Ventilation system airflow dynamics

Abstract

Ventilation system airways comprising ducting and ventilation shafts of various lengths and diameters are considered. Conventional modelling methods for these systems, for automatic control purposes are commented upon. Analytical techniques which combine the distributed and relatively lumped parameter properties, of spatially dispersed systems, are introduced. General, distributed, and lumped realizations and structures are devised for the components, for typical ventilation system configurations. The formulation of multivariable, integrated, distributed parameter, hybrid models, for spatially dispersed ventilation systems comprising the transmission, energy storage, and dissipation elements, are proposed. Transfer function derivation methods enabling the airflow transients, at strategic system locations to be predicted, are presented. Typical application studies are outlined.