Analysis to diagonal branches in a ventilating and air conditioning project for negative pressure isolation wards

Takes a ventilating and air conditioning project as an example, establishes the building ventilating network model,  judges all the diagonal branches and simulates the effect of the changes of branch resistance to the air volume. The results show that door and window branches are usually the diagonal branches in ventilating network model for isolation wards. Through analysis on diagonal branches, indicates that the air volume of an air conditioning system is irrelevant with the door and window branches resistance, while the main factor influencing pressure difference across the door and window is the air volume of connected air conditioning systems.