A Comparison of Energy Requirements for Kiln-Drying Southern Pine At Different Drying Temperatures
Keywords:
Drying energy, kiln drying, steam consumption, high-temperature drying, southern pine dryingAbstract
The energy consumption used to dry green pine dimension lumber in a 1,200-board-foot-capacity experimental kiln was studied at various operating conditions. Energy consumed by the steam-heated kiln was measured with the aid of a system of condensers and holding tanks that separated and collected the steam condensate.
Results show that charges dried at high temperature (240 F) required 12% less energy than similar charges dried in a similar way at 190 F, and 15% less energy than charges dried at temperatures between 165 and 175 F. Data are presented to illustrate that differences in energy for drying at different temperatures are the result of increased heat lost by radiation during the longer kiln residence required when drying at lower temperatures.
References
Bramhall, G., and S. McIntyre. 1977. Energy requirements for kiln drying lumber in theory and practice. Paper presented at session 33, FPRS Annual Meeting, Denver, Colorado.nCorder, E. S. 1976. Energy use in an industrial veneer dryer. For. Prod. J.26(9):3847.nDavis, V. C. 1954. Steam consumption in the kiln drying of western softwoods. For. Prod. J.4(5):258-260.nRosen, H. N. 1979. Unpublished data presented at the Symposium on High-Temperature Drying of Hardwoods, New Albany, Indiana.nTaylor, F. W. 1979. Energy consumption of southern pine kilns. S. Lumberman215(2680):85-88.n
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