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Green wood

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Title: Green wood  
Author: World Heritage Encyclopedia
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Subject: Kiln, Slab hut, Wood drying, N ray, Glossary of woodworking
Collection: Fuels, Timber Seasoning
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Green wood

Green on left,Seasoned on right

EDIT: "Green wood" in regard to firewood is wood from a deciduous tree that was felled when the tree still had its foliage. In the colder months when trees shed their leaves they also draw the sap away from the limbs and into the trunk. When properly seasoned, firewood cut from these trees burns longer and hotter than wood from trees that are cut when they still had leaves. The term "green wood" has been generalized to describe freshly cut wood which does not burn well. Freshly cut wood is just that, fresh or wet wood. [1]

Green wood is wood that has been recently cut and therefore has not had an opportunity to "season" (dry) by evaporation of the internal moisture. Green wood has a high moisture content relative to seasoned wood, which has been dried through seasonal passage of time or forced wood drying (as in kilns). Green wood is considered to be 100% moisture content relative to air dried or seasoned wood which is considered to be 20%. Available BTU charts for wood fuels tend to use air dried as their reference, thus oven dried or 0% moisture content can reflect 103.4% BTU content, exceeding the mean value. When green wood is used as fuel in appliances, it releases less heat per unit of measure (usually cords[2] or tons) because of the heat consumed to evaporate the moisture.[3] The lower temperatures that result can lead to more creosote being created which is later deposited in exhaust flues. These deposits can later be ignited when sufficient heat and oxygen are present to cause a chimney fire which can be destructive and dangerous.

'Green lumber' presents its own characteristics as well. Some species of wood are better used green because wood splits less when nailed green. Others tend to shrink excessively leaving voids between the individual pieces when allowed to dry. Often wood to be used for fine products such as furniture is 'kiln dried' to stabilize it and reduce the shrinkage/expansion of the finished product.

References

  1. ^ John McPhee
  2. ^ [1]
  3. ^ NH Forest Market Report 1988, page 22
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