Trouble Shooting And Energy-saving Operation System Of Central Air-conditioning

With the continuous development of technology and industrial automation, the using of industrial and comfortable central air-conditioning increased quickly. The refrigeration system get more and more complicated than before. As a result, the latency trouble points increased, it demands more ability in the system's trouble shooting. At present, the trouble shooting by manual work is no longer met the actual needs. so the computer aided trouble shooting technology gets more and more pop and gets much economic value by its widely used. This paper adopts the combined method including theory analysis and experiment validation to study the fault detection of chilly water set of single screw. Firstly, the dissertation analyzes the principle of refrigeration circulation of steam compression, analyzes the performance characteristic of refrigerator and gets the fault characteristics of chilly water set in theory. Nine faults including decreasing flux of cooling water and non-condense gas in set etc are simulated in the experiment part of the dissertation. Keep other factors constantly while simulate certain fault and keep simulated condition and real condition similar. Dispose the experiment data and select five internal parameters as the parameters of fault detection including evaporating temperature, condensing temperature etc from all the variables. Variation rule of one of the five parameters represents the one running state. So the five rules of fault detection form one rule of fault detection. According to the control theory knowledge of experts and control engineers and the experience of operators, a central air-conditioning real time trouble shooting software which base on expert system was programmed. The result shows this software can inspect the system's working state and get exactly troubles of the system. The paper also discusses the energy-saving operation system through inner parameter setting, multi-condition and water circulate system, and emphasizes the water circulate system's energy-saving control.