Hi Fellas.. I'd like to resurrect this thread for opinions on stove vs pipe temp and what they imply or if they are really very valid at all..
Its just that there are SOOOO many variables that contribute to the spread between the stove and pipe.
Lets start with location. My pipe can be 200 degrees 12 inches from breech and 2 feet further up the pipe I can lay my hand on it. Then at the thimble its hardly luke warm. Then there is the location on the pipe itself. The top side of a horizontal pipe can be hot while the underside is much cooler. How does that work for a vertical pipe?
Then there is the burn rate issue. At lower burn rates I see a closer gap between stove and pipe. Is this because the top of the coal bed is cool and not producing radiant heat? At higher burn rates I see a more dramatic spread. Is this because the top of the coal bed is glowing and throwing massive amounts of radiant heat that the steel is absorbing?
And how about that secondary air? When I close my secondary air, the pipe cools.. Open secondary air and the pipe temp rises.. but, in both cases the stove temp stays the same.. Is this because more heated air MASS is running across the inside of the pipe surface by opening the secondaries?
And what about heat loss of the pipe itself? Last year I held my probe against the pipe with magnets. I could blow on it to cool it down. This year I secured the probe under a thin layer of insulation and blasted foil tape over it. Since the pipe isn't exposed where the probe is, it sees a higher temperature.
With all these variables and inconsistencies from one set up to the next, how can we justify any amount of efficiency based on these numbers?
Any comments are appreciated..