Journal article
Modeling internal temperature changes of timber poles during ACA treatment
Wood Science and Technology, Vol.26(3), pp.227-240
1992
Abstract
The temperature-time-location relationships during steam conditioning and pressure treatment of timber poles using ammoniacal copper arsenate (ACA) have been studied and a new mathematical model that incorporates both the thermal properties of the poles and the parameters of the treatment process is discussed. Prediction equations and charts are presented that show the minimum required steaming time to satisfy the 1982 Rural Electrification Authority (REA) purchase specification, i.e. a center temperature above 150 °F (65.5 °C) for 2 hours. A six hour steaming time, commonly used for ACA treatment, has been found to be too short to bring poles with diameters larger than about 40 cm to the required sterilization conditions. Therefore longer steaming times, predicted using the methods given here, are recommended. The temperature of the preservative used does not appear to be a major factor in determining the maximum temperature achieved at the center of a pole, but it can influence the length of time the pole is above 65.5 °C.
Details
- Title
- Modeling internal temperature changes of timber poles during ACA treatment
- Authors
- E Sahle-Demessie (Author) - Oregon State University, United StatesK L Levien (Author) - Oregon State University, United StatesJeffrey J Morrell (Author) - Oregon State University, United StatesM Newbill (Author) - Oregon State University, United States
- Publication details
- Wood Science and Technology, Vol.26(3), pp.227-240
- Publisher
- Springer
- Date published
- 1992
- DOI
- 10.1007/BF00224295
- ISSN
- 0043-7719
- Organisation Unit
- University of the Sunshine Coast, Queensland; National Centre for Timber Durability and Design Life
- Language
- English
- Record Identifier
- 99451228202621
- Output Type
- Journal article
Metrics
298 Record Views