| Numerical Analysis of Influencing Factors on Temperature Field and Airflow Distribution of the Displacement Ventilation System |
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| 作者姓名： | 那艳玲 邢金城 涂光备 于松波 |
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| 作者单位： | SchoolofEnvironmentScienceandTechnology,TianjinUniversity,Tianjin300072,China |
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| 摘 要： | Indoor air quality and thermal comfort are important features of indoor environment, In this paper, a numerical simulation based on the k-ε model of CFD is used to analyze factors such as loading, exterior-protected construction, blowing-in rate that play an important role in the temperature field and airflow field of the displacement ventilation system. Exterior-protected construction has little influence on indoor temperature distribution of displacement ventilation systems and the influence is limited only in a small area near the external wall when the indoor heat source is the main cooling load. The height of a room has little influence on indoor temperature field, and the temperature gradient of active region is basically unchanged. In the system combined with a displacement ventilation system and a cooling system, the height also has little influence. When the cooling load is high,the indoor heat source creates a strong convective plume, which will make the average indoor air age lower, the ventilation efficiency higher and the elimination of pollutant easier. Air supply rate plays an important role in displacement ventilation systems. The increase of air supply rate that can be realized by increasing the air supply velocity and enlarging the area of air inlet will increase the mass capability of the system and diminish the vertical temperature gradient. From the comparison between simulations and experiments, it is concluded that this simulation are creditable.
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| 关 键 词： | 数字分析 温度 气流分布 室内空气质量 采暖设备 冷却负载 外保护建筑 气供应率 节能 |
Numerical Analysis of Influencing Factors on Temperature Field and Airflow Distribution of the Displacement Ventilation System |
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| Na Yanling,XING Jincheng,TU Guangbei,YU Songbo.Numerical Analysis of Influencing Factors on Temperature Field and Airflow Distribution of the Displacement Ventilation System[J].Transactions of Tianjin University,2005,11(1):66-72. |
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| Authors: | Na Yanling XING Jincheng TU Guangbei YU Songbo |
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| Abstract: | Indoor air quality and thermal comfort are important features of indoor environment. In this paper, a numerical simulation based on the k-ε model of CFD is used to analyze factors such as loading, exterior-protected construction, blowing-in rate that play an important role in the temperature field and airflow field of the displacement ventilation system. Exterior-protected construction has little influence on indoor temperature distribution of displacement ventilation systems and the influence is limited only in a small area near the external wall when the indoor heat source is the main cooling load.The height of a room has little influence on indoor temperature field, and the temperature gradient of active region is basically unchanged. In the system combined with a displacement ventilation system and a cooling system, the height also has little influence. When the cooling load is high,the indoor heat source creates a strong convective plume, which will make the average indoor air age lower, the ventilation efficiency higher and the elimination of pollutant easier. Air supply rate plays an important role in displacement ventilation systems. The increase of air supply rate that can be realized by increasing the air supply velocity and enlarging the area of air inlet will increase the mass capability of the system and diminish the vertical temperature gradient. From the comparison between simulations and experiments, it is concluded that this simulation are creditable. |
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| Keywords: | cooling load exterior-protected construction air supply rate CFD numerical simulation energy-saving |
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