what wood has most btu value

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    Five Best Burning Species

    Hickory - 25 to 28 million BTUs/cord - density 37 to 58 lbs./cu.ft.
    Oak - 24 to 28 million BTUs/cord - density 37 to 58 lbs./cu.ft.
    Black Locust - 27 million BTUs/cord - density 43 lbs./cu.ft.
    Beech - 24 to 27 million BTUs/cord - density 32 to 56 lbs./cu.ft.
    White Ash - 24 million BTUs/cord - density 43 lbs./cu.ft.

    Those figures of course are based upon dried wood, "not green"!  The green wood may burn, but not efficiently, as it wastes heat boiling off the moisture content of it.  Most wood takes about 6 mo. plus to sufficiently air dry to get it into the category of seasoned, or dried.  This differs with the environment as high humidity slows, and very low humidity speeds it up a bit. 

    British thermal unit(abbr.: Btu, BTU )
    the amount of heat needed to raise one pound of water at maximum density through one degree Fahrenheit, equivalent to 1.055 × 103 joules.

    bomb calorimeter
    a thick-walled steel container used to determine the energy contained in a substance by measuring the heat generated during its combustion.

    calorie |?kal(?)r?|(abbr.: cal. )noun ( pl. calories )either of two units of heat energy.• (also small calorie )( )the energy needed to raisethe temperature of 1 gram of water through 1 °C (nowusually defined as 4.1868 joules).• (also large calorie )(abbr.Cal )the energy needed to raisethe temperature of 1 kilogram of water through 1 °C, equal to one thousand small calories and often used to measurethe energy value of foods.ORIGIN mid 19th cent.: from French, from Latin calor heatFrench suffix -ie (see -y3.

    1 calorie =
    0.00396566683 btu

    These two methods measure heat produced by burning something to an ash.  They are considered scientific methods for use in science and technology. However, the measure of heat produced may be useful, the efficiency of your stove in transferring that heat to where you want it  and keep that heat there is far more important than the volume of wood that may be called for. Your fuel requirments can be drastically cut by attending to insulation, an outside air-way to draw air to keep your fire lit, intake air pre-heating and chambering exhaust air to remove the remaining heat from the exhaust… all are important issues to consider more than heat energy.   

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