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Fuzzy-PID Controller Applied to a Refrigeration System
JONES ERNI SCHMITZ,FLAVIO VASCONCELOS DA SILVA,ANA MARIA FRATTINI FILETI,LINCOLN CAMARGO NEVES FILHO,VIVALDO SILVEIRA JÚNIOR§ 대한설비공학회 2012 International Journal of Air-Conditioning and Refr Vol.20 No.2
A refrigeration system exhibits a dynamic behavior on which the variables are interdependent and subjected to oscillation, hence, implicating necessity of changes on operating conditions and undesirable energy expenses. These characteristics ratify the importance of adequate dimensioning and equipment selection to ¯nd pre-de¯ned operating conditions such as, the maximum cooling capacity and the evaporating and condensing temperatures. The application of fuzzy control in industrial processes is growing fast in the last decades, mainly in processes whose ¯rst principle models require complex methods to be simulated. In these cases, the fuzzy controllers'capacity of acting correctly based only on expert knowledge and on the capacity of inter-relating all the variables of the process are attractive features. This work presents the experimental development and evaluation of fuzzy-PID controllers for the maintenance of the evaporating temperature in a chiller. The system was submitted to load and set-point disturbances accomplishing an analysis based upon error parameters and transient response. The results showed that fuzzy controllers were adapted satisfactorily.
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