变流量空调冷水系统的分析和比较
Comparison and analysis for variable flow chilled water system
摘要：
合理地设计空调水系统是保证空调工程节能运行的关键。按照现行的设计规范及标准的要求，目前空调冷水系统基本采用末端设置两通阀的负荷侧变流量系统。结合工程设计实践，对冷水机组定流量、负荷侧变流量一级泵系统，冷水机组变流量一级泵系统，二级泵系统这3种常见的闭式空调冷水系统进行了分析比较，总结了各系统的特点、能耗情况及适用条件，提出了设计时应关注的主要问题。
Abstract：
Rational design of an air conditioning water system is the key to its energy-saving operation. According to the design standards and codes, a chilled water system with variable flow on the load side and two-way valves set at terminals is widely adopted. Based on engineering design practice, compares and analyses the three common closed air conditioning chilled water systems, i.e. the primary pump chilled water system with constant flow of the water chiller and variable flow on the load side, the primary pump chilled water system with variable flow of the water chiller, and the secondary pump chilled water system. Summarizes the characteristics, energy consumption and application conditions of each system, and points out the main problems deserving to be noticed in design.
Keywords:primary pump chilled water system, secondary pump chilled water system, pressure difference control, energy efficiency, pressure difference bypass valve, balance pipe