Application of radio-frequency heating to utility poles. Part 1. Radio-frequency/vacuum drying of roundwood

Citation
F. Fang et al., Application of radio-frequency heating to utility poles. Part 1. Radio-frequency/vacuum drying of roundwood, FOREST PROD, 51(7-8), 2001, pp. 56-60
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
FOREST PRODUCTS JOURNAL
ISSN journal
0015-7473 → ACNP
Volume
51
Issue
7-8
Year of publication
2001
Pages
56 - 60
Database
ISI
SICI code
0015-7473(200107/08)51:7-8<56:AORHTU>2.0.ZU;2-K
Abstract
Electromagnetic radiation, such as radio-frequency heating has been shown t o rapidly heat wood. Previous research at The University of British Columbi a focused on the drying of sawnwood using a radio-frequency/vacuum (RF/V) d ryer with flat parallel plates. The study described in this paper examined the potential of RF/V drying to rapidly dry roundwood. The investigation wa s carried out in a laboratory RF/V dryer at a stabilized frequency of 13.65 MHz. During drying, the change in the temperature with time, within each r oundwood section, was continuously monitored. Examination of al the experim ental runs confirmed that the RF/V unit with a flat electrode design, could dry 165- to 240-mm diameter and 2.0- to 2.4-m-long pole sections, from the ir initial sapwood moisture content (MC) of over 80 percent, to a final MC of less than 25 percent. This was accomplished with limited loss in quality , in less than 16 hours. Furthermore, RF/V drying produced poles with a uni form final MC.