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π΄πͺ% = οΏ½ π°πͺπ΄π΄π΄πΆπΆ πΎπ΄π΄πΎ πΎπ΄π΄πΆπΎπ΄ β ποΏ½ π πππ% [5] πΆπΆπ΄πͺπΎπ΄πΆ πΎπ΄π΄πΎ πΎπ΄π΄πΆπΎπ΄ 6) Once the MC is determined for each of the moisture sections, calculate the expected ovendry weight of your sample boards. I used a little algebra to rearrange the moisture content formula in Equation [5]. Hereβs an example: You cut two moisture sections from one sample board; moisture section #1 weighs 125 grams, and moisture section #2 weighs 163 grams. When they are dried, the weights are 80.5 grams and 104.2 grams. The calculated moisture contents are 55.2% and 56.5%, respectively, so the average MC of the moisture sections is 55.8%. You can use this value to estimate the ovendry weight of the larger sample board from which these pieces were cut. If the weight of the sample board is 3810 grams, the ovendry weight would be estimated from Equation [7] as follows: πΆπΆπ΄πͺπΎπ΄πΆ πΎπ΄π΄πΆπΎπ΄ π΄π π²π΄πΆπͺ πΊπΆπΊππΆπ΄ = ππππ πΆπ΄πΆπΊπ΄ = ππππ πΆπ΄πΆπΊπ΄ πΆπΆπ΄πͺπΎπ΄πΆ πΎπ΄π΄πΆπΎπ΄ π΄π πΊπΆπΊππΆπ΄ π©π΄πΆπ΄πΎ = πΆπ΄π΄πΆπ΄πͺπΆπΆ πΎπ΄π΄πΆπΎπ΄ π΄π πΊπΆπΊππΆπ΄ π©π΄πΆπ΄πΎ [π] οΏ½π + π¨πΆπ΄π΄πΆπΆπ΄ π΄πͺ% π΄π πΊπ΄π΄π΄π΄π΄π΄π΄ π΄π΄ππ΄π΄π΄πͺπ΄οΏ½ πππ This calculated ovendry weight should now be recorded - write it on the sample board itself with a permanent marker to be sure you donβt misplace it! As the wood dries, every subsequent weighing will use this calculated dry weight to estimate the current moisture content of the sample board without actually drying it out. For example, if at some point in your drying cycle this sample board weighed 3100 grams, you could use Equation [5] to calculate the current moisture content this way: 77 οΏ½π + ππ. ποΏ½ πππPDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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