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Old February 19th, 2016, 03:24 PM
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Default Air Over Fire Help

I have most of my arch completed. I have an AOF/AUF arch with the 1/2 h.p. high pressure blower, and twenty 3/8" black pipe nozzles. Today, I decided to check my air pressure at the nozzle to see what I might be getting. I'm only getting 1 1/2" of water pressure. In order to measure the pressure, I slipped a 5/8" clear tube over the 3/8" black pipe, then created a "U" shape out of the clear tubing and put water in the tubing and let er fly. It pushed the water only 1 1/2". I followed the paper from UVM and Thunderbolt Research. Do I need smaller nozzles, does the amount of water column in the clear hose matter? Has anyone else tested their system? Should I not be concerned? Please help!
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Old February 19th, 2016, 07:05 PM
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What size is your evap? When did my aof, I used 3/16 and only in the back . 6 outlets. I think you are going to find that you are adding too much air and will be cooling the pans. The goal is small high pressure nozzles to create turbulence while adding additional combustion air.
But I could be completely wrong. Set some pans on it as fire it up.
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Old February 19th, 2016, 07:21 PM
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That thar is gonna be a lot of air. I imagine your pressure is low because of the total open area. If I guessed right you have more open nozzle area than the diameter of your tubing. One other observation, I'd tighten up those grates, you'll lose a lot of coals through those big gaps.
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Old February 20th, 2016, 07:15 PM
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Sapaholic:
My evaporator is 2x8.

Buckeye Gold:
I never gave a thought about having more area in my nozzles in total than the 2"x2" delivery tubing, even though that is what the UVM paper recommends as minimum. If my math is right, area of a circle is A=3.14 x radius squared. So, A=3.14 x (.1875 x .1875) = .11 square inches. Then if you take the .11 square inches x 20 nozzles = 2.2 square inches and my delivery tubing is 2" x 2" = 4" square. So I think there should be enough air.

I'm still scratching my head on this.
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Old February 20th, 2016, 07:34 PM
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It looks like your firebox is way too long for a 2x8. If I calculate right it must be more that 4" long (or deep if you prefer). My 3x8 Grimm has a 32" deep firebox (front to back) and then it ramps up to almost the bottom of the raised flue pan. You do not want four fire that far into the arch, unless you are making a 14-18' long evaporator.
As I say, my 3x8 has a 32" firebox and I cut my wood 21" long. When I fill it (every 9 minutes) I try to leave the first 4-6" as a space and a bed of coals seem to fill the area behind the new stack of 21" wood. You want your fire farther forward and then you have the space to get the heat to the pans before it goes up the stack.
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Old February 20th, 2016, 07:39 PM
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Lets get some boiling and firing pics uphere. Sap is running...
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Old February 20th, 2016, 09:39 PM
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You are right, I didn't do the math I was just guessing. Also I thought afterward, a high pressure blower will move more air too....my bad
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Old February 20th, 2016, 10:50 PM
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Too much nozzle area! As a test, try plugging nozzles until you get 4 to 6 in H20. You will probably need 1/4" nozzles and only about 16 of them. At least that is what works with my bounce house blower. I get 8" H20
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Old February 21st, 2016, 08:43 AM
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Default Nozzle reduction

You could reduce the overall size of the outlet which would decrease area and increase pressure. I have seen nozzles with threaded inserts. I experimented with welding stainless spout ends onto my nozzles, it did result in a narrower air stream.
Just some thoughts
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feychad (February 22nd, 2016)
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Old February 21st, 2016, 09:33 AM
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Nozzles are way too big
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