scholarly journals Simplified Indirect Estimation of Pump Flow Discharge: An Example from Serbia

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 796
Author(s):  
Milica Rašić Amon ◽  
Milan Radić ◽  
Zoran Stajić ◽  
Dejan Brkić ◽  
Pavel Praks
Keyword(s):  
Flow Rate ◽  
Flow Regulation ◽  
Limited Resources ◽  
Submersible Pump ◽  
Pump Unit ◽  
Rural Regions ◽  
Flow Discharge ◽  
Water Pumping ◽  
Simplified Method ◽  
Discharge Section

In the absence of a flowmeter or due to its inaccuracy, the flow rate at the discharge section of the pipeline following the observed pump can be roughly estimated if the pressure can be measured instead. To use the proposed procedure two main conditions should be achieved: (1) a manometer should be installed at the discharge pipeline between the pump and the flow regulation valve, and (2) the actual curve that relates pressure and flow for the observed pump unit should be known in advance. The described example is from Serbia, but it is of interest for any water pumping station with a submersible pump (installed in wells or tanks) where a limited number of adequate places for the measuring of flow are available (if any are available at all), but where the pressure at the discharge pipe of the observed pump can be measured. This simplified method can find applicability in installations in remote rural regions where limited resources are available. The results show that the calculated values of the flow obtained by the presented method deviate greatly in relation to the measured values provided by the portable ultrasonic flowmeter, up to 60% at one of the measuring points. However, in relation to the measured values provided by the permanently installed flowmeter the discrepancy is significantly lower (0.6–6.8%).

Pumpless Fuel Supply Using Pressurized Fuel Regulated by Autonomous Flow-Rate Regulation Valves

2012 ◽  
Vol 9 (3) ◽  
Author(s):  
Il Doh ◽  
Young-Ho Cho
Keyword(s):  
Fuel Cells ◽  
Flow Rate ◽  
Electrical Power ◽  
Initial Pressure ◽  
Flow Regulation ◽  
Present System ◽  
Constant Flow ◽  
Constant Flow Rate ◽  
Fuel Supply ◽  
Fuel Flow

A pumpless fuel supply using pressurized fuel with autonomous flow regulation valves is presented. Since micropumps and their control circuitry consume a portion of the electrical power generated in fuel cells, fuel supply without micropumps makes it possible to provide more efficient and inexpensive fuel cells than conventional ones. The flow regulation valves in the present system maintain the constant fuel flow rate from the pressurized fuel chamber even though the fuel pressure decreases. They autonomously adjust fluidic resistance of the channel according to fuel pressure so as to maintain constant flow rate. Compared to previous pumpless fuel supply methods, the present method offers more uniform fuel flow without any fluctuation using a simple structure. The prototypes were fabricated by a polymer micromolding process. In the experimental study using the pressurized deionized water, prototypes with pressure regulation valves showed constant flow rate of 5.38 ± 0.52 μl/s over 80 min and 5.89 ± 0.62 μl/s over 134 min, for the initial pressure in the fuel chamber of 50 and 100 kPa, respectively, while the other prototypes having the same fluidic geometry without flow regulation valves showed higher and gradually decreasing flow rate. The present pumpless fuel supply method providing constant flow rate with autonomous valve operation will be beneficial for the development of next-generation fuel cells.

Evaluating Capacitive Deionization for Measurements of the Salt-Removal of NaCl, KCl and MgCl at Various Cell Voltages

2015 ◽  
Vol 1112 ◽  
pp. 271-274 ◽  
Author(s):  
Diky Anggoro ◽  
Endarko
Keyword(s):  
Activated Carbon ◽  
Carbon Black ◽  
Polyvinyl Alcohol ◽  
Flow Rate ◽  
Glutaric Acid ◽  
Carbon Electrodes ◽  
Cross Linking ◽  
Capacitive Deionization ◽  
Submersible Pump

