The Applied Reseach Of VAV Intelligent Control Of Ground Source Centralair-conditioning System

As energy-hungry air conditioning, widely used in daily life. In today’s era of energysaving advocate, Strategies to control energy-saving air-conditioning system have obviouseconomic sense. Ground source central air-conditioning based on zero emissions, highthermal efficiency, low prices and other advantages, becomes popular in many currentcountries of the world. Making full use of underground water sources, it reduces energyconsumption, Using pressure-independent regulation mode in the air-conditioned terminaland varying the air flow to satisfy air load Using variable air volume control haseffectively achieved the energy saving effect.Air-conditioning system uses network control, Based on Siemens profibus fieldbustechnology, Put forward network geothermal air conditioning system, Increase systemreliability, Simple operation.achieve multi-machine networking. So that it highlightsintelligent. Master uses Siemens PLC. Slave uses LETC. Between master and slavestations, it uses PROFIBUS-DP. Between the main station and the host computer, it usesMPI. Monitoring software uses WINCC. In hardware designing, it collects signal, analysisdevice model and completes the module selection; software design flow chart. simulationfuzzy intelligent control algorithm in the laboratory.In VAV room temperature control system, for time-varying temperature, high inertia,linearity, hysteresis and other issues. This paper has designed adaptive fuzzy PIDcontroller, Smith Predictor controller, and finally a combination of two control algorithms,Modified Smith predictor Intelligent Controller solves the temperature hysteresis, variableparameter instability problems and overcomes the mismatch vulnerable to outsideinterference and other issues. Simulation studies show. System has fast dynamic response,good stabilizing effect, strong adaptability. Simulate the operation of the temperaturecontrol to achieve a better control effect in the laboratory. It is a useful exploration forenergy saving in the field of intelligent building.