seems like it would conduct heat further into your mass and more quickly. it will also restrict the flow through your flue, though. and you'll have to deal with the expansion and contraction of the copper, so it may not remain in contact with your thermal mass. might also crack the mass and allow gas to escape. probably worth experimenting with at the very least.
umm fins work but you ned to do them right. one trick i was sent was copper wire wrapping the pipe and the ends sticking out into the cob. seems to work good but its to soon to tell. Paul the foil idea probably wont work the way you outlined. but i look forward to hearing about it. I one time, would like pipe that has had fins welded on the outside length wise and use it on a bench.
one day when i have time to play with that.
Need more info?
Ernie and Erica
Wood burning stoves, Rocket Mass Heaters, DIY,
Stove plans, Boat plans, General permiculture information, Arts and crafts, Fire science, Find it at www.ernieanderica.info
One important point: don't allow aluminum and copper to touch, except temporaritly. The aluminum won't last if they get wet; the two will form a galvanic couple, and the aluminum will lose the tug-of-war.
The copper will help tremendously, if the theory is correct.
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.
I just had the craziest dream. This tiny ad was in it.
Switching from electric heat to a rocket mass heater reduces your carbon footprint as much as parking 7 cars