Win a copy of The Tourist Trail this week in the Writing forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • paul wheaton
stewards:
  • Joseph Lofthouse
  • Jocelyn Campbell
  • Mike Jay
garden masters:
  • Steve Thorn
  • Dave Burton
  • Joylynn Hardesty
gardeners:
  • Carla Burke
  • Pearl Sutton
  • Greg Martin

Dimensions for a 28" drum

 
Posts: 11
Location: Istanbul
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hello, I want to build a rocket mass heater at my workplace. I have a steel 28" diameter (1/2 inch thick) steel pipe and I want to use it as a drum.

I have been searching for what should be the dimensions of the system, but couldn't find a ratio.

I attached an section image of the important dimensions.

I'm waiting for your advices..

Thanks..
ROCKET.JPG
[Thumbnail for ROCKET.JPG]
section
 
Burak Unver
Posts: 11
Location: Istanbul
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This is the steel pipe I want to use as a drum attached below
drum.jpeg
[Thumbnail for drum.jpeg]
 
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Burak Unver wrote:Hello, I want to build a rocket mass heater at my workplace. I have a steel 28" diameter (1/2 inch thick) steel pipe and I want to use it as a drum.

I have been searching for what should be the dimensions of the system, but couldn't find a ratio.

I attached an section image of the important dimensions.

I'm waiting for your advices..

Thanks..



The height of the heat riser must be three times (at least)  the height of the feed tube where you load the wood.
The height of the heat riser must be two times (at least)  the length of the burn tunnel .
So if the height of the heat riser is 48 inches ,the height of the feed tube can not be more than 16inches and the length of the burn tunnel
cannot be more than 24 inches.

The gap from the top of the heat riser to the barrel rim is 5 cm/2 inches.  
The length of the feed tube opening and the heat riser opening should be the same as the height of the burn tunnel(the two courses of brick that you stack for the burn tunnel's height).
It would be good to purchase the Rocket Mass Heater Builder's Guide.
Regarding the gap of the manifold i would like to hear it from someone else in the forum.Are you going to use a 6 inch or an 8 inch system?

 
Burak Unver
Posts: 11
Location: Istanbul
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Panagiotis Panagiotou wrote:

Regarding the gap of the manifold i would like to hear it from someone else in the forum.Are you going to use a 6 inch or an 8 inch system?



Actually It depends on the items I scavenge I'll buy fire bricks for feed tube and burn tunnel.

I'm planning to use a steel pipe for the heat riser but didn't get it yet.

I have another question on my mind. What should be the thickness of the insulation layer? I'm asking this because If I make a thin insulation like 1.5 inches and we assume that the heat riser is 8" (8+1.5+1.5=11 inches for the riser and insulation)
The insie of my drum is 27 inches. (27-11)/2=8 inches of gap around the heat riser (B dimension in the first picture I post) 8 inches seems to much to me.. Should I make it even with the insulation layer? Does too thick insulation layer makes a negative effect on the system?

And can I use a mixture of broken glass , sand and pumice for the insulation?

Thanks..
ponza.jpeg
[Thumbnail for ponza.jpeg]
Pumice I'm planning to use
 
Mother Tree
Posts: 10994
Location: Portugal
1627
dog duck forest garden tiny house books wofati bike bee solar rocket stoves greening the desert
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Burak Unver wrote:I'm planning to use a steel pipe for the heat riser but didn't get it yet.



You might want to spend some time reading through this thread before you do get it - using metal in the burn tunnel and heat riser
 
Burak Unver
Posts: 11
Location: Istanbul
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Burra Maluca wrote:

You might want to spend some time reading through this thread before you do get it - using metal in the burn tunnel and heat riser



Hi, I read the whole article and totally convinced. But the thing is this, The place I want to build a RMH is a temporary workplace for me. It's a construction site and will last 2-3 years. After that we pack our stuff and settle another place

In the future when I move in to my own house, I'll definetaly build it with bricks..

I'm new to RMH and want to build one before the winter ends, because winters doesn't last long here in Istanbul. So I'm a litte eager to build one soon.

Thanks..
 
pollinator
Posts: 118
7
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
For insulation, Pumice would be the best choice of the three materials you mention.
 
Burak Unver
Posts: 11
Location: Istanbul
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

John Harrison wrote:For insulation, Pumice would be the best choice of the three materials you mention.



Do I need to crush them? Because the grains are like 1/2 or 1 inch size. I was thinking to fill gaps with sand.
 
John Harrison
pollinator
Posts: 118
7
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Don't fill the gaps with sand, it's the trapped air that provides most of the insulation.

You wan't a low mass substance with plenty of air pockets - pumice is ideal.
 
Burak Unver
Posts: 11
Location: Istanbul
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thank You John, I've noted that..
 
Panagiotis Panagiotou
Posts: 94
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Burak Unver wrote:

Panagiotis Panagiotou wrote:

Regarding the gap of the manifold i would like to hear it from someone else in the forum.Are you going to use a 6 inch or an 8 inch system?





I have another question on my mind. What should be the thickness of the insulation layer? I'm asking this because If I make a thin insulation like 1.5 inches and we assume that the heat riser is 8" (8+1.5+1.5=11 inches for the riser and insulation)
The insie of my drum is 27 inches. (27-11)/2=8 inches of gap around the heat riser (B dimension in the first picture I post) 8 inches seems to much to me.. Should I make it even with the insulation layer? Does too thick insulation layer makes a negative effect on the system?

Thanks..



Some lay two inches of clay-stabilized perlite around the heat riser that then they support around the riser with metal mesh or sheet metal etc.
Usually problems in the draft are being caused by a small  cross sectional area in the manifold.
 
Burak Unver
Posts: 11
Location: Istanbul
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
My drum is very thick 16mm (3/5 inches) Would it be a problem for emitting heat? Should I choose a thin barrel?
 
John Harrison
pollinator
Posts: 118
7
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It will take longer to heat up, but once up to temperature it will put out a lot of heat and stay warm for some time. A thinner barrel will heat up quickly but also cools down faster once the fire is out.
 
gardener
Posts: 2213
Location: latitude 47 N.W. montana zone 6A
275
cat pig rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I would vote for a thin barrel. You want that fast heat when you light a fire,  the mass is a better place to hold your heat.  Just my opinion, but that extra heat at the barrel could be uncomfortably hot on a not very cold Istanbul night.
 
get schwifty. tiny ad:
Heat your home with the twigs that naturally fall of the trees in your yard
http://woodheat.net
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!