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Author Topic: HELP !! Initial Kiln Temp vs RH for DH4000 (Nyle L200)  (Read 1615 times)

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Offline DR_Buck

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HELP !! Initial Kiln Temp vs RH for DH4000 (Nyle L200)
« on: August 06, 2007, 04:36:56 PM »
I am using a DH4000 with Temp and RH displays.

If my drying schedule calls for a starting temperature of 90° and a relative humidity of 80% and the outside air temperature is 98°, how can I get the RH up to 80% if the over-temperature vents keep kicking in to control the top temperature to 90°?   

Do I need to raise the starting temperature and RH above the recommended starting points?   Looking at the drying rate index (DRI) in the Nyle manual it shows that I'm starting at a 0.2 DRI.   Do I just use the chart to find combination of a higher temp that is above ambient air and a RH that produces the same 0.2 DRI ?   According to the chart the next 0.2 DRI above my ambient air is 105° and 93% RH

My lumber going in is an average of 30% MC
Been there, done that.   Never got caught [/b]
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Offline Don_Lewis

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Re: HELP !! Initial Kiln Temp vs RH for DH4000 (Nyle L200)
« Reply #1 on: August 06, 2007, 06:20:50 PM »
Set the temperature at 10F higher that the highest outdoor temperature and use the ssme humidity setting

Offline David Freed

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Re: HELP !! Initial Kiln Temp vs RH for DH4000 (Nyle L200)
« Reply #2 on: October 21, 2007, 10:10:00 PM »
   When the outside temp is that warm I just keep air drying. Depending on the type of lumber I either leave it out of the kiln or put it in with one or more fans running to speed up the air drying.    David

Offline scsmith42

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Re: HELP !! Initial Kiln Temp vs RH for DH4000 (Nyle L200)
« Reply #3 on: October 21, 2007, 11:24:09 PM »
I'll do what Don suggests and watch my daily drying rate.  If the MC%'s on the test boards start dropping too quickly, I'll crank the RH% to a higher level to bring it back within spec.

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