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Posted 23 May 2013You cannot (should not) change the size of the orifice of a venturi burner. As the gas goes through, it pulls the air through. If the orifice size is changed, the air to gas mixture gets all messed up. So you just buy whatever size (BTU) venturi you need. They are typically not as powerful as power burners, so you generally need more. Power burners can be made to just about any size (BTU), so they're greatest benefit is that you can usually just use two. Power burner kilns also don't need a tall stack/chimney, since you don't rely on secondary air (draft) to aid in the combustion.
Posted 23 May 2013Mixer blades work great, and they're faster than shakers. Mixers also do a better job, because they break up clumps with the shearing action of the blades. Shakers are not good for clumps. Mixers also scrape the bottom of the bucket to get all the settled stuff into the mix. They use shakers for paint because it allows them to mix with the can closed, so it's much cleaner. Imagine having to wash paint off a mixer every time you mixed a gallon...
Posted 22 May 2013Some companies make long, wide kilns, so you can get large volume without height. Oval or rectangular kilns give you the option of having decent volume without height. My L&L DaVinci is a top loading, 20 cubic foot kiln. It uses three 14x28 inch shelves per row. It's a standard 3 ring, 27 inch deep kiln. With only two rings it would still have more interior volume than a 27x27 round kiln (Skutt 1227 or L&L E28T), but be much easier to load. Plus rectangles make for more efficient use of interior space than circles.
Posted 22 May 2013
Posted 22 May 2013A 23x27 inch kiln with 3 inch brick will put out about 14,000 BTU's per hour of heat into the room at cone 6. That's like leaving two average size stove burners on full blast. At cone 04, about 11,000 BTU/Hr.
True, but you have to also take into account the (supposed) air turnover rate in that space given the existing ventilation on the BTU / hr. accumuilation in the space? And also minus the heat pump efect of the AC unit in BTU/ hr.
Agreed. Just wanted to give people an idea of how much heat comes off a kiln.