Konstantin Kirsch wrote:How do you like the idea of cooling the feed tube?
I see at my place it's worth to try.
Peter Berg wrote:... at last I've used the secundairy air supply to cool the tube. See this link.
Dale Hodgins wrote:How long has it been in use?
Dale Hodgins wrote:Do you have an estimate of the total weight of masonry materials, metal and water?
Dale Hodgins wrote:Did you consider using aluminum for the metal insert that cools the feed area?
Dale Hodgins wrote:I see that the building is quite unique with curved walls. Could you take a few photos from further back, and from a few different locations, so that we can see the RMH in the context of the rest of the building?
Dale Hodgins wrote:What is your regular job ? Your masonry skills are far superior to mine and to those of most people.
Dale Hodgins wrote:I'm moving this to the top of the flagged topics list.
Konstantin Kirsch wrote:Hi Dale,
To compare steel and silver the thermal conductibility is about 10 times better, but the price for silver? Too much!
Copper is nearly as good as silver but its much cheaper.
The next interesting material is aluminium. Its not so good as copper, but extrem better than steel. And the good thing is: Its cheaper than copper.
So my thought is: Copper or aluminium is the material you should use if you want to build a feed-tube cooling system.
My experiments show that the water pot in the pictures is too small. Instead of 3 liters I recommend 5 to 10 liters to keep the cooling effect working well.
Or be prepared to use the hot water for something and replace it with fresh cold water.
Heat pipes are thermal superconductors, due to the very high heat transfer coefficients for boiling and condensation. The effective thermal conductivity varies with heat pipe length, and can approach 100,000 W/m K for long heat pipes, in comparison with approximately 400 W/m K for copper.
Glenn Herbert wrote:I would guess that you had stronger draft originally, which pulled so much fresh air through that it cooled the feed area, and moved the exhaust through the system quickly enough that it didn't have time to give up most of its heat to the barrel and early duct run.