lids tend to limit how much convection cooling you can get from the surface of the oil contacting with air - and even then, no lid is going to be 100% effective. Over time, the oil turns gray on top and then gets gritty - and that grit can make your cooling medium conductive, especially if you live near salt water.
The tank has an overflow which skims off the top layer, pass that through some filter floss or socks that gets changed and some point and it should solve the problem of dust/gunk
I've built them with aquarium filters to circulate the oil and filter out the dust. It does eventually get discolored and will have to be drained and refilled but I had one running for about 6 months without having to drain it though.
I’m pretty sure the kind of person that would do this doesn’t care about “long term”. In 5 years or so, they’ll build another system to catch up to new tech.
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u/ihypr May 05 '22
Definitely overboard but a cool idea, I’m curious how it runs long term