The Experts below are selected from a list of 0 Experts worldwide ranked by ideXlab platform
Gang Wang - One of the best experts on this subject based on the ideXlab platform.
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Uncertainty analysis for different virtual Pump water flow meters
Science and Technology for the Built Environment, 2019Co-Authors: Gang Wang, Zufen Wang, Li SongAbstract:The water flow rate through a Pump can be calculated using other measured inputs, such as Pump Head, motor input power, and frequency, along with calibrated characteristic curves. Currently virtual...
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Development of a virtual Pump water flow meter with a flow rate function of motor power and Pump Head
Energy and Buildings, 2016Co-Authors: Gang Wang, Koosha Kiamehr, Li SongAbstract:Abstract Water flow rates are key operating variables in chilled and hot water systems. The water flow rate through a Pump can be virtually measured using available motor power and Pump Head with projected motor and Pump efficiencies. In general, motor efficiency is implicitly determined by motor power while Pump efficiency is given as a function of water flow rate. As a result, the water flow rate has to be calculated through a numerical method, which is difficult to apply in building automation systems (BAS). The objective of this paper is to develop a virtual Pump water flow meter, which can be implemented in BAS with an explicit expression of motor power and Pump Head. First, motor efficiency is regressed as a function of motor power by consolidating multiple dependent factors, then Pump efficiency function is reconstructed with Pump shaft power and Head, and finally experiments are conducted to develop and validate a virtual Pump water flow meter on a chilled water Pump. The experimental results show that the virtual flow measurements agree well with the flow measurement by a physical meter. The measurement standard deviation is 0.5 L/s for a Pump with the design flow rate of 37.9 L/s.
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The Energy Consumption Calculation of the Fan Coil Chilled Water System Based on Variable Chilled Water Temperature and Flux
Advanced Materials Research, 2012Co-Authors: Gang WangAbstract:The article builds up the mathematics model about the fan coil chilled water system energy consumption. By the model, it calculates the energy consumption under the different flux ratio, the result shows that the optimal water parameter is different from the design parameter, it has relation with the chilled water Pump Head. When the Pump Head value is larger, adopting the smaller design flux’s parameter; when the Pump Head value is smaller, adopting the larger design flux’s parameter. So to make the energy consumption minimum, the water parameter should be computered.
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Demonstration of an Energy Meter Using a Pump Flow Station
ASME 2008 2nd International Conference on Energy Sustainability Volume 1, 2008Co-Authors: Gang Wang, David E. ClaridgeAbstract:Heating and cooling energy consumption measurements are critical for operations, controls, and fault detection and diagnosis of heating, ventilation and air conditioning (HVAC) systems. Generally water flow has to be measured in order to determine energy consumption in either chilled water systems or hot water systems. Economical and accurate water flow measurements are essential to develop energy meters. Since Pump performance relates actual Pump water flow to Pump Head and power, theoretically water flow through a Pump can be determined by other Pump performance characteristics, such as Pump Head and motor power. This paper presents the theoretical model of Pump flow stations based on Pump Head and motor power, and the experiments and results of a cooling energy meter using a Pump flow station developed on the chilled water system at a facility.© 2008 ASME
Li Song - One of the best experts on this subject based on the ideXlab platform.
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Uncertainty analysis for different virtual Pump water flow meters
Science and Technology for the Built Environment, 2019Co-Authors: Gang Wang, Zufen Wang, Li SongAbstract:The water flow rate through a Pump can be calculated using other measured inputs, such as Pump Head, motor input power, and frequency, along with calibrated characteristic curves. Currently virtual...
