A Study Of Programs Of Traminal Regulated Air Volume In VAV System In Intelligent Buildings

With the development of national economy and improvement of the livingstandards of people, more and more buildings have used air conditioning systems.Because Variable Air Volume (VAV) can reduce equipment and systematic energyconsumption, it has been used in a large amount. Variable air volume system'soperating mode changes at any moment, so it must depend on automatic control toguarantee most basic request of air conditioning system. Continuous development ofthe technology of the computer and constant decline of the cost of hardware make thecomputer get extensive application in the field of HVAC.Thus, VAV and controlsystem combine closely and become an inalienable one. At present, the questions of the instability of the air conditioning system andinsufficient of fresh air are primary problems influencing the performance of VAVsystem. So, going on overall research to VAV system, giving air conditioningdesigner a set of intact design, control methods and systematized product alreadybecome a piece of extremely urgent thing. In the study of applied control program of VAV system, this paper analyzes atpresent several kinds of control methods adopted by air conditioning system: constantpressure control method, variable pressure control method, total air volume controlmethod. In addition, it has carried out analysis to several control methods. On thebase of analyzing the methods, I introduce the new concept of TRAV put forward byAmerican scholar T. B. Hartman, combining the feedback of terminal valve state,bring forward one kind of new control method:Terminal Regulated Air Volume tocontrol. Combining with the current control situations of VAV system in our countryand actual project,I adopt constant pressue control and terminal regulated control,study the control algorithm that is fit for implement for actual project, work out thepractical and feasible control procedures that can be applied in the actual project. The research object of subject is applied control procedure of VAV system, basedon the ALC's WebCTRL system. By utilizing ALC company's software and hardwareand combining with actual project, I design the automatic control VAV system and thesoftware, realize the whole course from installation to debugging.