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Post by boatingfisherdude on Jun 26, 2012 16:25:36 GMT -8
Hi. New to the board....has anyone ever tried to preheat the incoming air to say...200 deg. F??? did this improve combustion efficiency? and raise the overall max burn temp?
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Post by Deleted on Jun 27, 2012 3:57:26 GMT -8
You can find some information about preheating in "Capturing Heat Three" www.aprovecho.org/lab/pubs/rl/stove-design/doc/122/rawIt is rather difficult to do it without fans. The downdraft/down feed pattern creates the most preheating for primary air. This can be suported by using heat conductive material for or inside the feed tube. To a certain extent it is self-regulating by the negative draft of preheating air. The pattern of the "Picasso Stove" can be used to preheat secondary air. Tubes or plates made of alumina can have a higher thermal conductivity than steel and have no problems with corrosion. www.andymetals.com/windows/b11.htm
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Post by peterberg on Jun 27, 2012 7:08:54 GMT -8
Hi. New to the board....has anyone ever tried to preheat the incoming air to say...200 deg. F??? did this improve combustion efficiency? and raise the overall max burn temp? Yes, I did. See the small scale development thread. A 2nd air stream is fed in at the front, washing around the feed tube under a lid and feeding into a vertical channel above the flames which are pulled sideways. I haven't been able to measure the temperature of the injected air, sorry. By this method, the stove itself was able to reach a temperature around 1200 C, equivalent to 2190 F. This resulted in a so-called pulse-mode, pushing the power of the stove up dramatically. And another project had the 2nd air via two steel ducts injected left and right above the fire. In that one, I could measure the temperature of the incoming air, which averaged out around 400 C. or 750 F. This resulted in a much higher quality burn than before.
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