/diy/ - Do It Yourself

>>2736310
most modern stoves are disigned like stoves 100 years ago, with a grate and primary air. newer ones have added sec and teritary air and some baffles to archive a afterburn.

but 100 years ago people would use antracite coal or coke, both are fuels you can throthle down the by starfing the air supply without getting big losses,
coke is almost pure carbon while wood also contains volatile compounds that burn to. but without enought air they leave the chimney unburnd and polute.

>>2468569
>>2468759
here a German diagram so in short.
>4kg of wood burn in 80min
>4kg of wood have 16kWh energy so average output of 12kw heat
>a medium wood stove has a output of 8kw.
the red is all the energy you loose through hot exhaust temperatures.

you could throttle the fire to 8kw by closing the air but that will lead to more soot more emissions and a less efficient burn.

>>1979276
>>1980661

Pic shown the energy output of a woodfire made with 4kg of wood. which contains 16kwh of energy.
when the wood is burned with enought oxygen in a complete combustion it burns in about 80minutes.

a typical cast iron stove is rated for 8kw and the stovepipe ads 1kW. but the wood releases up to 20kW at its peak.

this means you can either close the air of the stove and starve the fire of oxygen but then you get a incomplete combustion loose energy and polute the air.
or you overdrive the stove by 250% possibly damaging it, and youre room will get way to hot meanin you have to open a window, and you also loose energy because of high exhaust temperatures.

cast iron stoves got popular in the 1850 when people started using coal as fuel, coal can once it burns be adjusted by starving it of air without the problems wood has.

>>1920480
this diagram shows 8 pound of wood burning in 80 minutes after 40 min it would release 20kW.
a normal stove rated for 8kW would loose most of that energy thought the chimney. the room would overheat and the stove could be damaged ,so the operator would probably reduce the air supply and get an inefficient incomplete combustion.