Time drying wood heating

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dede2002
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Re: Heating wood drying time




by dede2002 » 25/02/20, 13:25

Adrien (ex-nico239) wrote:...
And is the sap / water difference a style or a real twist?


The sap is sweet, and therefore provides food for many organisms, insects or bacteria.
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Re: Heating wood drying time




by Christophe » 25/02/20, 13:49

Adrien (ex-nico239) wrote:And is the sap / water difference a style or a real twist?


Uh, not really a style twist: you don't know maple syrup or birch sap (birch water commercially)?
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Adrien (ex-nico239)
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Re: Heating wood drying time




by Adrien (ex-nico239) » 25/02/20, 14:43

Christophe wrote:
Adrien (ex-nico239) wrote:And is the sap / water difference a style or a real twist?


Uh, not really a style twist: you don't know maple syrup or birch sap (birch water commercially)?


We didn't understand each other Image

I was going back to the drying process.

Is it necessary to differentiate drying of the sap and drying of the water contained in the wood :?:
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Re: Heating wood drying time




by Ahmed » 25/02/20, 22:56

I don't know if that answers your question, Adrien, but there are two stages in the drying of wood: drying and drying proper. The first corresponds to the disappearance of the water present between the cells, while the second, which then intervenes, concerns the water contained in the cells. This distinction can have some interest in the case of lumber since by controlling the drying speed one avoids part of the deformations and especially the production of slots which devalues ​​the studs.
For firewood, this has absolutely no importance, since only speed can have an interest and slots are rather an advantage by allowing faster drying due to the increase in evaporation surfaces.
It is absurd to focus on an ideal and universal drying time, since it essentially depends on variable factors ...
A good way to have dry wood quickly is to store it in a basic greenhouse, with an air inlet at the base and a calibrated outlet in the upper part: no need for regulation and the operation accommodates this device approximate: the air heats up, loads with humidity and leaves at the top to be replaced by cooler and drier air ...
Another device also gives good results, but remains anecdotal in that it requires much more difficult conditions to meet: on a wall of the greenhouse an exchange surface is crossed by a stream of cold water (typically, stream mountain) and causes the water evaporated in the greenhouse air to condense; the condensates are then evacuated outside ...
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Re: Heating wood drying time




by Did67 » 26/02/20, 09:41

Yes, a greenhouse with draft is an excellent passive dryer, easier to build than those solid "wood shelters" (in masonry, tiled roofs before Eternit!) That there were in our country at the limit of agricultural sheds for the wood storage / drying ...

We always come back to the same thing: cover so that it does not get wet again; leave a draft to evacuate the extracted moisture ...

It is also the principle of industrial dryers, with hot air and forced draft in watertight boxes ...
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Re: Heating wood drying time




by Adrien (ex-nico239) » 26/02/20, 15:01

Ahmed wrote:I don't know if that answers your question, Adrien, but there are two stages in the drying of wood: drying and drying proper. The first corresponds to the disappearance of the water present between the cells, while the second, which then intervenes, concerns the water contained in the cells. This distinction can have some interest in the case of lumber since by controlling the drying speed one avoids part of the deformations and especially the production of slots which devalues ​​the studs.
For firewood, this has absolutely no importance, since only speed can have an interest and slots are rather an advantage by allowing faster drying due to the increase in evaporation surfaces.
It is absurd to focus on an ideal and universal drying time, since it essentially depends on variable factors ...
A good way to have dry wood quickly is to store it in a basic greenhouse, with an air inlet at the base and a calibrated outlet in the upper part: no need for regulation and the operation accommodates this device approximate: the air heats up, loads with humidity and leaves at the top to be replaced by cooler and drier air ...
Another device also gives good results, but remains anecdotal in that it requires much more difficult conditions to meet: on a wall of the greenhouse an exchange surface is crossed by a stream of cold water (typically, stream mountain) and causes the water evaporated in the greenhouse air to condense; the condensates are then evacuated outside ...


I had read this distinction between "the" waters ...

But I don't really understand the role or rather the "elimination" (or drying) mode of the sap in all of this

Then I wonder if the word drying does not have 2 meanings.
- drying as it is commonly understood, namely the drying of the water contained in the wood
- "drying" for a good use of wood, which implies for certain woods, like boxwood I think, that it is left in the water for months, drying implying that it is suitable for working .
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Re: Heating wood drying time




by Ahmed » 26/02/20, 16:43

The subject concerns firewood, exclusively. Afterwards, for other uses, as I mentioned, certain precautions must be taken ... In some cases, on the contrary, the wood is steamed to make it bendable or for slicing or peeling operations ( that produce veneer sheets) ...
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Re: Heating wood drying time




by Adrien (ex-nico239) » 26/02/20, 17:48

Absolutely but what about the sap and water contained in the wood at the drying level for firewood is the same or is it different?
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Re: Heating wood drying time




by sicetaitsimple » 26/02/20, 19:58

Adrien (ex-nico239) wrote:Absolutely but what about the sap and water contained in the wood at the drying level for firewood is the same or is it different?


Without being by far a specialist, I think you are referring to the techniques of "dessevage" (see your favorite search engine), in particular by immersion.
But it has (it seems?) Only interest for lumber. especially for the lazy!
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Re: Heating wood drying time




by GuyGadebois » 26/02/20, 20:21

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