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Experimental study on airflow characteristics with asymmetrical heat load distribution and low-momentum diffuse ceiling ventilation

机译：非对称热负荷分布和低动量扩散顶棚通风的气流特性实验研究

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摘要

Airflow characteristics were studied with asymmetrically distributed heat load and diffuse ceiling ventilation. The heat load was gradually increased from 40 to 80 W/floor-m(2) while the target temperature of exhaust air was kept at 26 +/- 0.5 degrees C. Experiments were carried out in a test room by conducting measurements with omnidirectional anemometers, data loggers and marker-smoke visualizations. The heat load consisted of two opposite workstations next to heated window panels in the perimeter area. The other side of the room was an open area describing a corridor zone. The workstation had a seated test dummy with laptop and monitor. The results indicate that asymmetrical heat load distribution creates a large-scale circulating airflow pattern from the heat sources to the opposite side of the room. Furthermore, the mean air speed and the airflow fluctuation increased with heat load and supply airflow rate. Consequently, also the turbulent kinetic energy and the turbulence dissipation increased. However, heat load had only a small effect on the turbulence intensity and the fluctuation energy ratio. Therefore, draught rate increased significantly with mean air speed. The observed results agree mainly with the symmetrical heat load results otherwise, except for the systematic large-scale circulation that was not found in the symmetrical test case. The maximum draught rate was 18-21% indicating the category B-C of thermal environment defined by the European Standard EN ISO 7730:2005. The thermal conditions at the investigated heat loads of 40-80 W/floor-m(2) were not able to fulfill the category A.
机译：在不对称分布的热负荷和顶棚通风情况下研究了气流特性。在排气目标温度保持在26 +/- 0.5摄氏度的同时，热负荷从40 W / floor-m（2）逐渐增加。通过使用全方位风速计进行测量，在测试室中进行了实验，数据记录器和标记烟可视化。热负荷由两个相对的工作站组成，它们在周边区域中紧挨着加热的窗户面板。房间的另一侧是一个开放区域，描述了走廊区域。工作站上有一个坐着的测试假人，笔记本电脑和显示器。结果表明，不对称的热负荷分布会产生从热源到房间另一侧的大规模循环气流模式。此外，平均风速和气流波动随热负荷和送风量的增加而增加。因此，湍动能和湍流耗散也增加。但是，热负荷对湍流强度和波动能量比的影响很小。因此，气流速度随平均风速显着增加。观察到的结果主要与对称热负荷结果相符，除此之外，除了对称测试用例中未发现的系统大规模循环外。最大抽风率为18-21％，表明由欧洲标准EN ISO 7730：2005定义的B-C类热环境。在调查的40-80 W / floor-m（2）的热负荷下的热条件不能满足A类要求。

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