地板下空气分配（UFAD）系统在过去十年中得到了更广泛的应用。与传统的高架混合通风（MV）系统相比，UFAD系统被认为可以提供更好的二氧化碳排放、减少能源使用、提高乘客对热舒适的满意度，以及更容易的重新配置，但相关的现场评估报告相对较少。用于评估通风性能的一个指标是使用CO2作为示踪气体的污染物去除效率。文献中的一项现场研究确定，在LEED 1.0商业新建试验办公楼中，恒流系统的污染物去除效率低于预期。本文报道了采用管道变量对污染物去除效果和呼吸水平下CO2浓度的现场研究- LEED白金建筑中的风量（VAV）UFAD系统。评估了各种居住密度、扩散器位置和房间类型。总体而言，UFAD的性能优于之前报道的恒流系统。测量期间的空间和条件特征与之前的研究进行了比较。讨论了影响两种系统性能差异的因素。引文:ASHRAE Transactions，第117卷，第2部分，魁北克省蒙特利尔

Underfloor air distribution (UFAD) systems have been more widely used over the past decade. UFAD systems are believed to provide better CO2 extraction, reduced energy use, improved occupant satisfaction with thermal comfort, and easier reconfiguration relative to conventional overhead mixing ventilation (MV) systems, but relatively few field evaluations have been reported. One metric used in evaluating ventilation performance is pollutant removal effectiveness using CO2 as the tracer gas. A field study found in the literature determined that pollutant removal effectiveness was poorer than expected for a constant flow system in a LEED 1.0 commercial new construction pilot office building. This paper reports a field study of pollutant removal effectiveness and CO2 concentration at breathing level with a ducted variable-air-volume (VAV) UFAD system in a LEED platinum building. A variety of occupancy densities, diffuser locations, and room types were evaluated. Overall, the performance of the UFAD was better than reported for the previously reported constant flow system. The characteristics of the spaces and conditions during measurement are compared with those in the previous study. Factors affecting differences in performance for the two systems are discussed.