20世纪90年代引入美国的美国建筑业，由于结果参差不齐，采用地板下空气分配（UFAD）系统的速度较慢。在成功的安装中，UFAD系统能够降低寿命周期成本、改善热舒适性、改善室内空气质量、控制单个乘客，并降低能源成本。然而，在某些情况下，由于设计和施工技术不足，UFAD系统性能不佳，导致空气泄漏和乘客不适。随着设计师越来越熟悉UFAD系统和施工技术的改进，UFAD系统开始被广泛用于商业办公楼，以提供空间调节和通风。 本文对一个主要由UFAD系统调节的办公空间内的乘员热舒适性进行了现场研究。这项实地研究是在俄勒冈州波特兰市中心十二西楼的办公室进行的。十二西楼是一栋LEED白金高端公寓楼，较低楼层有办公和零售空间。这些办公室主要由UFAD系统调节，辅以自然通风和被动冷却光束，以帮助抵消夏季的太阳能增益。这项研究报告了对十二西楼办公空间的常住者进行的热舒适性调查的结果。结果表明，安装的UFAD系统能够为ASHRAE标准55规定的乘员提供满意的热舒适性。 本研究考察了性别、年龄、离外窗的距离和工作空间类型等因素，包括每个因素与感知热舒适之间的统计显著性。引用:ASHRAE论文CD:2014 ASHRAE冬季会议，纽约

Introduced to the U.S. in the 1990s, the U.S. building industry has been slow to adopt underfloor air distribution (UFAD) systems due to mixed results. In successful installations, UFAD systems are able to provide reduced life cycle costs, improved thermal comfort, better indoor air quality, individual occupant control, and reduced energy costs. However, in some cases UFAD systems perform poorly due to inadequate design and construction techniques, leading to air leakage and occupant discomfort. As designers have become more familiar with UFAD systems and construction techniques have improved, UFAD systems are beginning to be widely adopted for use in commercial office buildings to provide space conditioning and ventilation.This paper presents a field study on occupant thermal comfort in an office space which is mainly conditioned by a UFAD system. The field study was conducted in offices at the Twelve West building in downtown Portland, Oregon. The Twelve West building is a LEED Platinum, high end apartment building with office and retail space on the lower levels. The offices are mainly conditioned by a UFAD system, supplemented by natural ventilation and passive chilled beams to help offset solar gains in the summer months. This study reports the results of a thermal comfort survey administered to regular occupants of the office space in the Twelve West building. The results show that the installed UFAD system was able to provide satisfactory thermal comfort to the occupants as defined by ASHRAE Standard 55. A number of factors including gender, age, proximity to external windows, and workspace type are examined in this study, including the statistical significance between each factor and perceived thermal comfort.