论文部分内容阅读
目的探索集中空调通风系统对公共场所室内PM_(2.5)浓度的改善效果及其影响因素。方法选取11家设置和6家未设置集中空调通风系统(对照组)的公共场所经营单位作为监测点,利用问卷调查收集基础资料,每周对其室内外PM_(2.5)浓度进行监测,通过非参数检验等方法分析集中空调对室内PM_(2.5)浓度水平的影响。结果设置集中空调通风系统室内相对室外PM_(2.5)浓度平均减少值优于对照组(Mann-Whitney U检验,P=0.021);不同距上次清洗时长组间PM_(2.5)浓度平均减少值存在差异(Z=18.770,P=0.016);中效新风口滤网对降低室内PM_(2.5)浓度比初效滤网能起到更优的效果(Z=-3.354,P=0.001);不同组间新风口滤网清洗频率在降低室内PM_(2.5)浓度的作用上存在差异(Z=14.167,P=0.007),每2个月清洗1次的频率最佳。结论合理使用集中空调通风系统,定期清洗、使用更高过滤等级的滤网并保持最佳清洗频率能有效降低室内PM_(2.5)浓度,有助于改善室内空气质量。
Objective To explore the effect of central air conditioning and ventilation system on indoor PM 2.5 concentration in public places and its influencing factors. Methods Eleven settings and six public places business units without centralized HVAC system (control group) were selected as the monitoring points. The basic data were collected by questionnaire and the indoor and outdoor concentrations of PM 2.5 were monitored weekly. Parameter test and other methods to analyze the concentration of indoor air conditioning PM_ (2.5) concentration levels. Results The average indoor PM_ (2.5) concentration reduction of central air conditioning and ventilation system was better than that of control group (Mann-Whitney U test, P = 0.021). The average reduction of PM 2.5 concentration (Z = 18.770, P = 0.016). The medium effect fresh air outlet filter could reduce the concentration of indoor PM_ (2.5) more effectively than the primary filter (Z = -3.354, P = 0.001) The fresh air filter cleaning frequency has the difference in decreasing indoor PM 2.5 concentration (Z = 14.167, P = 0.007), and the frequency of cleaning once every 2 months is the best. Conclusion Reasonable use of central air conditioning and ventilation system, regular cleaning, the use of higher filter grade filter and maintain the best cleaning frequency can effectively reduce the concentration of indoor PM_ (2.5), help to improve the indoor air quality.