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Author Topic: Finally got my hobby lumber dryer going  (Read 977 times)

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Offline farmfromkansas

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Re: Finally got my hobby lumber dryer going
« Reply #20 on: September 15, 2019, 09:26:53 AM »
I put hoses on the dehumidifiers, so can not say how many gallons of water are being removed.  These cool nights have been helping, as the hoses are dripping in the morning when I check them.  Need to count layers to estimate board feet.  Good pile though.  Yesterday one of the air hoses came off between collectors and reefer, so did not get as much heat as usual. Took the leaf blower and blew between layers, and blew the dust out of the trailer, should have taken a board out to check.  My meter is a mini ligno. 

Offline farmfromkansas

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Re: Finally got my hobby lumber dryer going
« Reply #21 on: September 15, 2019, 10:08:33 AM »
Went and checked the dryer just now, the temp inside was 94, one dehumidifier was doing nothing and the other was dripping a little, opened the door and went inside, both dehumidifiers don't seem to want to go below 35%, took out one board at the back, and one from the front, cut about 4" off the ends of both, one mullberry, the other walnut, and the mullberry tested 6 to 7%, the tester just changed without moving it, and the walnut tested 8 to 9%.  So getting there.

Offline doc henderson

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Re: Finally got my hobby lumber dryer going
« Reply #22 on: September 15, 2019, 10:53:11 AM »
home dehumidifiers are only designed to go to 35%.  under that in a home and things start cracking and lots of static, (not just from the wife).  low humidity in the air keeps the surface dry, but it is the high temps in the day that move the inside water.  you can do and oven dry test if you have a tiny scale like for 500 g ect.  I had one from our pinewood derby days.  I did a pre moisture on some firewood so I can see if a temp. solar kiln speeds things up.  you only need a 1" cross section from the boards you cut.  pre- weight, then dry until they stop loosing weight at a about 217.  takes a day in a regular oven.  or faster in the microwave but more monitoring.  and or I use a wagner but its upper limit is 32%.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.

Offline doc henderson

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Re: Finally got my hobby lumber dryer going
« Reply #23 on: September 15, 2019, 11:09:21 AM »
 

 

side and center split from mulberry log



 



 

dry at 217 aprox.



 
 

I did 3 from the center and three from the outside with sap wood, cut them to 1 inch think aprox.  got a weight and kept checking weight until no further losses in the oven.
subtracted the final from the original weight to get the weight of the water lost.  divided the water weight by the dry weight to get MC.  the inside was 34% the outer split was 41%.  by oven dry method.
 

timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.

Offline doc henderson

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Re: Finally got my hobby lumber dryer going
« Reply #24 on: September 15, 2019, 11:27:17 AM »
in my container I run the hose into a 5 gallon bucket (outside and lower than the connection to the dehumidifier) so can check and dump.  upwards of 5 gallons a day when wet.  yes most water at night. lower temp, higher humidity.  in a kiln with wet wood we may keep the humidity at 85% so it does not get as much gradient between the center and surface. (called wet bulb depression) bigger diff between dry bulb (temp) and wet bulb is lower relative humidity.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.

Offline doc henderson

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Re: Finally got my hobby lumber dryer going
« Reply #25 on: September 15, 2019, 04:59:51 PM »
what a gent.  @beenthere pointed out (by PM) that the water weight is divided by the dry weight.  that is sure correct.  I know that in theory the MC can be greater than 100% in cottonwood and such, and that would never be poss if the denominator was the largest weight.  so take the total minus the dry weight is the water weight that was baked off.  divide that number by the final dry weight for the MC.  as to not cause future confusion, I did modify my prev. post.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.

Offline farmfromkansas

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Re: Finally got my hobby lumber dryer going
« Reply #26 on: September 16, 2019, 07:42:45 PM »
This morning the temp in the dryer was 106.  Both dehumidifiers were running, could hear them humming from outside, and put my hand under both corners, and the ground was wet, and a few drips coming from hoses.  Don't catch the water, just run it out.  No scale other than the bathroom scale to weigh myself, but looks like the dryer is getting there.  Funny thing, this afternoon about 3:00 checked temp in the dryer, and was about 119, and checked about 5:30 before coming home, and it was back to 115.  So the sun works better earlier in the day, and although the fans keep running, the temp drops towards evening.  These dehumidifiers seem to work at higher temperature than some, but would be nice if they would go below 35%.

Offline doc henderson

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Re: Finally got my hobby lumber dryer going
« Reply #27 on: September 16, 2019, 10:45:31 PM »
@farmfromkansas I think early you want the heat, more than lower humidity.  at 35% it will eventually reach 7% just like in your house.  the heat speeds it up, @ 35% but 70 it will get to the same MC, but take longer just like putting it in your house.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.

Offline farmfromkansas

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Re: Finally got my hobby lumber dryer going
« Reply #28 on: September 18, 2019, 02:11:23 PM »
This load will probably be done in a couple weeks, and I am wondering am I going to have to buy another container?  Have a couple more stacks that need drying, but after that, what do you do with this thing, just unhook the collectors, turn the electricity off and use it for wood storage?

Offline doc henderson

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Re: Finally got my hobby lumber dryer going
« Reply #29 on: September 19, 2019, 04:00:31 AM »
yes but keep a dehumidifier going in there to keep it about 35% like your house.
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.

Offline farmfromkansas

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Re: Finally got my hobby lumbeoor dryer going
« Reply #30 on: September 19, 2019, 09:30:59 AM »
Thanks Doc.


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