scholarly journals Optimization of the Pumping Capacity of Centrifugal Pumps Based on System Analysis

2021 ◽  
Vol 347 ◽  
pp. 00024
Author(s):  
Motsi Ephrey Matlakala ◽  
Daramy Vandi Von Kallon
Keyword(s):  
System Analysis ◽  
Fluid Dynamic ◽  
Operating Cost ◽  
Maximum Flow ◽  
Maintenance Cost ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Pump Operation ◽  
Head Losses ◽  
Pumping System

The pumping capacity is the maximum flow rate through a pump at its design capacity. In the process of pumping water and other fluids, pumping capacity is required to accurately size pumping systems, determine friction head losses, construct a system curve and select a pump and motor. Failure to choose the right pump size for pumping system, improper installation and pump operation results into higher consumption of energy. The insufficient pumping capacity affects the plant’s operations such as maintenance cost, downtime, loss of production and increase in operating cost. In this study variation of the impeller diameter is used to calculate the new pump curve to improve the pumping capacity. The pumping system is analysed to determine the pumping capacity of the pump. Computational fluid dynamic (CFD) simulations are carried out to determine the performance of the pump and analyses the pumping system to achieve the pumping capacity. Results show that enhanced pumping capacity is achieved at a given impeller design with a specific shift in the pump curve. It is recommended that the pumping capacity can be optimized through trimming of impeller. Trimming of the impeller improves pump efficiency and increases the performance of the pump. In addition, the pumping capacity can also be optimized through the system analysis by adjusting the diameter of the pipes and throttling of the valves. Optimization of the pumping capacity helps with running the pumping system efficiently.

scholarly journals Energy Efficiency Indicators for Water Pumping Systems in Multifamily Buildings

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7152
Author(s):  
Danilo Ferreira de Souza ◽  
Emeli Lalesca Aparecida da Guarda ◽  
Ildo Luis Sauer ◽  
Hédio Tatizawa
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Design Guidelines ◽  
Pump Efficiency ◽  
Electric Motors ◽  
Centrifugal Pumps ◽  
Pumping System ◽  
Water Pumping ◽  
Definition Of ◽  
Multifamily Buildings

With the current concerns about sustainable development and energy consumption in buildings, water pumping systems have become essential for reducing energy consumption. This research aims to develop guidelines for the energy assessment of water pumping systems in multifamily buildings. The methodological procedures are: (i) definition of the efficiencies of electric motors; (ii) definition of pump efficiency levels; (iii) determination of energy consumption; and (iv) construction of the efficiency scale and guidelines for projects and assessments. The results obtained were that centrifugal pumps with 40% efficiency have higher energy consumption, regardless of the efficiency class of the electric motors, showing a 20% increase in electrical energy consumption. Lower efficiencies directly impact the energy efficiency rating of the water pumping system. Thus the 40% efficiency obtained energy efficiency rating “Very Low—VL” for all motor efficiency classes (between IE1 and IE5). At 60% efficiency, the energy efficiency level of the system was “Average—A”, gradually increasing to “Very High—VH”, as the energy consumption in the pumps decreased and the motors’ energy efficiency classes increased. It is concluded that designers and professionals in the area must consider the efficiency of the pumps, as they play a fundamental role in the classification of the system’s energy efficiency. It is also recommended to verify the energy efficiency of the water pumping system and implement design guidelines so that the pumping system achieves lower energy consumption, contributing to the building’s energy efficiency and sustainability.

scholarly journals Design of solar photovoltaic pressurized drip irrigation pumping system at al-salman district in samawa governorate

2019 ◽  
Vol 10 (3) ◽  
pp. 1628
Author(s):  
Raghad Ali Mejeed ◽  
Samah Shyaa Oudah ◽  
Rasha Yasen Abed
Keyword(s):  
Drip Irrigation ◽  
Operation Time ◽  
Maximum Flow ◽  
Irrigation Scheduling ◽  
Climatic Data ◽  
Pump Efficiency ◽  
Pumping System ◽  
A Value ◽  
Maximum Water

