Thermal environments generated by diffuse ceiling ventilation (DCV), chilled beam (CB), and chilled ceiling with mixing ventilation (CCMV) systems were compared at different heat loads. Experiments were carried out in two test chambers, in which a double office layout was investigated near heated windows. The heat load strength was increased from a normal level of 37–40 W/floor-m² to a peak load level of 57–64 W/floor-m² to observe effects on indoor air thermal conditions and draft discomfort. The target indoor air temperature was 26 ± 0.5 °C in the occupied zone. The results show that the air temperature, air speed, and draft rate levels were reasonable at a normal load and increased slightly at peak load conditions. The CCMV system provided the smallest share of locations in which the draft rate level was higher than 10%. None of the studied systems achieved the category A defined by EN ISO 7730. However, all the systems fulfilled the demands of category B, except for CB, which fell to category C at the peak load conditions by exceeding the draft rate limit in one location. Thermal conditions were at a similar level for the studied systems. However, CCMV may reduce slightly the draft discomfort.

比较了在不同热负荷下由弥散天花板通风（DCV），冷梁（CB）和带混合通风的冷天花板（CCMV）系统产生的热环境。实验是在两个测试室中进行的，其中在加热的窗户附近研究了双办公室布局。热负荷强度从正常水平37-40 W / floor-m ²增加到最大负荷水平57-64 W / floor-m ²观察对室内空气热状况的影响和通风不适。在占用区域中，目标室内空气温度为26±0.5°C。结果表明，在正常负载下，空气温度，空气速度和通风速率水平是合理的，而在峰值负载条件下则略有增加。CCMV系统在草稿率高于10％的位置中所占份额最小。所研究的系统均未达到EN ISO 7730定义的A类。但是，除CB以外，所有系统均满足B类的要求，因为CB在峰值负载条件下超过了一个位置的吃水速度限制而降至C类。对于所研究的系统，热条件处于相似的水平。但是，CCMV可以略微减轻吃水不适感。