The Design Of Central Ground Temperature Air-conditioning System And Its Control Algorithm’s Study

Today increasing people’s living standards and technological advances,air conditioning has become an essential part of life. while the air conditioning system to bring energy issues have become increasingly serious. Geothermal central air conditioning is followed by development of a new generation of central heating and air conditioning equipment with energy saving, environmental protection, and low running costs, the vigorous development in recent years. Paper designed for embedded geothermal central air conditioning system based on field bus. The main work includes:1References to read through a lot of geothermal central air conditioning system related learned geothermal central air conditioning system with hysteresis, non-linearity, large inertia, precise mathematical model and other issues. Because of these problems, resulting in poor control effect of conventional control algorithms, in order to improve the performance of the control system, using a new algorithm with the conventional algorithm combines intelligent algorithms.2paper uses a conventional PID, fuzzy and intelligent sampling theory combines intelligent control algorithm, completed the geothermal central air conditioning indoor air circulation system for smart sampling fuzzy PID controller design. Conventional PID module as the main control module, fuzzy and intelligent sampling module to overcome the effects of large inertia and time delay of the system. And through Matlab/Simulink simulation.3paper uses developed on the basis of fuzzy control on the behavior of self-tuning fuzzy control algorithm, completed the design of chilled water circulation system for smart controller. For a classic fuzzy controller has been designed, because of its control rules is not perfect, when the internal parameters of the system when major changes occur, the control effect will be worse. Adding a part of the paper, and a performance measurement control amount correction link, the amount of the correction control amount output from the fuzzy controller and the original superimposed together to form a new control amount, so that a good control effect is improved.4paper also uses a geothermal central air conditioning for cooling water circulation system designed internal model controller. For large delay controlled object, analyze the robustness of the model controller, given the stabilization of an unstable feedback loop object parameter setting range. And using matlab/simulink tools adapted to the situation of the three models were simulated, the simulation results show that the algorithm is simple and effective.5paper gives the design of the network control system, the system has been specifically designed hardware and software. Hardware platform S3C2440ARM9core system on chip, embedded Linux software platform for collecting temperature signal with a given comparison, as well as calculate the output control signals, etc. signals via CAN bus control signals to the final the end of the fan module, changing air volume, and ultimately the indoor temperature control and to save energy. Controller reserved Ethernet interface, which enables remote monitoring capabilities.