变风量系统末端装置的整定及其性能分析

Setting and performance analysis of VAV terminal units

指出变风量装置的机械部分与电气部分通常由不同企业生产,因此可能导致两部分不完全匹配。介绍了变风量末端装置中VAV控制器用于计算风量的风量计算系数Kv的定义及获取风量计算系数的测试装置、方法。分析了同一变风量末端装置的箱体,不同VAV控制器风量计算系数Kv之间存在差异的原因。通过分析送风压力的大小对变风量系统控制精度的影响,发现送风压力越小风阀有效开度的下限越高。

Points out that the mechanical and electrical components of the VAV unit arc generally from variant manufacturers, hence, the two components may not match each other completely. Presents the definition of air volume calculation coefficient （Kv） used to calculate the air volume for the controller in VAV terminal units and the testing device and method for obtaining the coefficient. Analyses the cause for the difference in Kv of different VAV controller for the same box. By means of analysing the impact of air supply pressure on the control precision of the VAV system, finds that the lower air pressure, the higher the lower limit of the effective VAV damper openings.