换气量对地板送风房间可吸入颗粒物浓度的影响

可吸入颗粒物浓度是影响室内空气品质的重要因素.为了研究地板送风空调系统室内空气品质,分析了室内可吸入颗粒物浓度影响因素,建立了关于颗粒物浓度的模型,求出其分析解,并提出"颗粒物浓度准稳定时间"因子作为反映房间颗粒物浓度衰减速度的参数.基于该模型的解析结果,发现换气量是通风时对房间颗粒浓度最重要的影响因素.在一间地板送风全比例模型房间内进行了实验,实验验证了所建立的模型能正确有效地预测可吸入颗粒物浓度的变化.结果表明:加大换气量可以使地板送风空调系统室内可吸入颗粒物浓度降低且颗粒物浓度准稳定时间缩短.

Effect of Air Change Rate upon Indoor Inhalable Particles Concentration in Under-Floor Distribution System

The inhalable particles concentration level is an important inference factor for indoor air quality(IAQ).To investigate the IAQ of under-floor air supply system,this paper analyzed the factors affecting the indoor inhalable particles concentration(IPC) and developed a model of IPC in under-floor air distribution system to predict the particles concentration varying with time.A factor of 'quasi-steady time of IPC' was proposed as a parameter expressing the speed of indoor IPC decay and accessing the final level.Based on the model,we found the air change rate was the major factor affecting IPC.The model was proved to be effective by experiments in a model room.The results have shown that increased air change rate can decrease the IPC level and reduce quasi-steady time.