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摘要 从实例中旁通管逆流的现象出发，说明了末端侧冷水大流量小温差不仅影响冷水侧输送效率，且会对冷水机组运行造成不利影响。大流量小温差现象根源在于末端的不合理需求与水系统的过度供给，在改造时应从末端和压差设定点控制两方面入手。以实际工程为例，说明了水系统诊断与改造的全过程与实际的改造效果。 关键词 水系统 小温差 冷水机组群控 节能改造 Case study on HVAC energy efficient optimization and renovation（Part II）: Chilled water system By Chang Cheng, Wei Qingpeng, Cai Hongwu, Xie Junjun, Chan Cary, Wu Michael and Chan Jason Abstract Starts with the occurrence of backflow in by?pass pipe in a case, illustrates that chilled water of large flow rate and small temperature difference in user side not only affects the chilled water transporting efficiency, but also adversely affects the chillers operation. The problem is attributed to the irrational designed demand of terminals and over supply by chilled water system. Both of the terminals and chilled water system differential pressure set points should be optimized in renovation. With an actual example, presents the process of chilled water system diagnosis and renovation and its energy saving effect. Keywords chilled water system, small temperature difference, chiller group control, energy efficient reform