This study questions the extent which steady-state calculation methods for the draught rate according to ISO 7730 are applicable to intermittent ventilation, especially with pulse durations shorter than 30 s. 37 subjects were exposed to intermittent ventilation in a cooling scenario at neutral room temperature, i.e. in an ambient that was neither warm nor cool. Two displacement air diffusers supplied the air alternatingly, 50% of the time from each side. The operation profile of each diffuser thus corresponded to a square waveform. The diffuser supply air temperature was at 19 °C while the room temperature was controlled to thermally neutral conditions at 22 °C. Two subjects sat directly in front of large air diffusers and were therefore located in the core region of a free jet with the cool air blowing from behind. The subjects were asked to evaluate their thermal comfort for nine conditions with air velocities between 0.2 ms^−1and0.6 ms⁻¹ and pulse durations between 10 s and 30 s. In intermittent ventilation, the discomfort was higher than in steady ventilation at the same maximum velocity. Draught perception increased with increasing velocity and with increasing pulse duration. Due to the enhanced mixing with ambient air in intermittent ventilation, the average air temperature 25 cm in front of the diffusers could be increased by 0.5 K.

这项研究对根据ISO 7730的通风速率的稳态计算方法适用于间歇通风的程度提出了质疑，尤其是在脉冲持续时间短于30 s的情况下。37名受试者在中性室温下（即既不温暖也不凉爽的环境）的凉爽环境中进行间歇通风。两个排量的空气扩散器交替地从两侧提供空气，时间间隔为50％。每个扩散器的工作曲线因此对应于方波。扩散器的供气温度为19°C，而室温控制为22°C，处于热中性条件。两个对象直接坐在大型空气扩散器的前面，因此位于自由射流的核心区域，冷空气从后面吹来。^-1和0.6 ms ^-1，脉冲持续时间在10 s和30 s之间。在间歇通风中，在相同最大速度下的不适感高于稳定通风。吃水感知随着速度增加和脉冲持续时间增加而增加。由于在间歇通风中增强了与环境空气的混合，因此散流器前25 cm处的平均空气温度可以增加0.5K。