Measurement research on relationship between air change rate and cleanliness for a large-space clean factory building

In order to reasonably determine the air change rate of large-space clean factory buildings, makes a measurement research on the relationship between the air change rate and cleanliness for a project. The results show that the average concentration of indoor suspended particle does not monotonously change with the air change rate. When the air change rate is less than nine times per hour, the impact of the air change rate on indoor suspended particle concentration is significant. When the air change rate varies from nine to fifteen times per hour, the impact is very small. The suspended particle concentration in operational conditions is usually three times of that in as-built conditions. For the large-space clean factory building with eight class cleanliness, the air change rate can be reduced to eight times per hour.