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Cooling capacity of diffuse ceiling ventilation system and the impact of heat load and diffuse panel distribution

机译：冷却能力漫射天花板通风系统及热负荷和漫射板分布的影响

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摘要

Diffuse ceiling ventilation system is an air distribution system based on the low-impulse supply of air through the perforated panels installed as the suspended ceiling. A ceiling with diffuse supply typically consists of active and passive panels, where active panels allow airflow. Diffuse ceiling ventilation system has been proven to have a higher cooling capacity compared to conventional air distribution systems, e.g. mixing or displacement ventilation systems. Several parameters have an impact on the cooling capacity of the system though. The present research study evaluates the cooling capacity of the diffuse ceiling ventilation system in connection to two essential parameters, i.e. the distribution of heat load in the room and the distribution of active diffuse panels in the ceiling. The evaluation is based on full-scale experiments performed in a laboratory-controlled environment as well as numerical studies with Computational Fluid Dynamics (CFD) simulations. The cooling capacity of the system in several scenarios with different heat load and active diffuse panel distribution are compared under a certain thermal comfort condition. The results indicate the highest cooling capacity in the scenario with evenly distributed heat load in the room and compact distribution of active diffuse panels in the ceiling, while the active panels cover almost one-third of the suspended ceiling. The system is at its minimum cooling capacity in the scenario with compact heat load distribution in the room and disperse distribution of active diffuse panels in the ceiling.
机译：扩散天花板通风系统是一种空气分配系统，基于作为悬挂式天花板安装的穿孔面板的低脉冲供应。具有漫射电源的天花板通常由主动和无源板组成，主动面板允许气流。与传统的空气分配系统相比，已经证明漫射吊顶通风系统具有更高的冷却能力，例如，例如传统的空气分配系统。混合或位移通风系统。几个参数对系统的冷却能力产生了影响。本研究研究评估了与两个基本参数相关的扩散天花板通风系统的冷却能力，即房间中的热负荷分布以及天花板中的活性漫射板的分布。评估基于在实验室控制的环境中进行的全规模实验，以及具有计算流体动力学（CFD）模拟的数值研究。在某种热舒适条件下比较了在多种热负荷和有源漫射面板分布的若干方案中的系统的冷却能力。结果表明，在房间内具有均匀分布的热负荷的场景中的最高冷却能力和天花板中的有源漫射板的紧凑型分布，而主动面板覆盖着悬挂天花板的几乎三分之一。该系统处于其场景中的最小冷却能力，在房间中具有紧凑的热负荷分布和天花板中的有源漫射板的分散分散。

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