一次泵变流量系统旁通控制模拟分析
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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 and configuration. The characteristics of the variable water system pipe network were simulated with pressure differential bypass control and minimum flow bypass control. The results show that a minimum frequency of the pump needs to be set when using pressure differential bypass control. However, the actual operation conditions vary significantly, and it is very difficult to set a fixed minimum operation frequency for meeting the minimum flow requirement of chiller evaporator under multiple conditions. In addition, the control design is also complicated. Minimum flow bypass control uses directly the measured system flow to control the 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. We suggest to use the minimum flow bypass control in primary-pumping variable flow system.
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 and configuration. The characteristics of the variable water system pipe network were simulated with pressure differential bypass control and minimum flow bypass control. The results show that a minimum frequency of the pump needs to be set when using pressure differential bypass control. However, the actual operation conditions vary significantly, and it is very difficult to set a fixed minimum operation frequency for meeting the minimum flow requirement of chiller evaporator under multiple conditions. In addition, the control design is also complicated. Minimum flow bypass control uses directly the measured system flow to control the 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. We suggest to use the minimum flow bypass control in primary-pumping variable flow system.
引文
[1]Zhenjun Ma,Shengwei Wang.An optimal control strategy for complex building central chilled water system for practical and real-time applications[J].Building and Environment,2009,44:1188-1198.
[2]Zhenjun Ma,Shengwei Wang.Energy efficient control of variable speed pumps in complex building central air-conditioning systems[J].Energy and Buildings,2009,41:197-205.
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[5]张再鹏,陈焰华,符永正.一次泵变流量系统的旁通方法研究[J].暖通空调,2009,39(6):51-55.
[6]胡曙玲.一次泵系统技术分析及应用[J].流体机械,2002,30(4):34-37.
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[8]李宜浩,梁启双.变流量水系统压差旁通控制系统设计[J].暖通空调,2007,37(12):73-76.
[9]何毅,任庆昌,李明,等.冷冻水一次泵变流量可行性分析及工程应用[J].建筑节能,2016,44(9):11-14,49.
[10]张再鹏,陈焰华,於仲义,等.一次泵变流量系统水泵控制方法的节能分析[J].暖通空调,2009,39(6):56-59.
[11]黄奕沄,张玲.压差控制水泵变频调节的工作特性探讨[J].暖通空调,2006,36(4):75-78.
[2]Zhenjun Ma,Shengwei Wang.Energy efficient control of variable speed pumps in complex building central air-conditioning systems[J].Energy and Buildings,2009,41:197-205.
[3]丁勇,魏嘉.冷冻水泵变频改造的节能性能分析[J].建筑节能,2015,43(9):1-7.
[4]于晓明,赵建博,石颖,等.空调冷水一次泵变流量系统设计探讨[J].暖通空调,2010,40(4):67-70,62.
[5]张再鹏,陈焰华,符永正.一次泵变流量系统的旁通方法研究[J].暖通空调,2009,39(6):51-55.
[6]胡曙玲.一次泵系统技术分析及应用[J].流体机械,2002,30(4):34-37.
[7]吴敏,杨浩.变流量一次泵与旁通电动阀的控制和选择[J].四川建筑,2014,34(1):201-204,207.
[8]李宜浩,梁启双.变流量水系统压差旁通控制系统设计[J].暖通空调,2007,37(12):73-76.
[9]何毅,任庆昌,李明,等.冷冻水一次泵变流量可行性分析及工程应用[J].建筑节能,2016,44(9):11-14,49.
[10]张再鹏,陈焰华,於仲义,等.一次泵变流量系统水泵控制方法的节能分析[J].暖通空调,2009,39(6):56-59.
[11]黄奕沄,张玲.压差控制水泵变频调节的工作特性探讨[J].暖通空调,2006,36(4):75-78.