Analyzing the performance curves of pumps and network in a variable flow pumping system , concluding the influence factors of energy saving and the optimal ranges of variable frequency drive ( vfd ) 摘要通過分析變頻水泵及管網(wǎng)系統(tǒng)在變工況下的特性曲線,得出影響水泵變頻節(jié)能效果的主要因素和變頻調(diào)速的適用范圍。