Resolution of Circulating Water Pump Problems Caused by Low River Levels at the Neal North Generating Station

2004 ◽  
Author(s):  
Kevin Calloway ◽  
Terry Larson
Keyword(s):  
Water Discharge ◽  
Axial Flow ◽  
Water Levels ◽  
Water Pump ◽  
Pump System ◽  
Circulating Water ◽  
Water Pumping ◽  
Flow Capacity ◽  
Well Water Level ◽  
Management Changes

Low winter water levels are causing reliability problems with once-through circulating water pump systems at several coal-fired power generating plants sited along the Missouri and Mississippi Rivers. River bottom degradation and potential COE river management changes make low river levels a likely on-going problem especially during drought years currently being experienced in the Midwest. This paper outlines circulating water pumping problems that have occurred at MidAmerican Energy’s Neal North Energy Center due to low water levels in the Missouri River, and the steps taken to resolve these problems. Remedial design solutions that were either considered or implemented, such as supplemental pumps, vacuum lift systems, suction scoops, a new river water intake, and converting to a closed-loop cooling tower system, will be discussed. An in-depth discussion will be made on the supplemental pump system installed in the fall of 2002 and currently in operation on the Unit 3 river intake. Applicable permitting requirements will also be discussed. The new supplemental pump system consists of six submersible axial flow pumps mounted on the front of the existing Unit 3 intake. The total flow capacity of the six supplemental pumps is around 220,000 gpm which is discharged into the existing intake to maintain an acceptable wet well water level for the existing circulating water pump to operate. Other system components include an overhead monorail system to facilitate annual supplemental pump installation/removal, a floating ice deflector system, and a warm-water discharge splash plate. The supplemental pumps are installed and operated during winter months when river levels are low, and removed during the river navigation season when the COE maintains higher river flows.

Study on 3-D Flow Field of Concrete Volute Conduit of Circulating Water Pump in Nuclear Power Plant

2011 ◽  
Vol 99-100 ◽  
pp. 350-353
Author(s):  
Xiao Bing Sun ◽  
Xu Bin Qiao
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Gradual Change ◽  
Water Pump ◽  
Pump System ◽  
Circulating Water ◽  
Operating Modes

As the largest unit capacity of nuclear power plant at present, the flow conduit of circulating water pump in EPR1750 nuclear power plant is a volute conduit, which is a cast-in-situ conceret structure with complexly gradual change cavity. Therefore, the hydraulic efficiency of circulating water pump is not only related with the design of pump leaves, but also closely related to the design of volute and the complicated spatial type of intake and outtake conduits. With the pump leaves and the intake and outtake conduits of conceret volute as the research model, based on computational fluid dynamics (CFD)and the three dimensional Reynolds averaged Navier-Stokes equations, an analytic model suitable for computation is established to simulate the three-dimensional steady flow in the whole pumping system under different operating modes. By use of the commercial fluid-computation softer ANSYS, the distribution of basic physic quantities in the fluid field inside the pump and the conduits is obtained. The analysis and prediction of the performance of pump system are made, and the spatial type design of intake and outtake conduits is evaluated. The calculation results can be referenced to improve the design of pump systems in the similar projects.

scholarly journals Design and analysis of wind pump for wind conditions in Pakistan

2019 ◽  
Vol 11 (9) ◽  
pp. 168781401988040 ◽  
Author(s):  
Tauseef Aized ◽  
Syed Muhammad Sohail Rehman ◽  
Sajid Kamran ◽  
Ali Hussain Kazim ◽  
Syed Ubaid ur Rehman
Keyword(s):  
Wind Speed ◽  
Power Output ◽  
Water Discharge ◽  
Research Work ◽  
Simulation Models ◽  
Energy Deficit ◽  
Ansys Fluent ◽  
Pump System ◽  
Wind Speed Data ◽  
Water Pumping

