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Effect of rectangular riser  RSS feed

 
Nori Lamphere
Posts: 31
Location: Onalaska, WA
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I'm having trouble coming up with an 8" well casing for my rmh.  I can pretty easily come up with 8x6 3/16" thick rectangular steel tubing.  Does the riser need to be either round or square?  Has anyone built a rectangular riser?  I need to know before I send Wadly off to round up something I ultimately can't use.
 
Ernie Wisner
gardener
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Location: Tonasket washington
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I replied via email you can post the reply if you wish.
 
Nori Lamphere
Posts: 31
Location: Onalaska, WA
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Ernie emailed me and said:

"The cross section won't bother it much no matter the shape. You will have to figure the cross sectional area and configure the burn tunnel, gap, and exhaust accordingly.

There may even be a benefit in the square ducting (I haven't tested it yet).  The torus will be affected and I don't know by how much or the variables that it will bring up.

Innovation is also lauded if it don't work as long as we get case studies. Most folks simply don't tell what went wrong or record why it went wrong.  Consequently we have to keep repeating the mistakes. A sad state of affairs to be sure.
"

I'm big on documenting what didn't work.  Trust me, when I test it and it tanks, you'll hear about it.

Remember we talked about inverting the center of the top of the tank?  With a rectangular riser I don't see inverting the curve as being a value added option unless I add a small rectangular pyramid in place of the round collar that currently tops the tank.  Thoughts?

I really need to test, test, test.  Like you, I'm stuck inside due to excessively crappy weather.  It can quit ANY time . . . the sooner the better.  I am not a duck or a sheep or anything else that shrugs off the weather.

The center aisle of the shop has a high enough roof that I could test in there.  There's no doors on the drive-in bay so I wouldn't be in danger of smoking myself to death.  Maybe I'll start testing in there once Wadly stocks me up on 8"x6" tubing.

Am I supposed to tell him to scrounge you a piece as well?

I did the calcs.  Of course my measurements aren't exact but will give a general feel for the difference.

An 8" circle has an area of 50.265.  A 8"x6" rectangle with 3/16" walls has an area of 42.89.  A 6" circle has an area of 28.27.

The 8"x6" fits nicely between and 8" system and a 6" system.
 
Ernie Wisner
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Location: Tonasket washington
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no thanks we dont need another project ATM. I dont think you will have much problem with the inverted end. i would go with what you have till you get some results at any rate.
 
Nori Lamphere
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Location: Onalaska, WA
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Not being a math genius . . . converting the inconsistent head-space between the top of the rectangular riser and the underside of the dome at the top of the radiating tank to some sort of comprehensible numbers is SO not going to be a breeze.  I'll have to get the best gap by testing, testing, testing or figure out a way to calculate the head-space.  Time to find a mathie to help.

If you change your mind and want a piece to stick aside for playing much later, let me know and I'll have Wadly grab you a chunk.

If I do go with the 8x6, do you want me to pass the 6" well casing on to you?
 
Ernie Wisner
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naa that water heater is going to be enough fun. 
 
Nori Lamphere
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Location: Onalaska, WA
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<LOL>  Okay.  I'll give you a heads-up when I head that way again.
 
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