National Library of Energy BETA

Sample records for two-way power flow

  1. Fluid-particle flow modelling and validation using two-way-coupled mesoscale SPH-DEM

    E-Print Network [OSTI]

    Robinson, Martin; Ramaioli, Marco

    2013-01-01

    We present a meshless simulation method for multiphase fluid-particle flows coupling Smoothed Particle Hydrodynamics (SPH) and the Discrete Element Method (DEM). Rather than fully resolving the interstitial fluid, which is often infeasible, the unresolved fluid model is based on the locally averaged Navier Stokes equations, which are coupled with a DEM model for the solid phase. In contrast to similar mesh-based Discrete Particle Methods (DPMs), this is a purely particle-based method and enjoys the flexibility that comes from the lack of a prescribed mesh. It is suitable for problems such as free surface flow or flow around complex, moving and/or intermeshed geometries. It can be used for both one and two-way coupling and is applicable to both dilute and dense particle flows. A comprehensive validation procedure for fluid-particle simulations is presented and applied to the SPH-DEM method, using simulations of single and multiple particle sedimentation in a 3D fluid column and comparison with analytical model...

  2. Numerical studies on two-way coupled fluid flow and geomechanics in hydrate deposits

    E-Print Network [OSTI]

    Kim, J.

    2014-01-01

    A. 2008. Modeling of Geomechanics in Naturally Fracturedcoupling porous flow and geomechanics. Soc. Pet. Eng. J. 11(a reservoir simulator and a geomechanics module. Soc. Pet.

  3. Structural power flow measurement

    SciTech Connect (OSTI)

    Falter, K.J.; Keltie, R.F.

    1988-12-01

    Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.

  4. The Analysis of Two-Way Functional Data Using Two-Way Regularized

    E-Print Network [OSTI]

    Buja, Andreas

    vectors in the singular value decomposition (SVD) of the data matrix. We focus on a penalization approach and solve the non-trivial problem of constructing proper two-way penalties from one-way regression penalties as part of an alternating optimization algorithm. In addition to the penalization approach, we briefly

  5. Primus Power's Flow Battery Powered by $11 Million in Private...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Primus Power's Flow Battery Powered by 11 Million in Private Investment Primus Power's Flow Battery Powered by 11 Million in Private Investment June 14, 2011 - 10:00am Addthis...

  6. Two-way Immersion Bilingual Programs in Texas 

    E-Print Network [OSTI]

    Galloway, Martha; Lara-Alecio, Rafael; Irby, Beverly J.; Rodriguez, Linda; Gomez, Leo

    2010-10-22

    -2001 school year the Texas Two-way Consortium (TTC), a group of Texas educators, administrators, and concerned citizens, began collecting two-way program data by paper survey distributed at state and regional bilingual education conferences. The TTC...

  7. gtp_flow_power_estimator.xlsx

    Broader source: Energy.gov [DOE]

    This simple spreadsheet model estimates either the flow rate required to produce a specified level of power output, or the power output that can be produced from a specified flow rate.

  8. Entanglement purification with two-way classical communication

    E-Print Network [OSTI]

    Alan W. Leung; Peter W. Shor

    2007-02-21

    We present an improved protocol for entanglement purification of bipartite mixed states. The protocol requires two-way classical communication and hence implies an improved lower bound on the quantum capacity with two-way classical communication of the quantum depolarizing channel.

  9. Optimal Demand Response and Power Flow

    E-Print Network [OSTI]

    Willett, Rebecca

    Optimal Demand Response and Power Flow Steven Low Computing + Math Sciences Electrical Engineering #12;Outline Optimal demand response n With L. Chen, L. Jiang, N. Li Optimal power flow n With S. Bose;Optimal demand response Model Results n Uncorrelated demand: distributed alg n Correlated demand

  10. Optimum Transmission Policies for Energy Harvesting Two-way Relay Channels

    E-Print Network [OSTI]

    Yener, Aylin

    Optimum Transmission Policies for Energy Harvesting Two-way Relay Channels Kaya Tutuncuoglu, Burak for energy harvesting networks with a focus on efficient power allocation policies. A single link model with an energy harvesting trans- mitter is considered in [1] for which the policy minimizing transmission

  11. Energy Cooperation in Energy Harvesting Two-Way Communications

    E-Print Network [OSTI]

    Ulukus, Sennur

    Energy Cooperation in Energy Harvesting Two-Way Communications Berk Gurakan1 , Omur Ozel1 , Jing energy from nature and energy can be transferred in one-way from one of the users to the other. Energy and users have unlimited batteries to store energy for future use. In addition, there is a separate wireless

  12. Two Ways to Common Knowledge Samuel Bucheli1,2

    E-Print Network [OSTI]

    Jäger, Gerhard

    M4M 2009 Two Ways to Common Knowledge Samuel Bucheli1,2 Roman Kuznets1,2 Thomas Studer2 Institut f Science Foundation grant 200021­117699. 2 Emails: {bucheli, kuznets, tstuder}@iam.unibe.ch This paper.elsevier.com/locate/entcs #12;Bucheli, Kuznets and Studer the infinitary conjunction everybody knows A and everybody knows

  13. Hybrid Wind Power Balance Control Strategy using Thermal Power, Hydro Power and Flow Batteries

    E-Print Network [OSTI]

    MacDonald, Mark

    Hybrid Wind Power Balance Control Strategy using Thermal Power, Hydro Power and Flow Batteries the con- trolled use of hybrid flow battery, thermal and hydro power plant system, to support wind power on range of thermal and hydro power plant reaction times. This work suggests that power and energy

  14. Method of preparing a two-way shape memory alloy

    DOE Patents [OSTI]

    Johnson, Alfred D. (5383 Bancroft Ave., Oakland, CA 94601)

    1984-01-01

    A two-way shape memory alloy, a method of training a shape memory alloy, and a heat engine employing the two-way shape memory alloy to do external work during both heating and cooling phases. The alloy is heated under a first training stress to a temperature which is above the upper operating temperature of the alloy, then cooled to a cold temperature below the zero-force transition temperature of the alloy, then deformed while applying a second training stress which is greater in magnitude than the stress at which the alloy is to be operated, then heated back to the hot temperature, changing from the second training stress back to the first training stress.

  15. Method of preparing a two-way shape memory alloy

    DOE Patents [OSTI]

    Johnson, A.D.

    1984-03-06

    A two-way shape memory alloy, a method of training a shape memory alloy, and a heat engine employing the two-way shape memory alloy to do external work during both heating and cooling phases are disclosed. The alloy is heated under a first training stress to a temperature which is above the upper operating temperature of the alloy, then cooled to a cold temperature below the zero-force transition temperature of the alloy, then deformed while applying a second training stress which is greater in magnitude than the stress at which the alloy is to be operated, then heated back to the hot temperature, changing from the second training stress back to the first training stress. 8 figs.

  16. Magnetic Amplifier for Power Flow Control

    SciTech Connect (OSTI)

    2012-02-24

    GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNL’s controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNL’s device could serve as a low-cost alternative that is equally adept at regulating power flow.

  17. A vortex level set method for the two-way coupling of an incompressible fluid with colliding rigid bodies

    E-Print Network [OSTI]

    Cottet, Georges-Henri

    in a non laminar flow. Here we consider a different approach. The fluid­ solid system is considered rights reserved. Keywords: Incompressible flow; Fluid­solid interaction; Vortex method; Level set methodA vortex level set method for the two-way coupling of an incompressible fluid with colliding rigid

  18. Symmetry breaking in optimal timing of traffic signals on an idealized two-way street

    E-Print Network [OSTI]

    Panaggio, Mark J; Hu, Peiguang; Abrams, Daniel M

    2013-01-01

    Simple physical models based on fluid mechanics have long been used to understand the flow of vehicular traffic on freeways; analytically tractable models of flow on an urban grid, however, have not been as extensively explored. In an ideal world, traffic signals would be timed such that consecutive lights turned green just as vehicles arrived, eliminating the need to stop at each block. Unfortunately, this "green wave" scenario is generally unworkable due to frustration imposed by competing demands of traffic moving in different directions. Until now this has typically been resolved by numerical simulation and optimization. Here, we develop a theory for the flow in an idealized system consisting of a long two-way road with periodic intersections. We show that optimal signal timing can be understood analytically and that there are counter-intuitive asymmetric solutions to this signal coordination problem. We further explore how these theoretical solutions degrade as traffic conditions vary and automotive dens...

  19. Types of Data Pie Charts Bar Charts Two-way Tables Displaying Data

    E-Print Network [OSTI]

    Watkins, Joseph C.

    Types of Data Pie Charts Bar Charts Two-way Tables Topic 1 Displaying Data Categorical Data 1 / 13 #12;Types of Data Pie Charts Bar Charts Two-way Tables Outline Types of Data Pie Charts Bar Charts Two-way Tables Segmented Bar Chart 2 / 13 #12;Types of Data Pie Charts Bar Charts Two-way Tables Types of Data

  20. Flow reversal power limit for the HFBR

    SciTech Connect (OSTI)

    Cheng, L.Y.; Tichler, P.R.

    1997-01-01

    The High Flux Beam Reactor (HFBR) is a pressurized heavy water moderated and cooled research reactor that began operation at 40 MW. The reactor was subsequently upgraded to 60 MW and operated at that level for several years. The reactor undergoes a buoyancy-driven reversal of flow in the reactor core following certain postulated accidents. Questions which were raised about the afterheat removal capability during the flow reversal transition led to a reactor shutdown and subsequent resumption of operation at a reduced power of 30 MW. An experimental and analytical program to address these questions is described in this report. The experiments were single channel flow reversal tests under a range of conditions. The analytical phase involved simulations of the tests to benchmark the physical models and development of a criterion for dryout. The criterion is then used in simulations of reactor accidents to determine a safe operating power level. It is concluded that the limit on the HFBR operating power with respect to the issue of flow reversal is in excess of 60 MW. Direct use of the experimental results and an understanding of the governing phenomenology supports this conclusion.

  1. Keeping the Power Flowing | Department of Energy

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousand Cubic Feet) SoldDepartment of EnergyPower Flowing

  2. Distributed Power Flow Control: Distributed Power Flow Control using Smart Wires for Energy Routing

    SciTech Connect (OSTI)

    2012-04-24

    GENI Project: Smart Wire Grid is developing a solution for controlling power flow within the electric grid to better manage unused and overall transmission capacity. The 300,000 miles of high-voltage transmission line in the U.S. today are congested and inefficient, with only around 50% of all transmission capacity utilized at any given time. Increased consumer demand should be met in part with more efficient and an economical power flow. Smart Wire Grid’s devices clamp onto existing transmission lines and control the flow of power within—much like how internet routers help allocate bandwidth throughout the web. Smart wires could support greater use of renewable energy by providing more consistent control over how that energy is routed within the grid on a real-time basis. This would lessen the concerns surrounding the grid’s inability to effectively store intermittent energy from renewables for later use.

  3. The Two Way Flow of Wood Carbon vs the One-Way Flow

    E-Print Network [OSTI]

    Brown, Sally

    Product Carbon Emissions: Floor Structure (kg CO2/m2) Net Product Carbon Emissions: Floor Structure (kg CO2/m2) #12;Comparison of AlternativesComparison of Alternatives 1 5 #12;Source: http://www;#12;Comparison of AlternativesComparison of Alternatives 1 9 Meta Substitution Ave: C:C 2.1:1 CO2:bdt 3.8CO2/bdt

  4. Two-way communication is even more important today

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking With WIPP UPDATE: April 15, 2014Twodimensional timeKurt's Column

  5. Power Flow Controller for Renewables: Transformer-less Unified Power Flow Controller for Wind and Solar Power Transmission

    SciTech Connect (OSTI)

    2012-02-08

    GENI Project: MSU is developing a power flow controller to improve the routing of electricity from renewable sources through existing power lines. The fast, innovative, and lightweight circuitry that MSU is incorporating into its controller will eliminate the need for a separate heavy and expensive transformer, as well as the construction of new transmission lines. MSU’s controller is better suited to control power flows from distributed and intermittent wind and solar power systems than traditional transformer-based controllers are, so it will help to integrate more renewable energy into the grid. MSU‘s power flow controller can be installed anywhere in the existing grid to optimize energy transmission and help reduce transmission congestion.

