Test and analysis of branch air rate migration in dynamic distributed ventilation system

Tests the air rate of each branch of dynamic distributed ventilation system at different inlet static pressure. The results show that the air rate of branch fan increases with the increasing of branch inlet static pressure at the same fan speed, as well as the branch fan plays a role of hindering the air rate in some cases. Analyses this phenomenon, deduces a theoretical expression of the branch design air rate migration, and reveals that the factors affecting the air rate migration are the branch resistance characteristics, the branch fan performance and the branch inlet pressure ratio. Proposes a graphic analysis method of branch design air rate migration.