On a low cost 400 Watt Fogger,
With the lid off and the Fogger idling. :
I measured 160' C at the COLDEST part of the chamber. I measured 210-220' C at the wall where the cold part of the heater element passes through the chamber wall. The heater element was well over 400'C, past the upper limit of my instrument. Typically finned, air cooled, stainless steel, heaters run around 700'C in air. The fog stream was ~ 160'C with a tiny thermocouple in the exit stream. The chamber wall does not contribute much heat, the internal spiral heater does most of the work. The cover wall of the fogger was at 65'C when the lid was on. The fluid in use was dilute, mostly water. A more organic fluid would be hotter.
As the chamber is above the boiling point of the fluid, and constrains pressure inside, the outlet fluid temperature will be above the boiling point of the liquid involved, until the chamber wall cools below the BP.
The ceramic Klixon Switch (Thermostat) was a 150'C part. It has 5 cM of thin Aluminum between the point where the cold part of the heater element leads pass through the wall, and the Klixon location. So the heater element is quite hot. The Klixon is being driven more by radiative heating then by conduction.
When not creating output it emits a strong burning smell as the heater cracks the residual fluid. Greater then 400'C temperature means at least the initial fluid contacting the heater decomposes, period. Paper ignites at ~430' C under ideal conditions. (edit, just checked that)
Enough Said.
And Zorn, I note you or someone else have asked this question on two chemistry forums within the past two days. Google sees nearly all.
Steve
Last edited by mixedgas; 06-02-2014 at 16:43.
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When I still could have...