New monitoring concept of moisture content distribution in wood during RF/vacuum drying

被引：37

作者：

Cai, Yingchun

Hayashi, Kazuo ^{[1
]}

机构：

[1] Ehime Univ, Fac Agr, Dept Forest Resources, Matsuyama, Ehime 7908566, Japan

[2] NE Forestry Univ, Minist Educ, Key Lab Biobased Mat Sci & Technol, Harbin 150040, Peoples R China

来源：

JOURNAL OF WOOD SCIENCE | 2007年 / 53卷 / 01期

基金：

中国国家自然科学基金;

关键词：

moisture content; pressure in wood; relative humidity; RF/vacuum drying; temperature in wood;

D O I：

10.1007/s10086-006-0813-4

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

A new method for monitoring moisture content during radio-frequency (RF)/vacuum drying was developed by measurement of temperature and pressure in wood. Temperature and pressure inside the wood were measured simultaneously during RF/vacuum drying at the same point. The relative humidity (RH) and moisture content (MC) below the fiber saturation point (FSP) were calculated based on temperature and pressure, and the relationship between the temperature, RH, and equilibrium moisture content (EMC) at the measurement point. When the moisture content was below the FSP, the calculated MC was slightly greater than the value given by oven drying. The absolute error was within 0.8% near the open cross side, and was within 1.8% at another measurement point. Thus, we concluded that it was practicable to monitor the moisture content below the FSP according to the temperature and pressure inside the wood.

引用

页码：1 / 4

页数：4