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How Do I Determine The Size System I Need? The first step is to project how much lumber you’ll dry in a year. Then figure your average drying time for each of the species you’ll be drying, and you can calculate the size kiln you need from there. Take, for example, a requirement to dry 500,000 board feet of oak per year. Fresh off the saw, oak takes about 28-30 days to dry, so you’ll be able to do 12 loads in a year. Each load will need to be 42,000 board feet to give you the 500,000 board feet you need for the year. That means you could build a single 40-45,000 board feet chamber or two 20-25,000 board foot kilns. For more specific information, see the Capacity Chart on page 17. It is not a good idea to mix species, thicknesses, or moisture contents of lumber in one kiln, as all the wood will have to be dried based on the schedule of the slowest drying species and thickness,. All the lumber in the kiln will dry at the same rate, and the moisture content will equalize in the load. Therefore, if you’re going to be drying several species and thicknesses of lumber during the year, it’s better to use more smaller chambers rather than one large one, so you can keep each species and thickness in its own kiln. If you are drying air dried lumber, and it is all below 25% moisture content, you can mix species without trouble. It generally does not cost much more to have two smaller kilns than one large one, and the benefits of flexibility, loading times, and control of the drying processes will favor multiple smaller chambers over a single large one. If you are only drying one species and thickness of lumber in a month, a single kiln would be appropriate. Please contact Nyle to talk about different sizing options. Should The Drying Unit Be In The Kiln Or In An Equipment Room? Generally, the most efficient configuration is to have the blower coil cabinet inside the kiln chamber, with the compressor, controls, and electronics in the control room. This offers the best environment for the machinery while reducing installation and operating costs. Small systems that operate at lower temperatures often have the compressor inside the kiln chamber. Nyle can custom design a system based on your specific requirements. 14PDF Image | INTRODUCTION TO KILN DRYING
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