| 摘要: |
| 本文在配置有冷却顶板与混合通风的人工环境室中设置电热膜模拟外围护结构传热，在冷负荷分别为83 W/m2及111 W/m2条件下，通过实验的方法研究典型辐射空调房间室内空气分布特性。结果表明：当冷却顶板表面温度变化范围为15~23 ℃及送风温度为22 ℃时，室内垂直方向1.7 m以下空气温度及速度分布较均匀，而1.7 m以上呈显著变化，CO2浓度在工作区附近的CO2浓度较高，而在顶板及地板附近浓度较低。此外，平均垂直空气温差、紊流强度及除污效率的变化范围分别为0.1~0.2 ℃、32%~38%及0.62~0.86。因此，冷却顶板表面温度的变化对室内平均垂直空气温差、紊流强度影响较小，而对除污效率影响较大。 |
| 关键词: 冷却顶板 混合通风 垂直空气温差 紊流强度 除污效率 |
| DOI： |
| Received:July 18, 2018Revised:November 02, 2018 |
| 基金项目:国家自然科学基金 (51408482 & 51808091),中央高校基本科研业务费(DUT17RC(3)086)和大连大学博士启动专项基金(20172QL020)资助。 |
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| Indoor Air Distribution Characteristics in a Room with Chilled Ceiling and Mixed Ventilation |
|
Gao Jie1, Wu Xiaozhou2, Lü Pin2, Wang Shugang2, Wang Fenghao3
|
| (1.College of Civil Engineering and Architecture, Dalian University;2.School of Civil Engineering, Dalian University of Technology;3.School of Human Settlements and Civil Engineering, Xi'an Jiaotong University) |
| Abstract: |
| 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. |
| Key words: chilled ceiling mixed ventilation vertical air temperature difference turbulence intensity contaminant removal effectiveness |