  6. Increased Power Generation in a Continuous Flow MFC with

    E-Print Network [OSTI]

    Increased Power Generation in a Continuous Flow MFC with Advective Flow through the Porous Anode, The Pennsylvania State University, University Park, Pennsylvania 16802 The maximum power generated in a single without affecting power generation (16). Pt can be replaced by less expensive alternatives such as Co

  7. Distributed Algorithms for Optimal Power Flow Problem

    E-Print Network [OSTI]

    Lam, Albert Y S; Tse, David

    2011-01-01

    Optimal power flow (OPF) is an important problem for power generation and it is in general non-convex. With the employment of renewable energy, it will be desirable if OPF can be solved very efficiently so its solution can be used in real time. With some special network structure, e.g. trees, the problem has been shown to have a zero duality gap and the convex dual problem yields the optimal solution. In this paper, we propose a primal and a dual algorithm to coordinate the smaller subproblems decomposed from the convexified OPF. We can arrange the subproblems to be solved sequentially and cumulatively in a central node or solved in parallel in distributed nodes. We test the algorithms on IEEE radial distribution test feeders, some random tree-structured networks, and the IEEE transmission system benchmarks. Simulation results show that the computation time can be improved dramatically with our algorithms over the centralized approach of solving the problem without decomposition, especially in tree-structured...

  8. Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow

    E-Print Network [OSTI]

    Marchese, Francis

    Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow

  9. Human Factors Aspects of Power System Flow Animation

    E-Print Network [OSTI]

    Human Factors Aspects of Power System Flow Animation Douglas A. Wiegmann, Gavin R. Essenberg experimental results associated with human factors aspects of using animation to display electric power system. Index Terms--Power System Operations and Planning, Power System Visualization, Animation, Human Factors

  10. Fast Power Flow Methods 1.0 Introduction

    E-Print Network [OSTI]

    McCalley, James D.

    1 Fast Power Flow Methods 1.0 Introduction What we have learned so far is the so-called "full that with a NR. But NR is slow! Often, the problem is not so "tough," and in that case, the so-called fast is fast and robust, it is not very accurate. Solving the power flow equations can be computationally

  11. Development of design guidelines for two-lane, two-way rural highways in Texas 

    E-Print Network [OSTI]

    Raghupathy, Selvam

    2001-01-01

    the risk of crashes due to potential dangerous overtaking maneuvers attempted by some motorists. This research focused on obtaining the optimal design length and spacing of passing lanes on two-lane, two-way rural highways, for various two-way volumes...

  12. Energy Harvesting Two-Way Communications with Limited Energy and Data Storage

    E-Print Network [OSTI]

    Yener, Aylin

    Energy Harvesting Two-Way Communications with Limited Energy and Data Storage Burak Varan Aylin, we study two-way communication scenarios with energy harvesting. In particular, we consider the two with finite batteries and finite data buffers. This entails iteratively solving an energy problem, which

  13. The Energy Harvesting and Energy Cooperating Two-way Channel with Finite-Sized Batteries

    E-Print Network [OSTI]

    Yener, Aylin

    The Energy Harvesting and Energy Cooperating Two-way Channel with Finite-Sized Batteries Kaya@ee.psu.edu Abstract--In this paper, we consider the energy allocation problem for energy harvesting and energy problem in a two-way channel with energy harvesting nodes that can also transfer energy to one another

  14. On the Energy-Delay Trade-off of a Two-Way Relay Network

    E-Print Network [OSTI]

    Yener, Aylin

    1 On the Energy-Delay Trade-off of a Two-Way Relay Network Xiang He Aylin Yener Wireless relay. The bi-directional nature of the traffic, in this setting, poses a new energy delay trade, queuing, energy-delay trade-off I. INTRODUCTION The two-way relay network considered in this work consists

  15. Two-Way and Multiple-Access Energy Harvesting Systems with Energy Cooperation

    E-Print Network [OSTI]

    Ulukus, Sennur

    Two-Way and Multiple-Access Energy Harvesting Systems with Energy Cooperation Berk Gurakan1 , Omur, Fayetteville, AR 72701 Abstract--We study the capacity regions of two-way and multiple-access energy harvesting communication systems with one-way wireless energy transfer. In these systems, energy re- quired for data

  16. BiogeographyBiogeography--Based OptimizationBased Optimization of Power Flowof Power Flow

    E-Print Network [OSTI]

    Simon, Dan

    and phase angle vectors: 60 unknowns #12;7 Power Flow ProblemPower Flow Problem Cost Function = Power / Voltage Mismatch (Ideally = 0) ( ) ( ) ( ){ }2 2 2 min i Q i V i i Gen i PQ i PV P Q V + + V, V, V = - = - - = + - = + - a b #12;12 Simulation GA and BBO Performance ( )cost cost individual, generation, trial= ind trial gen

  17. DC Optimal Power Flow: Uniqueness and Chee Wei Tan

    E-Print Network [OSTI]

    Tan, Chee Wei

    the minimization of power transmission loss in DC-OPF and char- acterize the uniqueness of its solutions. This hasDC Optimal Power Flow: Uniqueness and Algorithms Chee Wei TanÝ , Desmond W. H. CaiŁ and Xin LouÝ Ý and transmission loss in a power net- work subject to physical constraints governed by Kirchhoff's and Ohm's law [1

  18. Contingency Analysis of Power System using Power Flow

    E-Print Network [OSTI]

    Lavaei, Javad

    and to minimize customer outages. i II. Motivation The security of a power grid into account. The other common causes of faults are weather related.0 ­ Typical Causes of Faults iii Source: Richard Brown. Electric Power Distribution

  19. Successful African American students in two-way immersion programs: parent and student perceptions 

    E-Print Network [OSTI]

    Boone, Sonia Kay

    2009-05-15

    The purpose of this study was to examine perceptions of possible factors that lead to academic success for African American children who participated in two-way immersion programs. In order to examine the perceptions, the ...

  20. Computing an operating parameter of a unified power flow controller

    DOE Patents [OSTI]

    Wilson, David G; Robinett, III, Rush D

    2015-01-06

    A Unified Power Flow Controller described herein comprises a sensor that outputs at least one sensed condition, a processor that receives the at least one sensed condition, a memory that comprises control logic that is executable by the processor; and power electronics that comprise power storage, wherein the processor causes the power electronics to selectively cause the power storage to act as one of a power generator or a load based at least in part upon the at least one sensed condition output by the sensor and the control logic, and wherein at least one operating parameter of the power electronics is designed to facilitate maximal transmittal of electrical power generated at a variable power generation system to a grid system while meeting power constraints set forth by the electrical power grid.

  1. Does the Poynting vector always represent electromagnetic power flow?

    E-Print Network [OSTI]

    Changbiao Wang

    2015-07-07

    Poynting vector as electromagnetic power flow has prevailed over one hundred years in the community. However in this paper, it is shown from Maxwell equations that the Poynting vector may not represent the electromagnetic power flow for a plane wave in a non-dispersive, lossless, non-conducting, anisotropic uniform medium; this important conclusion revises the conventional understanding of Poynting vector. It is also shown that this conclusion is clearly supported by Fermat's principle and special theory of relativity.

  2. Does the Poynting vector always represent electromagnetic power flow?

    E-Print Network [OSTI]

    Wang, Changbiao

    2015-01-01

    Poynting vector as electromagnetic power flow has prevailed over one hundred years in the community. However in this paper, it is shown from Maxwell equations that the Poynting vector may not represent the electromagnetic power flow for a plane wave in a non-dispersive, lossless, non-conducting, anisotropic uniform medium; this important conclusion revises the conventional understanding of Poynting vector. It is also shown that this conclusion is clearly supported by Fermat's principle and special theory of relativity.

  3. Lithium Mass Flow Control for High Power Lorentz Force Accelerators

    E-Print Network [OSTI]

    Lithium Mass Flow Control for High Power Lorentz Force Accelerators Andrea D. Kodys1 , Gregory Laboratory, Pasadena, CA 91109 (609).258.5220, choueiri@princeton.edu Abstract. A lithium feeding system has been developed to measure and control propellant flow for 30-200 kW Lithium Lorentz Force Accelerators

  4. Global Optimization of Optimal Power Flow

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    Multi-Period OPF ­ `Smart Grid' · Transmission short falls due to ­ Fluctuating demands. ­ Integrating/03/2013 2 AC-OPF definition · Given: Topology of the power grid: generators, loads, power lines. · Objective: ­ Find operating points for generators, (PG,QG) ­ Minimizing cost of generation ­ f(PG) · Satisfy

  5. Transaction Based Power Flow Analysis For Transmission Utilization Allocation

    E-Print Network [OSTI]

    electricity market at the ex ante phase; (ii) MW generations are decided by bilateral contracts and other contributions of individual generators to loads and flows upon the so-called proportional sharing principle the electric power industry moves into an era of supply competition and consumer choice, the power system

  6. Free Flow Power Corporation | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdistoWhiskeyFootprint Ventures JumpIndiana:BuildingPower Corporation

  7. Multiple Access and Two-way Channels with Energy Harvesting and Bi-directional

    E-Print Network [OSTI]

    Yener, Aylin

    Multiple Access and Two-way Channels with Energy Harvesting and Bi-directional Energy Cooperation transmitters that can cooperate by transferring energy to each other. Specifically, the jointly optimal-directional extension of the energy cooperation model is considered. Using an equivalent energy transfer efficiency

  8. Dynamic Power Flow Controller: Compact Dynamic Phase Angle Regulators for Transmission Power Routing

    SciTech Connect (OSTI)

    2012-01-03

    GENI Project: Varentec is developing compact, low-cost transmission power controllers with fractional power rating for controlling power flow on transmission networks. The technology will enhance grid operations through improved use of current assets and by dramatically reducing the number of transmission lines that have to be built to meet increasing contributions of renewable energy sources like wind and solar. The proposed transmission controllers would allow for the dynamic control of voltage and power flow, improving the grid’s ability to dispatch power in real time to the places where it is most needed. The controllers would work as fail-safe devices whereby the grid would be restored to its present operating state in the event of a controller malfunction instead of failing outright. The ability to affordably and dynamically control power flow with adequate fail-safe switchgear could open up new competitive energy markets which are not possible under the current regulatory structure and technology base.

