Study On The Terminal Controller Of VAV Central Air-conditioning System

Because of the promoting energy saving movement,VAV Central Air-conditioning as the important elements of the intelligent building shows its clean and energy saving advantages.However,in application,because of its complex and special features,most of the VAV conditioning system can not arrive the expectant control effect and energy saving target,which causes the cost rising and energy waste.Research on control algorism of VAV conditioning system is the hot issue in engineering territory.VAV conditioning terminal system is the key part of the whole VAV conditioning system,through which to adjust the supply air volume,compensate the variable in-door load and maintain the room temperature.This paper is based on VAV conditioning laboratory in Xi'an University of Architecture and Technology and carry on intensive study on VAV conditioning terminal system.Based on experiment,build the mathematical model of the VAV conditioning terminal system.Meanwhile,according to the model,design the suitable controller with PID and Fuzzy algorism,which tested good performance of the PID compared with the Fuzzy algorism.Finally,adopt embedded ARM,research its hardware structure,apply it on VAV terminal controller, and debug its communication function with industrial computers in the laboratory, which primarily realize the independent control,real-time data exchanging function controller of VAV conditioning terminal system.