A new approach to heat-exchanger control based on model control

Abstract. Heat exchangers are widely used in air conditioning and ventilation. They are important equipments to obtain certain temperature and comfortable environment. When air conditioning works in transient process, the heat ex-changers need to be controlled to adapt the change. Strict process requirement ensures objective fluid with shortest dynamic adjustment time and with mini-mum controlled variable wave. The common control method in heat exchanger, PID feedback control, can not produce high control quality because of time de-lay and over-adjustment. So a new approach is presented here to overcome above shortage. A mathematics model is investigated to provide adjustment parameter, then a model-control method is put forward by introducing the feed-forward controller. Experiments are done to study model control method, considering the inlet flow rate or temperature disturbance occurs, or these two parameters change simultaneously. Key Words. Heat Exchanger, model-control, air conditioning and ventilation. 1