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Development of a virtual Pump water flow meter with a flow rate function of motor power and Pump Head
Energy and Buildings, 2016Co-Authors: Gang Wang, Koosha Kiamehr, Li SongAbstract:Abstract Water flow rates are key operating variables in chilled and hot water systems. The water flow rate through a Pump can be virtually measured using available motor power and Pump Head with projected motor and Pump efficiencies. In general, motor efficiency is implicitly determined by motor power while Pump efficiency is given as a function of water flow rate. As a result, the water flow rate has to be calculated through a numerical method, which is difficult to apply in building automation systems (BAS). The objective of this paper is to develop a virtual Pump water flow meter, which can be implemented in BAS with an explicit expression of motor power and Pump Head. First, motor efficiency is regressed as a function of motor power by consolidating multiple dependent factors, then Pump efficiency function is reconstructed with Pump shaft power and Head, and finally experiments are conducted to develop and validate a virtual Pump water flow meter on a chilled water Pump. The experimental results show that the virtual flow measurements agree well with the flow measurement by a physical meter. The measurement standard deviation is 0.5 L/s for a Pump with the design flow rate of 37.9 L/s.
Igor Sutlovic - One of the best experts on this subject based on the ideXlab platform.
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improving centrifugal Pump efficiency by impeller trimming
Desalination, 2009Co-Authors: Mario Savar, Hrvoje Kozmar, Igor SutlovicAbstract:Due to high capacities of desalination plants, efficient operation of all their components, including centrifugal Pumps is very important. It is often found that centrifugal Pumps do not operate in their optimal points for various reasons. One of method to improve efficiency of centrifugal Pump is proposed here. Impeller trimming is a common practice performed by Pump manufacturers and users when it is necessary to adjust the centrifugal Pump Head and flow to the actual needs. The trimmed Pump is not strictly similar to the initial Pump because only a few parameters are modified, while all the others remain unchanged. In spite of this, the assumption of valid similarity was made here and examined through a series of experiments. A centrifugal Pump impeller of low specific speed was trimmed and tested successively. For this particular Pump, the influence of disregarded similarity can be estimated to +/-3, 94% for the Pump Head and to +/-5, 24% for the power, both with a 95% statistical certainty.
Mario Savar - One of the best experts on this subject based on the ideXlab platform.
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improving centrifugal Pump efficiency by impeller trimming
Desalination, 2009Co-Authors: Mario Savar, Hrvoje Kozmar, Igor SutlovicAbstract:Due to high capacities of desalination plants, efficient operation of all their components, including centrifugal Pumps is very important. It is often found that centrifugal Pumps do not operate in their optimal points for various reasons. One of method to improve efficiency of centrifugal Pump is proposed here. Impeller trimming is a common practice performed by Pump manufacturers and users when it is necessary to adjust the centrifugal Pump Head and flow to the actual needs. The trimmed Pump is not strictly similar to the initial Pump because only a few parameters are modified, while all the others remain unchanged. In spite of this, the assumption of valid similarity was made here and examined through a series of experiments. A centrifugal Pump impeller of low specific speed was trimmed and tested successively. For this particular Pump, the influence of disregarded similarity can be estimated to +/-3, 94% for the Pump Head and to +/-5, 24% for the power, both with a 95% statistical certainty.
Romuald Skoda - One of the best experts on this subject based on the ideXlab platform.
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numerical investigation of two phase air water flow in a centrifugal Pump with closed or semi open impeller
13th European Conference on Turbomachinery Fluid dynamics & Thermodynamics, 2019Co-Authors: Markus Hundshagen, Michael Mansour, Dominique Thévenin, Romuald SkodaAbstract:3D CFD-simulations of a centrifugal research Pump in single- and two-phase flow conditions with closed and semi-open impeller are performed. In single-phase flow, a satisfactory agreement to experimental data in terms of Head prediction is obtained. For two-phase flows, an Eulerian-Eulerian monodisperse model in combination with a statistical turbulence model is used. A grid dependency is unavoidable for large bubbles since a bubble diameter exceeding the grid scale limits a further refinement of finite volume grid cells. The air bubble diameter is a key parameter for Pump performance calculation, which can be shown by a bubble size variation, in which the experimental Pump Head is captured qualitatively well. Further studies will focus on the improvement of the two-phase model to allow simulations of dense disperse phase and bubble sizes larger than the grid scale. Enabling polydispersity and bubble interaction are assumed to be essential for quantitative Pump Head prediction.
