The Research In Control Characteristics Of Dynamic Flow Balancing Valve And The Applications In The Central Air Conditioning Water System

Hydraulic disorder is a common and difficult problem of the complex pipe network forfluid distribution, directly affect the working performance, and leads to the increase ofenergy consumption.And the dynamic flow balancing technique, whose hardcore is thedynamic flow balancing valve, makes full hydraulic equilibrium possible.Based on theresearch at home and abroad，this paper systematically analyzed the flow characteristics ofdynamic flow balance valve and dynamic control performance.When parallel of dynamicflow balance valves are used in multi branch network,interactions, regulation mechanism,control performance and energy consumption characteristics is investigated theoreticallyand experimentally. This paper presents an dynamic flow balance control mode for variableflow water system of central air conditioner system. the main work and conclusions are asfollows:（1）This paper takes theoretical research of the coupling mechanism of the dynamic flowbalance valve and pipe,and takes analysis of the mutual influence in multiple networkwhen parallel of dynamic flow balance valves are used. through computer simulation,multiple network traffic characteristics, control performance, energy consumption ofdifferent conditions was analyzed, and compared with the electric valve, automaticdifferential pressure control valve control mode. This paper also presents an morereasonable dynamic flow balance control model. the results show that this new controlmode can not only improve the precision of system flow, but also improve the efficiency ofequipment.（2）We use the advanced virtual instrument technology to build a multi-functional fluidtest bench, and take research of the dynamic flow balance valve flow characteristics andcontrol performance. In the variable flow water system the flow pipe network performanceare tested and analyzed. Under the dynamic flow balance control of network,the controlaccuracy, stability and efficiency of the water pump are experimental studied.（3）This paper also presents control mode for the variable flow water system of central airconditioner system, based on the application of adjustable dynamic flow balance valve,andrespectively analyse the ends of water systems, chilled water systems, cooling watersystem, a compared with the conventional control mode. it provides the academic basis ofoptimization design and application forthe central air conditioning water system.