变风量空调系统送风管道静压特性的试验研究

摘要

为了解变风量系统静压控制过程,促使变风量空调运行更加稳定,本文参考水系统的水力特性,研究不同位置的末端阀门从开到关,风机频率从大到小的调节下,送风系统主管与支管的静压变化规律.结果表明:被调节支管前一个送风主管段在总送风主管上静压变化最剧烈,主管段静压变化规律与支管推导理论并不吻合;对称支管的静压改变值是否相等,只与被调节阀门位置有关,与风机转速、对称支管阻抗无关;在定管网阻抗,变风机频率时,管网中任意一点的静压值与风机频率呈现二次方抛物线关系.%To understand the process of VAV static pressure control and promote the stability for operation,according to hydraulic characteristics of water system,regulation of static pressure in main and branch pipe of air supply system was researched in experiment by controlling terminal valves in different position from on to off and descending the fan frequency.The results show that the main pipe before the changed branch changes most dramatically.The regulation of static pressure in main pipe does not match the one for branch.Whether or not the static pressure of the symmetric braches are equal depends on the location of changed terminal,not the fan speed or the resistance of symmetric branches.The relationship between static pressure of any point in pipe network and fan frequency is quadratic parabola when the resistance of network is fixed and fan frequency is changed.