The seasonal climate changes have direct effects on determination of crop water requirement, irrigation scheduling and the potential of solar energy generation to operate the pumping system for watering crops. This research paper studied the technical evaluation of solar pumping and pressurized drip irrigation systems to investigate the recommended water required for suggested tomatoes crop in area of (one hectare) at AL-Salman district using measured climatic data from AL-Salman Agro-meteorological weather station for a period (2013-2017). The maximum average monthly of solar radiation was 7.6 kWh/m<sup>2 </sup>at June in all the years of recording data, while the minimum average monthly value was 3.37kWh/m<sup>2</sup> at December where the sun at lowest point across the sky. The annual average hours of peak sun that corresponds to the operation time of the pumping system at maximum water consumption was calculated at eight months from March to October with a value of 7.2 hours/day, while it was 5.2 hours/day during the other four months (January, February, November and December). The Solar pumping sizing based on H-Q performance curve of a maximum flow rate of 64.45 m3/h and pump capacity of 16.79 kW with compounds motor pump efficiency of 61.2%. The total water production was 230000 m³/per year which indicates compatible overall system design and adequate to irrigate more planting land with same or other crop types.

scholarly journals Pressure Pulsation and Cavitation Phenomena in a Micro-ORC System

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2186 ◽  
Author(s):  
Nicola Casari ◽  
Ettore Fadiga ◽  
Michele Pinelli ◽  
Saverio Randi ◽  
Alessio Suman
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Fluid Dynamic ◽  
Pressure Rise ◽  
Inlet Section ◽  
Gear Pump ◽  
Pump Operation ◽  
Transient Phenomena ◽  
Pumping System

Micro-ORC systems are usually equipped with positive displacement machines such as expanders and pumps. The pumping system has to guarantee the mass flow rate and allows a pressure rise from the condensation to the evaporation pressure values. In addition, the pumping system supplies the organic fluid, characterized by pressure and temperature very close to the saturation. In this work, a CFD approach is developed to analyze from a novel point of view the behavior of the pumping system of a regenerative lab-scale micro-ORC system. In fact, starting from the liquid receiver, the entire flow path, up to the inlet section of the evaporator, has been numerically simulated (including the Coriolis flow meter installed between the receiver and the gear pump). A fluid dynamic analysis has been carried out by means of a transient simulation with a mesh morphing strategy in order to analyze the transient phenomena and the effects of pump operation. The analysis has shown how the accuracy of the mass flow rate measurement could be affected by the pump operation being installed in the same circuit branch. In addition, the results have shown how the cavitation phenomenon affects the pump and the ORC system operation compared to control system actions.

Performance Analysis and Cavitation Prediction of Centrifugal Pump Using Various Working Fluids

2019 ◽  
Vol 12 (3) ◽  
pp. 227-239 ◽  
Author(s):  
Atiq Ur Rehman ◽  
Akshoy Ranjan Paul ◽  
Anuj Jain
Keyword(s):  
Crude Oil ◽  
Centrifugal Pump ◽  
Cfd Simulation ◽  
Saline Water ◽  
Operating Cost ◽  
Suction Side ◽  
Working Fluid ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Working Fluids

Background: The application of centrifugal pumps is found in domestic and petrochemical industries. Industrial centrifugal pumps are designed and tested using water as working fluid before supplied to industries, as water is commonly available. However, centrifugal pumps are used in industries for various applications, which involve the handling of fluids other than water- like saline-water, crude oil, gasoline, etc. Consequently, hydraulic performance of the pump differs from the designed and tested values and pump performance becomes unpredictable. Cavitation characteristics of the pump handling different fluids other than water are also changed and many a time, cavitation starts prematurely. As a result, the operating cost of pump is increased. Objective: A CFD based computational analysis of a single-stage, single-entry industrial centrifugal pump having double-volute casing is carried out to compare the performance and cavitation characteristics for various working fluids, namely water, saline water with varying salinity, gasolene and crude oil. Methods: Multiple Reference Frame method (MRF) available in Reynolds-Averaged Navier-Stokes (RANS) equations based CFD solver Ansys-CFX is used in the present study. CFD simulation is carried out for five flow rates with Standard k-ε turbulence model. Rayleigh-Plesset equation describing the growth of a single vapor bubble in a liquid is used for predicting the cavitation flow behaviour. Results: Minimum static pressure is computed at the suction side of saline water as compared to the other working fluids studied here. Hydraulic efficiency of crude oil is found to be the lowest as compared to other fluids. Supercavitation (excessive formation of vapor bubbles and sudden drop in head up to 3%) starts early for saline water with 40g/kg salinity. Conclusion: The results show little variation in pump efficiency when water and saline water are used as working fluids. However, cavitation characteristics differ considerably with the working fluids. Recent patents filed/published in this area revealed that efforts are needed to develop effective cavitationresistant centrifugal impellers and pumps.

