Simulation Of Variable Pressure Control Of VAV Air-Conditioning System Based On Simulink

Variable air volume (VAV) air-conditioning system is becoming the main steam of the whole air conditioning system in china and abroad because of its large energy conversation. But VAV system has many control circle, and demands more holistic control, specially there is many couplings among control circles, which affect the VAV system's stability, so it is hard to put VAV system into application in china. And moreover the pressure control circle is the most importance key to the VAV system's stability, and its controlling performance decides whether the system can work or not.Firstly this paper introduces control circles which VAV system needs. And then it particularly introduces three variable pressure control methods (minimum pressure control, VVVP air volume control, total air volume control). It evaluates the three methods by comparing and analyzing the three methods. And it chooses the minimum pressure control method to be the best method on energy saving ability and controlling performance in the three methods.This paper analyses the operation scheme of each part of VAV system, and establishes the Simulink models of the main part of VAV system. And then it use the Simulink models to build a VAV air-conditioning system emulational model. The hard-core of the emulational model is the air Pipeline network model, and every part of the VAV system is connected by the air Pipeline network model.It use the VAV air-conditioning system emulational model to simulate the running of a minimum pressure control emulational system of VAV air-conditioning in summer parameter. It can proves the validity of minimum pressure control to VAV system by analyzing the result of simulation.