Understanding of ventilation rate based on ventilation effect

The nominal ventilation rate are normally applied to evaluation of the overall ventilation effect. However, it is difficult to perform effective evaluation by using this index because of the non-uniform characteristics of indoor environment. Demonstrates three ventilation indices, i.e. the nominal ventilation rate, effective ventilation rate and local ventilation rate from the actual ventilation effect angle, and indicates their difference with a case study. Suggests that the effective ventilation rate, in place of nominal ventilation rate, be used to evaluate the overall ventilation effect while local net flow rate and local ventilation rate be used to evaluate the local ventilation effect.