The study investigates a hybrid radiant cooling system's potential to achieve thermal comfort. The hybrid radiant cooling (HRC) system combines the best features of a typical all-air and conventional chilled radiant cooling system. An HRC system presents the advantages to (a) reduce vapour condensation and to (b) adjust the cooling output by using an Airbox convector. The three systems perceive thermal comfort in the predicted mean vote (PMV) between –0.5 and +0.5 at 25 and 27°C. In the room condition at 31°C, the all-air system has a lower thermal comfort level because the elevated airspeed is less effective when the mean radiant temperature (MRT) is low. This study suggests a cooling strategy to maximize the thermal comfort level by effectively utilizing the HRC in extreme conditions without extra cooling sources. When the designed set point indoor temperature is 25°C, the Airbox convector of the HRC fan can be off. However, if the indoor air temperature increases above 25°C, an occupant can activate the Airbox convector; the actual thermal output of HRC is increased, and the elevated airspeed can reduce the predicted percentage dissatisfied (PPD) level. Even in an extreme indoor thermal condition at 31°C, the HRC minimizes the PPD level.

该研究调查了混合辐射冷却系统实现热舒适的潜力。混合辐射冷却 (HRC) 系统结合了典型全空气和传统冷却辐射冷却系统的最佳特性。HRC 系统具有以下优点：(a) 减少蒸汽冷凝和 (b) 通过使用 Airbox 对流器来调整冷却输出。在 25°C 和 27°C 下，三个系统在 –0.5 和 +0.5 之间的预测平均投票 (PMV) 中感知热舒适度。在 31°C 的室内条件下，全空气系统的热舒适度较低，因为当平均辐射温度 (MRT) 较低时，提高空速的效果较差。这项研究提出了一种冷却策略，通过在没有额外冷却源的极端条件下有效利用 HRC 来最大限度地提高热舒适度。当设计的设定点室内温度为 25°C 时，可以关闭 HRC 风扇的 Airbox 对流器。但是，如果室内空气温度升高到 25°C 以上，乘员可以激活 Airbox 对流器；HRC 的实际热输出增加，而提高的空速可以降低预测不满意百分比 (PPD) 水平。即使在 31°C 的极端室内热条件下，HRC 也能最大限度地降低 PPD 水平。