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Final stages in dh kiln

1/15/19       
John Member

First off, I've gotten this far reading as much as I could find. Need a little help grasping a few things.

My first charge has been in the kiln for awhile. 10/4 red oak slabs. It is currently at 132 deg with wetbulb of 96. Plenty of air. I'm calculating an EDMC of 4.65 and rh of 26% and an absolute humidity of .02. Insulated pins in center of slab showing 15.5% and pins near surface at 6%. No water being collected in dh.

It's been stuck here for a few days. No additional reduction in moisture. Am I being impatient or am I missing something. If I'm shooting for 8% is it the core of 8% or the profile average at 8%. Thanks for any help getting me straight.

1/15/19       #2: Final stages in dh kiln ...
Gene Wengert-WoodDoc

Any chance you can increase the DB, but still keep 5% EMC? Heat will help the moisture move.

1/16/19       #3: Final stages in dh kiln ...
John Member

Thank you Dr. Wengert. I've been trying to follow the Nyle conservative schedule for Red Oak but can't get any more heat with my current setup. I assumed it would still work but Slower. Time to wire another circuit for another heater.

On the topic of knowing when it is finished and conditioning to final EMC, I looked to
William Simpsons USDA paper on EMC, and my target goal should be around 13% for my area in Wisconsin. I'm confused as to how to determine the final readings. Am I shooting for an average 13% between center of slab and surface? Thank you for your assistance.

1/16/19       #4: Final stages in dh kiln ...
John Member

Let me add to my perceived understanding on how this works and would look to be straightened out where I error.

EMC is important in the drying process as you want the EMC to be less than the surface moisture for moisture loss to occur. Controlling the difference between calculated Kiln EMC and surface moisture controls the speed which the wood drys.
EMC is important in post kiln wood as it is the point for your area were the wood neither takes on or loses moisture - stable. To this end, I'm thinking I need to shoot for a EMC value for my environmental conditions I want to use the wood in. 70deg house at 60rh would be 11% EMC.

I'm probably way overthinking this as all I want to do is dry slabs for sale but it's all part of the learning process.

1/19/19       #5: Final stages in dh kiln ...
Gene Wengert-WoodDoc

You seem to have a great understanding of the EMC of air as related to the MC of wood and how wood dries.

For outside, the AVERAGE EMC when protected from rain is 12 to 13% EMC. However, inside, the EMC is closer to 6% EMC in the winter unless your furnace has a dehumidifier, or you add moisture from cooking, house plants, bathroom showers without a good exhaust fan, etc.

1/19/19       #6: Final stages in dh kiln ...
Gene Wengert-WoodDoc

When I said "increase the heat," usually you only heat it for four hours and then back to responsible heat.


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