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About to go big  RSS feed

 
Rj Howell
Posts: 15
Location: New Hampshire, USA
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I need some help in constructing a proper rocket stove.
I have a 150 gallon tub I wish to heat



I have a container to construct from



I have a design of an exchanger



Now I need proper design sizing of pipes, inlet and draft and burn pot size to make this work.

can you help?

 
Rj Howell
Posts: 15
Location: New Hampshire, USA
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Truly hoping for some advise on this build. I've built a small one before, just to see if I could.
Now I'm hoping to build the Tub Heater.

Suggestions on pipe sizes and lengths, always have been curious if they should be the same size (diameter and length).

Is there a coloration of pipe sizing to wood sizing, as in larger pipe / larger wood?

Looking forward to some suggestions and direction.
 
allen lumley
pollinator
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
58
books fungi hugelkultur solar wofati woodworking
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Rj : Congratulations on your 1st build ! You have not definitively stated that you have 'The Book', please checkout the site in the link below.

http://www.rocketstoves.com

Buy the Book, rocket mass heaters, read the book! This is the best starting place, and virtually guarantees that when you return to this Forum
you are using the same words to describe the same parts, and their sizes, shapes, and orientation to themselves, each other, and the Whole .

Understanding how the sizes affect the hole is not just an interesting intellectual exercise, while the math you need is some thing you learned in or about
the 5th Grade (and you are smarter than a 5th grader, RIGHT!? ) Understanding where the ratios come from -Pipe diameter and length- is something
you should Know and be able to explain to your grandmother !

A final thought At Rocket Stoves dot com Leslie mentions You tube, in her own gentle way she is telling you that there is a lot of crap on U-Tube, and
anything you see there should be regarded with a great deal of suspicion !

Think like Fire! Flow like a Gas ! Don't be the Marshmallow ! For the good of the Crafts ! Big AL
 
Rj Howell
Posts: 15
Location: New Hampshire, USA
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The book is fairly generic when it comes to sizing.
Basic drafting principles are stated, but not math involved.
I get the basic's and this is not my first, just my first 'big' one.

I understand that this is still small to you all, but not to me.
I require 4k Btu's, in hopefully under 2 hrs.
Not certain if possible.
I have never gone this big..
Math and past experiments say possible..
Including thermal losses and transference of heat to the tub (though I'm known to screw up the math at times..)

In my smaller versions I have eliminated the tunnel.
Book speaks of keeping it as short as possible, but how do you all feel about not having it?

Keeping the feed tube smaller than the draft tube is basic drafting.
Has anyone come up any mathematical ratio's to improve efficiency?

Then comes the basic question...
Btu's achieved from a 6", 8", 10" riser

Then we go back to an original..
6" feed, use ?" rounds
8" feed, larger rounds??
Are you folks actually at using a couple 3-4" rounds vs. using many 1-2" rounds (or splits)?

 
Rj Howell
Posts: 15
Location: New Hampshire, USA
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believe I have answered my own question on the tunnel..
I see it as important, not as a tunnel, but as the size of the burn camber.
And believe I have solved this.

Since I'm going to pour this, I was hoping to discuss this and get it right.

Feed will be 3"
Draft tube will be 6"
Vent is still being debated (not in size, but in how)
What you folks are doing with down and Horizontal venting causes a value of restriction.
This could mean being slightly less than the draft tube area...
My vent will be adjustable (so I believe I can easily overcome this issue if true).
 
Rj Howell
Posts: 15
Location: New Hampshire, USA
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Now that I seem to be talking to myself here...
This may be the last post on my endeavor.

I've gone elsewhere and getting some good advise.

If anyone here ever wishes to see how this ends up.. PM me.
I'm willing to share.
 
Scott Strough
Posts: 299
Location: Oklahoma
21
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Rj Howell wrote:Now that I seem to be talking to myself here...
This may be the last post on my endeavor.

I've gone elsewhere and getting some good advise.

If anyone here ever wishes to see how this ends up.. PM me.
I'm willing to share.


Yes please, come back and share. I'd like to see the finished product myself.
 
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