辐射空调房间室内空气分布特性实验研究

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.