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| Influences of pipe network on energy consumption of variable flow pump |
| Ge Fenghua1,Yu Qiusheng2,Hu Zicheng1 |
| (1.School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;2.School of Municipal & Environmental Engineering,Jilin Architectural and Civil Engineering Institute,Changchun,Jilin 130021,China) |
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Abstract In the HVAC water systems,pipe network characteristics and impedances have important impacts on pump operation.Running example for the variable flow pump in different pipe network was calculated and analyzed through valve control,unit number control and frequency control.The influences of pipeline types on energy consumption of variable flow pump were discussed.The relationships between pipeline types and hydraulic operation characteristics of the pump,and that between flow control methods and energy consumption for pump operation were taken into account.The results show that pipe network characteristics have a great influence on energy consumption for a variable flow pump.Pump energy can be reduced by adjusting flow rate such as increasing the flow resistance of the pipeline.Under frequency control mode,energy consumption is decreased with increasing static pressure,energy consumption is also greater in closed pipe network than that in opened pipe network.In closed pipe network,pump number control and frequency control are two effective methods to adjust pump energy.The operation conditions do not meet the affinity laws due to the system changing.Within pressure difference control,the worst pressure differences of pipeline become the second adverse one probably.So pressure difference control could cause hydraulic misadjustment for variable end pipeline,the minimum resistance control has greater energy-saving than the constant pressure difference control
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Received: 20 May 2010
Published: 30 May 2011
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