Design And Application Of VAV Air Conditioning Control System

The paper designs and implements the control system of the VAV air conditioning system in the Production Despatch Buiding for The Power Supply Bureau in Xi'an. This project is the first VAV air conditioning control system engineering in the northwest region of China.To contrast with the distributed control system which used for Buiding Control, consider the characteristics of the VAV air conditioning system in the Production Despatch Buiding, the Apogee system of Siemens was adopted as platform. And basing on this platform, The hardware and software of Distributed Control System for VAV air conditioning system were designed.The core of the VAV air conditioning control system is to choose the energy-saving and engineering-oriented control algorithm. By comparing VAV terminal with VAV AHU,the pressure independent control algorithm was selected for the variable air volume terminal, and the constant static pressure control algorithm for the VAV air conditioning control AHU. Especially considering the disadvantages of the constant static pressure algorithm, namely,big-noise and bad energy-saving, the author achieved satisfied energy-saving result by optimizing control parameter. At the same time, the thought of the comfortable control was advanced firstly by author, which further raises the effect of energy-saving.Combined inspection and acceptance of this control system was passed by Power Supply Bureau of Xi'an and electronic association of Shaan'xi province. They evaluated that the VAV air conditioning control system is a safe, reliable, and that the control precept is advanced, rational, moreover, the effect of energy-saving is outstanding. The constant static pressure control algorithm raise 7% in energy-saving by optimizing control parameter. Further more, all index attained and part of the index exceeded the design request.The whole function came to the domestic advanced level. In addition, the project acquired one hundred classical intelligent building title, orgnized by the China Exploxiton & Design Association throughout the country.