The dynamics of cyclic ventilation systems

Ventilation and air conditioning modelling methods, for large scale, spatially dispersed systems are considered. The limitations of existing techniques are discussed and proposals for the application of novel analysis approaches are outlined. The use of hybrid, distributed–lumped parameter procedures enabling the incorporation of the relatively concentrated and significantly dispersed, system elements, is advocated. A dynamic model for a ventilation arrangement comprising inlet and exhaust fans, with filtered air re-circulation and air conditioning units is presented. Pressure, flow and temperature predictions within the system are computed following input and disturbance changes. The employment of the model for automatic, multivariable controller design purposes is commented upon.