Carbon electrodes have been successfully synthesized and characterized for desalination system based on Capacitive Deionization (CDI) technology. The carbon electrodes were synthesized with an activated carbon (700 – 1400 m2/g), carbon black, glutaric acid and polyvinyl alcohol as a binder using cross-linking method at 120 °C. The study was to investigate salt removal percentage value of 0.1 M NaCl, MgCl and KCl using CDI cell. A solution with 0.1 M was supplied to the cell using a Boyu Submersible pump (model SP-601) at a flow rate of 10 mL/min. When potentials of 1.0, 2.0, and 3.0 V were applied to the CDI cell, the result showed that a solution of 0.1 M KCl has greater salt-removal percentage than the solutions with 0.1 M NaCl and MgCl. The salt-removal percentage of KCl was achieved at 55% for 3.0 V whilst resulted in 20 and 30% for NaCl and MgCl, respectively.

scholarly journals Co-postseismic hydrogeochemical anomalies in a volcanic environment

2003 ◽  
Vol 3 (3/4) ◽  
pp. 263-267 ◽  
Author(s):  
P. F. Biagi ◽  
O. Molchanov ◽  
R. Piccolo ◽  
A. Minafra ◽  
A. Ermini ◽  
...  
Keyword(s):  
Flow Rate ◽  
Seismic Waves ◽  
Cross Correlation ◽  
Correlation Coefficients ◽  
Underground Water ◽  
Anomalous Increase ◽  
Hypocentral Distance ◽  
Water Pumping ◽  
Natural Spring ◽  
Ks Values

Abstract. For many years flow-rate, temperature, ions and gases content data have been collected from a natural spring located in the Koryakskiy volcano area (Kamchatka, Russia). We have investigated the correlations between the hydrogeochemical data and the areal seismicity represented by the ks values (ks  is a function of magnitude and hypocentral distance) of the earthquakes. At first we smoothed the raw hydrogeochemical data using a semi-triangle weight function. Then we compared the trends of each smoothed hydrogeochemical parameter with the ks  trend using a running cross-correlation function with a maximum lag of ± 30 days and the main result was that, sometimes, we found 0.7–0.4 cross-correlation coefficients with no lag for flow rate and with + (10 – 15) days lags for some ion and gas contents. The correlation is positive, i.e. flow rate and ion and gas contents increase when ks  increases. This phenomenology could be explained by an underground water pumping produced by some earthquake. We advance the hypothesis that this pumping could be the response of the viscoelastic underground medium of the Koryakskiy volcano to seismic waves. So, sometimes, the supply of elastic energy of the earthquakes may provide the trigger to a catastrophic nucleation of bubbles of this material producing a new melt with a lower density which will tend to expand and cause a pressure increase. This pressure produces a more intensive circulation of underground water and an anomalous increase of the flow rate and subsequently anomalous increases in groundwater ions and gases content.

scholarly journals Performance influence in submersible pump with different diffuser inlet widths

2017 ◽  
Vol 9 (1) ◽  
pp. 168781401668335 ◽  
Author(s):  
Qingshun Wei ◽  
Xihuan Sun
Keyword(s):  
Flow Rate ◽  
Characteristic Curve ◽  
Practical Significance ◽  
Optimum Operating ◽  
Pump Efficiency ◽  
Submersible Pump ◽  
Pump Performance ◽  
Performance Curves ◽  
Guide Blade ◽  
Optimum Operating Point

The diffuser inlet width is a key geometric parameter that affects submersible pump performance. On the basis of diffuser characteristic curve analyses, diffusers with different inlet widths and the same impeller were equipped to construct a submersible pump model through the use of AutoCAD software. The performance curves of the submersible pump, with six diffuser inlet widths, were obtained using computational fluid dynamics method. Simultaneously, the simulation results were tested with the experimental method presented in this article. The results show that the optimum value of the inlet width ( b3 = 50 mm) is larger than the experience-based one. With an increase in the inlet width, the optimum operating point of a submersible pump offsets to a larger flow rate. When the guide blade inlet width is approximately 40–55 mm, the submersible pump efficiency is relatively high, approximately 75.9%–83.7% capacity, and the flow rate is approximately 105–135 m3/h. The numerical results of submersible pump performance are higher than those of the test results; however, their change trends have an acceptable agreement with each other. The practical significance is supplied by changing the inlet width of the diffuser to expand the scope of use.

