[Default] On Fri, 31 May 2013 18:39:54 -0400,"Crispin Pemberton-Pigott" <[email protected]> wrote:
>If you use metal, do not put insulation behind it. You must either waste a bit >of heat or use it for preheating air. This is very important, I think I once saw it posted that the temperature of the metal for purposes of longevity was as if it was the average temperature of the two surfaces. As stainless is a worse conductor than mild steel it follows that one should use the thinnest sheet needed to prevent the inner surface getting too hot. We had a customer who would not understand this, he was firing an oil burner into a fire tube heat exchanger through a tube, this tube burned out every few months and he would replace it with a thicker tube, which burned out faster. What we recommended, and he ignored, was to make the tube thin and bleed some excess air over it into the heat exchanger. In the past we talked about a "wash" of clay suspended in milk to occasionally paint the steel surface exposed to combustion, I tried it but as I don't run stoves for long enough never came to a conclusion. I have a cast iron Jotul stove here which is 30 years old and hasn't burned through, though there have been problems at the plate joints. AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
