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Read the article in the MAG. Fairly simplified and quite useful for explaining to management. However the Thermal side was very over simplified. Our app required 5 to 9 zone control of a cylindrical furnace (semiconductor processing. (LPE and CID) so the interaction and variation due to horizontal and vertical tubes were of major concern.
Fortunately, I do not do the Process Furnaces anymore, that customer was bought and the entire factory moved out. (We do system level consulting.)