一次泵变流量系统旁通控制工程案例分析
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摘要
本文根据某实际空调系统的控制与运行现状,实施了节能控制改造。提出了一次泵变流量系统采用检测流量进行最小流量旁通控制的方法,并在该项目中实施应用。在改造完成后,通过系统调试及阶跃测试获得了最小流量旁通的相关控制参数,并对系统实施实际控制。本文给出了最小流量旁通控制在满负荷日和部分负荷日的控制效果。结果表明,最小流量旁通控制可以直接以系统流量作为控制参数对旁通阀门进行调节,控制稳定可靠。在不同负荷日,无论是系统末端部分支路关闭还是在系统所需流量较小时,最小流量旁通控制器都能迅速动作,调节旁通阀门的开度,维持系统流量在最小流量设定值,对系统流量能做到准确控制。在一次泵变流量系统中设置流量传感器并采用该测量值进行最小流量旁通控制是一种简单可行的旁通控制方法。
Based on the actual control and operation situation of an air conditioning system, an upgrading energy-saving control strategy was implemented in this system. A minimum flow bypass-control method by using measured flowrate is proposed for primary-pumping variable water system. After the retrofitting and upgrading, the control parameters for the minimum flow bypass-control were obtained through commissioning and step response tests. These parameters are used for the actual control. This paper further presents the control effects of this method in a typical full load day and a typical partial load day. The results show that the minimum flow bypass control can control the bypass valve well by using the system flow as the control value. This control is stable and reliable. In different load days, the minimum flow bypass controller can response and regulate the opening of the bypass valve quickly to maintain the system flowrate at the setting value well no matter if many branches of this system are closed or the required flow is very small. The minimum flow bypass-control method by using a flow meter is simple and feasible.
Based on the actual control and operation situation of an air conditioning system, an upgrading energy-saving control strategy was implemented in this system. A minimum flow bypass-control method by using measured flowrate is proposed for primary-pumping variable water system. After the retrofitting and upgrading, the control parameters for the minimum flow bypass-control were obtained through commissioning and step response tests. These parameters are used for the actual control. This paper further presents the control effects of this method in a typical full load day and a typical partial load day. The results show that the minimum flow bypass control can control the bypass valve well by using the system flow as the control value. This control is stable and reliable. In different load days, the minimum flow bypass controller can response and regulate the opening of the bypass valve quickly to maintain the system flowrate at the setting value well no matter if many branches of this system are closed or the required flow is very small. The minimum flow bypass-control method by using a flow meter is simple and feasible.
引文
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[2] Jin Xinqiao, Du Zhimin, Xiao Xiaokun. Energy evaluation of optimal control strategies for central VWV chiller systems[J].Applied Thermal Engineering, 2007,27:934-941
[3] 刘东,陈沛霖,刘传聚.变频技术与空调节能[J]. 节能技术, 2001, 11(6): 25-27
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[5] 邓祺,刘新民.不同节能控制技术在空调冷水系统中的碰撞[J]. 暖通空调, 2015, 45(4):13-20,12
[6] 赵宇,孙建新,李婧,等.一次泵变流量系统在地铁空调系统中的设计与节能分析[J]. 应用能源技术, 2008, 1:42-45
[7] 丁敬孜.一次泵变流量系统的工程设计实例[J]. 四川建材, 2013, 39(2): 254-256
[8] 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
[9] 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
[10] 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
[11] 车轮飞,刘庆东,刘俊,等.一次泵定流量系统旁通控制模拟与分析[J]. 建筑热能通风空调, 2018,37(11):21-24
[12] 郝庆,张子平,穆丽慧.一次泵变流量系统的设计[J]. 制冷与空调, 2007, 7(6):47-51
[2] Jin Xinqiao, Du Zhimin, Xiao Xiaokun. Energy evaluation of optimal control strategies for central VWV chiller systems[J].Applied Thermal Engineering, 2007,27:934-941
[3] 刘东,陈沛霖,刘传聚.变频技术与空调节能[J]. 节能技术, 2001, 11(6): 25-27
[4] 亢抗,韩志峰.工业建筑空调冷源一次泵变流量系统设计[J]. 暖通空调, 2010, 40(4):11-12,15
[5] 邓祺,刘新民.不同节能控制技术在空调冷水系统中的碰撞[J]. 暖通空调, 2015, 45(4):13-20,12
[6] 赵宇,孙建新,李婧,等.一次泵变流量系统在地铁空调系统中的设计与节能分析[J]. 应用能源技术, 2008, 1:42-45
[7] 丁敬孜.一次泵变流量系统的工程设计实例[J]. 四川建材, 2013, 39(2): 254-256
[8] 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
[9] 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
[10] 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
[11] 车轮飞,刘庆东,刘俊,等.一次泵定流量系统旁通控制模拟与分析[J]. 建筑热能通风空调, 2018,37(11):21-24
[12] 郝庆,张子平,穆丽慧.一次泵变流量系统的设计[J]. 制冷与空调, 2007, 7(6):47-51