一次泵变流量系统旁通控制模拟分析  

Simulation and Analysis of Bypass Control in Primary-pumping Variable Water System

作　　者：刘庆东 徐新华[1] 车轮飞[2] 刘俊[2] Liu Qindong;Xu Xinhua;Che Lunfei;Liu Jun(School of Environment Science ＆ Engineering,Huazhong University of Science and Technology,Wuhan,430074;China Railway Siyuan Survey and Design Group Co.,Ltd,Wuhan,430063)

机构地区：[1]华中科技大学建筑环境与能源应用工程系,武汉430074 [2]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《制冷与空调（四川）》2018年第5期464-469,共6页Refrigeration and Air Conditioning

基　　金：国家自然科学基金(51678263)

摘　　要：分析了一次泵变流量空调系统旁通控制的方法及特点,并根据某项目空调水系统实际布置与配置,搭建模拟平台,进行水系统管网模拟。模拟分析了在变流量系统中水泵采用压差变频控制时,压差旁通控制和最小流量旁通控制的控制效果。结果表明,在采用压差旁通控制时,需要设置水泵变频运行的最低频率,但是实际工程运行工况多变,固定的最低运行频率难以满足多工况情况下制冷机最低限流量需求,控制程序设计也复杂。最小流量旁通控制直接以系统流量作为控制参数进行旁通阀门的开启调节控制,简单、方便。采用水泵压差变频控制+压差旁通控制与水泵压差变频控制+最小流量旁通控制的能耗基本一样。建议在一次泵变流量系统中设置流量传感器直接采用最小流量旁通控制。This paper analyzes the method and characteristics of bypass control of primary-pumping variable water system.The simulation platform of a real primary-pumping variable water system was developed according to its actual arrangement andconfiguration. The characteristics of the variable water system pipe network were simulated with pressure differential bypasscontrol and minimum flow bypass control. The results show that a minimum frequency of the pump needs to be set when usingpressure differential bypass control. However, the actual operation conditions vary significantly, and it is very difficult to set a fixedminimum operation frequency for meeting the minimum flow requirement of chiller evaporator under multiple conditions. Inaddition, the control design is also complicated. Minimum flow bypass control uses directly the measured system flow to controlthe bypass valve automatically. This control is simple, convenient. The energy consumptions by using pump frequency control＋pressure differential bypass control and using pump frequency control＋minimum flow bypass control are almost the same. Wesuggest to use the minimum flow bypass control in primary-pumping variable flow system.

关 键 词：一次泵变流量系统 水泵变频控制 最小流量旁通控制 压差旁通控制 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]