scholarly journals Aplicação de modelos de otimização na operação de sistemas elevatórios em redes de abastecimento de água

2020 ◽  
Vol 1 (51) ◽  
pp. 166
Author(s):  
Kennedy Flávio Meira de Lucena
Keyword(s):  
Operating Cost ◽  
Water Supply Systems ◽  
Environmental Preservation ◽  
Pump Operation ◽  
Pumping System ◽  
Quality Of Water ◽  
Cost Of Energy ◽  
Generalized Reduced Gradient ◽  
Excel Solver

Water supply systems are fundamental to society and are increasingly being demanded in terms of quantity and quality of water. In addition to these two aspects, which are the basis of the service provided, other issues have generated a lot of pressure, environmental preservation, the quality of service from companies, and costs to consumers. The improvement in the provision of the service and the reduction of costs necessarily involves the improvement of the system’s operation. The energy cost of pumping is one of the factors that most affect the operating cost of the systems. The relevance of the cost of energy with pumping motivated this work. Through computational modeling, we sought to minimize the costs of a real pumping system. Nonlinear programming and the genetic algorithms of the Excel solver tool were applied to obtain the optimal cost of pumping. The decision variables of the model were the 24-hour pump operation intervals. The main restrictions are to respect the limits of the reservoirs and the recovery of levels at the end of the 24-hour cycle. Both techniques were able to find viable solutions, however, the evolutionary algorithms confirmed their slowness in relation to the generalized reduced gradient (GRG). In both techniques, peak hours were minimally allocated to the operation. Regarding the studied system, it was found that the main responsible for the operational cost is the transport of water treatment plants (WTP) to R5, approximately 81,69%, and there is a limitation in the pumping capacity that prevents the complete shutdown of the pumps during peak hours. In the present study, the following specific consumptions were obtained: elevatory station EE 1 (ETA-R5) 0.897kWh/m³; EE 2 (R5-R4) 0.16 kWh/m³; EE 3 (R4-RLS) 0.617037 kWh/m³ and EE 4 (R4-RC) of 0.471852 kWh/m³. Considering the average of the subsystem studied, there are 0.537 kWh/m³, EE 2 (R5-R4) being more efficient, and less efficient EE 1 (ETA-R5). This can be justified by the greater demand and because it is necessary to operate at peak hours with high-powered pumps. Investment in improving the system is necessary to increase its energy efficiency and, consequently, reduce the high costs of the operation.

scholarly journals Design and Optimization of a Centrifugal Pump for Slurry Transport Using the Response Surface Method

Machines ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 60
Author(s):  
Khaled Alawadhi ◽  
Bashar Alzuwayer ◽  
Tareq Ali Mohammad ◽  
Mohammad H. Buhemdi
Keyword(s):  
Response Surface ◽  
Centrifugal Pump ◽  
Industrial Applications ◽  
Pump Efficiency ◽  
Optimized Design ◽  
Centrifugal Pumps ◽  
Local Pressure ◽  
Design And Optimization ◽  
Geometry Characteristic ◽  
Line Design

Since centrifugal pumps consume a mammoth amount of energy in various industrial applications, their design and optimization are highly relevant to saving maximum energy and increasing the system’s efficiency. In the current investigation, a centrifugal pump has been designed and optimized. The study has been carried out for the specific application of transportation of slurry at a flow rate of 120 m3/hr to a head of 20 m. For the optimization process, a multi-objective genetic algorithm (MOGA) and response surface methodology (RSM) have been employed. The process is based on the mean line design of the pump. It utilizes six geometric parameters as design variables, i.e., number of vanes, inlet beta shroud, exit beta shroud, hub inlet blade draft, Rake angle, and the impeller’s rotational speed. The objective functions employed are pump power, hydraulic efficiency, volumetric efficiency, and pump efficiency. In this reference, five different software packages, i.e., ANSYS Vista, ANSYS DesignModeler, response surface optimization software, and ANSYS CFX, were coupled to achieve the optimized design of the pump geometry. Characteristic maps were generated using simulations conducted for 45 points. Additionally, erosion rate was predicted using 3-D numerical simulations under various conditions. Finally, the transient behavior of the pump, being the highlight of the study, was evaluated. Results suggest that the maximum fluctuation in the local pressure and stresses on the cases correspond to a phase angle of 0°–30° of the casing that in turn corresponds to the maximum erosion rates in the region.

