This page was contributed by Mark Schweter firstname.lastname@example.org
This design was developed by experimental methods and should NOT be construed to be a final design, or, the BEST. (It does work in my basement AND it started hazing the upstairs too!).
The haze stays suspended, at a usable level, for approximately an hour or so, after the unit is shut down. The heater element is switched separately so the fan can continue to run, thus cooling the unit after use.
The heater element is a monolithic aluminium cast unit, [see photo below] as used in "Party-Perk" type coffee makers.
The heater is filled to the mould mark on the inside, which is at the same height as the element winding, in the bulge, around the outside.
output is achieved in approximately one hour of heating. This slow start-up
is a side-effect of using the heater at 30V instead of it's designed 110V.
In the current test-bed, the heater is enclosed and packed in fibber
insulation, achieving approximately 525 F as opposed to 400 F when
un-enclosed. The heater draw at 30V is approximately 1.5A.
A) The "Party-Perk" heater element is 110VAC. In it's intended use, however, it is designed to sink to ~3 Gallons of water. I *have* turned one of these on on, removed from a pot, and it DID MELT!!!!!!. This previous experience led to the use of the "ballast" transformer in the heater circuit. The 30V transformer will allow the heater to reach only 400-550 F, depending on the enclosure/insulation design.
B) The "flash point" of mineral Oil is 444 F, open
cup test, per Sax's Dangerous Properties of Industrial Materials. This is
the second criteria for limiting the heater's maximum temperature.
The 12in. extension to
the hazer's output helps "collimate" the flow and increases the
dispersion speed into the room. The gap between the heater housing and the
fan, [see picture] allows additional air to be drawn through the fan and
keep full air velocity out the hazer's mouth. This suction design was used
because in the bench top trials airflow over the un-enclosed heater, in
sufficient velocity for dispersion, cooled the unit below 300oF severely
curtailing haze production.
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