同程布置冷水系统管网水力特性计算机分析

摘要

以同程布置的冷水系统管网为研究对象,在充分考虑末端支路温度调节阀调节特性的基础上,建立了管网水力计算数学模型,提出了虚拟流量的计算机逻辑算法.以10个AHU支路的同程式管网为例,在所有末端支路水力可调、部分AHU关闭及部分AHU调节失灵3种情况下,分别计算了不同供回水压差下各支路温度调节阀的开度和实际流量,计算结果符合同程式管网的固有特性.%Taking a reverse-return chilled water system as the research object, based on full consideration of the regulating characteristics of temperature regulating valves in terminal branches, establishes a mathematical model of pipe network hydraulic characteristics, and puts forward a computer logic algorithm with virtual flow. Taking a reverse-return pipe network with ten AHU branches as the example, calculates the opening of temperature regulating valves and actual flow in branches respectively in the condition of different supply-return water pressure differences in three kinds of operating conditions of pipe network including all terminal branches being hydraulic adjustable, part AHU closing and part AHU being out of adjustment. The calculation results are in accord with the natural characteristics of reversed return pipe network.