Research And Design Of Non-Stationary CO₂ Density Control System For Terminal

Excessive CO₂ density is one of the main reasons for poor air quality.CO₂ density is non-stationary with passengers’ number changing in terminal,which brings challenge for CO₂ control system.A CO₂ control system based on data-driven PID controller is designed and developed,in which PID parameters are on-line adjusted by analyzing environmental data changes,such as fresh air volume and CO₂ density.Experimental and simulations’ results show that the system controls CO₂ effectively and stably by optimizing parameters online.The system provides good air quality for passengers with efficient energy conservation.Main researches are as follows:Firstly,according to the actual environment of terminal,system’s key functions include CO₂ detection,monitoring and fresh air volume adjustment.CO₂ control system scheme is designed with key functions and technical specifications by targeting system control aims.CO₂ detector,monitoring software and air-flow subsystem are developed and tested during the system development stage.The system and its components’ performance tests have achieved the anticipant targets.Secondly,the system is installed in laboratory.Six groups of designed tests are applied to test the system performance.Tests reveal that the data-driven PID controller system performs with significant advancement in comparison to the traditional controllers.Finally,system application scheme is designed according to the layout characteristics of air conditioning and ventilation system.Departure hall is selected to apply CO₂ control system.CO₂ density data is detected and analyzed in terminal.Main influencing factors of CO₂ density are researched to build control system simulation model based on Matlab/Simulink platform.Results show that the system based on data-driven PID controller can control non-stationary CO₂ effectively and reduce energy consumption.Robustness test provides that system is stable.Then,application scheme in other areas is discussed to realize the overall design of CO₂ density control system in terminal.Conclusions,results of experiments and simulations indicate that the systemworks stably with high responding speed and low steady error rate.Its operation facilitates good indoor quality with more efficient energy conservation.