  9. Two way coupling RAM-SCB to the space weather modeling framework

    SciTech Connect (OSTI)

    Welling, Daniel T [Los Alamos National Laboratory; Jordanova, Vania K [Los Alamos National Laboratory; Zaharia, Sorin G [Los Alamos National Laboratory; Toth, Gabor [UNIV OF MICHIGAN

    2010-12-03

    The Ring current Atmosphere interaction Model with Self-Consistently calculated 3D Magnetic field (RAM-SCB) has been used to successfully study inner magnetosphere dynamics during different solar wind and magnetosphere conditions. Recently, one way coupling of RAM-SCB with the Space Weather Modeling Framework (SWMF) has been achieved to replace all data or empirical inputs with those obtained through first-principles-based codes: magnetic field and plasma flux outer boundary conditions are provided by the Block Adaptive Tree Solar wind Roe-type Upwind Scheme (BATS-R-US) MHO code, convection electric field is provided by the Ridley Ionosphere Model (RIM), and ion composition is provided by the Polar Wind Outflow Model (PWOM) combined with a multi-species MHO approach. These advances, though creating a powerful inner magnetosphere virtual laboratory, neglect the important mechanisms through which the ring current feeds back into the whole system, primarily the stretching of the magnetic field lines and shielding of the convection electric field through strong region two Field Aligned Currents (FACs). In turn, changing the magnetosphere in this way changes the evolution of the ring current. To address this shortcoming, the coupling has been expanded to include feedback from RAM-SCB to the other coupled codes: region two FACs are returned to the RIM while total plasma pressure is used to nudge the MHO solution towards the RAMSCB values. The impacts of the two way coupling are evaluated on three levels: the global magnetospheric level, focusing on the impact on the ionosphere and the shape of the magnetosphere, the regional level, examining the impact on the development of the ring current in terms of energy density, anisotropy, and plasma distribution, and the local level to compare the new results to in-situ measurements of magnetic and electric field and plasma. The results will also be compared to past simulations using the one way coupling and no coupling whatsoever. This work is the first to fully couple an anisotropic kinetic ring current code with a selfconsistently calculated magnetic field to a set of global models.

  10. Optimal Power Flow Based Demand Response Offer Price Optimization

    E-Print Network [OSTI]

    Lavaei, Javad

    Optimal Power Flow Based Demand Response Offer Price Optimization Zhen Qiu 1 Introduction-time energy balance. Demand response programs are offered by the utility companies to reduce the load response cost in exchange for load reduction. A considerable amount of papers have discussed the demand

  11. Thermal Unit Commitment Including Optimal AC Power Flow Constraints

    E-Print Network [OSTI]

    Thermal Unit Commitment Including Optimal AC Power Flow Constraints Carlos Murillo{Sanchez Robert J algorithm for unit commitment that employs a Lagrange relaxation technique with a new augmentation. This framework allows the possibility of committing units that are required for the VArs that they can produce

  12. Power flow analysis for amplifier design and energy harvesting

    E-Print Network [OSTI]

    Lindner, Douglas K.

    . In order to improve the efficiency of an active isolation system we analyze different feedback control energy on a active vibration isolation system it is important to understand the influence of the existingPower flow analysis for amplifier design and energy harvesting Nikola Vujica, Donald J. Leoa

  13. Exact Convex Relaxation of Optimal Power Flow in Radial Networks

    SciTech Connect (OSTI)

    Gan, LW; Li, N; Topcu, U; Low, SH

    2015-01-01

    The optimal power flow (OPF) problem determines a network operating point that minimizes a certain objective such as generation cost or power loss. It is nonconvex. We prove that a global optimum of OPF can be obtained by solving a second-order cone program, under a mild condition after shrinking the OPF feasible set slightly, for radial power networks. The condition can be checked a priori, and holds for the IEEE 13, 34, 37, 123-bus networks and two real-world networks.

  14. Probabilistic Vulnerability Assessment Based on Power Flow and Voltage Distribution

    SciTech Connect (OSTI)

    Ma, Jian; Huang, Zhenyu; Wong, Pak C.; Ferryman, Thomas A.

    2010-04-30

    Risk assessment of large scale power systems has been an important problem in power system reliability study. Probabilistic technique provides a powerful tool to solve the task. In this paper, we present the results of a study on probabilistic vulnerability assessment on WECC system. Cumulant based expansion method is applied to obtain the probabilistic distribution function (PDF) and cumulative distribution function (CDF) of power flows on transmission lines and voltage. Overall risk index based on the system vulnerability analysis is calculated using the WECC system. The simulation results based on WECC system is used to demonstrate the effectiveness of the method. The methodology can be applied to the risk analysis on large scale power systems.

  15. Primary Side Power Flow Control of Wireless Power Transfer for Electric Vehicle Charging

    SciTech Connect (OSTI)

    Miller, John M; Onar, Omer C; Chinthavali, Madhu Sudhan

    2015-01-01

    Various noncontacting methods of plug-in electric vehicle charging are either under development or now deployed as aftermarket options in the light-duty automotive market. Wireless power transfer (WPT) is now the accepted term for wireless charging and is used synonymously for inductive power transfer and magnetic resonance coupling. WPT technology is in its infancy; standardization is lacking, especially on interoperability, center frequency selection, magnetic fringe field suppression, and the methods employed for power flow regulation. This paper proposes a new analysis concept for power flow in WPT in which the primary provides frequency selection and the tuned secondary, with its resemblance to a power transmission network having a reactive power voltage control, is analyzed as a transmission network. Analysis is supported with experimental data taken from Oak Ridge National Laboratory s WPT apparatus. This paper also provides an experimental evidence for frequency selection, fringe field assessment, and the need for low-latency communications in the feedback path.

  16. A Formal Model for Verifying the Impact of Stealthy Attacks on Optimal Power Flow in Power Grids

    E-Print Network [OSTI]

    Wang, Yongge

    - mal Power Flow; Formal Model 1. INTRODUCTION Power system control centers employ a numberA Formal Model for Verifying the Impact of Stealthy Attacks on Optimal Power Flow in Power Grids the integrity of OPF and undermine the economic and secure system operation. We present a formal verification

  17. Resistive Network Optimal Power Flow: Uniqueness and Algorithms

    SciTech Connect (OSTI)

    Tan, CW; Cai, DWH; Lou, X

    2015-01-01

    The optimal power flow (OPF) problem minimizes the power loss in an electrical network by optimizing the voltage and power delivered at the network buses, and is a nonconvex problem that is generally hard to solve. By leveraging a recent development on the zero duality gap of OPF, we propose a second-order cone programming convex relaxation of the resistive network OPF, and study the uniqueness of the optimal solution using differential topology, especially the Poincare-Hopf Index Theorem. We characterize the global uniqueness for different network topologies, e.g., line, radial, and mesh networks. This serves as a starting point to design distributed local algorithms with global behaviors that have low complexity, are computationally fast, and can run under synchronous and asynchronous settings in practical power grids.

  18. Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson...

    Open Energy Info (EERE)

    signal, optimal power flow and economic dispatch The proposed method stabilized the power grid, reduced the marginal cost of electricity, and increased the marginal cost of...

  19. Passive faraday mirror attack in practical two-way quantum key distribution system

    E-Print Network [OSTI]

    Shi-Hai Sun; Mu-Sheng Jiang; Lin-Mei Liang

    2012-03-04

    The faraday mirror (FM) plays a very important role in maintaining the stability of two way plug-and-play quantum key distribution (QKD) system. However, the practical FM is imperfect, which will not only introduce additional quantum bit error rate (QBER) but also leave a loophole for Eve to spy the secret key. In this paper, we propose a passive faraday mirror attack in two way QKD system based on the imperfection of FM. Our analysis shows that, if the FM is imperfect, the dimension of Hilbert space spanned by the four states sent by Alice is three instead of two. Thus Eve can distinguish these states with a set of POVM operators belonging to three dimension space, which will reduce the QBER induced by her attack. Furthermore, a relationship between the degree of the imperfection of FM and the transmittance of the practical QKD system is obtained. The results show that, the probability that Eve loads her attack successfully depends on the degree of the imperfection of FM rapidly, but the QBER induced by Eve's attack changes with the degree of the imperfection of FM slightly.

  20. FUTURE POWER GRID INITIATIVE An Intelligent Agent Platform

    E-Print Network [OSTI]

    FUTURE POWER GRID INITIATIVE VOLTTRONTM : An Intelligent Agent Platform for the Smart Grid Two-way Power Flows n Decentralized Control To Support Micro-Grids And Islanding n Enable Load, not developed past simulation, and/or do not fit the requirements of the power grid. VOLTTRON has become

  1. Aalborg Universitet Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Aalborg Universitet Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed., & Guerrero, J. M. (2014). Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed.aau.dk on: juli 04, 2015 #12;Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed

  2. Aalborg Universitet Power flow analysis for DC voltage droop controlled DC microgrids

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Aalborg Universitet Power flow analysis for DC voltage droop controlled DC microgrids Li, Chendan). Power flow analysis for DC voltage droop controlled DC microgrids. In Proceedings of the 11th.aau.dk on: juli 07, 2015 #12;Power flow analysis for DC voltage droop controlled DC microgrids Chendan Li

  3. Power-Aware Scheduling for Makespan and Flow David P. Bunde

    E-Print Network [OSTI]

    Bunde, David

    Power-Aware Scheduling for Makespan and Flow David P. Bunde Department of Computer Science Knox different amounts of work. For total flow, we show that the optimal flow corresponding to a particular in computer systems. This is most obvious for battery-powered systems such as laptops because processor power

  4. 2892 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 29, NO. 6, NOVEMBER 2014 Optimal Power Flow in Direct Current Networks

    E-Print Network [OSTI]

    Wierman, Adam

    .g., photovoltaic panels, wind turbines, electric vehicles, electronic appliances, and fuel cells, are easier2892 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 29, NO. 6, NOVEMBER 2014 Optimal Power Flow in Direct Current Networks Lingwen Gan and Steven H. Low, Fellow, IEEE Abstract--The optimal power flow (OPF

  5. IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 15, NO. 2, MAY 2000 535 Stability-Constrained Optimal Power Flow

    E-Print Network [OSTI]

    IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 15, NO. 2, MAY 2000 535 Stability-Constrained Optimal Power Flow Deqiang Gan, Member, IEEE, Robert J. Thomas, Fellow, IEEE, and Ray D. Zimmerman, Member, IEEE

  6. Risk-Mitigated Optimal Power Flow for Wind Powered Grids Emma Sjodin, Dennice F. Gayme and Ufuk Topcu

    E-Print Network [OSTI]

    Wierman, Adam

    Risk-Mitigated Optimal Power Flow for Wind Powered Grids Emma Sj¨odin, Dennice F. Gayme and Ufuk." High grid penetrations of solar or wind power pose a number of operational challenges and it is widely is the use of large-scale grid-integrated energy storage. The role of energy storage in power systems has

  7. Application of Flow Battery in Marine Current Turbine System for Daily Power Management

    E-Print Network [OSTI]

    Brest, Université de

    Application of Flow Battery in Marine Current Turbine System for Daily Power Management Zhibin Zhou focuses on a grid-connected MCT system and proposes using vanadium redox flow battery (VRB) energy storage and to guarantee the expected power injection to the local grid. Keywords--Marine current turbine, flow battery

  8. Parallel Processing Implementation of the Unit Commitment Problem with Full AC Power Flow Constraints

    E-Print Network [OSTI]

    Parallel Processing Implementation of the Unit Commitment Problem with Full AC Power Flow power flow model, which per- mits addressing voltage limits, as well as more real- istic branch flow specific kbd is achieved. Lagrangian relaxation allows trading a direct solution approach exhibiting

  9. Maximizing the Performance of Wind Turbines with Nonlinear Aeroservoelastic Power Flow Control

    E-Print Network [OSTI]

    1 Maximizing the Performance of Wind Turbines with Nonlinear Aeroservoelastic Power Flow Control by a wind turbine by operating at the edge of dynamic stall. This paper applies a novel nonlinear power flow of the first torsional mode of a nominal 5 MW rated power wind turbine blade. This model is analyzed using

  10. Edinburgh Research Explorer Local solutions of the optimal power flow problem

    E-Print Network [OSTI]

    Millar, Andrew J.

    law (KVL), which describes the flow of power in transmission lines, and is a nonlinear function of bus is to find a steady state operating point that minimizes the cost of electric power generation whileEdinburgh Research Explorer Local solutions of the optimal power flow problem Citation

  11. Nonlinear Power Flow Control Design: Utilizing Exergy, Entropy, Static and Dynamic

    E-Print Network [OSTI]

    Nonlinear Power Flow Control Design: Utilizing Exergy, Entropy, Static and Dynamic Stability (future electric power grid control, wind turbine load alleviation control, and novel micro-grid control provide the theoretical foundations necessary to view control design as power flow control problem

  12. Optimal power flow in microgrids using event-triggered optimization Pu Wan and Michael D. Lemmon

    E-Print Network [OSTI]

    Lemmon, Michael

    Optimal power flow in microgrids using event-triggered optimization Pu Wan and Michael D. Lemmon Abstract-- Microgrids are power generation and distribution systems in which users and generators-triggered distributed optimization algorithm to solve the optimal power flow (OPF) problem in microgrids. Under event

  13. A MultiPhase Power Flow Model for Grid Analysis A. P. Sakis Meliopoulos

    E-Print Network [OSTI]

    A MultiPhase Power Flow Model for µµµµGrid Analysis A. P. Sakis Meliopoulos School of Electrical power system with distributed energy sources forming a microgrid (µGrid). The µGrid is a radial multiphase power flow analysis method that provides exact solution to the operation of the µGrid under steady

  14. The two-way relationship between ionospheric outflow and the ring current

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Welling, Daniel T.; Jordanova, Vania Koleva; Glocer, Alex; Toth, Gabor; Liemohn, Michael W.; Weimer, Dan R.

