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Section VII. Tables of Assembled Dry Kiln Schedules Conventional and Elevated Temperature Schedules: Hardwoods (Tables 1-123) This group of tables contains schedules suggested for use with hardwood lumber and specialty products. These schedules are typically used with steam-heated dry kilns. Change points are based on moisture content of sample boards. In several of the schedule headings, the word “modified” appears in parentheses after the coded designation, e.g., Table 2, T1-C2 (Modified). This means we have modified the suggested schedule(s) from Table 1 Agriculture Handbook 188, Dry Kiln Operator’s Manual, so that the wet-bulb temperature (WBT) is never less than 90 °F. During periods of hot humid weather, it may not be possible to achieve WBT’s below 90 °F even with continuous venting. When energy conservation is a prime consideration, continuous venting may not be the best overall alternative as heat is lost in this process of controlling the WBT or relative humidity in the kiln. As a practical approach, we have suggested limiting the minimum WBT to 90 °F. Most schedules have dry-bulb temperatures between 100 and 180 °F, though a few may go as high as 200 °F. T1-B1 (Modified) Temperature Equilibrium Temperature Moisture Dry- Wet- moisture Relative Dry- Wet- Step content bulb bulb content humidity bulb bulb pct - - - - - 36.0 35.5 37.0 35.0 32.0 32.0 T1-C2 (Modified) Temperature - - - - - - °F - - - - - - - - - - - - pcf - - - - - - - - - - - - °C 1 Above35 100 97 19.5 90 37.5 2 35to30 100 96 17.6 86 37.5 3 30to25 105 99 15.4 81 4 25to20 105 95 12.0 69 5 20 to 15 115 90 6.4 38 6 15 to Final 120 90 5.5 32 Equalize and condition as necessary (see appendix A). 40.5 40.5 46.0 49.0 Table 2 Temperature Equilibrium Moisture Dry- Wet- moisture Wet- Step content bulb bulb content humidity bulb bulb Relative Dry- - - - - - - °F - - - - - - 1 Above40 100 96 2 40to35 100 95 3 35to30 100 92 4 30to25 105 91 5 25to20 105 90 6 20to15 115 90 7 15toFinal 120 90 Equalize and condition as necessary (see appendix A). - - - - - - pct - - - - - 17.6 86 16.4 83 13.4 74 9.7 58 9.4 56 6.4 38 5.5 32 - - - - - - °C - - - - - - 37.5 35.5 37.5 35.0 37.5 33.5 40.5 32.5 40.5 32.0 46.0 32.0 49.0 32.0 pct 37PDF Image | Dry Kiln Schedules for Commercial Woods Temperate and Tropical
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