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π΄π΄π΄π΄π΄π΄π΄π΄πͺπ΄πͺπ΄π΄πͺπ΄= (πΆπ΄π΄πΆπ΄πͺπΆπΆπΎπ΄π΄πΎπΎπ΄π΄πΆπΎπ΄βπΆπΆπ΄πͺπΎπ΄πΆπΎπ΄π΄πΎπΎπ΄π΄πΆπΎπ΄) ππππ% [3] πΆπΆπ΄πͺπΎπ΄πΆ πΎπ΄π΄πΎ πΎπ΄π΄πΆπΎπ΄ ο Use Equation [3] to calculate lumber moisture content. Using the same example as above, a person in the solid wood industry would calculate the moisture content as ππππππππ πΆππΆπππΆπ = (10 ππππππ β 5 ππππππ) π₯ 100% = 100%. [4] 5 ππππππ If youβre confused youβre not alone. Most people think, βHow can you have 100% moisture content? That canβt be right!β That 100% isnβt a typo, though. Think about it β a wood moisture content of 100% calculated using the dry weight as the basis for the calculation (Equation 3) means that 50% of the weight comes from the dry wood and 50% of the weight comes from the included water; the ratio of the wood and water weights is 1.0, hence the MC comes out to 100%. The number might look strange and unexpected, but itβs okay. The moisture contents of freshly-sawn logs or boards might be 75% or even higher β and sometimes the moisture content will be calculated as being over 100%. MCs over 100% are possible and can even exceed 200%! Thereβs an alternative form of the moisture content formula that some people prefer. The results are the same: 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΄ Using the numbers used above (the original ten pounds of chips containing both wood and water, dried to only five pounds of ovendry wood), you could calculate MC using Equation [5] like this: 10 ππΆ%=οΏ½5 β1οΏ½π₯100%=(2β1)π₯100%=100% [6] (See Appendix A for some sample numbers if youβd like to practice. The answers are provided.) 27PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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