基于STM32的中央空調水控制系統(tǒng)的研究與實現(xiàn)
[Abstract]:At present, the state and enterprises pay more and more attention to building energy consumption, central air conditioning accounts for more than 60% of the building energy consumption, and water system is an important part of the central air conditioning system. Therefore, reducing the energy consumption of the central air conditioning water system will reduce the energy consumption of the whole building. The cooling water and freezing water in the existing central air conditioning water control system are usually controlled by the maximum design load, and the cooling tower fan is opened continuously in the cooling water cycle process, regardless of the weather and other factors. The control mode of floor branch system is simple, resulting in waste of energy, and in the course of freezing water cycle, the control algorithm of variable frequency speed regulation of frozen water pump is simple and the control effect is not satisfactory. Aiming at the deficiency of central air conditioning water control system, this paper studies the water control system of central air conditioning. The main work is as follows: (1) A distributed central air conditioning water control system with remote monitoring function based on STM32 is designed. And completed the hardware circuit design and PCB drawing and debugging, for the central air conditioning water control system to build a basic platform. The remote server is built and the remote monitoring interface of the central air conditioning water system is programmed by using the configuration software WINCC,. The remote server is connected with the core control board in the upper layer of the control system through Ethernet to realize the remote monitoring function. The whole control system is composed of three layers, the upper layer is the core control board, the middle layer is the cooling pump control board, the freezing pump control board, the cooling tower control board and the floor branch control board, and the lower layer is the field equipment such as water pump, sensor and so on. The core control board integrates the cooling water system with the refrigerated water system through the RS-485 circuit. According to the change of the central air-conditioning load, the speed of the pump is adjusted by frequency conversion, so as to adjust the cooling water and the chilled water flow. The control plate of cooling tower controls the start and stop of cooling tower fan according to the change of ambient temperature; The floor branch control panel changes branch valve opening according to the return water temperature of each branch, reduces energy waste and improves the comfort of indoor users. (2) Frozen water cycle is a nonlinear, time-varying and large lag complex process. Compared with the traditional PID algorithm, the new algorithm improves the real-time performance and control precision of the frozen water system simulated in Simulink by fuzzy PID algorithm. (3) the related experimental verification of the system is carried out. On the basis of testing each module of the hardware circuit of the system, the whole system is debugged. The experimental results show that the system works well, the energy-saving effect is good, and meets the design requirements.
【學位授予單位】:西安建筑科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TU83;TP273
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