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Shopping central air conditioning energy saving control model of water system


Enough, the use of the complementarity of the two models shown in Figure 8 to establish energy-efficient models. The energy-saving control system for the importation of 3: 1) water supply and return water temperature; 2) the flow of people; 3) outdoor temperature. Cold-based fuzzy control of supply and demand model of demand forecast of cold, cold water to make up for the return water temperature PID based on models of delay phenomenon. Turn on water supply and return water temperature with a model of closed-loop PID control to compensate for cold supply and demand model based on fuzzy control model of the drawbacks of open-loop. The model is a cold-water pumps for the control model,[link widoczny dla zalogowanych], is only part of energy-saving control system. For part of the cooling water, can also use the above model, only part of the fuzzy control to make some changes. Part of the cooling water circulation system, is to receive cold water circulating cooling water to pass over the Figure 9 symposium fuzzy control block diagram of heat exchange heat with the external environment affecting the heat exchange element is the outdoor temperature. Therefore, there is only one part of the fuzzy control input of an outdoor temperature, obtained by the MATLAB toolbox structure fuzzy control block diagram shown in Figure 9. Other ways of fuzzy control processing described above, not repeat them. In addition, refrigeration unit is a direct provider of cooling capacity, cooling capacity according to demand computing platform off of which 1 or 2 refrigeration unit,[link widoczny dla zalogowanych], refrigeration unit in order to achieve energy-saving control. However, the control of refrigeration units should avoid frequent start-off,[link widoczny dla zalogowanych], cooling capacity needed on demand as a yardstick. Assuming the model to achieve the most energy efficient, that is the case in the temperature-stable, cold water and cooling water supply and return water temperature is 5 ℃. When the cold water supply and return water temperature difference between the original mean of 3 ℃, the cooling water supply and return water temperature mean 4cc,[link widoczny dla zalogowanych], pump energy-saving control of space up to (5-3) ÷ 3 × 100% = 66.6%, space cooling water pump energy saving control up to (5-4) ÷ 4 × 100%: 25%. 4 Conclusion In this paper, shopping for energy-saving central air conditioning water system analysis, the combination of PID and fuzzy control model to analyze the advantages of the model and simulation using MATLAB, the results obtained fuzzy control, to provide for the energy saving control a new idea. References: [1] Liang Chunsheng. Variable flow control central air conditioning energy saving technology [M】. Beijing: Electronic Industry Press, 20O5. [2] Zhu Jing, Sun Liufang. Principles and Applications of Fuzzy Control [M1. Beijing: Mechanical Industry Press, 1999. [3] Dong Lin. Detailed use MATLAB [M]. Beijing: Science Press, 2o0 Received: 2OO8-12-29 Revised: 2Oo9-03-17Research0nEnergy-saVingC0ntrOlM0del0fShOppingMallsC0ncentratedAirC0nditi0ningWaterSystemHONGXiao-ju conditioningwatersysteminexistingsh0pmalls, wastage0fenergywascomm0nbecause0fexcessivewatern0w.Inthepaper, energysavingcontrolmeth0dsonthewatern0wwerediscussed, advantagesanddisadvantagesofPII) contr0lm0de1flaeinginletandoutletwatertemperatureandfluzzyc0ntrolmodelflacingheatloadwereanalyzed.Thenanewmodelcombiningwiththesetw0modelswasproposed.Itprovidedanewideaf_0rtheenergysavingc0ntr01.Keyw0rds: concentratedair-c0nditi0ning; energysaving; PID; fluzzyc0ntrol Author: Hong Xiaojun (1974 a),[link widoczny dla zalogowanych], male, Fujian, lecturer, teaching mainly in the refrigeration and air conditioning. 4I

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