An official website of the United States government. I'm trying to find a timetable or drying schedule for the basic dehumidification kilns you see on youtube. Operation and cost of a small dehumidification dry kiln Dehumidification drying equipment is available, but an enclosure must be built to house the equipment and dry the lumber. If your lumber stack is built on starter blocks, you will need to limit airflow there as well. Although dehumidification kilns are slower than conventional kilns for drying, the lower drying temperature has the reported advantage of less degrade and less shrinkage. For 4/4 hard maple, with an initial temperature of 90F and an initial relative humidity of 81%, the SDR was given as .0061 pints per hour per board foot. As you can recycle . 0000003109 00000 n Official websites use .gov I know mixed loads are taboo, but this one worked well, other than the horse chestnut. The water tray can be removed and emptied manually, or a hole can be drilled through the wall of the shed to pass a drain tube. Know how to choose and apply the correct schedule for the lumber. )f7haRoMRhib5Sd|-=RBkBBN r-hzf+1\IFgk;v]3_, KxL$9oL "Qw#"BFGfk}>cT2g yP K|7@N*v9!Wy9jB. op(y"X)Fz"q]fQC/ha>7=k_p}}^VXQmj e'2fyXQ{~23X^H1,d>Hq|^KQ*cN=yF%z. Drying small amounts of lumber using a dehumidification kiln is a suitable option for woodworkers even with limited knowledge of kilns. Difficult-to-dry species might not exceed 60 C (140 F). 0000000710 00000 n . Place a sticker at each end, and every 16" along the stack for 4/4 stock. The last thing to do before starting the kiln is to close the gable vent with an insulated cover. In smaller kilns, the heat generated by the fans and DH motor is sufficient to maintain temperatures in excess of 100 degrees. With each load I did not have the initial relative humidity rate. Subtract the wet-bulb depression from the dry-bulb temperatures for each schedule step and enter the value in the fifth column. Just walk out to the shed kiln and grab what you need from your custom-dried supply. The stickers are uniform in size and usually 3/4 or 1 square. I am removing water about 50% below the SDR. A dehumidification kiln makes sense particularly when the lumber is air-dried first. Hardwood kiln drying schedules typically keep the dry bulb temperature below 80 C (176 F). I selected a 36 outswing exterior door. At the planer mill, warped 2 by 4's represent a significant loss in value. (I have found that remotely monitoring the temperature and humidity with a WiFi sensor can be very helpful. Thicker lumber like 5/4 or quartersawn lumber is naturally more stable. A bead of silicone caulking between the subfloor and sill plate will prevent air infiltration. Willie Sandry is a furniture maker and a lumber kiln operator in Camas, Washington. 1. 9. At the end of the cycle I have the opposite problem. endstream endobj 283 0 obj <>/Metadata 40 0 R/OCProperties<>/OCGs[294 0 R]>>/Outlines 53 0 R/PageLayout/SinglePage/Pages 280 0 R/StructTreeRoot 72 0 R/Type/Catalog>> endobj 284 0 obj <>/Font<>/Properties<>/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 285 0 obj <>stream Please refer to Appendix A which shows the Lumber Dry Kiln Bill of Materials. Place some sample boards in the stack that will be easy to pull out for moisture testing later. To condition the lumber, I introduce steam into the kiln for about two hours. A small "m" after the designation indicates that the wet-bulb temperatures should be adjusted to avoid temperatures below 90 F. See the above mentioned publication for details. Many articles have been dedicated to solar lumber kilns: everything from a simple sheet of Visqueen over a stack of lumber in the sunshine to elaborate enclosures designed for solar gain.

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