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摘要： 介绍了区域供冷系统二次管网的冷量损失及冷量损失导致的温升的计算方法，并对某个二次泵变流量运行的区域供冷系统进行了计算。结果表明，在保温材料达到要求、施工合格的情况下，区域供冷系统二次管网的总冷量损失很小，在其输送冷量的1％以内；二次泵的冷量损失是二次管网总冷量损失的主要影响因素；二次管网最不利环路上冷量损失导致的温升不会对区域供冷系统的用户造成大的影响；负荷率对二次管网的总冷量损失、最不利环路上冷量损失导致的温升均有较大的影响。 关键词： 二次管网　二次泵 直埋管 冷量损失 Cooling loss of the secondary piping network in district cooling system By Kang Yingzi★ and Zuo Zheng Abstract Presents the calculation method of cooling loss and temperature rising caused by cooling loss of the variable water flow secondary piping network in district cooling system ( DCS ).A calculation result shows that when the heat insulating materials satisfy the specified requirements and constructed adquately, the cooling loss of the secondary piping network in DCS is less than 1％ of its conveying cooling energy, the cooling loss of the secondary pump is the key factor in the total cooling loss, and the temperature rising caused by the cooling loss can not obviously influence the user in DCS. It also indicates that the cooling load ratio affects the cooling loss and its temperature rising remarkably. Keywords secondary piping network, secondary pump, direct buried pipe, cooling loss