on page 2 of the PDF / page 153 of the uploaded book at https://www.jefftk.com/harris-and-stokes-1943.pdf, it specifies that they vaporized the glycol by heating it. Maybe I’ve missed this in your writeups on the topic, but did you rule out just putting it in a slow cooker or similar at an appropriate temperature and using a fan like the original experiment? It seems superficially as if heating it into evaporation would be both much easier to do and also a more accurate replication of the original work? Ultrasonic humidifiers put water in the air by emitting tiny droplets, which then evaporate if the air is dry enough. It seems like the pathogen control impact of having lots of little drops of TEG would probably be different from having the TEG actually evaporated as it was in the original research?
This rabbit hole leads me to https://en.wikipedia.org/wiki/Triethylene_glycol where they mention that it’s still a disinfectant when aerosolized, so maybe my concern about evaporation vs making droplets is irrelevant. The other interesting hint there is its use in fog machines—is your current build basically a DIY fog machine for low volumes of party fog? I wonder whether fog machines that are already installed in crowd-gathering venues could be used for infection control!
Are you planning any measurements of how far the TEG travels or how effectively the humidifier-generated droplets clean the air? The settling plate count technique described in the pdf seems shaped like a great science fair type project for kids to help out with!
on page 2 of the PDF / page 153 of the uploaded book at https://www.jefftk.com/harris-and-stokes-1943.pdf, it specifies that they vaporized the glycol by heating it. Maybe I’ve missed this in your writeups on the topic, but did you rule out just putting it in a slow cooker or similar at an appropriate temperature and using a fan like the original experiment? It seems superficially as if heating it into evaporation would be both much easier to do and also a more accurate replication of the original work? Ultrasonic humidifiers put water in the air by emitting tiny droplets, which then evaporate if the air is dry enough. It seems like the pathogen control impact of having lots of little drops of TEG would probably be different from having the TEG actually evaporated as it was in the original research?
This rabbit hole leads me to https://en.wikipedia.org/wiki/Triethylene_glycol where they mention that it’s still a disinfectant when aerosolized, so maybe my concern about evaporation vs making droplets is irrelevant. The other interesting hint there is its use in fog machines—is your current build basically a DIY fog machine for low volumes of party fog? I wonder whether fog machines that are already installed in crowd-gathering venues could be used for infection control!
Are you planning any measurements of how far the TEG travels or how effectively the humidifier-generated droplets clean the air? The settling plate count technique described in the pdf seems shaped like a great science fair type project for kids to help out with!
I think that’s the case—if you look at more recent work they’ve used a wide range of ways of getting glycol into the air.
It’s more than that: fog machines used today (when used with glycols, which is the normal fog juice) are already performing infection control!
I’m not, though if anyone wanted to come test efficacy I’d be happy for them to measure the effect of us having it on sometimes and off other times.