[Stoves] Heat / cook stove - proposed design
Darren Hill
mail at vegburner.co.uk
Tue Jan 11 04:44:24 CST 2011
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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