This study investigates the thermal comfort, airspeed and temperature distribution, air change effectiveness and importance of the boundary conditions on the selection and performance of Active Chilled Beams (ACB). Many past studies in cooling confirm that the thermal comfort is satisfactory because the temperature gradient and airspeeds are acceptable at the occupant level without addressing the local discomfort. Similarly, no known study was found to address thermal comfort in heating. This paper reports the results of an experimental study that addresses such issues. A laboratory experiment, simulating a multi-occupant open office with an ACB subjected to different boundary conditions, was conducted. The heating test results demonstrate that there is a risk of discomfort due to radiant temperature asymmetry. It also shows no airspeed in the occupied zone, which reduces the air change effectiveness. The cooling test results demonstrate that discomfort draft risk at the ankle level is higher in ACB parallel to window configuration. The results suggest that shape and throw of ACB affect air distribution and emphasize the importance of properly selecting, orienting, and designing ACB, not just to offset the room loads, but to match the proportions and boundary conditions of the space.

这项研究调查了热舒适性，空速和温度分布，换气效率以及边界条件对主动冷梁（ACB）的选择和性能的重要性。过去许多关于冷却的研究证实了热舒适性是令人满意的，因为在乘员水平上温度梯度和空速是可以接受的，而没有解决局部不适。同样，也没有发现针对加热中的热舒适性的已知研究。本文报告了针对此类问题的实验研究结果。进行了一个实验室实验，模拟了一个具有不同边界条件的ACB的多人开放式办公室。加热测试结果表明，由于辐射温度不对称，可能会有不适感。它还显示了在占用区域中没有空速，这降低了换气效率。冷却测试结果表明，ACB与车窗配置平行时，脚踝水平的不适吃水风险更高。结果表明ACB的形状和投掷会影响空气分配，并强调正确选择，定位和设计ACB的重要性，不仅要抵消房间的负荷，还要匹配空间的比例和边界条件。