[NatureNS] Stove Blacking and heat transmission

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To: Naturens <naturens@chebucto.ns.ca>
From: David Webster <dwebster@glinx.com>
Date: Mon, 25 May 2020 20:55:06 -0300
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Dear All,

     I heat the house mostly with wood burned in a fireplace insert and, 
apart from some air circulation in under the fire box, up behind it and 
out over the top, most heating is radiant off of the top.

     For decades I have used a Swedish Christmas heat mill, sold for 
candles, which I adapted for stove top use, as a measure of heat release 
rate. In recent decades it turned less frequently and for several years 
not turned at all even with a brisk fire so I suspected wear and 
increased friction at pivot points.

     The stove top had become dull grey in color so to improve 
appearance I located a source of blacking last fall but it could be 
applied only to a cold stove so was applied to the top, on first recent 
warm morning this spring, and the increase in heat radiation from the 
top was dramatic. With just a token fire that Swedish heat mill was 
spinning full tilt !

     This I assume was a practical demonstration of increased radiation 
from a black surface (Black Body Radiation ?). And all along I had 
imagined that stove blacking was just for appearance.

Yt, DW, Kentville


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