Indoor Air Distribution Characteristics in a Room with Chilled Ceiling and Mixed Ventilation
In this study, an electric-heating film was set up in a climate chamber to simulate the heat transfer in an external building envelope. Then, the indoor air distribution characteristics in a room with chilled ceiling and mixed ventilation were studied when the cooling loads were 83 or 111 W/m2. The...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2019-01-01
|
| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2019.04.144 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In this study, an electric-heating film was set up in a climate chamber to simulate the heat transfer in an external building envelope. Then, the indoor air distribution characteristics in a room with chilled ceiling and mixed ventilation were studied when the cooling loads were 83 or 111 W/m2. The results show that a uniform vertical temperature profile below 1.7 m as well as a non-uniform temperature profile above 1.7 m existed when the ceiling surface temperatures varied from 15 to 23 ℃ and the supply air temperature was 22 ℃. The CO2 concentration was large in the occupied zone and small near the ceiling or floor. Moreover, the average vertical air temperature difference, turbulence intensity, and contaminant removal effectiveness were 0.1–0.2 ℃, 32%–38% and 0.62–0.86, respectively. Therefore, the changes in the ceiling surface temperature slightly affected the vertical air-temperature difference and turbulence intensity, whereas they clearly influenced the contaminant removal effectiveness. |
|---|---|
| ISSN: | 0253-4339 |