The Energy Conservation Investigation On Fuzzy PID Control In The Water System Of Central Air Conditioner

In recent years, with the rapid development of economy, the consumption ofenergy is more and more big, and is one of the largest energy consumption, buildingenergy consumption of heating and air conditioning energy consumption accounts forabout60%~70%of building energy consumption. The central air conditioningenergy consumption generally consists of three parts, namely the energy consumptionof the air conditioning cold and heat source, water or air conveying system energyconsumption and energy consumption of equipment at the end of the air conditioningunit. In addition, the central air conditioning system is a typical multivariable,nonlinear and time-varying system, its control difficulty is higher. So the study ofcentral air conditioning system energy saving control strategy has become the controltheory and control engineering, especially one of the hot topics in the study ofintelligent architecture.Current adjustment methods of central air conditioning water system adoptingmainly the PID and the PID regulation performance depends largely on its parametersetting, due to large central air conditioning water system time constant, adjust notonly time-consuming, laborious performance cannot be satisfactory. As a result, thefuzzy control technology combined with classical PID control technology, realize thefuzzy self-tuning PID parameters online, to improve the central air conditioning watersystem control precision, stability and reliability, has considerable practicalsignificance.Comprehensive analysis in this paper, the central air conditioning water systemoperation principle and characteristic, and carries on the corresponding energyconsumption analysis and in view of the analysis of the present status of central airconditioning system control, fuzzy PID control scheme is determined, thecorresponding fuzzy controller is designed, using MATLAB software for thesimulation and performance analysis, and compared with conventional PID controlfeatures analysis, proved the rationality of the design system, to realize central air conditioning water system run efficiently, saving energy and reducing consumption.