The unique thing about this research work is that it is the first comprehensive study out of all its kinds in Pakistan. Pakistan is an agricultural country and faces dearth of water resources availability for crops. This research work is very inevitable because it fulfils the water needs and also helps to minimize the energy deficit. This research article represents the means of wind speed data collection, design of wind-driven water pumping system and analysis of the design under different wind conditions in Pakistan. Wind speed data for province Punjab and Sindh are collected from Global Wind Atlas, Pakistan Meteorological Department and World Weather Online. First, design calculations have been made on the basis of analytical methods. Then proposed design is analysed using ANSYS Fluent Simulation models. Wind energy input, lift and drag on blades, rotor power output transmitted to the pump and water discharge from the pump have been calculated and verified from the simulation results. It has been shown that for any rotor size windmill produces maximum power output when angle between blade chord and axis of blade rotation is in the range of 23°–27°. Recommended height of windmill tower for 8–12 ft rotor diameter is 35–50 ft. Designed wind pump system can lift the ground water from 50 ft depth and discharge depends upon the size of windmill used. From the outcomes of the analysis, different designs having different power output and water pumping capacity have been proposed for different operating and wind conditions in the country.

The Effect of Booster Reflectors on the Photovoltaic Water Pumping System Performance

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
H. Tabaei ◽  
M. Ameri
Keyword(s):  
Stainless Steel ◽  
Output Power ◽  
System Performance ◽  
Aluminum Foil ◽  
Experimental Results ◽  
Water Pump ◽  
Pump System ◽  
Pumping System ◽  
Water Pumping ◽  
Stainless Steel 304

In this work, the experimental results of a designed and installed photovoltaic water pump system with static concentrator are presented. The tests have been conducted in outdoor condition in Kerman (Latitude 30 deg 17′ and longitude 57 deg 50′), Iran. The performance of photovoltaic water pumping system is evaluated for both stainless steel 304 and aluminum foil reflectors. Through this study, it is found that the performance of the photovoltaic (PV) water pumping system was improved by using these two types of reflectors; but results show that aluminum foil reflector is more efficient than stainless steel 304 reflector. Measurements indicate that output power from the PV panels can be increased in the order of 14% and 8.5% due to the use of aluminum foil and stainless steel 304 reflectors, respectively.

scholarly journals Modeling and Implementation of a PV-powered DC Water Pump System for Irrigation in Duhok City

2018 ◽  
Vol 7 (4) ◽  
pp. 228
Author(s):  
Kerry A. Sado ◽  
Lokman H. Hassan
Keyword(s):  
Fossil Fuels ◽  
Irrigation System ◽  
Water Discharge ◽  
Dc Motor ◽  
Solar Pv ◽  
Water Pump ◽  
Pump System ◽  
Agriculture Sector ◽  
Ac Motors ◽  
Complexity Cost

The agriculture sector nowadays relies mostly on conventional energy sources and traditional irrigation ways. Considering some factors such as high costs of fossil fuels and providing new power lines, especially to remote locations and where grid electricity is either inaccessible or expensive, a solar PV powered irrigation system can be a practical choice for irrigating crop fields. In this paper, a PV-powered dc water pump system design for irrigation is presented. A comprehensive comparison between Direct Current (DC) and an Alternative Current (AC) motors powered by PV is carried out in terms of power, current, water discharge and cost. Dominant factors of the system such as the effect of solar radiation on motor power, current, and water discharge are considered in this study. The optimum tilt angle for Duhok city is considered to perform this study. The specifications of PV, DC and AC motors are tested in Matlab Simulink to show the performance of the system components. The results show that DC motor is preferred over AC in term of system complexity, cost and power consumption. In contrast, water discharge of AC pump is slightly higher than the DC pump for the same time. However, overall results demonstrate the superiority of DC motor over AC.

Solar Energy Intelligent Water Pumping System Design

2013 ◽  
Vol 441 ◽  
pp. 208-211
Author(s):  
Pei Li ◽  
Xue Feng Bai ◽  
Xiao Xia Hou ◽  
Xiao Na Song ◽  
Dan Li
Keyword(s):  
Solar Energy ◽  
Water Pump ◽  
Single Chip ◽  
Pump System ◽  
Pump Operation ◽  
Pumping System ◽  
Water Pumping ◽  
Global Environmental ◽  
System Extension ◽  
Pumping Function

With the global environmental deterioration and energy crisis, for its pollution-free, noise-free, mobile simple, would not subject to geographical restrictions such as the unique advantages, solar energy will replace the tradition non-renewable energy. solar water pump system is a photo-mechanic-electronic integration system that is rapidly developed in recent years, which uses electricity from solar cells, through the controller, control the water pump, finally realize the pump operation. in this paper, the research significance, present situation,development direction and the advantages of solar energy will be introduced ,and water pump system use the single chip processor as the core, ultimately to achieve the use of solar energy and complete pumping function. And on the basis of this design, through the system extension and upgrading, with corresponding implementation agencies, can also be applied to industry.

