[Stoves] Heat / cook stove - proposed design

[Darren Hill]

Hello Stoveites

     I'm going to start construction of this soon..... (Original post below)

     Any last guidance would be appreciated, or do people think its 
looking reasonable?

Best

Darren

On 11/01/2011 10:44, Darren Hill wrote:
> Attached is a picture of my latest design/idea.
>
> Thanks to all those who have given their input.  Most useful and much 
> appreciated.
>
> The stove will be lit by building a top lit up draft fire in the twin 
> walled 'combustion chamber' part of the stove (B).  Secondary air 
> flows (and possibly primary?) in through these twin walls so that it 
> is warmed before it enters the stove. Valves are fitted to regulate 
> both primary and secondary airflow.  Much of the twin walled area is 
> filled with rock wool to insulate the combustion chamber.
> The fuel hopper (A) will be pre filled ready to take heat (and begin 
> ignition) from the fire started in B.
> The gas flows up from the fire and through the 'Bleed Hole' (3cmx3cm) 
> into the insulated chimney pipe where the heat increases the draught.  
> As the fire starts to catch the bleed hole becomes insufficient for 
> all the gases to pass into the chimney so much of it instead flows 
> down past the heat exchanger.
>
> The bottom of A will be a grate to let the ash fall down into an 
> airtight ash pan.
> The bottom of B will be sloped (more steeply than shown) so that ash 
> from the initial lighting falls back through the throat into the ash pan.
>
> I'm thinking that the throat wants to be at least 10x10 and positioned 
> in the middle of the wall between A and B
>
> The doors into A and B will both have small windows to view the burn.  
> Air will be jetted over them to keep them clean.
>
> Is a cooking hatch necessary?  Does it provide much more cooking 
> efficiency?  (if included maybe just have window into B without door)
>
> I'm actually planning on having an L shaped stove (looking from above) 
> Part A (20cmx30cm) will be alongside B (20cmx20cm).
>
> The whole of the back of the stove will be 20x10
> I guess it will improve draught to insulate the part of the stove 
> below the chimney stack. (except where the heat exchanger is positioned)
>
> Height from bottom of throat to top of stove 60cm.
>
> Chimney 9cm diameter insulated - how long from top of stove??? Would 
> two 45' bends (to kick the chimney across about 30cm) make much 
> difference to the draught?
>
> I'm going to design the air inlet(s?) so a fan(s) can be added if 
> necessary.
>
> Do I need to make special considerations for the throat to stop the 
> metal burning away?  Use other material (fire brick?), thicker metal?
>
>
>
>
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