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Author Topic: Fans on syp question  (Read 768 times)

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Offline btulloh

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Fans on syp question
« on: July 01, 2018, 09:31:12 PM »
I'm going to put a load of fresh sawn syp in the solar kiln in the morning and run the fans on it for a few days with the doors open. Should fans run 24 hrs a day or daytime only?  I also have the ability to schedule the fans for intermittent operation on any schedule I want.  Any input is welcome.  Thanks.

To clarify my question: if you're running fans on a stack of syp in your drying shed, do you run them 24 hours a day?
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Offline GeneWengert-WoodDoc

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Re: Fans on syp question
« Reply #1 on: July 01, 2018, 10:26:36 PM »
It is best to run the fans when the RH is under 90% RH...maybe even 85%RH as the Wood gets drier.  The humidity outside at night and also in the kiln at night will come close to  100% RH, so running the fans at night does not help drying.  Maybe you will turn fans on around 8AM and off about 9 PM in the summer.

Your approach of using the kiln as a fan dryer the first few days is great.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline YellowHammer

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Re: Fans on syp question
« Reply #2 on: July 01, 2018, 11:09:30 PM »
Although drying is reduced at night, as relative humidities go high, yes I run my fans on drying stacks 24/7 for pine.  
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Offline btulloh

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Re: Fans on syp question
« Reply #3 on: July 02, 2018, 07:04:09 AM »
Good info.  Thanks.

Trying to avoid the green mold.  High temps and rh for then next few days.  Or weeks.  Or months.
HM126

Offline WDH

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Re: Fans on syp question
« Reply #4 on: July 02, 2018, 07:23:56 AM »
Like Yellowhammer, I run my air drying fans 24/7 as well.  It is easier for me to just let them run.  Right now I have fans on maple, pine, and pecan.
Woodmizer LT40HDD35, John Deere 2155, Kubota M5640SU, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

Offline btulloh

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Re: Fans on syp question
« Reply #5 on: July 02, 2018, 12:46:11 PM »
Loaded up with a short load.  Started picking up just a little mold overnight (before it went into the kiln), plus this was from logs that I let sit around a little too long.  





What you see on the edge is some blue stain from letting the logs sit before I sawed them.
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Offline WDH

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Re: Fans on syp question
« Reply #6 on: July 02, 2018, 08:22:30 PM »
Very well prepared load.

You do quality work, Sir.....
Woodmizer LT40HDD35, John Deere 2155, Kubota M5640SU, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

Offline Lawg Dawg

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Re: Fans on syp question
« Reply #7 on: July 30, 2018, 03:41:38 PM »
Intrested to know how this load turned out for you! :P
2018  LT 40 Wide 999cc
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Offline btulloh

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Re: Fans on syp question
« Reply #8 on: July 30, 2018, 04:32:34 PM »
It turned out ok.  I went a little too low on the mc when I ran the temp up at the end to sterilize, but still ok.

The rest of the tale went into this other thread:

SYP kiln drying dilemma - (question for the experts) in Drying and Processing

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Offline btulloh

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Re: Fans on syp question
« Reply #9 on: July 30, 2018, 05:26:43 PM »
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