Batch Box Rocket Mass Heater Build Original Design Mock up
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- เผยแพร่เมื่อ 18 ก.ย. 2024
- My Mock-up Dry Stack video before I start my build. I've had this idea in my head and it's time to put it into action. I'll be starting my build soon so if you have comments or suggestions please feel free to make them known
These build videos are great!
Thank You for letting me know that ☺️
First comment: use perlite-clay instead of perlite-Portland cement for the insulating base. The clay will eventually fire hard; Portland cement will break down at high temperatures.
I have some concern about the hard red brick for the firebox surround; it is more brittle than old soft red brick and cannot tolerate heat-cool cycles as well. I think I would start the firebrick lower in this situation.
Small holes need to be much larger in total than a single opening, as you get edge friction effects for each hole.
You don't need a special thimble to go from the first firebox surround to the rest of the bell, just a good sized opening or two at the bottom of the dividing wall.
You are making the bell considerably more involved than it needs to be. I understand supporting the roof slabs, but making effectively three secondary bells plus a collection chamber will mostly ensure that the part nearest the firebox will be significantly hotter than the other end. I would make one big open space inside the outer walls, with a cross wall for strength leaving large holes at top and bottom for free circulation. If you want more roof slab support, making pillars of brick where needed will add mass without increasing the overall size. The exhaust pipe running from the roof of the bell down to near the floor (known as a "plunger tube") is a good, standard idea. It may be helpful to make the bottom foot sliding so it can be raised or lowered for best performance. You want an access panel or hatch in the side so you can reach the exhaust for adjustment, and for inspection and cleanout generally. Even a short piece of 8" stovepipe with a cap will be good.