• 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 skip experiences global resources cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Anne Miller
  • Nicole Alderman
  • r ranson
  • Pearl Sutton
  • Mike Haasl
  • paul wheaton
stewards:
  • Joylynn Hardesty
  • Dave Burton
  • Joseph Lofthouse
master gardeners:
  • jordan barton
  • Greg Martin
gardeners:
  • Carla Burke
  • Ash Jackson
  • Kate Downham

Self feeding rocket stove to heat a radiator

 
Posts: 4
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I am looking for a design for a self feeding rocket stove which will installed outside under a cover to protect it from rain.

I would like to be able to heat water, preferably using a tank rather than a coil of copper pipe as I have a 10 and 20 litre tank, which will be used to heat a radiator in a small workshop, I have a 12 volt pump that can be used so the water doesn't boil.

Is there a formula for the length of the flue, burn chamber and the feed tube, I have a length of 6 inch box section, about 6ft long (2 meters) and a 4 inch diameter tubing for the flue pipe which is about 5ft in length.

Any help anyone can give me would be greatly appreciated
 
Posts: 60
Location: Somerset England
15
rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Ian Uk wrote:I am looking for a design for a self feeding rocket stove which will installed outside under a cover to protect it from rain.


Self feeding, once started you could use a pellet style feeder?


I would like to be able to heat water, preferably using a tank rather than a coil of copper pipe as I have a 10 and 20 litre tank, which will be used to heat a radiator in a small workshop, I have a 12 volt pump that can be used so the water doesn't boil.

Devils advocate, why not having the rocket stove inside to warm the workshop?

Is there a formula for the length of the flue, burn chamber and the feed tube, I have a length of 6 inch box section, about 6ft long (2 meters) and a 4 inch diameter tubing for the flue pipe which is about 5ft in length.

Box section will not produce the temps required for a totally clean burn and the steel will start to spall in time wrecking your rocket stove....

Where in the uk are you?

You can cast a burn box from sodium silicate, fine clean sand and stove cement, same stuff used to make forged linings, or if chemicals dont tickle your fancy, use good fire bricks.

Ceramic fiber for the riser (where the really hot bit happens)

200l tank over that, assuming you make an 8inch stove.

You need to balance the system, so 8 inch intake 8inch exhaust

I'm sure someone more qualified will be along soon, have you bought the rocket stove book?

Any help anyone can give me would be greatly appreciated

 
Ian Uk
Posts: 4
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Toby Winston wrote:

Ian Uk wrote:I am looking for a design for a self feeding rocket stove which will installed outside under a cover to protect it from rain.


Self feeding, once started you could use a pellet style feeder?


I would like to be able to heat water, preferably using a tank rather than a coil of copper pipe as I have a 10 and 20 litre tank, which will be used to heat a radiator in a small workshop, I have a 12 volt pump that can be used so the water doesn't boil.

Devils advocate, why not having the rocket stove inside to warm the workshop?

Is there a formula for the length of the flue, burn chamber and the feed tube, I have a length of 6 inch box section, about 6ft long (2 meters) and a 4 inch diameter tubing for the flue pipe which is about 5ft in length.

Box section will not produce the temps required for a totally clean burn and the steel will start to spall in time wrecking your rocket stove....

Where in the uk are you?

You can cast a burn box from sodium silicate, fine clean sand and stove cement, same stuff used to make forged linings, or if chemicals dont tickle your fancy, use good fire bricks.

Ceramic fiber for the riser (where the really hot bit happens)

200l tank over that, assuming you make an 8inch stove.

You need to balance the system, so 8 inch intake 8inch exhaust

I'm sure someone more qualified will be along soon, have you bought the rocket stove book?

Any help anyone can give me would be greatly appreciated




In reply to your questions Toby,

Thank you for the information Toby

The reason I am not putting the stove inside is due to the size of my workshop/man cave, the total size is only 3.6 meters by 2 meters, which has been split into 2, 1 half is going to house amatuer radio equipment, this end is insulated with loft insulation and silver lined insulation and is the area I would like to keep warm the most, the other half will be used for storage for fishing equipment on one side and the other side will have a work bench.

I am based in North Buckinghamshire about 50 miles from London

Thank you for the information on the sodium silicate, fine clean sand and stove cement, I will look into the costs of that

200L does seem on the large size for 1 small radiator of around 500 by 400

What Rocket stove book is that?
 
gardener
Posts: 1298
Location: Westbridge, BC, Canada
343
building solar woodworking rocket stoves wood heat greening the desert
  • Likes 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hello Ian,   Welcome to the rocket mass heaters forum.  

When you mean self feeding, do you mean with pellets? ....as the traditional J tube RMH is automatically self feeding (until the length of the wood is used up).

Here are a few builds that may not be exactly what your looking for but may help you get some ideas on water heaters that are made safe and have been proven to work.

Rocket stove water heater repair

rocket water heater and shower

The generally accepted formula for a J tube is 1:2:4 - Feed : burn tunnel : heat riser. These numbers have some leeway according to your build.
All of the cross sectional area needs to be keep the same, so if your building a 6" system, all the channels from feed to exhaust need to be kept the same (28 sq inches) except for the manifold. Again, there is some leeway with these numbers, but best the stick as close as possible to them.  

One of the original bibles for building a RMH is: Rocket Mass Heaters - Superefficient Woodstoves YOU Can Build by Ianto Evans and Leslie Jackson
The more recent one which is much more technical and in depth is:
Rocket-Mass-Heater-Builder-Guide by Erica and Ernie Wisner
....both are excellent in their own way.



gift
 
Unofficial Companion Guide to the Rocket Oven DVD
will be released to subscribers in: soon!
reply
    Bookmark Topic Watch Topic
  • New Topic