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以CO2为示踪气体,采用干冰和人体呼吸产生CO2两种方法,在不同换气次数条件下测定了CO2浓度变化规律,建立了室内CO2浓度预测模型。由此得到存在门窗缝隙渗风时,室内人员处在正常工作状态下的室内外CO2浓度差与换气次数的函数关系,从而可算出最小换气次数。由实验可知,自然渗风时无人房间CO2浓度呈指数衰减;满足室内空气质量要求与节能要求的最小新风量为35m3/(人.h)。
CO2 as tracer gas, using dry ice and human body to produce CO2, two methods were used to measure the variation of CO2 concentration under different ventilation times, and the indoor CO2 concentration prediction model was established. The result shows that there is a gap between indoor and outdoor CO2 concentration difference and the number of ventilation when there is a seepage of windows and doors gap, the minimum number of ventilation can be calculated. It can be seen from the experiment that the CO2 concentration in the unoccupied room declines exponentially during natural seepage; the minimum fresh air volume meeting the requirements of indoor air quality and energy saving is 35m3 / (personh).