    2015-06-01

    It is now well established that the ionosphere, because it acts as a significant source of plasma, plays a critical role in ring current dynamics. However, because the ring current deposits energy into the ionosphere, the inverse may also be true: the ring current can play a critical role in the dynamics of ionospheric outflow. This study uses a set of coupled, first-principles-based numerical models to test the dependence of ionospheric outflow on ring current-driven region 2 field-aligned currents (FACs). A moderate magnetospheric storm event is modeled with the Space Weather Modeling Framework using a global MHD code (Block Adaptivemore »Tree Solar wind Roe-type Upwind Scheme, BATS-R-US), a polar wind model (Polar Wind Outflow Model), and a bounce-averaged kinetic ring current model (ring current atmosphere interaction model with self-consistent magnetic field, RAM-SCB). Initially, each code is two-way coupled to all others except for RAM-SCB, which receives inputs from the other models but is not allowed to feed back pressure into the MHD model. The simulation is repeated with pressure coupling activated, which drives strong pressure gradients and region 2 FACs in BATS-R-US. It is found that the region 2 FACs increase heavy ion outflow by up to 6 times over the non-coupled results. The additional outflow further energizes the ring current, establishing an ionosphere-magnetosphere mass feedback loop. This study further demonstrates that ionospheric outflow is not merely a plasma source for the magnetosphere but an integral part in the nonlinear ionosphere-magnetosphere-ring current system.« less

  15. Precision control of high temperature furnaces using an auxiliary power supply and charged practice current flow

    DOE Patents [OSTI]

    Pollock, George G. (San Ramon, CA)

    1997-01-01

    Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved.

  16. Precision control of high temperature furnaces using an auxiliary power supply and charged particle current flow

    DOE Patents [OSTI]

    Pollock, G.G.

    1997-01-28

    Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. 5 figs.

  17. Time series power flow analysis for distribution connected PV generation.

    SciTech Connect (OSTI)

    Broderick, Robert Joseph; Quiroz, Jimmy Edward; Ellis, Abraham; Reno, Matthew J.; Smith, Jeff; Dugan, Roger

    2013-01-01

    Distributed photovoltaic (PV) projects must go through an interconnection study process before connecting to the distribution grid. These studies are intended to identify the likely impacts and mitigation alternatives. In the majority of the cases, system impacts can be ruled out or mitigation can be identified without an involved study, through a screening process or a simple supplemental review study. For some proposed projects, expensive and time-consuming interconnection studies are required. The challenges to performing the studies are twofold. First, every study scenario is potentially unique, as the studies are often highly specific to the amount of PV generation capacity that varies greatly from feeder to feeder and is often unevenly distributed along the same feeder. This can cause location-specific impacts and mitigations. The second challenge is the inherent variability in PV power output which can interact with feeder operation in complex ways, by affecting the operation of voltage regulation and protection devices. The typical simulation tools and methods in use today for distribution system planning are often not adequate to accurately assess these potential impacts. This report demonstrates how quasi-static time series (QSTS) simulation and high time-resolution data can be used to assess the potential impacts in a more comprehensive manner. The QSTS simulations are applied to a set of sample feeders with high PV deployment to illustrate the usefulness of the approach. The report describes methods that can help determine how PV affects distribution system operations. The simulation results are focused on enhancing the understanding of the underlying technical issues. The examples also highlight the steps needed to perform QSTS simulation and describe the data needed to drive the simulations. The goal of this report is to make the methodology of time series power flow analysis readily accessible to utilities and others responsible for evaluating potential PV impacts.

  18. Modified two-way protocol for quantum secure direct communication with the presence of channel loss and noise

    E-Print Network [OSTI]

    Jianyong Hu; Bo Yu; Mingyong Jing; Liantuan Xiao; Suotang Jia

    2015-03-02

    Quantum secure direct communication can effectively save the computing resource and improve the communication rate. In this paper, we present a coding scheme based on the single-photons modulation which can perform the two-way protocol for quantum secure direct communication with the presence of channel loss and noise. To the modified two-way protocol, the information bits can only be extracted from a batch of qubits, therefore, the leakage of a few qubits would not cause the leakage of information bits. The security condition, the information bit rate and the security communication distance are discussed.

  19. Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids

    E-Print Network [OSTI]

    Yeoh, William

    Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids Paul Scott1 direction method of multipliers (ADMM), can be adapted to remain practical in this challenging microgrid discrete decisions. Our experiments on a suburb-sized microgrid show that the AC power flows and a simple

  20. Journal of Power Sources 128 (2004) 5460 Microfluidic fuel cell based on laminar flow

    E-Print Network [OSTI]

    Kenis, Paul J. A.

    2004-01-01

    Journal of Power Sources 128 (2004) 54­60 Microfluidic fuel cell based on laminar flow Eric R compartments. While these PEM-type fuel cell designs have great promise to become the power source of choice a novel microfluidic fuel cell concept that utilizes the occurrence of multi-stream laminar flow

  1. A Comparison of the AC and DC Power Flow Models for LMP Calculations

    E-Print Network [OSTI]

    power flow model for LMP-based market calculations. The paper first provides a general discussion values include generator AVR status, LTC and phase shifting transformer tap positions, discrete switched shifting transformers is often dependent upon the transformer's tap value. Last, the power flow models

  2. Memoryless Relay Strategies for Two-Way Relay Channels: Performance Analysis and Optimization

    E-Print Network [OSTI]

    Ho, Tracey

    Engineering New Mexico State University Las Cruces, NM 88003, USA Email: jkliewer@nmsu.edu Abstract-- We parameterized on the noise power and the transmission energy. The optimized function behaves like AAF in low SNR) has drawn renewed interest from both academic and industrial communities [2]­[6] due to its potential

  3. Robust Beamforming for OFDM Modulated Two-Way MIMO Relay Network 

    E-Print Network [OSTI]

    Zhou, Jianwei

    2012-07-16

    in this TWRN is amplify-and-forward (AF) based analog network coding (ANC). A robust beamforming matrix optimization algorithm is presented here with the objective to minimize the transmit power at the relay node under given signal to interference and noise...

  4. Optimal Power Flow Formulation in Market of Retail Wheeling Taiyou Yong, Student Member, IEEE Robert Lasseter, Fellow, IEEE

    E-Print Network [OSTI]

    Optimal Power Flow Formulation in Market of Retail Wheeling Taiyou Yong, Student Member, IEEE distribution in the new retail wheeling market. Formation of optimal power flow (OPF) problem, in which concerns on optimal power flow arise in the retail wheeling market. In the deregulated power system

  5. Two-Way Integration of WRF and CCSM for Regional Climate Simulations

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking With WIPP UPDATE: April 15, 2014Two

  6. Abstract--The optimal power flow (OPF) problem is a critical problem for power generation and is generally non-convex. This

    E-Print Network [OSTI]

    Lavaei, Javad

    1 Abstract-- The optimal power flow (OPF) problem is a critical problem for power generation flow on the line P: vector of active power generations Q: vector of reactive power generations L: loss/reactive power generation limits. Given the practical importance of the problem, a great many studies have been

  7. Two-Way Beacon Scheduling in ZigBee Tree-Based Wireless Sensor Networks , Meng-Shiuan Pan

    E-Print Network [OSTI]

    Tseng, Yu-Chee

    Two-Way Beacon Scheduling in ZigBee Tree-Based Wireless Sensor Networks Lun-Wu Yeh , Meng-way beacon scheduling prob- lem for ZigBee tree-based networks. We propose a schedul- ing algorithm that can sce- nario. The network contains one sink (ZigBee coordina- tor), some full-function devices (ZigBee

  8. The 2010 International Computer Symposium Aggregate Two-way Co-Clustering of Ads and User Analysis for Online

    E-Print Network [OSTI]

    Chang, Chia-Hui

    The 2010 International Computer Symposium Aggregate Two-way Co-Clustering of Ads and User Analysis ads and users need to be clustered. The key data that connect ads and users are contained in the user-ad link matrix, which denotes the ads that a user has linked. We proposed a three-staged clustering

  9. A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman

    E-Print Network [OSTI]

    A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman Indoor Environment Program ABSTRACT This report develops a theoretical description of the hydrodynamic relationship based on a power pipes can be described with a simple power law dependence on pressure, but that the exponent

  10. Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units with

    E-Print Network [OSTI]

    Chaudhary, Sanjay

    Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units power system. Being able to operate in both grid-connected and islanded mode, a microgrid manages and controls distributed energy resources, energy storage systems and loads, most of them are power electronic

  11. A Novel Power Flow Method for Long Term Frequency Stability Analysis 

    E-Print Network [OSTI]

    Yan, Wenjin

    2013-05-06

    This thesis presents a novel approach for a power system to find a practical power flow solution when all the generators in the system have hit their real power output limits, such as some generator units shutting down or load outages. The approach...

  12. POWER FLOW ANALYSIS OF ELECTROSTRICTIVE ACTUATORS DRIVEN BYSWITCHMODE AMPLIFIERS

    E-Print Network [OSTI]

    Lindner, Douglas K.

    of that energy. We adopt this view in this paper. The analysis in this paper is motivated by the smart skin being Consider the flow of energy through this smart skin. Electrical energy is supplied to the smart skin from energy into mechanical energy. This mechanical energy then flows from the smart skin into the surrounding

  13. DC Optimal Power Flow Formulation in AMES Leigh Tesfatsion

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    wholesale power market testbed. I. AMES TESTBED The latest version of AMES (Agent-based Modeling is measured by the net earnings it secures for itself through the purchase of power in the day- ahead market and the resale of this power to its retail cus- tomers. During the morning of each day D, each LSE j reports

  14. Free Flow Power Partners to Improve Hydrokinetic Turbine Performance...

    Energy Savers [EERE]

    as the device performed as expected, with no discernible harm to river-dwelling fish. Free Flow has also completed preliminary designs of utility-scale installations at a...

  15. A three phase load flow algorithm for Shipboard Power Systems 

    E-Print Network [OSTI]

    Medina-Calder?on, M?onica M

    2003-01-01

    -Seidel and/or Newton Raphson techniques, were primarily developed for transmission system analysis. Distribution load flow analysis must incorporate its unique characteristics such as unbalanced loads, distributed loads, radial network structure, and one...

