Research On Room Temperature Control Strategy For Central Heating System

Good heating room temperature control is not only the primary means of energy conservat-ion, but also raise the quality of the living environment. To adapt urban district heating househo-ld metering system and to improve user awareness of energy conservation, the study of heating room temperature control strategy is necessary. Basing on the related theory of heat transfer, build room temperature control model of heating room, which mainly includes indoor air dyna-mic process sub-model, radiator dynamic process sub-model and the thermostatic valve temper-ature sensor dynamic process sub-model. The transfer function of heating room temperature is determined through the experimental data.For large inertia, large hysteresis, time-variability and uncertainty of the heating systems, proposes the three methods of the room temperature control,which is the PID controller, the DMC control system and DMC-PID cascade control system. Through simulating and analysisin-g its control performance, the DMC-PID cascade control is26%less than the DMC control syst-em and is35%less than the PID controller in overshoot, is20%faster than the DMC control sy-stem and84%faster than the PID controller in response time.In this paper, DMC-PID cascade control is proposed in temperature control strategy, which combines the strong ant i-inter ference ability of the PID controller and the strong tracking perfor-mance advantages of the DMC control, has a good controlled quality for heating indoor temper-ature in the tracking, interference and robustness.It opens up a new way for the design of indoor temperature control of the heating system and has broad application prospects in the entire distr-ict heating network.