Dialing in measurements and materials (I may have, after finally abandoning all hope, landed a local source of gray river clay
) and interesting in some barrel perspective...
I am casting an insulated core and heat riser. The latter being 14" at it's widest (filled with all sorts of insulation due to creating a 6" system) and rethinking the 50 gallon barrel. It's just HUGE, and the 32 gallon barrel really fits my space so much more naturally.
So the details and questions that arise are thus:
The 50 gallon barrel will yield a 4 1/2 in gap all the way around the heat riser.
The 32 (it might be 30, to me what matters are the measurements...) gallon barrel will yield a 2" gap around the heat riser.
I am running less than 20 feet of pipe in my bench, with three elbows going into a sound/solid/reliable chimney inside the living space, the first four straight feet of pipe is a highly insulated water heating element right after the plenum and first clean out then elbow. I am more interested in the heat getting to the water heater (in an open system, no BOOM+SQUISH here) and bench than the barrel, and know that insulating the barrel is a no-no...
What are the advantages, disadvantages, pros and cons of the barrel sizes for this system?
With my (rather busy winter) work schedule I am looking at only a couple of hours of burning about 14 hours apart.
I am willing to take the pains to make the smaller barrel fit uniformly over the heat riser if it will be enough cooling, pumping and pulling.
Thanks for having a look and weighing in! I'll be casting the core in a couple weeks and will soon be creating a thread to document the process. The latter only being fair, as I have learned so much from others doing so, and hoping to hear from the like!