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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。
It is pointed out that the mechanical part and the electrical part of the VAV apparatus are usually produced by different enterprises and therefore may result in incomplete matching between the two parts. This paper introduces the definition of the air volume calculation coefficient Kv used by the VAV controller in the variable air volume terminal device to calculate the air volume, and the test device and method for obtaining the air volume calculation coefficient. The reason why there is a difference between different VAV controller air volume calculation coefficients Kv is analyzed for the same VAV terminal box. By analyzing the influence of air pressure on the control accuracy of VAV system, it is found that the lower the air pressure is, the lower the effective opening degree of air valve is.