Equilibrium Moisture Content of Wood At High Temperatures
Keywords:Equilibrium moisture content, relative humidity, dryer control, high-temperature drying
AbstractIn answer to increased interest in using high-temperature (above 212 F) drying of wood, a method is described to extrapolate low-temperature equilibrium moisture content (EMC) data to high temperatures. The results are compared with data in the literature, and EMC data from 212 F to 300 F are presented in a form useful for kiln control as well as for other uses.
Engelhardt, F. 1979. Investigations on the sorption of water vapor by beech at temperatures ranging from 110° to 170° C. Holz Roh- Werskt. 37(3):99-112.nGrumach, M. 1951. The equilibrium moisture content of wood in superheated steam. CSIRO, Div. For. Prod., Proj. S 17 Prog. Rep. 5.nHann, R. A. 1965. An investigation of the drying of wood at temperatures above 100 degrees centigrade. Ph.D. thesis. N.C. State University. Raleigh, NC.nHailwood, A. J., and S. Horrobin. 1946. Absorption of water by polymers: Analysis in terms of a simple model. Trans. Faraday Soc. 42B:84-102.nHawkins, G. A. 1978. Thermal properties of substances and thermodynamics. In Mark's standard handbook for mechanical engineers. 8th ed. McGraw-Hill, NY. Pp. 4-31.nKauman, W. G. 1956. Equilibrium moisture content relations and drying control in superheated steam drying. For. Prod. J. 6(9):328-332.nKeylwerth, R. 1949. Fundamentals of high-temperature drying of wood. Holz Zentralbl. 75(76):953-954.nKollman, F., and L. Malmquist. 1952. Research on seasoning sawn pine timber at high temperatures. Medd. Sven. Traforskn. Inst. Avd. 23.nLadell, J. L. 1957. High temperature kiln drying of eastern Canadian softwoods. West. For. Prod. Lab. Tech. Note 2. Vancouver, B.C., Can.nLutz, J. F. 1974. Drying veneer to a controlled final moisture content by hot pressing and steaming. USDA For. Serv. Res. Pap. FPL 227. For. Prod. Lab., Madison, WInRasmussen, E. F. 1961. Dry kiln operator's manual. U.S. Dep. Agric., Agric. Handb. 188. Washington, D.C. P. 11.nRosen, H. N., and W. T. Simpson. 1980. Evaluating humidity at dry-bulb temperatures above the normal boiling point of water. Wood Fiber. 13(1):97-101.nSeborg, C. O., and A. J. Stamm. 1931. Ind. Eng. Chem. 23:1271-1275.nSimpson, W. T. 1971. Equilibrium moisture content prediction for wood. For. Prod. J. 21(5):48-49.nSimpson, W. T. 1973. Predicting equilibrium moisture content of wood by mathematical models. Wood Fiber. 5(1):41-49.nStamm, A. J., and W. K. Loughborough. 1935. Thermodynamics of the swelling of wood. J. Phys. Chem. 39:121-132.nStrickler, M. D. 1968. High temperature moisture relations of grand fir. For. Prod. J. 18(4):69-75.nSturany, H. 1952. The Schilde air-free steam dryer for wood. Holz Roh- Werkst. 10:358-362.nU.S. Forest Products Laboratory. 1974. Wood handbook. U.S. Dep. Agric., Agric. Handb. 72, rev., For. Prod. Lab., Madison. WI. Pp. 3-8.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.