  16. Analysis of operating data related to power and flow distribution in a PWR

    E-Print Network [OSTI]

    Herbin, Henry Christophe

    1974-01-01

    The analysis of the effects of the uncertainties associated with temperature and power measurements in the Connecticut Yankee Reactor leads to the evaluation of the uncertainty associated with the effective flow factor. ...

  17. Assessment of microwave power flow for reflectometry measurements in tokamak plasmas

    E-Print Network [OSTI]

    Gourdain, P-A; Peebles, W. A.

    2008-01-01

    of incident and reflected microwave rays for O-mode and X-Assessment of microwave power flow for reflectometryLos Angeles, CA 90095-1547 Microwave diagnostics, such as

  18. Optimal Power Flow: Closing the Loop over Corrupted Data

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    application are the Supervisory Control and Data Acquisition (SCADA) systems. In power networks, the SCADA System. Modern SCADA/EMS systems collect large amounts of measurement data and, using a State Estimator attack. We denote the data corruption by a. cyber attacks on SCADA/EMS systems operating power net- works

  19. Voltage multi-stability in distribution grids with power flow reversal

    E-Print Network [OSTI]

    Hung D. Nguyen; Konstantin Turitsyn

    2014-07-08

    High levels of penetration of distributed generation and aggressive reactive power compensation with modern power electronics may result in the reversal of active and reactive power flows in future distribution grids. The voltage stability of these operating conditions may be very different from the more traditional power consumption regime. We study the stability characteristics of distribution networks with reversed power flow. After introducing a universal algebraic approach to characterize all the solutions of the power flow equations, we show that new solutions appear in the reversed power flow regime even in the simplest three bus systems. We show that the some of these solutions are stable and the system may exhibit a phenomenon of multistability, where multiple stable equilibria co-exist at the given set of parameters, and the system may converge to an undesirable equilibrium after a disturbance. These predictions are validated with dynamic simulations of two different systems. Under certain conditions the new states are viable and may be characterized by relatively high voltages. Possible approaches towards reactive power/voltage regulation as well as permissible distributed generation capacity in future power systems are proposed and discussed in the end of the paper.

  20. Two-way Vision

    E-Print Network [OSTI]

    Ware, Gilbert

    1981-01-01

    condition that stimulated Albert Camus' plea. Camus says, "[hope, unadulterated-plea from Albert Camus. Judge William H.

  1. A COMPUTATIONAL ANALYSIS OF THE OPTIMAL POWER FLOW PROBLEM

    E-Print Network [OSTI]

    under these contingencies was exemplified by the blackout in the North American power grid during 2003. The reason for the blackout was a failure of only a handful of contingencies in the network [8

  2. Flow Shop Scheduling with Peak Power Consumption Constraints

    E-Print Network [OSTI]

    2012-09-23

    voltages to produce a preemptive task schedule that minimizes total energy ... since it affects the power supply and cooling technologies in the design of ...... The primary role of the two heuristic algorithms described above in our study is to

  3. Islanding model for preventing wide-area blackouts and the issue of local solutions of the optimal power flow problem. 

    E-Print Network [OSTI]

    Bukhsh, Waqquas Ahmed

    2014-07-01

    Optimization plays a central role in the control and operation of electricity power networks. In this thesis we focus on two very important optimization problems in power systems. The first is the optimal power flow ...

  4. Interline Photovoltaic (I-PV) power system - A novel concept of power flow control and management

    E-Print Network [OSTI]

    Khadkikar, Vinod

    This paper presents a new system configuration for a large-scale Photovoltaic (PV) power system with multi-line transmission/distribution networks. A PV power plant is reconfigured in a way that two adjacent power system ...

  5. 1464 IEEE TRANSACTIONS ON SMART GRID, VOL. 4, NO. 3, SEPTEMBER 2013 Distributed Optimal Power Flow

    E-Print Network [OSTI]

    Giannakis, Georgios

    --Distributed optimization, distribution feeders, microgrids, optimal power flow, semidefinite relaxation. I. INTRODUCTION MICROGRIDS are portions of a power distribution net- work located downstream of the distribution substation) and energy storage devices [1]. A microgrid can operate in either grid-connected, islanded, or hybrid modes

  6. Aalborg Universitet Power flow analysis for droop controlled LV hybrid AC-DC microgrids with virtual

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Aalborg Universitet Power flow analysis for droop controlled LV hybrid AC-DC microgrids controlled LV hybrid AC-DC microgrids with virtual impedance. In Proceedings of the IEEE Power & Energy Interlinking converter PV WT IBS DC microgrid DC microgrid AC microgrid AC Load Figure 1. Structure

  7. High Average Power Laser Gain Medium With Low Optical Distortion Using A Transverse Flowing Liquid Host

    DOE Patents [OSTI]

    Comaskey, Brian J. (Walnut Creek, CA); Ault, Earl R. (Livermore, CA); Kuklo, Thomas C. (Oakdale, CA)

    2005-07-05

    A high average power, low optical distortion laser gain media is based on a flowing liquid media. A diode laser pumping device with tailored irradiance excites the laser active atom, ion or molecule within the liquid media. A laser active component of the liquid media exhibits energy storage times longer than or comparable to the thermal optical response time of the liquid. A circulation system that provides a closed loop for mixing and circulating the lasing liquid into and out of the optical cavity includes a pump, a diffuser, and a heat exchanger. A liquid flow gain cell includes flow straighteners and flow channel compression.

  8. Power flow tracing in a simplified highly renewable European electricity network

    E-Print Network [OSTI]

    Tranberg, Bo; Rodriguez, Rolando A; Andresen, Gorm B; Schäfer, Mirko; Greiner, Martin

    2015-01-01

    The increasing transmission capacity needs in a future energy system raise the question how associated costs should be allocated to the users of a strengthened power grid. In contrast to straightforward oversimplified methods, a flow tracing based approach provides a fair and consistent nodal usage and thus cost assignment of transmission investments. This technique follows the power flow through the network and assigns the link capacity usage to the respective sources or sinks using a diffusion-like process, thus taking into account the underlying network structure and injection pattern. As a showcase, we apply power flow tracing to a simplified model of the European electricity grid with a high share of renewable wind and solar power generation, based on long-term weather and load data with an hourly temporal resolution.

  9. Role of B19' martensite deformation in stabilizing two-way shape memory behavior in NiTi

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Benafan, O.; Padula, S. A.; Noebe, R. D.; Sisneros, T. A.; Vaidyanathan, R.

    2012-11-01

    Deformation of a B19' martensitic, polycrystallineNi49.9Ti50.1 (at. %) shape memoryalloy and its influence on the magnitude and stability of the ensuing two-way shape memory effect (TWSME) was investigated by combined ex situ mechanical experimentation and in situneutron diffraction measurements at stress and temperature. The microstructural changes (texture, lattice strains, and phase fractions) during room-temperature deformation and subsequent thermal cycling were captured and compared to the bulk macroscopic response of the alloy. With increasing uniaxial strain, it was observed that B19' martensite deformed by reorientation and detwinning with preferred selection of the (1Ż50)M and (010)M variants, (201Ż)B19' deformation twinning, and dislocationmore »activity. These mechanisms were indicated by changes in bulk texture from the neutron diffraction measurements. Partial reversibility of the reoriented variants and deformation twins was also captured upon load removal and thermal cycling, which after isothermal deformation to strains between 6% and 22% resulted in a strong TWSME. Consequently, TWSME functional parameters including TWSME strain, strain reduction, and transformation temperatures were characterized and it was found that prior martensite deformation to 14% strain provided the optimum condition for the TWSME, resulting in a stable two-way shape memory strain of 2.2%. Thus, isothermal deformation of martensite was found to be a quick and efficient method for creating a strong and stable TWSME in Ni??.?Ti??.?.« less

  10. Smart Grid The New and Improved Power Grid: A Survey Xi Fang, Student Member, IEEE, Satyajayant Misra, Member, IEEE, Guoliang Xue, Fellow, IEEE,

    E-Print Network [OSTI]

    Misra, Satyajayant

    Smart Grid ­ The New and Improved Power Grid: A Survey Xi Fang, Student Member, IEEE, Satyajayant--The Smart Grid, regarded as the next generation power grid, uses two-way flows of electricity the literature till 2011 on the enabling technologies for the Smart Grid. We explore three major systems, namely

  11. Local Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul Trodden

    E-Print Network [OSTI]

    Grothey, Andreas

    is primarily due to Kirchhoff's voltage law (KVL), which describes the flow of power in transmission lines that minimizes the cost of electric power generation while satisfying operating constraints and meeting demandLocal Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul

  12. The Flow of Power-Law Fluids in Axisymmetric Corrugated Tubes

    E-Print Network [OSTI]

    Sochi, Taha

    2010-01-01

    In this article we present an analytical method for deriving the relationship between the pressure drop and flow rate in laminar flow regimes, and apply it to the flow of power-law fluids through axially-symmetric corrugated tubes. The method, which is general with regards to fluid and tube shape within certain restrictions, can also be used as a foundation for numerical integration where analytical expressions are hard to obtain due to mathematical or practical complexities. Five converging-diverging geometries are used as examples to illustrate the application of this method.

  13. The Flow of Power-Law Fluids in Axisymmetric Corrugated Tubes

    E-Print Network [OSTI]

    Taha Sochi

    2010-06-13

    In this article we present an analytical method for deriving the relationship between the pressure drop and flow rate in laminar flow regimes, and apply it to the flow of power-law fluids through axially-symmetric corrugated tubes. The method, which is general with regards to fluid and tube shape within certain restrictions, can also be used as a foundation for numerical integration where analytical expressions are hard to obtain due to mathematical or practical complexities. Five converging-diverging geometries are used as examples to illustrate the application of this method.

  14. Power Flow Management in a High Penetration Wind-Diesel Hybrid Power System with Short-Term Energy Storage

    SciTech Connect (OSTI)

    Drouilhet, S. M.

    1999-07-29

    This paper is intended as an introduction to some of the control challenges faced by developers of high penetration wind-diesel systems, with a focus on the management of power flows in order to achieve precise regulation of frequency and voltage in the face of rapidly varying wind power input and load conditions. The control algorithms presented herein are being implemented in the National Renewable Energy Laboratory (NREL) high penetration wind-diesel system controller that will be installed in the village of Wales, Alaska, in early 2000.

  15. Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids

    E-Print Network [OSTI]

    Trumpf, Jochen

    Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids Paul Scott Methodologies]: Artificial Intelligence Keywords OPF; ADMM; demand response; distributed control; micro- grid-coupled behaviours. In this new regime demand response (DR) techniques will play a central role in providing

  16. Animation and Visualization of Spot Prices via Quadratized Power Flow Analysis

    E-Print Network [OSTI]

    Animation and Visualization of Spot Prices via Quadratized Power Flow Analysis A. P. Sakis@attbi.com Abstract This paper presents a new model for efficient calculation of spot prices and animation and visualization of spot price evolution as the system operating point is changing. The computational method

  17. Primary pump power as a measure of fluid density during bubbly two-phase flow. [PWR

    SciTech Connect (OSTI)

    McCreery, G.E.; Linebarger, J.H.; Koske, J.E.

    1983-01-01

    A nuclear plant operator requires other information on reactor coolant system inventory besides just pressurizer liquid level, which often disappears or gives ambiguous indications during a loss-of-coolant accident. Erroneous instrument readings during the Three Mile Island and Ginna accidents are examples. Pump power or current is shown in this paper to provide an additional source of inventory information. When the reactor coolant pumps are operating, it allows the operator to make decisions about the advisability of continued pump- and safety-injection operation. The inventory information is provided by a simple method of calculating fluid density for bubbly two-phase flow by relating pump power or current to fluid density. The calculational method is derived and compared with data in this paper. Calculations using the method agree well with the measured experimental data with increasing void fraction, until the flow transitions from bubbly to partially stratified churn flow within the pump.

