Relationship between Outdoor and Indoor PM10, PM2.5 and PM1 in Apartment and Office Buildings

The indoor air quality is directly affected by particulate matters(PM).In this study the concentration of indoor and outdoor particles of an apartment and an office were measured.The effect of the concentration of outdoor particles on the concentration of indoor particles was analyzed.The results demonstrate that concentration of indoor and outdoor particles has 2-3 peak points during one day.The indoor to outdoor ratio increases as the size of particles decreases,which indicates that the fine particles penetrate through the building envelopes more easily.The concentration of indoor particles is closely correlated with the concentration of outdoor particles,and the correlation increases as the size of particles decreases.     

铁路空调客车气流组织评价

基于k-ε两方程模型，利用PHOENICS软件，在实验检验的基础上对列车车厢空调各种气流组织方式进行了模拟，并对其舒适性及经济性进行了评价．结果发现：传统的车顶条缝送风及格栅送风为较好的送风方式；椅背送风由于其独特的优点可推广应用；小桌下送风由于很难达到舒适要求不宜采纳．     

温湿度变化对室内甲醛体积分数影响的实验研究

甲醛是影响人体健康的室内主要污染物之一，正确测量室内甲醛体积分数很重要。室内甲醛体积分数在很大程度上受室内温度和湿度的影响。实验结果表明．甲醛体积分数单独受温度或相对湿度影响时，呈指数上升的趋势。当温湿度同时变化时，甲醛体积分数受温度的影响要大些。实验结果不但可为甲醛体积分数的测量提供参考，而且为了有效降低室内甲醛体积分数，可考虑在人体热舒适范围保持较低的室内温度和相对湿度。     

Experimental Study of a Photocatalytic Reactor for Trace Formaldehyde Removal

Formaldehyde is the key contaminant influencing building occupants＇ health in indoor environment. In order to reduce occupants＇ exposures to formaldehyde, a newly designed photocatalytic reactor was applied in a dynamic HVAC （heating, ventilation and air conditioning） system. The experiments were carried out for the removal of formaldehyde present in air at low parts per million （ppm） concentrations. The initial formaldehyde concentrations were set as 1.59 ppm and 0.27 ppm respectively, based on the formaldehyde levels in the polluted places. Experimental results show that the photocatalytic reactor is effective on formaldehyde photodegradation, causes a low pressure drop, and does not make the second pollution of ozone. The kinetic anaiysis indicates that the kinetics for oxidation processes can be fitted well by a pseudo-first-order kinetic model deduced from Langmuir - Hinshelwood （L-H） model.