Role of Dissipation Characteristics in Predicting Flow from Dissimilar Centrifugal Pumps

1994 ◽  
Vol 208 (4) ◽  
pp. 285-294 ◽  
Author(s):  
E A Bunt ◽  
B Parsons ◽  
F Holtzhausen
Keyword(s):  
Flow Characteristics ◽  
Maximum Flow ◽  
Centrifugal Pumps ◽  
Graphical Solution ◽  
Dissipative Flow ◽  
In Series ◽  
Lower Maximum ◽  
Output Field ◽  
High Series

Examination of flows in a particular case of dissimilar pumps coupled in series or in parallel (without check valves) showed that the ‘classical’ graphical solution of combined characteristics in the [+H, +Q] quadrant did not accord with the output field in certain regions. To predict the full flow fields, it was necessary to take into account dissipative flow characteristics in two other quadrants: for low-output parallel flow (when there is still flow available from the pump of higher head when the ‘weaker’ pump's flow has been reduced to zero), that in the [+H, –Q] quadrant; and for high series flow (after the output head of the pump of lower maximum flow has been reduced to zero), that in the [–H, +Q] quadrant. This problem does not arise when the pumps have identical characteristics.

Influence of Guide Ring on Energy Loss in a Multistage Centrifugal Pump

2018 ◽  
Vol 141 (6) ◽  
Author(s):  
Ren Yun ◽  
Zhu Zuchao ◽  
Wu Denghao ◽  
Li Xiaojun
Keyword(s):  
Energy Loss ◽  
Entropy Production ◽  
Evaluation Method ◽  
Guide Vane ◽  
Load Flow ◽  
Hydraulic Loss ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Multistage Pump ◽  
Guide Ring

Multistage centrifugal pumps are highly efficient and compact in structure. Pump efficiency can be improved by an effective understanding of hydraulic behavior and energy loss, however, the traditional hydraulic loss evaluation method does not readily reveal the specific locations of energy loss in the pump. In this study, a guide ring was imposed in multistage pumps, and an entropy production theory was applied to investigate irreversible energy loss of a multistage pump with and without guide ring. Detailed distributions of energy losses in the pumps were calculated to determine the respective entropy production rates (EPRs). The EPR values as calculated are in close accordance with actual hydraulic loss values in the pumps. EPR values were higher in the multistage pump with the guide ring than the pump without a guide ring under part-load flow conditions (0.2Qd). However, the vortex flow in the pump was weakened (or eliminated) by the guide ring as flow rate increased; this reduced energy loss in the chambers. Flow passing the chamber was stabilized by the guide ring, which decreased shock and vortex loss in the chamber and guide vane. Under both designed flow condition and overload conditions, the EPR values of the guide ring-equipped multistage pump were lower than those without the guide ring. Furthermore, minimum efficiency index (MEI) values were also calculated for the two chamber structures; it was found that overall efficiency of pump with guide ring is better than that without.

Engine Fleet-Management: The Use of Digital Twins From a MRO Perspective

2017 ◽  
Author(s):  
Joern Kraft ◽  
Stefan Kuntzagk
Keyword(s):  
Multilevel Models ◽  
Operating Cost ◽  
Maintenance Cost ◽  
Fleet Management ◽  
Component Level ◽  
The Real ◽  
Digital Twin ◽  
Digital Twins ◽  
The Individual ◽  
Life Consumption

Engine operating cost is a major contributor to the direct operating cost of aircraft. Therefore, the minimization of engine operating cost per flight-hour is a key aspect for airlines to operate successfully under challenging market conditions. The interaction between maintenance cost, operating cost, asset value, lease and replacement cost describes the area of conflict in which engine fleets can be optimized. State-of-the-art fleet management is based on advanced diagnostic and prognostic methods on engine and component level to provide optimized long-term removal and work-scoping forecasts on fleet level based on the individual operation. The key element of these methods is a digital twin of the active engines consisting of multilevel models of the engine and its components. This digital twin can be used to support deterioration and failure analysis, predict life consumption of critical parts and relate the specific operation of a customer to the real and expected condition of the engines on-wing and at induction to the shop. The fleet management data is constantly updated based on operational data sent from the engines as well as line maintenance and shop data. The approach is illustrated along the real application on the CFM56-5C, a mature commercial two-spool high bypass engine installed on the Airbus A340-300. It can be shown, that the new methodology results in major improvements on the considered fleets.

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