  18. HHFW Power Flow Along Magnetic Field Lines In The Scrape-off Layer of NSTX

    SciTech Connect (OSTI)

    Rory Perkins, et. al.

    2012-02-27

    A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast wave heating and current drive.

  19. Chance Constrained Optimal Power Flow: Risk-Aware Network Control under Uncertainty

    E-Print Network [OSTI]

    Bienstock, Daniel; Harnett, Sean

    2012-01-01

    When uncontrollable resources fluctuate, Optimum Power Flow (OPF), routinely used by the electric power industry to re-dispatch hourly controllable generation (coal, gas and hydro plants) over control areas of transmission networks, can result in grid instability, and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation under OPF with renewable variability can lead to frequent conditions where power line flow ratings are significantly exceeded. Such a condition, which is borne by simulations of real grids, would likely resulting in automatic line tripping to protect lines from thermal stress, a risky and undesirable outcome which compromises stability. Smart grid goals include a commitment to large penetration of highly fluctuating renewables, thus calling to reconsider current practices, in particular the use of standard OPF. Our Chance Constrained (CC) OPF correct...

  20. Outage Detection in Power Distribution Networks with Optimally-Deployed Power Flow Sensors

    E-Print Network [OSTI]

    Zhao, Yue

    distribution networks. As society becomes more dependent on electric power, the economic and societal costs due sensor at the substation [2]. In networks This research was supported in part by the DTRA under Grant a single digital transient recording device at the substation, fault location and diagnosis systems have

  1. Flow simulation of the Component Development Integration Facility magnetohydrodynamic power train system

    SciTech Connect (OSTI)

    Chang, S.L.; Lottes, S.A.; Bouillard, J.X.; Petrick, M.

    1997-11-01

    This report covers application of Argonne National Laboratory`s (ANL`s) computer codes to simulation and analysis of components of the magnetohydrodynamic (MHD) power train system at the Component Development and Integration Facility (CDIF). Major components of the system include a 50-MWt coal-fired, two-stage combustor and an MHD channel. The combustor, designed and built by TRW, includes a deswirl section between the first and the second-stage combustor and a converging nozzle following the second-stage combustor, which connects to the MHD channel. ANL used computer codes to simulate and analyze flow characteristics in various components of the MHD system. The first-stage swirl combustor was deemed a mature technology and, therefore, was not included in the computer simulation. Several versions of the ICOMFLO computer code were used for the deswirl section and second-stage combustor. The MGMHD code, upgraded with a slag current leakage submodel, was used for the MHD channel. Whenever possible data from the test facilities were used to aid in calibrating parameters in the computer code, to validate the computer code, or to set base-case operating conditions for computations with the computer code. Extensive sensitivity and parametric studies were done on cold-flow mixing in the second-stage combustor, reacting flow in the second-stage combustor and converging nozzle, and particle-laden flow in the deswirl zone of the first-stage combustor, the second-stage combustor, and the converging nozzle. These simulations with subsequent analysis were able to show clearly in flow patterns and various computable measures of performance a number of sensitive and problematical areas in the design of the power train. The simulations of upstream components also provided inlet parameter profiles for simulation of the MHD power generating channel. 86 figs., 18 tabs.

  2. Engineering Predictions in Industrial and Power Flows Using the Retrograde Condensation Curve. Part I-Methodology

    E-Print Network [OSTI]

    Labinov, Mark S

    2014-01-01

    Industrial and power systems rely on engineering predictions of the flow properties of working fluids. The paper proposes a way of the utilization of the vapor quality values along the new retrograde condensation curve in the generation of the void fraction design guidelines and reliable prediction of the saturated liquid specific volumes/densities. The new procedure eliminates the involvement of semi-empirical relationships like rectilinear diameter and other similar models.

  3. Numerical Simulation of the Flow of a Power Law Fluid in an Elbow Bend 

    E-Print Network [OSTI]

    Kanakamedala, Karthik

    2010-07-14

    equations are given by, ????? = ????? + ?? + ??? where, ? is the Laplacian operator ? is the density of the body ? is the body force ? is the velocity vector However, the fluid being dealt within the problem is a non-Newtonian power law fluid... parameters. This problem finds applications mainly in the food and polymer industries where non-Newtonian fluids flow through different piping sections. The elbow geometry used for performing the simulations consists of a straight portion of ??? both after...

  4. Transverse flowing liquid Kerr cell for high average power laser Q-switching and for direct modulation of high power laser beams.

    DOE Patents [OSTI]

    Comaskey, Brian J.

    2004-12-07

    A fluid flow concept is applied in an optical apparatus to define a high gain stand-off, fast electro-optical q-switch which is highly impervious to high average power optical loads.

  5. Study of multi-phase flow characteristics in an MHD power train

    SciTech Connect (OSTI)

    Chang, S.L.; Lottes, S.A.; Bouillard, J.X.; Petrick, M.

    1993-08-01

    Computer simulation was used to predict two-phase flow processes in the CDIF MHD power train system. The predictions were used to evaluate the effects of operating and design parameters on the performance of the system and a parametric evaluation provides information to enhance the performance of the system. Major components of the system under investigation are the two-stage combustor, the converging/diverging nozzle, the supersonic MHD channel, and the diffuser. Flow in each component was simulated using a computer code. Integrating the computer codes, the two-phase flow processes in the system was calculated. Recently, the computer codes were used to investigate problems of nozzle erosion and the non-uniform iron oxide coverage on the cathode wall in the channel. A limited parametric study was conducted. The results indicated that (1) among the three nozzle geometries under investigation a {number_sign}5 nozzle has the smoothest flow development in the nozzle and has the lowest droplet deposition on wall and (2) smaller particle size and lower injection velocity tend to disperse the iron oxide particles more uniformly in the nozzle.

  6. The flow of power law fluids in elastic networks and porous media

    E-Print Network [OSTI]

    Sochi, Taha

    2015-01-01

    The flow of power law fluids, which include shear thinning and shear thickening as well as Newtonian as a special case, in networks of interconnected elastic tubes is investigated using a residual based pore scale network modeling method with the employment of newly derived formulae. Two relations describing the mechanical interaction between the local pressure and local cross sectional area in distensible tubes of elastic nature are considered in the derivation of these formulae. The model can be used to describe shear dependent flows of mainly viscous nature. The behavior of the proposed model is vindicated by several tests in a number of special and limiting cases where the results can be verified quantitatively or qualitatively. The model, which is the first of its kind, incorporates more than one major non-linearity corresponding to the fluid rheology and conduit mechanical properties, that is non-Newtonian effects and tube distensibility. The formulation, implementation and performance indicate that the...

  7. Data gathering to build and validate small-scale social models for simulation. Two ways: strict control and stake-holders involvement

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    Data gathering to build and validate small-scale social models for simulation. Two ways: strict. Nowadays, it has become a norm to assess results with actually comparable data and to build the hypothesis for the right use of empirical data in the building of models (Moss and Edmonds, 2005). In this paper, we focus

  8. 4100 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 10, NO. 12, DECEMBER 2011 Cost-Delay Tradeoffs for Two-Way Relay Networks

    E-Print Network [OSTI]

    Yener, Aylin

    algorithms perform remarkably well. Index Terms--Cost sharing, delay, network coding, two-way relaying, queue4100 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 10, NO. 12, DECEMBER 2011 Cost relay use incurs some cost, which, for example, could be transmission energy. This cost is shared

  9. Voltage Collapse and ODE Approach to Power Flows: Analysis of a Feeder Line with Static Disorder in Consumption/Production

    E-Print Network [OSTI]

    Chertkov, M; Turtisyn, K; Chernyak, V; Lebedev, V

    2011-01-01

    We consider a model of a distribution feeder connecting multiple loads to the sub-station. Voltage is controlled directly at the head of the line (sub-station), however, voltage anywhere further down the line is subject to fluctuations, caused by irregularities of real and reactive distributed power consumption/generation. The lack of a direct control of voltage along the line may result in the voltage instability, also called voltage collapse - phenomenon well known and documented in the power engineering literature. Motivated by emerging photo-voltaic technology, which brings a new source of renewable generation but also contributes significant increase in power flow fluctuations, we reexamine the phenomenon of voltage stability and collapse. In the limit where the number of consumers is large and spatial variations in power flows are smooth functions of position along the feeder, we derive a set of the power flow Ordinary Differential Equations (ODE), verify phenomenon of voltage collapse, and study the ef...

  10. AVTA: Vehicle to Grid Power Flow Regulations and Building Codes Review

    Broader source: Energy.gov [DOE]

    The Vehicle Technologies Office's Advanced Vehicle Testing Activity carries out testing on a wide range of advanced vehicles and technologies on dynamometers, closed test tracks, and on-the-road. These results provide benchmark data that researchers can use to develop technology models and guide future research and development. The following report is a review of Vehicle-to-Grid power flow regulations and building codes, as informed by the AVTA's testing on plug-in electric vehicle charging equipment. This research was conducted by Idaho National Laboratory.

  11. Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron

    SciTech Connect (OSTI)

    Yamaguchi, Yuusuke; Tatematsu, Yoshinori; Saito, Teruo; Ikeda, Ryosuke; Mudiganti, Jagadish C.; Ogawa, Isamu; Idehara, Toshitaka [Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui-shi 910-8507 (Japan)

    2012-11-15

    This paper describes the design of a triode magnetron injection gun for use in a 200 kW, 300 GHz gyrotron. As power and frequency increase, the performance of the gyrotron becomes quite sensitive to the quality of the electron beam. Formation of a laminar electron flow is essential for the realization of a high quality beam with a small velocity spread. In this study, a new method is developed for a quantitative evaluation of the laminarity and is applied to optimize the electrode design. The laminarity depends not only on conventional design parameters such as the cathode slant angle but also on the spatial distribution of the electric field along the beam trajectory. In the optimized design, the velocity pitch factors, {alpha}, larger than 1.2 are obtained at 65 kV, 10 A with spreads, {Delta}{alpha}, less than 5%.

  12. 1462 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 26, NO. 3, AUGUST 2011 A Self-Organizing Strategy for Power Flow Control

    E-Print Network [OSTI]

    Qu, Zhihua

    for Power Flow Control of Photovoltaic Generators in a Distribution Network Huanhai Xin, Zhihua Qu, Fellow 310027, China. He was also with the University of Central Florida, Orlando, FL 32815 USA, when he and Computer Sci- ence, University of Central Florida, Orlando, FL 32815 USA (e-mail: qu@eecs. ucf.edu). J

  13. Simulation of three-dimensional multi-phase flow characteristics in the deswirl section of the CDIF MHD power train

    SciTech Connect (OSTI)

    Chang, S.L.; Lottes, S.A.; Petrick, M.

    1994-06-01

    A three-dimensional, two-phase, turbulent flow computer code was used to predict flow characteristics of seed particles and coal gas in the deswirl section of the CDIF MHD power train system. Seed material which has a great effect on the overall performance of the MHD system is injected in the deswirl against the swirling coal gas flow coming from the first stage combustor. While testing the MHD system, excessive seed material (70% more than theoretical value) was required to achieve design operating conditions. Calculations show that the swirling coal gas flow turns a 90 degree angle to minimize the swirl motion before entering a second stage combustor and many seed particles are too slow to react to the flow turning and deposit on the walls of the deswirl section. Some seed material deposited on the walls is covered by slag layer and removed from the gas flow. The reduction of seed material in the gas flow decreases MHD power generation significantly. A computational experiment was conducted and its results show that seed injection on the wall can be minimized by simply changing the seed injection and an optimum location was identified. If seed is injected from the location of choice, the seed deposition is reduced by a factor of 10 compared to the original case.

