Evaluation of Three Semi-empirical Models for Superheated Steam Vacuum Drying of Timbers |
| |
Authors: | Diego Elustondo Luiz Oliveira Stavros Avramidis |
| |
Affiliation: | a Department of Wood Science, The University of British Columbia, Vancouver, BC, Canadab Forintek Canada Corporation, Vancouver, BC, Canada |
| |
Abstract: | Superheated steam drying at sub-atmospheric pressure (SSV) has been successfully employed in Europe and Asia for drying some types of timbers, showing that drying time could be reduced by 50% with respect to conventional drying without significant losses in the quality of the final product. This reduction is the consequence of a different heat and mass transfer control mechanism. Since SSV drying is carried out in absence of gaseous air, diffusion of the generated vapor is not a limiting factor and drying rate becomes more dependent on heat transference. Therefore, classical interpretation of timber drying as a process based on moisture migration control is not applicable to SSV. This work is targeting the development and validation of a simplified semi-empirical model for SSV drying of timbers. Mathematical representation of the proposed model is uncomplicated and straightforward to apply, and the comparison between model predicted and experimental data showed a high degree of agreement under variable drying conditions. |
| |
Keywords: | Modeling Timber Drying Superheated steam Vacuum |
本文献已被 InformaWorld 等数据库收录! |
|