| Title |
Development of Airflow Control-Unit in Small Test Chamber for Controlling Mass Transfer Coefficients on Surface of Testing Material |
| Authors |
Seo Jang-Hoo ; Lee Sun-Woo ; C ho Min-Kwan |
| Keywords |
Mass Transfer Coefficient ; Small Test Chamber ; Airflow Control-unit ; Airflow Analysis |
| Abstract |
The purpose of this study is to develop the airflow control-unit in the small test chamber for controlling the mass transfer coefficient on the surface of testing material. The mass transfer coefficient is a very important parameter in the test for measuring chemicals emission rates and the performance test of sorptive building materials with a small test chamber. The mass transfer coefficient reduced vapor of surface of testing material in 20L small test chamber is 2∼3m/h, which is smaller than it of japanese industrial standards and do not correspond to an actual condition in the room. In this paper, the water vapor mass transfer coefficients and emission rates of water were measured under various wind velocity on surface of testing material using both experiments and computational fluid dynamics analysis. While the average wind velocity over the testing material of 9.31×10-2m/s was controlled, the evaluated mass transfer coefficient corresponded well to an actual condition in the room. And the emission test and sorption test will be precisely evaluated by using the airflow control-unit in the small test chamber. |