Research Of The Central Air-Conditioning Control System Based On Energy Optimization

The modern soeiety is facing more and more serious energy crisis, and the building energy saving has become more and more important. For many modern buildings, the central air-conditioner is an indispensable energy consumption system. When providing comfortable life and working environment for people, it has consumed a large amount of energy. According to relevant statistics, the building energy consumption in our country accounts for 30% of the total consumption of energy, in which the buildiing central air- conditioner accounts for about 70%, and growing up. Now, many buildings in our country adopt the air conditioning water system. In order to meet the requirement of energy saving, variable flow air conditioning water systems become the premier option of the engineers, and which has already achieved certain energy saving result in practice.The central air conditioning system is a Multi-Variable, Non-Linear, and time-varying system, so it is difficult to construct a precise mathematical model. And in the meantime, the applying of conditional PID controller will not get the ideal result. The fuzzy control expresses the control experience and knowledge of the operator or the expert into the control rule described by language variables, and then uses them to control the system. Therefore, fuzzy control can be easily used to resolve the control model problem of the central air-conditioning system. In the field of fuzzy control research, the traditional fuzzy control theory is already very completed and has been extended into many kinds of self-adoptive and self-adjusting methods. According to the main characteristics of the central air-conditioning water system, an improved self-adaptive fuzzy control method based on the quantification and proportionality factors was seleeted. By comparing several other fuzzy control methods, we can see that this method can get better result. To take the central air conditioning system of one hotel in Nanchang for instance, it actually facilitates one kind of system in energy-conservation that the frequency conversion adopting the Programmable Logic Controllr (PLC) to combine together with frequency conversion technology adjusts the speed, and will adjust controlling the control system which introduces PLC fuzzily quantization factors by oneself, has studied and controlled the programming realization that the method combined above-mentioned fuzzily with inserting value operation. Make use of PLC proportionality and realize fuzzy control, namely keep PLC control system and control flexible, reliable, such charaeteristics as anti-interference ability is strong, have raised the intelligent degree of the control system of central air conditioner greatly.