求 ACH:Q=300 m³/h,V=60 m³ → n=5.0 ACH,净化至 1% 需 0.92 h Q=300 m³/h,V=60 m³。n=Q/V=300/60=5.0 1/h。净化至 ε=0.01:t=−ln(0.01)/5=0.921 h≈55.3 min。{"result":"ACH (mode=ach). Q=300 m³/h (300.0000), V=60 m³ → n=5 ACH. Purge to 1%: t=0.9210 h (55.26 min).","metadata":{"input":{"mode":"ach","flowRate":300,"flowUnit":"m3/h","volume":60,"volumeUnit":"m3","purgeFraction":0.01},"result":{"ACH":5,"Q_m3_h":300,"V_m3":60,"purgeFraction":0.01,"purgeTime_h":0.921,"purgeTime_min":55.26,"mode":"ach"}}}
求风量:n=6 ACH,V=2000 ft³ → Q≈200 CFM V=2000 ft³=56.634 m³。n=6 1/h → Q_m3h=6·56.634=339.8 m³/h。换算 CFM:Q_CFM=339.8/1.699≈200.0 CFM(以代码为准)。{"result":"ACH (mode=flow). n=6 ACH, V=2000 ft³ (56.6337 m³) → Q=200 CFM (339.8024 m³/h). Purge to 1%: t=0.7675 h (46.05 min).","metadata":{"input":{"mode":"flow","ach":6,"flowUnit":"CFM","volume":2000,"volumeUnit":"ft3","purgeFraction":0.01},"result":{"ACH":6,"Q_inputUnit":200,"Q_m3_h":339.8024,"V_m3":56.6337,"purgeFraction":0.01,"purgeTime_h":0.7675,"purgeTime_min":46.05,"mode":"flow"}}}