Factors affecting relative humidity during wood vacuum drying

Effects of pressure and temperature in the chamber during vacuum drying on the relative humidity and evaporation of wood surface were investigated by using the vacuum chamber. The setting temperature during vacuum drying included dry-bulb temperature td, the wet-bulb temperature tw and the temperature difference between the air in the vacuum chamber and the cooling water in the condenser. Results indicated that relative humidity during vacuum drying was affected by the dry-bulb temperature td, the wet-bulb temperature tw and the temperature difference between the air in the vacuum chamber and the water in the condenser. Relative humidity of wood decreased with the increase in temperature at the given temperature of the water in the condenser. The relative humidity was affected slightly by pressure in the vacuum chamber pA, and it decreased from 70% to 65% with pA increased from 50 kPa to 101 kPa. Moreover, there was nearly no evaporation under the vacuum without external heating.

作 者： XIAO Hui CAI Ying-chun   作者單位： Key Laboratory of Bio-based Material Science and Technology, Northeast Forestry University, Harbin 150040, P.R China  刊 名： 林業研究（英文版）  英文刊名： JOURNAL OF FORESTRY RESEARCH  年，卷(期)： 2009 20(2)  分類號： S7  關鍵詞： influencing factors   radio frequency   relative humidity   wood vacuum drying  

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