I am running a hand fed furnace which functions quite closely to a hand fed stove so I thought this topic would fit well here. At the start of a new fire, my temperature difference between the flue pipe and furnace will run a difference of 50-60 degrees.. For example, the pipe will be around 150 and the furnace above the load door will be around 205.. What I find really interesting is that as I get a few days into a new fire, with all other variables being consistent (outside temp, draft pressure, indoor temp, primary and secondary combustion air ratio) my difference between the flue pipe and furnace will grow.. In the picture you see the furnace temp at 257 and the pipe temp at 162.. This is approaching a 100 degree difference.. and after even more time, the difference will go over 100 degrees..
My deduction on this is that after several days of starting a new fire, ash settles into all the nooks and crannies where primary combustion air was bypassing the coal bed, such as between gaps in firebricks and around grate frames. After this settling of ash, the primary air is forced to burn more efficiently.
Anyone have thought or comments?
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