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6" Exhaust Pipes with 55-gallon Drum? Is this possible?  RSS feed

 
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Good day...

Ive done some measurements and the space available for my thermal bench wont allow me to use 8" pipes. It would end up being mostly pipes and little thermal mass so...

Can I use the same size combustion unit as for an 8" system plus the 55-gallon drum, but use 6" exhaust pipes instead of 8"? Or am I completely crazy..?
 
pollinator
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
59
books fungi hugelkultur solar wofati woodworking
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Karl Meisenbach : In One Word, YES ! You just need to re-figure the Cross Sectional Area, The C.S.A., Everything will be a little smaller and you will use less of every thing except Cob ! Don't get to far ahead of your self, have you a firm grasp on how you are going to burn out your barrel removing the paint on
the exterior at the same time ?

With using a 6'' pipe your C.S.A.s Will change, your Feed Tube opening should be 6''by 5'', with a C.S.A. of 30 sq. inches. The interior walls of your burn tunnel
will be 5''x6'' for a C.S.A. of 30 sq. inches, to transition to the full sized 6'' diameter Heat Riser with a C.S.A. of 28 sq. inches you will want a 5''x6'' exit with a C.S.A.again of 30 sq. inches, The very top of the Heat Riser should end 1.5'' to 2'' below the Inside of the top of the barrel, The outside wall of the Heat riser should end before touching the inside walls of the 55gal barrel leaving you a gap no smaller than 1.5'' all the way around !

The transitional area where the hot exhaust gases leave the bottom of the barrel should be very generous opening into a 10'' cavity above a generous ash pit,
here the gases take a wide sweeping 90 degree turn Flowing past walls as smooth as sheetrock, and funneling down into the 6'' horizontal pipe receiver of the
Thermal Mass.
 
Karl Meisenbach
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I couldnt find a similar post to elaborate on my issue.

Im just going to assume that with 6" piping I simply wont get sufficient draw. What if I used three 6" pipes that connect to the barrel, split up and then meet back at the other end of the bench before exiting the house? Would that work?
 
allen lumley
pollinator
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
59
books fungi hugelkultur solar wofati woodworking
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Karl M. : relax take a deep breath! 6'' rocket mass heaters are very common, There are lots of people here who will gladly walk you through the whole build and soon you will transition yourself from ''them that doing'' to ''the guy who has done it !'' Someone may tell you that you can have multiple exhausts but it is a very difficult build and where would you put the pipe ! For the Good of the Craft ! Big AL
 
Aaaaaand ... we're on the march. Stylin. Get with it tiny ad.
five days of natural building (wofati and cob) and rocket cooktop oct 8-12, 2018
https://permies.com/t/92034/permaculture-projects/days-natural-building-wofati-cob
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