temps per size of systems

are there any numbers out there for burn chamber temps, in different sized rockets? say like an 8"ers top temps compared to 6 or 4" systems.

ronald bush : A good D.I.Y. Rocket Mass Heater R.M.H. will show traces of sintered bits of fly ash like little beads of glass in the burn tunnel and beyond indicating that
the Temperatures are around 1800dF or 1000dC, this is irregardless of the system size !

I can not recommend strongly enough, going to Rocketstoves.com to download a pdf copy of The brand new 3rd edition of Ianto Evan's Great Book 'Rocket Mass
Heaters

This will guarantee that when you come back here to Permies you will know and follow the Terms we use to describe the shapes, sizes, and orientations of each part,
and their orientation to each other ! It will also save you time money and frustration while trying to figure out unknowns alone and without help !

Think like Fire! Flow like a Gas ! Don't be the Marshmallow ! As always, your questions and comments are solicited and welcome ! Big AL !

allen lumley wrote:ronald bush : A good D.I.Y. Rocket Mass Heater R.M.H. will show traces of sintered bits of fly ash like little beads of glass in the burn tunnel and beyond indicating that
the Temperatures are around 1800dF or 1000dC, this is irregardless of the system size !

so you are saying it doesnt matter how big the system, they produce the same temp. hum, so more wood wont produce anymore heat?



trying to figure out unknowns alone and without help !

thats why im asking here sir.

!

thank you for your response Al

ronald bush : The higher the temperature you get a fuel to burn at, the closer it will come to its maximum efficiency ! Very quickly the Rocket Mass Heaters RMH's
owner will learn to dial in the correct fuel air mixture, by listening to the roar of the Combustion Air and 'spent exhaust gases !

Well seasoned wood still contains ~20%~ water, if we consider the idea of a piece of wood that has been held in a vacuum chamber for a long time we would
physically and obviously lighten our wood, under those conditions, a pound of wood contains 6930 BTUs of heat ! ( denser wood is heavier, BUT a pound of oak
will produce the same amount of BTUs/ Calories as a pound of soft pine !!!)

The Heat energy per pound is what we need to measure, The temperature we burn the wood at just determines what percent of unburned hydrocarbons -Creosote
we send up the chimney ! The Freakily high temps we burn wood at in a RMH means there never can be any production of Creosote after the First 10 min of burn !

Consider going to our sister site www.richsoil.com and click on the Rocket Mass Heater link on the left hand side of the 1st page, this will take you to a series of
short videos and information on the basics of RMH operation ! For the good of the Craft ! Big AL

thanks ill check out your suggestion. it still seems to me that 6 sticks burning would give off more heat than 4 sticks burning. but thats why i ask questions, to learn from those that know.

ronald bush ; Yes, definitely ! 6 sticks nestled one against the other will create a chimney-like condition helping to draw the air into the fire, and do so better than
4 sticks, and the thinner the wood is split the more surface area to mass and the easier it is to create the Dragons roar inside of Your Rocket Mass Heater RMH !

The amount of heat energy stored within the Wood is still what heats your House -not the temperature that the wood burns at, and not how fine you split it, the only
other important consideration is the correct volume of air feeding the fire, and even a total novice quickly learns how to find the sweet spot totally by ear !
For the Craft Big AL

ronald bush wrote:thanks ill check out your suggestion. it still seems to me that 6 sticks burning would give off more heat than 4 sticks burning. but thats why i ask questions, to learn from those that know.

Consider that it takes more air to burn 6 sticks than 4, and that the air has to be heated. Temperature produced will depend largely on air/fuel ratio, but BTUs are dependent on volume.

Are you looking for internal temperature or BTU output?

it still seems to me that 6 sticks burning would give off more heat than 4 sticks burning

Yes, they will create more BTU's of heat, but we thought your original question was whether they would burn at a higher temperature. This is a factor of the combustion temperature of wood, which doesn't change much depending on how much wood you are burning.

yes i was asking about internal temp not btu. thank you for the replys all.