Introduction: Low Cost Disinfection Unit for Covid-19 (less Than 12USD)
This is an naive attempt for a low cost disinfection unit. It's pretty easy to make, I do hope people replicate my project and stay safe with the Covid-19 Pandemic.
It is amazing that a lamp could clean a surface better than bleach. I tried to explain that to the most skeptical person I know, my ex-girlfriend. And here is my attempt.
Here is a trusted websites that claims that UV-C disable Sars-Covid-2, follow by the amount of energy to disable:
https://www.cdc.gov/coronavirus/2019-ncov/hcp/ppe-... (0.5–950 J/cm2)
In this websites claims that the amount of energy disables SARS-COVID-2 is 7 J/cm2
On Osram HNS lamps specification claims that each of their 4W lamp produce only 0.9W of UV-C.
Here is how I calculated the the UV dose:
=(UV_ENERGY* time )/(4 * π*distance^2)
UV_DOSE = 0.9 * 60 / 4 * pi * 0.1
The result is 429 J/m2
About the calculation really suprised me is that the distance is very important. Is really important to keep it closer. I am also not considering the aluminium reflection.
Bill Of Material:
Name , Quantity, Price,
Osram UV-C 4W, 16 BRL (2.99 USD)
Florecent Driver 8W (3.79 USD)
Glue ( I use about 10% of a bottle that cost 2.99 USD)
2 x G4 Connectors, 1 BRL
Timer, 20 BRL(3.74 USD)
Carton Box (Free in the supermarket)
Copper Wire, 0.3 BRL
2 X Brass m4 Screw( 0.2 BRL)
4 m4 bolt, 0.2 BRL
Chicken wire, 1.6 BRL
Step 1: First Glue the Aluminium Foil
First glue the Aluminium Foil to the box
Step 2: Bend the Aluminium Wire
Step 3: Install the Driver
The driver came with a elastic band.
Step 4: Finished!
The idea is to make the cheapest disinfection chamber possible, and using materials that you can find anywhere!
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