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Definite answer bout metal heat riser?

Satamax Antone
volunteer

Joined: Sep 24, 2011
Posts: 891
Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
    
  13
Hi everybody.

Well, will a 5mm thick gaz container, burn, melt, disapear, or whatever if used as a heat riser? I can't make up my mind as if the answer is yes or no.

Thanks.

Max.


God of procrastination (Pratchett's style) )
Ernie Wisner
volunteer

Joined: Oct 16, 2009
Posts: 788
Location: Tonasket washington
    
  23
yes it will work for a time. No i dont recommend it for stoves that are expected to last more than 5 to 10 years.


Need more info?
Ernie and Erica
Wood burning stoves, Rocket Mass Heaters, DIY,
Stove plans, Boat plans, General permiculture information, Arts and crafts, Fire science, Find it at www.ernieanderica.info


Roy Clarke


Joined: Feb 05, 2012
Posts: 121
For long life, is cardboard former, refractory material, then insulated with pearlite in a metal jacket a satisfactory construction?
Ernie Wisner
volunteer

Joined: Oct 16, 2009
Posts: 788
Location: Tonasket washington
    
  23
brick would be good its cheaper to.
Aurora Hess


Joined: Feb 25, 2012
Posts: 6

Hi Guys,
Great design - (which we are going to use to for a 'large survival camp')
a question about the side flue.
Is there a cutoff of point (of measurement), where it would stop working (or prevent a draft happening/or too much draft maybe)

We are wanting the flue to go 18 metres for the heating potential - (to the outside of the living area)

Thankyou for your time in answering this.

Cheers
Aurora

Aurora Hess


Joined: Feb 25, 2012
Posts: 6

apologies, i should have started a new topic methinks.

sorry
Ernie Wisner
volunteer

Joined: Oct 16, 2009
Posts: 788
Location: Tonasket washington
    
  23
that depends on lots of factors. Elaborate please.
Aurora Hess


Joined: Feb 25, 2012
Posts: 6

We are looking at a large area
44 metres x 36 metres

with two rocket stoves (144 gal drum design w/cast core - and side flue)

1 with the flue going to the right
1 with the flue going to the left


one 1/3 from the top end
and the other 1/3 from the bottom end)
both positioned down the centre of the area

Ernie Wisner
volunteer

Joined: Oct 16, 2009
Posts: 788
Location: Tonasket washington
    
  23
you will want 8 inch systems, I dont know what you mean by cast core, and you are talking a max linear length of 50 feet of ducting (by then the exhaust will basically spill out of the duct so dig a ditch your gonna need it.) I would either go dead level or with a slight decline to the end. the steam is going to be pretty heavy so not asking it to rise would be good. if you plan on any turns then your looking at computing 5 feet per 180 degrees. IE a ninty degree would be 2'1/2" of length subtracted Etc.
Aurora Hess


Joined: Feb 25, 2012
Posts: 6

Thanks Ernie, i have passed on those instructions for the flue,
especially the ditch!

(my mistake about the cast core (thats what it looked like to me).

thanks again
Aurora
 
 
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