The Study Of Variable Load Characteristic And Control Tecnique In Air Conditioning Water System

The application of the central air conditioning system has been developedquickly with emerge of high buildings and intelligent mansion in our country. At thesame time, people are paying more attention to the problem of consuming of centralair conditioning system. Besides the factor of the product quantity, the design and themanagement of running of the air conditioning water system effect mostly on the airconditioning system's usage result, running expenses and life span. With thedevelopment of variable frequency technique and the application of variablefrequency machine to the water pump, the variable air conditioning water system isthe first choice of the HVAC engineers. In practice, the variable air conditioningwater system has saved energy. But because whatever in designing or in running, thevariable water air conditioning system is more complicated than the normal airconditioning water system, professional pay more attention to the study of thevariable water air conditioning system.For an actual air conditioning system, the adjust action of each terminal keepindependence each other. Even if at the same time system load and flux are same,because of the difference of users load distributing, the water pump has differentrequirement of head in system. In air conditioning water system, the change anddifferent distributing of users load impact on systemic pipeline characteristic curve,and finally most affect control manners and control effect. Through setting up testingplatform of the variable air conditioning water system and date collecting system ofcomputer control, by analyze means of theory and experiments, research on thechange and different distributing of users load impacting on systemic pipelinecharacteristic curve and control curve, analyze and validate the possibility of controlzone. Finally, through the viewpoint of saving energy and feasibility, theoreticallypoint out that least resistance control and variable pressure control are more savingenergy and more feasible.