Discharge air system: Modelling and optimal control

A state-space model of a discharge air system (DAS) is developed. Simulatio n results obtained from the developed model compare well with the published experimental data. The optimal control strategies and optimal performance of DAS to step chang es in setpoints are given for two cases: a heating case with temperature co ntrol, and a cooling case with temperature and humidity control. Results sh ow that the outputs (discharge air temperature and humidity ratio) of the s ystem reach the chosen setpoints rapidly and smoothly compared with that of PI control results published in the literature. Copyright (C) 1999 John Wi ley & Sons, Ltd.