区域型三级泵直供系统设计关键问题探讨（1）：水泵选型扬程确定方法与耗电输冷（热）比计算
Discussion on key issues of primary-secondary-tertiary pumping system design（1）—Head selection of pump and EC(H)R calculation
摘要：
从用户侧支管与区域输配干管的连接形式上，将区域型三级泵直供系统分为解耦式与非解耦式2类。对于2类不同的形式、区域输配管网侧压差控制点数量、压差控制点与用户之间的相对位置关系，分类给出了二级泵与三级泵选型扬程的确定方法。针对非解耦式区域型三级泵直供系统给出了7个算例的实际计算选型结果，并提出了该类系统的定压设计要点。基于解耦式与非解耦式系统水泵选型扬程确定方法，探讨了2类系统耗电输冷（热）比计算的环路选取与水泵扬程取值原则。
Abstract：
The primary-secondary-tertiary pumping system is divided into two types: decoupled system and non-decoupled system, according to the connection form between the user side branch pipe and the district distribution pipe. Based on the two system types, the number of differential pressure control points, and the relative position relationship between the differential pressure control point and the user side, classifies and determines the head selection of the secondary pump and the tertiary pump. Gives the actual calculation and selection results of seven cases for the non-decoupled primary-secondary-tertiary pumping system and proposes the key points for constant pressure design. Based on the determination method of pump head selection for the decoupled and non-decoupled systems, discusses the principle of loop selecting and pump head selection for calculating EC(H)R of the two type systems.
Keywords:primary-secondary-tertiary pumping system, decoupled system, non-decoupled system, head selection of pump, electricity consumption to transferred cooling or heat quantity ratio (EC(H)R)