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Frequency of multiple pumps running performance simulation of the program

Small, so the efficiency is almost unchanged. The total shaft power from the relative changes with the back pressure of view, a certain height in the back pressure, the program 3-axis power of the minimum, maximum shaft power Option 1, Option 2 the second, but the program is closer to 3-axis power. Accordingly, large pump and adjust the flow of small pumps in parallel operation, the regulator regulate large pump power is less than a small pump power. Shaft power while all three schemes increase linearly with the back pressure. Option 3 of them the fastest growing, Option 2 is also close to the program 3, the slowest increase in program 1. 3 Conclusion (1) three pumps in parallel single-pump variable-speed control, the speed pump efficiency, shaft power by the back pressure and adjust the flow effects vary widely. The same back pressure flow increases, the efficiency increase; the same flow rate back pressure increases, the efficiency increases. But the timing pump by the back pressure by the flow rate was greater than that of. Although no back pressure, but the speed and efficiency of pump efficiency rated conditions vary greatly, shaft power changes do not change with the flow of a cubic relationship. The efficiency of two fixed speed pumps, the shaft power by the back pressure and regulate the flow of small, varied little. (2) pumps in parallel implementation of three variable-speed control of two pumps, one pump running at constant speed, speed pump efficiency,[link widoczny dla zalogowanych], shaft power by the back pressure and adjust the flow of the same back pressure flow increases,[link widoczny dla zalogowanych], the efficiency increase; the same flow rate back pressure increases, the efficiency increases. However, the efficiency of two fixed speed pumps, the shaft power by the back pressure and regulate the flow of small, varied little. (3) the implementation of three parallel pumps adjust the pump speed when the relative efficiency of variable speed pumps almost no change. Shaft power by the back pressure and adjust the flow changes, with the change of flow was cubic, with the back-pressure linear. (4) parallel implementation of adjustment programs do not like the pump, the pump and the overall consumption of power by the back pressure regulating flow of the same back pressure flow increases, the difference in power consumption has also increased; the same flow back pressure increases, consumption also increased the power difference . Regulate the flow the smaller the greater the difference in power consumption. Proposed size of the pumps in parallel operation, should give priority to adjust the large pump, and the overall shaft power less. References: [1] Fu Yong Zheng, Wu Keqi. Back pressure on the variable-speed control of pumps and fans the impact of energy efficiency [J】 _ HVAC,[link widoczny dla zalogowanych], 2004,34 (3): 7O ~ 72. [2] VENTILATING Li Jisheng, Dai Binwen. Open-system energy-saving variable speed pump analysis 【J]. HVAC,[link widoczny dla zalogowanych], 2002,32 (1): 59 ~ 61. [3] Chen Hong, Ding exercise. Process design and building energy-saving air conditioning [M】. Beijing: China Electric Power Press, 2004. [4] of money to clear. High-rise building air conditioning and energy saving [M]. Shanghai: Tongji University Press, 1990. Received date :2006-07-07 Revised :2006-09-22SimulationofVariableSpeedsOperationSchematicsforMultipleParalleledPumpsXUGuang - ying (InstituteofShipping & buildingEngineeringZhejiangOceanCollege,[link widoczny dla zalogowanych], Zhoushan316004, China) Abstract: Basedonperformancecurvefigureforthemultipleparalleledpumps, simulatedthesuchoperatingperformanceasefficiencyandaxialpowerforindividualconstantspeedpumpsandvariablespeedpumpsonthethreeschematic: singlevariablespeeds, twovariablespeedandthreevariablespeeds. TheresultsshowthatefficiencyandaxialpowerdependonexitpressureandfluidcapacityaswellashavecertainguidingfunctionsfordesignerandoperatorKeywords: paralleledpumps; variablespeeds; simulation Author: Xu Guang Ying (1967 a), male, Lujiang, Master, associate professor, research direction: building thermal physics, air-conditioning energy saving technology. I5

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