Melikov A, Pitchurov G, Naydenov K, Langkilde G
Centre for Indoor Environment and Energy, Technical University of Denmark, Kgs Lyngby, Denmark.
Indoor Air. 2005 Jun;15(3):205-14. doi: 10.1111/j.1600-0668.2005.00337.x.
A field survey of occupants' response to the indoor environment in 10 office buildings with displacement ventilation was performed. The response of 227 occupants was analyzed. About 24% of the occupants in the survey complained that they were daily bothered by draught, mainly at the lower leg. Vertical air temperature difference measured between head and feet levels was less than 3 degrees C at all workplaces visited. Combined local discomfort because of draught and vertical temperature difference does not seem to be a serious problem in rooms with displacement ventilation. Almost one half (49%) of the occupants reported that they were daily bothered by an uncomfortable room temperature. Forty-eight per cent of the occupants were not satisfied with the air quality.
The PMV and the Draught Rating indices as well as the specifications for local discomfort because of the separate impact of draught and vertical temperature difference, as defined in the present standards, are relevant for the design of a thermal environment in rooms with displacement ventilation and for its assessment in practice. Increasing the supply air temperature in order to counteract draught discomfort is a measure that should be considered carefully; even if the desired stratification of pollution in the occupied zone is preserved, an increase of the inhaled air temperature may have a negative effect on perceived air quality.
对10座采用置换通风的办公楼内人员对室内环境的反应进行了实地调查。分析了227名人员的反应。调查中约24%的人员抱怨他们每天都受到气流的困扰，主要是小腿部位。在所走访的所有工作场所，头部和脚部水平之间测得的垂直空气温差均小于3摄氏度。在采用置换通风的房间里，由气流和垂直温差导致的综合局部不适感似乎并不是一个严重问题。几乎一半（49%）的人员报告说他们每天都受到室温不适的困扰。48%的人员对空气质量不满意。
当前标准中定义的预测平均投票值（PMV）、气流评级指数以及因气流和垂直温差的单独影响而产生的局部不适感规范，对于采用置换通风的房间热环境设计及其实际评估是相关的。为抵消气流不适而提高送风温度是一项应谨慎考虑的措施；即使在人员活动区保持了所需的污染分层，吸入空气温度的升高可能会对感知空气质量产生负面影响。