Sizing and modelling of stand-alone photovoltaic water pumping system for irrigation

2018 ◽  
Vol 29 (4) ◽  
pp. 473-491 ◽  
Author(s):  
Santosh Singh Raghuwanshi ◽  
Vikas Khare
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Solar Photovoltaic ◽  
Water Pump ◽  
Pump System ◽  
Pumping System ◽  
Water Pumping ◽  
Integral Controller ◽  
Proportional Integral Controller ◽  
Solar Water Pump

The aim of this study is to calculate the size of the stand-alone solar photovoltaic generator and water pumping system for irrigation. In addition solar photovoltaic generator connects voltage source inverter to vector controlled induction motor-pump system. Perturb and observe method is used for harvesting maximum power of photovoltaic generator. The smooth-starting of motor-pump drive is achieved through the maximum power point tracking method. The operational performance of the solar-water-pump system is kept at 60 m head and supply daily average 35,000 L/day. In this paper result is validated by the comparison fuzzy logic controller and proportional-integral controller, driven by solar-motor-pump system. The results confirmed that fuzzy logic controller based pumping system gives more accurate results as compared to proportional-integral controller based motor-pump system. The fuzzy logic controller increases the accuracy and efficiency of the solar-water-pump system.

scholarly journals Analisa Performansi Photovoltaic 200 WP dan Pompa Air Dc pada Implementasi Sistem Pembangkit Listrik Tenaga Surya (PLTS)

2021 ◽  
Vol 21 (3) ◽  
pp. 1197
Author(s):  
Marshal Jawahar Al Nehru ◽  
Bengawan Alfaresi ◽  
Feby Ardianto
Keyword(s):  
Solar Power ◽  
Water Discharge ◽  
Water Pump ◽  
Solar Panels ◽  
Generation System ◽  
Pump System ◽  
Solar Power Generation ◽  
Pv Module ◽  
Human Need ◽  
Power Generation System

Water is one of the most widely used natural products by humans, such as for daily needs for drinking, cooking, bathing, washing and others, even industry, agriculture, offices all need water. Water is a basic human need, but it is still found in some areas with limited and difficult to reach water sources. This study aims to analyze the performance of photovoltaic (solar panels) and the results of the electric pump in the implementation of a solar power generation system (PLTS). In this study, designing a solar power plant (PLTS) that is connected to a solar charge controller and connected directly to a water pump system using a battery as a source. Based on the results of the study, it shows that the higher the solar radiation, the higher the output power of the 200 Wp PV module. Likewise, changes in reservoir height greatly affect changes in water discharge and currents. The higher the reservoir well distance, the smaller the water discharge and the higher the reservoir well distance also affects the increase in current.

scholarly journals Performance and Economic Analysis of Solar Water Pump System Laboratory Scale

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Usman Usman ◽  
Alang Sunding ◽  
Akbar Naro Parawangsa
Keyword(s):  
Solar Radiation ◽  
Economic Analysis ◽  
Water Discharge ◽  
Analysis Data ◽  
Pump Efficiency ◽  
Water Pump ◽  
Pump System ◽  
Solar Water Pump ◽  
Time Required ◽  
Different Characteristics

The dependence of solar radiation in generating electricity by PV will have an impact on the PVWPS performance, besides The PVWPS consists many components with different characteristics. Thus this research will investigation the performance conduct economic analysis of PVWPS. To achieve that objective measurement of data starting at 09.00 until 16.00. The data are solar radiation, voltage and current of PV/pump and the time required to fill the container with a certain volume. Analysis data is using the equations that have been predetermined and comparison other research. The results obtained that the water discharge generated by PVWPS will be proportional to solar radiation, as a result the production of electricity generated by PV. The pump efficiency and system is proportional to solar radiation. This phenomenon is the effect of water debit dependence on solar radiation. The result of economic analysis is the price of electricity generated by SPATS is relatively cheap and the water cost for every m3 is inversely proportional to the water discharge generated by the pump.