  14. Influence of fluid density on the statistics of power fluctuations in von K\\'arm\\'an swirling flows

    E-Print Network [OSTI]

    Opazo, A; Bustamante, G; Labbé, R

    2015-01-01

    We report experimental results for fluctuations of injected power in confined von K\\'arm\\'an swirling flows with constant external torque applied to the stirrers. Two experiments were performed at nearly equal Reynolds numbers in geometrically similar experimental setups, using air in one of them and water in the other. We found that the probability density function of power fluctuations is strongly asymmetric in air, while in water it is closer to a Gaussian, showing that the effect that a big change on the fluid density has on the flow-stirrer interaction is not reflected merely by a change in the amplitude of stirrers' response. In the case of water, with a density roughly 830 times greater than air density, the forcing exerted by the flow on the stirrers is stronger, so that they follow more closely the locally averaged rotation of the flow. When the fluid is air, the forcing is much weaker, resulting not only in a smaller stirrer response to the torque exerted by the flow, but also in power fluctuations ...

  15. emission in galaxies at z1-2: Evidence for cold flow accretion powered star formation in the

    E-Print Network [OSTI]

    Spoon, Henrik

    PDRs, extending to kpc scales. We suggest that the star formation mode in these systems follows to the observed [CII] line. Subject headings: galaxies: evolution, star formation, PDRs, PAHs, shocks #12;­ 3 ­ 1Strong C+ emission in galaxies at z1-2: Evidence for cold flow accretion powered star formation

  16. Journal of Power Sources xxx (2006) xxxxxx The impact of channel path length on PEMFC flow-field design

    E-Print Network [OSTI]

    Van Zee, John W.

    2006-01-01

    Journal of Power Sources xxx (2006) xxx­xxx The impact of channel path length on PEMFC flow Distributions in reactant species concentration in a PEMFC due to local consumption of fuel and local transport in three dimensions in a PEMFC. These distributions can lead to flooding or drying of the membrane that may

  17. Biogeography-Based Optimization and the Solution of the Power Flow Problem

    E-Print Network [OSTI]

    Simon, Dan

    engineer Jules Carpentier [7]. A power utility may own power generating plants fueled by coal, natural gas

  18. Interactions between turbulent open channel flow, power and the wake of an axial-flow marine turbine

    E-Print Network [OSTI]

    Siefert, Chris

    turbine Leonardo P. Chamorro1 , Craig Hill1 , Vincent Neary2 , Budi Gunawan2 , Roger Arndt1 , Fotis-flow marine hydrokinetic turbines was lacking. Advancing this area of knowledge within the field of marine and hydrokinetic energy research, development, and deployment will lead to more efficient turbine operations

  19. High-Harmonic Fast-Wave Power Flow Along Magnetic Field Lines in the Scrape-Off Layer of NSTX

    SciTech Connect (OSTI)

    Perkins, R. J. [Princeton Plasma Physics Laboratory (PPPL); Hosea, J. [Princeton Plasma Physics Laboratory (PPPL); Kramer, G. [Princeton Plasma Physics Laboratory (PPPL); Ahn, Joonwook [ORNL; Bell, R. E. [Princeton Plasma Physics Laboratory (PPPL); Diallo, A. [Princeton Plasma Physics Laboratory (PPPL); Gerhardt, S. [Princeton Plasma Physics Laboratory (PPPL); Gray, T. K. [Oak Ridge National Laboratory (ORNL); Green, David L [ORNL; Jaeger, Erwin Frederick [ORNL; Jaworski, M. A. [Princeton Plasma Physics Laboratory (PPPL); LeBlanc, B [Princeton Plasma Physics Laboratory (PPPL); McLean, Adam G [ORNL; Maingi, Rajesh [ORNL; Phillips, C. K. [Princeton Plasma Physics Laboratory (PPPL); Roquemore, L. [Princeton Plasma Physics Laboratory (PPPL); Ryan, Philip Michael [ORNL; Sabbagh, S. A. [Columbia University; Taylor, G. [Princeton Plasma Physics Laboratory (PPPL); Wilson, J. R. [Princeton Plasma Physics Laboratory (PPPL)

    2012-01-01

    A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast-wave heating and current drive.

  20. Suction-recirculation device for stabilizing particle flows within a solar powered solid particle receiver

    DOE Patents [OSTI]

    Kolb, Gregory J. (Albuquerque, NM)

    2012-02-07

    A suction-recirculation device for stabilizing the flow of a curtain of blackened heat absorption particles falling inside of a solar receiver with an open aperture. The curtain of particles absorbs the concentrated heat from a solar mirror array reflected up to the receiver on a solar power tower. External winds entering the receiver at an oblique angle can destabilize the particle curtain and eject particles. A fan and ductwork is located behind the back wall of the receiver and sucks air out through an array of small holes in the back wall. Any entrained particles are separated out by a conventional cyclone device. Then, the air is recirculated back to the top of the receiver by injecting the recycled air through an array of small holes in the receiver's ceiling and upper aperture front wall. Since internal air is recirculated, heat losses are minimized and high receiver efficiency is maintained. Suction-recirculation velocities in the range of 1-5 m/s are sufficient to stabilize the particle curtain against external wind speeds in excess of 10 m/s.

  1. Power plant degradation : a modular secondary plant and integral flow accelerated corrosion model

    E-Print Network [OSTI]

    Van der Helm, Mark Johan, 1972-

    2001-01-01

    Flow Accelerated Corrosion (FAC) is the most prevalent material degradation mechanism for low carbon steel in steam-water flow systems. The band of uncertainty in predictions of wear rate due to FAC spans one to two orders ...

  2. Thin power law film flow down an inclined plane: consistent shallow water models and stability under large scale perturbations

    E-Print Network [OSTI]

    Noble, Pascal

    2012-01-01

    In this paper we derive consistent shallow water equations for thin films of power law fluids down an incline. These models account for the streamwise diffusion of momentum which is important to describe accurately the full dynamic of the thin film flows when instabilities like roll-waves arise. These models are validated through a comparison with Orr Sommerfeld equations for large scale perturbations. We only consider laminar flow for which the boundary layer issued from the interaction of the flow with the bottom surface has an influence all over the transverse direction to the flow. In this case the concept itself of thin film and its relation with long wave asymptotic leads naturally to flow conditions around a uniform free surface Poiseuille flow. The apparent viscosity diverges at the free surface which, in turn, introduces a singularity in the formulation of the Orr-Sommerfeld equations and in the derivation of shallow water models. We remove this singularity by introducing a weaker formulation of Cauc...

  3. Slide 1

    Broader source: Energy.gov (indexed) [DOE]

    in two-way power flow. Two-Way Power Flow *Central versus distributed control and automation. Evolving Control System Goal: Measure, Analyze, Predict, Control 3 *...

  4. Nanorod Niobium Oxide as Powerful Catalysts for an All Vanadium Redox Flow Battery

    SciTech Connect (OSTI)

    Li, Bin; Gu, Meng; Nie, Zimin; Wei, Xiaoliang; Wang, Chong M.; Sprenkle, Vincent L.; Wang, Wei

    2014-01-01

    Graphite felts (GFs), as typical electrode materials for all vanadium redox flow batteries (VRBs), limit the cell operation to low current density because of their poor kinetic reversibility and electrochemical activity. Here, in order to address this issue we report an electrocatalyst, Nb2O5, decorating the surface of GFs to reduce the activation barrier for redox conversion. Nb2O5 nanofibers with monoclinic phases are synthesized by hydrothermal method and deposited on GFs, which is confirmed to have catalytic effects towards redox couples of V(II)/V(III) at the negative side and V(IV)/V(V) at the positive side, and thus applied in both electrodes of VRB cells. Due to the low conductivity of Nb2O5, the performance of electrodes heavily depends on the nano size and uniform distribution of catalysts on GFs surfaces. The addition of the water-soluble compounds containing W element into the precursor solutions facilitates the precipitation of nanofibers on the GFs. Accordingly, an optimal amount of W-doped Nb2O5 nanofibers with weaker agglomeration and better distribution on GFs surfaces are obtained, leading to significant improvement of the electrochemical performances of VRB cells particularly under the high power operation. The corresponding energy efficiency is enhanced by 10.7 % under the operation of high charge/discharge current density (150 mA•cm-2) owing to faster charge transfer as compared with that without catalysts. These results suggest that Nb2O5 based nanofibers-decorating GFs hold great promise as high-performance electrodes for VRB applications.

  5. Power dissipation and time-averaged pressure in oscillating flow through a sudden area change

    E-Print Network [OSTI]

    Smith, Barton L.

    that abrupt changes in geometry are ubiquitous in Stirling engines, thermoacoustics, and res- piratory flows Barton L. Smith Mechanical and Aerospace Engineering Department, Utah State University, Logan, Utah 84322-averaged pressure gradient has been used to counteract streaming flows in a thermoacoustic Stirling refrigerator1

  6. Study of Power Converter Topologies with Energy Recovery and grid power flow control Part B: boost converter with energy storage

    E-Print Network [OSTI]

    Rogelio, Garcia Retegui; Gustavo, Uicich; Mario, Benedetti; Gilles, Le Godec; Konstantinos, Papastergiou

    2015-01-01

    In the framework of a Transfer line (TT2) Consolidation Programme, a number of studies on Energy cycling have been commissioned. Part of this work involves the study of dierent power electronic system topologies for magnet energy recovery. In this report, the use of a boost front-end converter supplying DC link of a 4-quadrant magnet supply is analysed. The key objective of the study is to find control strategies that result in the control of the peak power required from the power network as well as to recover the magnet energy into capacitor banks with controlled voltage fluctuation. The study comprises the modelling of the system by means of the method of state averaging and the development of regulation strategies to energy management. The proposed control strategies can be divided in two groups: in the first group, the magnet current is used to define the reference for the control system, while in the second group this current is unknown and some strategies are devised to limit the power drawn from the el...

  7. Optimal power flow application issues in the Pool paradigm George Grossa,*, Ettore Bompardb

    E-Print Network [OSTI]

    Gross, George

    a Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Power ramifications. These factors have wide ranging economic impacts, whose implications are very pronounced due consideration of some system performance measures into the steady state analysis of the power system. The basic

  8. The effect of expansion-ratio limitations on positive-displacement, total-flow geothermal power systems

    SciTech Connect (OSTI)

    DiPippo, R.

    1982-02-01

    Combined steam-turbine/positive-displacement engine (PDE) geothermal power systems are analyzed thermodynamically and compared with optimized reference flash-steam plants. Three different configurations of combined systems are considered. Treated separately are the cases of self-flowing and pumped wells. Two strategies are investigated that help overcome the inherent expansion-ratio limitation of PDE's: pre-flashing and pre-mixing. Parametrically-obtained results show the required minimum PDE efficiency for the combined system to match the reference plant for various sets of design conditions.

  9. Suction recirculation and its effects upon axial-flow pump power consumption 

    E-Print Network [OSTI]

    Prince, Tony M.

    1983-01-01

    1 Test Procedure Outline 2 Section and Pump Critical Flowrates and Speeds. 63 91 3 Power Coefficient and Reynolds Number Based on Cone Radius. 100 4 Power Coefficient and Reynolds Number Based on Surface Area. 101 5 Power Coefficient... Variation with NPSH with Q rl 54 Head Variation with NPSH with Q 2 . r2 55 Head Variation with NPSH with Q 3. r3' 120 128 129 130 131 134 135 136 CHAPTER I INTRODUCTION Pumps of different types are used to displace liquids from one location...

