Heating, ventilation, and air conditioning (HVAC) system is significant to the\nenergy efficiency in buildings. In this paper, temperature control of HVAC\nsystem is studied in winter operation season. The physical model of the zone,\nthe fan, the heating coil and sensor are built. HVAC is a non-linear, strong\ndisturbance and coupling system. Linear active-rejection-disturbance-control\nis an appreciate control algorithm which can adapt to less information,\nstrong-disturbance influence, and has relative-fixed structure and simple tuning\nprocess of the controller parameters. Active-rejection-disturbance-control of\nthe HVAC system is proposed. Simulation in Matlab/Simulink was done. Simulation\nresults show that linear active-rejection-disturbance-control was\nprior to PID and integral-fuzzy controllers in rising time, overshoot and response\ntime of step disturbance. The study can provide fundamental basis for\nthe control of the air-condition system with strong-disturbance and\nhigh-precision needed.
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