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Re[2]: Radiant energy cooktops




This is interesting...I would have guessed that any metallic pan would work
with the RF cook top. I guess the heating is not due to eddy currents but
rather by causing magnetic domains to flip-flop? Hmm...I guess if your pot
boiled dry, the heating mechanism would automatically limit the pot
temperature to the Curie temp for that alloy?


J. D. Sample (501) 698-4625


John:

Clarence Bennett by private e-mail has questioned whether the freq is RF.
For this I cannot vouch. I CAN say that if a magnet is not attracted to
the bottom of the pan, the unit will just beep at you and assume there is
no pan. (Kicking in the 'pacemaker' safety feature.) Maybe someone can
clarify on the frequency.

Are there magnetic domains in non-ferromagnetic materials? Stainless
steel? Copper? Aluminum alloys? I wasn't aware there there was.

We have had two kinds of incidents with our cooktop. Both due to
negligence. First, there is one "burner" which is fast heating. One of my
daughters put a cermic coated cast iron skillet on it soon after
installation and turned it up on high. Shortly, ceramic chips started
popping off the surface. She had heated the iron up faster than thermal
expansion of the ceramic could keep up. On another occasion my son let a
pot boil dry. The system was working on approaching the Curie pt when it
was stopped. (I still think that burner does not work as well anymore.)

Dewey

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Dewey I. Dykstra, Jr. Phone: (208)385-3105
Professor of Physics Dept: (208)385-3775
Department of Physics/SN318 Fax: (208)385-4330
Boise State University dykstrad@varney.idbsu.edu
1910 University Drive Boise Highlanders
Boise, ID 83725-1570 novice piper
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