilator
pipe2null:
Great links! I clicked through and found a study done on killing SARS virus (somewhat similar to COVID-19) that includes UVC and heat exposure times/intensities. Numbers in units I don't fully understand, but might make sense to someone else here. The air purifier I linked earlier is advertised as UVC, but no idea on the intensity, etc, or if the light is concentrated on the filter where viruses "might" get caught long enough for full exposure... Hmm...
Blitzschnitzel:
The results from a quick google research all revolve around water as a medium or dry on hard surfaces. I don't know if those recommendations can be translated to an aerosol. I don’t think you need a fan to move the air because the exhaled air comes through a pressure valve anyways. Just the airstream from the exhale could move the air along. You could have something similar to a distillation spiral around an UV lamp with reflectors on the outside.
--- Quote from: rdl on March 30, 2020, 01:42:23 am ---MIT is working on this. Lots of info available there.
https://e-vent.mit.edu/
--- End quote ---
There are probably a dozen projects working with Ambubags right now and they share their designs with each other. :)
pipe2null:
Hmm. My current thought is passing the exhaled air through a filter and illuminating one or both sides of the filter with UVC. Provided the light penetrates deep enough on/in the filter to reach trapped viruses, the exposure time would be significantly increased since the virus is trapped and you might not need as intense a UVC source. I'm not sure if generated heat from the lamp would help keep the filter dry, or extend the useful period of the filter itself. I only mentioned the air purifier thing since it's an off the shelf product that includes some type of filtration with UVC. Plus a fan providing a little negative air pressure helps make sure contaminated air gets where you intend it to go.
NiHaoMike:
--- Quote from: james_s on March 29, 2020, 10:56:29 pm ---Even if it was enough heat to be an issue the hot sterilized air could be vented outside.
--- End quote ---
If you're going to vent it outside, just send a powerful arc through it, which will give you intense heat, lots of UV, and lots of ozone.
james_s:
An arc is probably overkill, it will quickly deteriorate electrodes and require a high current power supply. A mercury discharge lamp is a much safer and simpler way to generate UV and a nochrome heater is a simple and reliable way to heat air. We don't need to hear it to thousands of degrees.
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