一次泵定流量系统旁通控制模拟与分析
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摘要
本文分析了空调一次泵定流量系统旁通控制的方法及特点,并根据某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,比较分析了压差旁通控制和最小流量旁通控制的控制效果。结果表明,在一次泵定流量系统中,采用压差旁通控制能够维持系统流量恒定并满足制冷机蒸发器最低流量的需求,此时制冷机组的流量很大。当系统采用最小流量旁通控制时,可以达到对于系统流量精确控制的目的并满足制冷机蒸发器最低流量要求。在定流量空调水系统中,无论是压差旁通控制还是最小流量控制都存在大量的流量及水泵能耗浪费,应采用变速调节措施提高系统能效。
This paper analyzes the method and characteristics of the bypass control of a primary-pumping water system with constant speed.The simulation platform of a real primary-pumping water system was developed according to its actual arrangement and configuration.The characteristics of the water system pipe network were simulated with the differential pressure bypass control and the minimum flow bypass control.The results show that the differential pressure bypass control for the primary-pumping water system may maintain constant flow and meets the minimum flow demand for the chiller evaporator.However,the flow is much larger than the rated flow.When the minimum flow bypass control is used,the system flow can be controlled precisely,and the minimum flow demand is met.However,much energy is consumed in the primary-pumping water system with constant speed whether differential pressure bypass control is used or minimum flow bypass control is used.Variable speed measures should be used for improving energy efficiency.
This paper analyzes the method and characteristics of the bypass control of a primary-pumping water system with constant speed.The simulation platform of a real primary-pumping water system was developed according to its actual arrangement and configuration.The characteristics of the water system pipe network were simulated with the differential pressure bypass control and the minimum flow bypass control.The results show that the differential pressure bypass control for the primary-pumping water system may maintain constant flow and meets the minimum flow demand for the chiller evaporator.However,the flow is much larger than the rated flow.When the minimum flow bypass control is used,the system flow can be controlled precisely,and the minimum flow demand is met.However,much energy is consumed in the primary-pumping water system with constant speed whether differential pressure bypass control is used or minimum flow bypass control is used.Variable speed measures should be used for improving energy efficiency.
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]廖滟,常文成,牛利敏.中央空调冷冻水系统问题分析及研究状况[J].制冷与空调,2016,30(1):36-41
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[4]李宜浩,梁启双.中央空调变流量水系统电动压差旁通控制系统的设计[J].山东暖通空调,2007,(2):261-265.
[5]张再鹏,陈焰华,符永正.一次泵流量系统的旁通方法研究[J].暖通空调,2009,39(6):51-55
[6]张再鹏,陈焰华,於仲义.一次泵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
[7]刘雪峰,刘金平,陈星龙.考虑旁通回路的空调冷冻水系统变压差控制静态稳定性分析[J].上海交通大学学报,2014,48(6):772-777
[8]孙一坚,潘尤贵.空调水系统变流量节能控制(续1):水流量变化对空调系统运行的影响[J].暖通空调,2004,34(7):60-63
[9]孙一坚,潘尤贵.空调水系统变流量节能控制(续2):变频调速水泵的合理应用[J].暖通空调,2005,35(10):90-92
[10]刘金平,邹伟,刘雪峰.采用旁通阀定压差控制的冷水泵功耗特性试验研究[J].土木建筑与环境工程,2010,32(6):80-85
[2]廖滟,常文成,牛利敏.中央空调冷冻水系统问题分析及研究状况[J].制冷与空调,2016,30(1):36-41
[3]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
[4]李宜浩,梁启双.中央空调变流量水系统电动压差旁通控制系统的设计[J].山东暖通空调,2007,(2):261-265.
[5]张再鹏,陈焰华,符永正.一次泵流量系统的旁通方法研究[J].暖通空调,2009,39(6):51-55
[6]张再鹏,陈焰华,於仲义.一次泵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
[7]刘雪峰,刘金平,陈星龙.考虑旁通回路的空调冷冻水系统变压差控制静态稳定性分析[J].上海交通大学学报,2014,48(6):772-777
[8]孙一坚,潘尤贵.空调水系统变流量节能控制(续1):水流量变化对空调系统运行的影响[J].暖通空调,2004,34(7):60-63
[9]孙一坚,潘尤贵.空调水系统变流量节能控制(续2):变频调速水泵的合理应用[J].暖通空调,2005,35(10):90-92
[10]刘金平,邹伟,刘雪峰.采用旁通阀定压差控制的冷水泵功耗特性试验研究[J].土木建筑与环境工程,2010,32(6):80-85