请教各位高手:我在运用PurchAir计算建筑空调系统负荷时,在没有新风的情况下可以正常运行,可是一加上新风(OutsideAir)就会出现以下错误和警告:** Warning ** PURCHASED AIR="SPACE1-1 PURCHASED AIR" has outside air specified. In PURCHASED AIR simulations,**~~~** the outside air flow may be limited by the supply air flow rate at low load conditions.(不懂) Do NOT use this option**~~~** for annual load comparisons.Instead, introduce outside air using INFILTRATION or VENTI.