Design And Realization Of Variable Flux Control Equipment In Central Air-conditioner For Energy Saving

The application of the central air-conditioner system has been developed quickly with emerge of high buildings and intelligent mansion in our country. For more than 60 percentage of total buildings energy consumption used up in the central air-conditioner system, people are playing more attention to energy saving in the central air-conditioner system. Based on running on the mode of constant flux system is one of characteristics of traditional central air-conditioner system. The system design and method of equipment choosing in traditional central air-conditioner system accords with calculation method of the maximum cooling and heating load based on the buildings. But the building interior's request to cooling and heating load is in accordance with building external ambient temperature which is dynamic changes by season and day-night. So energy load request of the central air-conditioner system is dynamic changes. That is to say, that avaiable flux operating mode substitutes constant flux operating mode is an inevitable trend.Based on the analysis and comparison function of existing central air-conditioner control system for saving energy, has studied the working principle, realization function and features of it. Aiming at the problems such as system enormousness, multiple control parameters, complicated control method and application effect non-idealed, designes a central air-conditioner control equipment for saving energy which is more accurated and directly for realizing intelligent control in it. Energy saving controler is mainly part in this equipment, combining with pump frequency converter. By collecting temperature and pressure of water system, judges the changes of cooling load in central air-conditioner system. After the identification, calculation and decision by the controller, the output of controller used to control the chilled water pump and cooling water pump. So building's request cooling capacity match with provided cooling capacity by central air-conditioner system, and realizes the purpose of saving energy.In the first chapter, there is a summary of the background and significance of research, international and domestic status, and my main work.In the second chapter, based on the analysis principle of existing variable flux central air-conditioner, a general design of variable flux control equipment in central air-conditioner for energy saving is determined. The third chapter in detail introduced hardware design of variable flux control control in central air-conditioner for energy saving. In the fourth part, in detail introduced software realization method of controller. In the fifth chapter, introduced a concrete realization method of the control equipment. The lase chapter, there is a summarization of this paper.