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摘 要 ：动力分散系统由于主循环泵不承担系统循环的全部动力，所以系统中必然存在一个零压差点。运用水压图对零压差点进行分析，得到如下结论：零压差点必须在临界点之前，才能使系统消除调节阀能耗，从而使系统的输送能耗最低。零压差点在临界点之前的不同位置，水泵的配置方案不同，但水泵的输出总功率是相同的。运用水压图可以方便地确定动力分散系统的零压差点以及水泵扬程的匹配方案。 关键词 ：零压差点 临界点 水压图 水泵扬程 Analysis of the Zero-pressure Point and Determination of the Pump Lift In Separate Power Systems Jiao Yang Fu Yongzheng Wuhan University of Science ＆ Technology,Wuhan,China Abstract: In separate power system there inevitably has a zero-pressure point, because the main circulation pump does not undertake the complete power. Using the pressure diagram to analyse the zero-pressure point, obtain the following conclusion: In the separate power system the zero-pressure point must before the critical point, which can cause the system to eliminate the regulating valve energy consumption, and causes the system transportation energy consumption to be lowest. The zero-pressure point at the different position before the critical point, pump disposition plan are almost different, but pump output total power are the same. using the pressure diagram can conveniently determine the zero-pressure point of the separate power system as well as the lift of pump. Key word : zero-pressure point critical point pressure diagram pump lift 参考文献 [1] 鞠硕华，张鹏，李鹏，方修睦.循环水泵节能问题.暖通空调，2008，38（11）：65-68 [2] 符永正，李玲玲，周传辉.动力分散系统中水泵扬程的匹配[J].暖通空调，2008，38（12）：12-21