Implement And Research On Fuzzy Control Technique Of Central Air-Condition System Based On H-D Chart

This thesis was Carried out based on the central air-condition temperature and humidity control system investigation project in a air control company in ChongQing. In order to complete the master degree, the author joins to this project and was responsible to the whole research and test. In the paper, based on the analyzing of the characters of air-condition system, the author emphases analyzed the Adaptive fuzzy control system, and applied the fuzzy control system to the system of central air-condition temperature and humidity successfully. As a result, a satisfying result was achieved. Paper first briefly introduces the development of fuzzy control theory and the base theory of fuzzy control system; next, the structure and the parameters of fuzzy control system are analyzed, meanwhile the stability analysis of fuzzy system was discussed. In the third chapter, it was first focused on the constitution of the wet air, also the basis introduction and the applications of h-d chart. It is most important to discuss the six air adjusted conditions. The adjusted course of the total conditions in the h-d chart was presented. It also sum up the classification and composition of the air-condition system, analyzes temperature-humidity dependence. Finally it analyzes the control characters of central air-condition control system; provide the mathematics model of the central air-condition system. H-d char was very important to the application of air-condition system. Writer introduces the definite method of the air state according to the h-d chart, and analyze the operating mode air changing course and corresponding treatment course of summer condition and winter condition based to the one wind system. Because of the problem of the enthalpy error control theory, writer expound a new theory——equal enthalpy control theory based on one wind system, and provide the explanation method and new computing method of new wind quality. Chapter 4 firstly analyzes the characteristic, the systematic structure, control principle of the fuzzy adaptive control system, model reference fuzzy adaptive control system etc., and recommend the comprehensive-analyzing design method. The thesis was detailed to discuss the choice of fuzzy variety of the central air condition control system of temperature and humidity, certain the grade of membership and the choice of fuzzy rules, certain fuzzy inference and fuzzy control table etc. To the design of the fuzzy adaptive organization, it was provided 112 control rules according to the expert's experience, provided the course that the adaptive organization revises the temperature fuzzy controller. Chapter 5 gives the emulation of the fuzzy control system of the temperature humidity of central air conditioner. It was discussed and analyzed the dynamic performance of the fuzzy control system and automatic adjustment ability to the perturbation. Results of study indicate that central air-condition temperature-humidity fuzzy control system have fine stability and energy-conserving result than traditional control system.