scholarly journals ANALYSIS OF THE RESULTS OF PERFORATED DRAINAGE PIPELINES CALCULATION IN THE PRESENCE OF TRANSIT FLOW RATE

2021 ◽  
pp. 42-46
Author(s):  
Andriy Kravchuk ◽  
Oleksandr Kravchuk
Keyword(s):  
Flow Rate ◽  
Final Section ◽  
Fluid Motion ◽  
Resistance Coefficient ◽  
Main Flow ◽  
Drain Water ◽  
Transit Flow ◽  
Simplified Method ◽  
Calculation Results ◽  
The Impact

A method of calculating the error that occurs when determining the flow rate in the final section of the pressure perforated drainage pipeline when it passes transit flow rate, based on the analysis of differential equations describing the fluid motion with variable flow rate in such pipelines is proposed in the paper. The analysis is presented in dimensionless form. The impact of transit flow on the main flow is estimated using the values ​​of the drainage pipeline resistance coefficient ζl and the generalized parameter of the perforated drain A, which takes into account its constructive and filtration characteristics. The obtained calculation formulas are quite simple and easy to use. The proposed method allows to perform calculations of drainage pipelines that operate in the presence of transit flow rate, according to the method of these pipes calculation that dispose drain water without passing transit. Herewith, the possible error, which includes in the calculation results, determines. To illustrate the obtained dependences, the corresponding graphs are given in the paper. The results of the analysis allow to determine the limits within which a simplified method of calculating these pipes can be used and the error, that occurs, can be estimated

scholarly journals The Research and Development of the Amphibious Disaster-Resistant Submersible Pump with Dual Pump and Dual Motor

2014 ◽  
Vol 8 (1) ◽  
pp. 335-339
Author(s):  
Feng Yicheng
Keyword(s):  
Research And Development ◽  
Structural Features ◽  
Rotor System ◽  
Submersible Pump ◽  
Pump Unit ◽  
System A ◽  
Operational Models ◽  
Main Component ◽  
Electric Submersible Pump

This thesis introduces a kind of horizontal wet electric submersible pump unit with both submersible and nonsubmersible operational models which can be installed permanently. Then, it analyses the structural features, operating principles, main component performance and rotor system. A series of technical advantages show that this kind of submersible pump has a bright application prospect in conventional drainage and disaster-resistant emergency drainage of deep mines.

scholarly journals Optimal Operation of a Single Unit with an Adjustable Blade in an Interbasin Water Transfer Pumping Station Based on Successive Approximation Discretization for Blade Angle

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yi Gong ◽  
Jilin Cheng ◽  
Li Che ◽  
Liang Wang ◽  
Zaiyang Chen ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Dynamic Programming ◽  
Successive Approximation ◽  
Single Unit ◽  
Optimal Operation ◽  
Feasible Region ◽  
Blade Angle ◽  
Pump Unit ◽  
Step Size ◽  
Water Pumping

In the mathematical model of the optimal operation of a single pump unit with a fully adjustable blade in the Chinese South-to-North Water Diversion Project, the decision variable, namely, blade angle, was uniformly dispersed in its feasible region in a fixed step size in consideration of the requirements of the pumping head and matching motor power. 1D dynamic programming was applied to solve the original model. When the obtained blade for each time period was set as the middle reference value and the discrete region of the blade was reduced to two times of the step size in the previous time, the blade angle was correspondingly reduced and dispersed in this new discrete region, thus eliminating unnecessary optimization space. Then, 1D dynamic programming was applied again to optimize the blade angle of the single pump unit further. After a series of successive approximation discretization of the blade angle and corresponding solutions of the obtained mathematical model, the optimization process was considered completed when the given control precision met the requirement. A case study showed that under typical operating conditions, the total cost saving percentage of water pumping quantity reached 0.048%–0.463%, with an average saving rate of 0.192%. The actual total water pumping quantity of the single unit decreased by 2153 m3 on the average. The proposed discretization method exerted a better optimization effect and needed a smaller computational amount compared with traditional one-time uniform discretization in the original feasible region of the blade angle.

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