Design & Real-time Implementation of MIDO Converter Based PV Water Pumping System with BES

2020 ◽  
Vol 14 (2) ◽  
pp. 194-204
Author(s):  
Anuradha Tomar
Keyword(s):  
Real Time ◽  
Rural Areas ◽  
Maximum Power ◽  
Pump System ◽  
Partial Shading ◽  
Power Extraction ◽  
Pumping System ◽  
Point Tracking ◽  
Water Pumping ◽  
Battery Energy

Background: Despite so many developments, most of the farmers in the rural areas are still dependent on rainwater, rivers or water wells, for irrigation, drinking water etc. The main reason behind such dependency is non-connectivity with the National grid and thus unavailability of electricity. To extract the maximum power from solar photovoltaic (SPV) based system, implementation of Maximum Power Point Tracking (MPPT) is mandatory. PV power is intermittent in nature. Variation in the irradiation level due to partial shading or mismatching phenomena leads to the development of modular DC-DC converters. Methods: A stand-alone Multi-Input Dual-Output (MIDO) DC-DC converter based SPV system, is installed at a farm; surrounded with plants for water pumping with stable flow (not pulsating) along with battery energy storage (BES) for lighting. The proposed work has two main objectives; first to maximize the available PV power under shadowing and mismatching condition in case of series/ parallel connected PV modules and second is to improve the utilization of available PV energy with dual loads connected to it. Implementation of proposed MIDO converter along with BES addresses these objectives. First, MIDO controller ensures the MPPT operation of the SPV system to extract maximum power even under partial shading condition and second, controls the power supplied to the motor-pump system and BES. The proposed system is simulated in MATLAB/ SIMULINK environment. Real-time experimental readings under natural sun irradiance through hardware set-up are also taken under dynamic field conditions to validate the performance. Results and Conclusion: The inherent advantage of individual MPPT of each PV source in MIDO configuration, under varying shadow patterns due to surrounding plants and trees is added to common DC bus and therefore provides a better impact on PV power extraction as compared to conventional PV based water pumping system. Multi-outputs at different supply voltages is another flag of MIDO system. Both these aspects are implemented and working successfully at 92.75% efficiency.

Foetal bypass: concepts and controversies

Perfusion ◽  
1998 ◽  
Vol 13 (2) ◽  
pp. 111-117 ◽  
Author(s):  
Joseph J Sistino
Keyword(s):  
Heart Defects ◽  
Open Heart Surgery ◽  
Axial Flow ◽  
Right Atrial ◽  
Cyclooxygenase Inhibitors ◽  
Pump System ◽  
Maternal Risk ◽  
Valvular Stenosis ◽  
Axial Flow Pump ◽  
Flow Pump

One of the most controversial and challenging surgical undertakings of the next century promises to be foetal cardiac surgery. Animal studies have been underway for several years to gain an understanding of the physiological mechanisms required to achieve this undertaking. Not since the days of crosscirculation has there been a maternal risk associated with open-heart surgery. The diagnosis of congenital heart defects with foetal ultrasound can now be made as early as 12 weeks gestation. Simple cardiac abnormalities, such as valvular stenosis or atresia, alter intracardiac flow patterns and affect normal cardiac chamber development. Without early intervention, these complex lesions often require major surgical reconstruction, beginning in the neonatal period. Foetal cardiac bypass techniques have evolved from the use of roller pumps and bubble oxygenators primed with maternal blood to the use of an axial flow pump incorporated in a right atrial to pulmonary artery or aortic shunt. Because the blood entering the right atrium is oxygenated by the placenta, an oxygenator in the bypass circuit is probably not needed. The low prime axial flow pump system avoids the dilution of the foetus with the maternal adult haemoglobin and improves the outcome. A major focus of research has concentrated on maintenance of placental blood flow with the use of vasodilators and cyclooxygenase inhibitors. Investigation with primates will be necessary to confirm the placental physiology before human operations can be performed. As the foetal bypass challenges are overcome, there is the potential for a reduction in the number of complex cardiac lesions requiring early surgical intervention in the twenty-first century.

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