室内有害气体的通风净化效应

Purification effect of indoor harmful gas with ventilation

室内装修材料和家具释放的有害气体严重恶化了室内空气品质,其中甲醛对人体危害尤为突出,而室内通风是清除甲醛行之有效的办法。测试了室内甲醛释放源的释放强度规律,并建立了新装修室内甲醛通风净化的空气动力学模型,数值计算分析了通风情况下室内甲醛的浓度分布特征。结果表明:(1)室内地板和家具的甲醛释放强度均随测试时间呈指数减小;(2)同一通风风速下,装修后第30天时的甲醛浓度较大区域明显减少;(3)在室内人坐姿和站姿呼吸高度(约1.2、1.7m)处,无论风速大小,装修后通风一段时间后室内甲醛浓度均减小,且较低位置(1.2m)甲醛浓度减小更明显;(4)在同种气流组织形式下,较小和较大的通风风速对室内甲醛通风净化效果均不理想,对本研究模型而言,以通风风速2m/s左右时对室内甲醛净化效果较好。

Indoor decoration materials and furniture release harmful gases which deteriorate the indoor air quality seriously. The harm of Formaldehyde on the human body is particularly prominent, and indoor ventilation is the most effective way to clear formaldehyde. As such,the strength release laws of indoor formaldehyde were tested for different emission sources,and air dynamics model of the formaldehyde ventilation purifying was established to numerically analyze the distribution characteristics of indoor formaldehyde under the condition of ventilation in newly installed indoor. The results showed that.. （1） the formaldehyde release strength of indoor flooring and furniture decreased exponentially with time. （2） Under the same ventilation speed, the area, which the formaldehyde concentration was larger, decreased significantly on the thirtieth day after the decoration finishing. （3） When people siting and standing,their breathing height were about 1.2 m and 1.7 re,and at these heights the formaldehyde concentration decreased after a period of time of indoor ventilation with any wind speed,especially in lower area （1.2 m） the formaldehyde concentration change was more obvious. （4） In the same airflow form, the smaller or bigger ventilation speeds had not obviously effective on formaldehyde ventilation purifying. The wind speed at 2 m/s had a better effective on formaldehyde ventilation purifying as for the model in this paper.