  10. Aerosol Indirect Effect on the Grid-scale Clouds in the Two-way Coupled WRF-CMAQ: Model Description, Development, Evaluation and Regional Analysis

    SciTech Connect (OSTI)

    Yu, Shaocai; Mathur, Rohit; Pleim, Jonathan; Wong, David; Gilliam, R.; Alapaty, Kiran; Zhao, Chun; Liu, Xiaohong

    2014-10-24

    This study implemented first, second and glaciations aerosol indirect effects (AIE) on resolved clouds in the two-way coupled WRF-CMAQ modeling system by including parameterizations for both cloud drop and ice number concentrations on the basis of CMAQpredicted aerosol distributions and WRF meteorological conditions. The performance of the newly-developed WRF-CMAQ model, with alternate CAM and RRTMG radiation schemes, was evaluated with the observations from the CERES satellite and surface monitoring networks (AQS, IMPROVE, CASTNet, STN, and PRISM) over the continental U.S. (CONUS) (12-km resolution) and eastern Texas (4-km resolution) during August and September of 2006. The results at the AQS surface sites show that in August, the NMB values for PM2.5 over the eastern/western U.S (EUS/WUS) and western U.S. (WUS) are 5.3% (?0.1%) and 0.4% (-5.2%) for WRF-CMAQ/CAM (WRF-CMAQ/RRTMG), respectively. The evaluation of PM2.5 chemical composition reveals that in August, WRF-CMAQ/CAM (WRF-CMAQ/RRTMG) consistently underestimated the observed SO4 2? by -23.0% (-27.7%), -12.5% (-18.9%) and -7.9% (-14.8%) over the EUS at the CASTNet, IMPROVE and STN sites, respectively. Both models (WRF-CMAQ/CAM, WRF-CMAQ/RRTMG) overestimated the observed mean OC, EC and TC concentrations over the EUS in August at the IMPROVE sites. Both models generally underestimated the cloud field (SWCF) over the CONUS in August due to the fact that the AIE on the subgrid convective clouds was not considered when the model simulations were run at the 12 km resolution. This is in agreement with the fact that both models captured SWCF and LWCF very well for the 4-km simulation over the eastern Texas when all clouds were resolved by the finer domain. Both models generally overestimated the observed precipitation by more than 40% mainly because of significant overestimation in the southern part of the CONUS in August. The simulations of WRF-CMAQ/CAM and WRF-CMAQ/RRTMG show dramatic improvements for SWCF, LWCF, COD, cloud fractions and precipitation over the ocean relative to those of WRF default cases in August. The model performance in September is similar to that in August except for greater overestimation of PM2.5 due to the overestimations of SO4 2-, NH4 +, NO3 -, and TC over the EUS, less underestimation of clouds (SWCF) over the land areas due to about 10% lower SWCF values and less convective clouds in September.

  11. Fast-wave Power Flow Along SOL Field Lines In NSTX nd The Associated Power Deposition Profile Across The SOL In Front Of The Antenna

    SciTech Connect (OSTI)

    Perkins, Roy

    2013-06-21

    Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface (LCFS) as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. Advanced RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.

  12. Control strategies for 2-quadrant converter used in grid power flow control

    E-Print Network [OSTI]

    Maestri, Sebastian; Uicich, Gustavo; Benedetti, Mario; Papastergiou, Konstantinos; Le Godec, Gilles

    2015-01-01

    This work presents the analysis of a two-quadrant regulator connected to the DC-link of a 4-quadrant magnet supply. The key objective is to present some regulation strategies for controlling the peak power required from the power network as well as to recover the magnet energy into capacitor banks. A comparative study that highlights the trade off between the size of reactive elements, and the peak current drawn from the electrical network is presented.

  13. Large amplitude oscillatory shear flow of gluten dough: A model power-law gel

    E-Print Network [OSTI]

    Ng, Trevor S. K.

    In a previous paper [T. S. K. Ng and G. H. McKinley, J. Rheol.52(2), 417–449 (2008)], we demonstrated that gluten gels can best be understood as a polymericnetwork with a power-law frequency response that reflects the ...

  14. System and method for measuring particles in a sample stream of a flow cytometer using a low power laser source

    DOE Patents [OSTI]

    Graves, Steven W; Habbersett, Robert C

    2013-10-22

    A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.

  15. System and method for measuring particles in a sample stream of a flow cytometer using low-power laser source

    DOE Patents [OSTI]

    Graves, Steven W.; Habbersett, Robert C.

    2014-07-01

    A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.

  16. Topological Performance Measures as Surrogates for Physical Flow Models for Risk and Vulnerability Analysis for Electric Power Systems

    E-Print Network [OSTI]

    LaRocca, Sarah; Hassel, Henrik; Guikema, Seth

    2013-01-01

    Critical infrastructure systems must be both robust and resilient in order to ensure the functioning of society. To improve the performance of such systems, we often use risk and vulnerability analysis to find and address system weaknesses. A critical component of such analyses is the ability to accurately determine the negative consequences of various types of failures in the system. Numerous mathematical and simulation models exist which can be used to this end. However, there are relatively few studies comparing the implications of using different modeling approaches in the context of comprehensive risk analysis of critical infrastructures. Thus in this paper, we suggest a classification of these models, which span from simple topologically-oriented models to advanced physical flow-based models. Here, we focus on electric power systems and present a study aimed at understanding the tradeoffs between simplicity and fidelity in models used in the context of risk analysis. Specifically, the purpose of this pa...

  17. Parallel computation of Gauss-Seidel type algorithms for power flow analysis 

    E-Print Network [OSTI]

    Ongsakul, Weerakorn

    1991-01-01

    of Iteration Numbers and CPU Time 25 ; III Comparison of CPU Time per Iteration and per Bus Iteration IV Number of Operations per Iteration per Bus 26 32. V Summary of Connections and Connectivity Degree in IEEE 14 Bus System VI Number of Colored Buses... in Standard IEEE System 61, VII Summary of Colored Bus Numbers 62 ' VIII CPU Times to Color Power System in 3 Colors 63 ' IX CPU Times Data to Color Texas 2429 Bus System as the Available Color Numbers Vary . X Color-by-Color Synchronized Implementation...

  18. Microsoft PowerPoint - Proposal-Review-Flow-Chart_2013.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on darkMicroorganismsnow widelySmallBPA Prepayment Program 202 Jon

  19. Nonlinear power flow feedback control for improved stability and performance of airfoil sections

    DOE Patents [OSTI]

    Wilson, David G.; Robinett, III, Rush D.

    2013-09-03

    A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, .alpha.. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K.sub.I, K.sub.p, and K.sub.d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.

  20. Adaptive Finite element approximation of steady flows of incompressible fluids with implicit power-law-like rheology

    E-Print Network [OSTI]

    Christian Kreuzer; Endre Süli

    2015-03-18

    We develop the a posteriori error analysis of finite element approximations of implicit power-law-like models for viscous incompressible fluids. The Cauchy stress and the symmetric part of the velocity gradient in the class of models under consideration are related by a, possibly multi--valued, maximal monotone $r$-graph, with $\\frac{2d}{d+1}finite element residual, as well as the local stability of the error bound. We then consider an adaptive finite element approximation of the problem, and, under suitable assumptions, we show the weak convergence of the adaptive algorithm to a weak solution of the boundary-value problem. The argument is based on a variety of weak compactness techniques, including Chacon's biting lemma and a finite element counterpart of the Acerbi--Fusco Lipschitz truncation of Sobolev functions, introduced by L. Diening, C. Kreuzer and E. S\\"uli [Finite element approximation of steady flows of incompressible fluids with implicit power-law-like rheology. SIAM J. Numer. Anal., 51(2), 984--1015].

  1. To cite this version : Rigo-Mariani, Rmy and Sareni, Bruno and Roboam, Xavier Fast Power Flow Scheduling and Sensitivity Analysis for Sizing a

    E-Print Network [OSTI]

    Mailhes, Corinne

    dispatching of power flows in a microgrid with storage. The investigated approach is based on the use Scheduling and Sensitivity Analysis for Sizing a Microgrid with Storage. (2014) In: 11th International FOR SIZING A MICROGRID WITH STORAGE R. Rigo-Mariani1 , B. Sareni1 , X. Roboam1 1. Université de Toulouse

  2. To cite this version : Rigo-Mariani, Rmy and Sareni, Bruno and Roboam, Xavier Fast Power Flow Scheduling and Sensitivity Analysis for Sizing a

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    for optimal dispatching of power flows in a microgrid with storage. The investigated approach is based Scheduling and Sensitivity Analysis for Sizing a Microgrid with Storage. (2014) In: 11th International ANALYSIS FOR SIZING A MICROGRID WITH STORAGE R. Rigo-Mariani1 , B. Sareni1 , X. Roboam1 1. Université de

  3. may also explain the larger extent of quiet Sun spicules1,2 mode power and granular flows are stronger by up to 50% and

    E-Print Network [OSTI]

    Johnson, Peter D.

    may also explain the larger extent of quiet Sun spicules1,2 where p- mode power and granular flows 2004; doi:10.1038/nature02749. 1. Beckers, J. M. Solar spicules. Sol. Phys. 3, 367­433 (1968). 2. Beckers, J. M. Solar spicules. Annu. Rev. Astron. Astrophys. 10, 73­100 (1972). 3. Sterling, A. C. Solar

  4. The Effects of a Two-Way Dual Language Immersion Environment on Elementary Mathematics TAKS Test Scores in Texas: An Overall Comparison and an Analysis of Questions With and Without a Visual Prompt 

    E-Print Network [OSTI]

    Beck, Shari A.

    2012-07-16

    included a comparison of Mathematics TAKS Test scaled scores for students in a two-way dual language immersion program and students enrolled in a monolingual educational program, an analysis comparing these two groups of students iv on nonvisual... scaled score comparisons between the two groups of students on the Spanish version of the Grade 4 Test. Major findings of the study included a higher performance shown on most subsets of visual questions compared to nonvisual questions for both groups...

  5. Optimization and Analysis of High-Power Hydrogen/Bromine-Flow Batteries for Grid-Scale Energy Storage

    SciTech Connect (OSTI)

    Cho, KT; Albertus, P; Battaglia, V; Kojic, A; Srinivasan, V; Weber, AZ

    2013-10-07

    For storage of grid-scale electrical energy, redox-flow batteries (RFBs) are considered promising technologies. This paper explores the influence of electrolyte composition and ion transport on cell performance by using an integrated approach of experiments and cost modeling. In particular, the impact of the area-specific resistance on system capability is elucidated for the hydrogen/bromine RFB. The experimental data demonstrate very good performance with 1.46 W cm(-2) peak power and 4 A cm(-2) limiting current density at ambient conditions for an optimal cell design and reactant concentrations. The data and cost model results show that higher concentrations of RFB reactants do not necessarily result in lower capital cost as there is a tradeoff between cell performance and storage (tank) requirements. In addition, the discharge time and overall efficiency demonstrate nonlinear effects on system cost, with a 3 to 4 hour minimum discharge time showing a key transition to a plateau in terms of cost for typical RFB systems. The presented results are applicable to many different RFB chemistries and technologies and highlight the importance of ohmic effects and associated area-specific resistance on RFB viability.

  6. In-space power rejection management via indirect annular flow liquid film management - process design and feasibility 

    E-Print Network [OSTI]

    Williams, Rube Ben

    1993-01-01

    flow and the required condensation rate. Large film thicknesses (small void fractions) are limited by the requirement that the condensing channels must discharge two-phase annular flow (discussed in this chapter, see FLOW REGIME RESTRICTION... Channel for Four Cases of the Ambient Radiation Load. The Void Fraction for Two-Phase Annular Flow was Predicted by the Wheeler Void Fraction Correlation . Figure 35. Comparison of the Void Fraction in a SLIC Condensing Channel for Four Cases...

  7. Determination of maximum reactor power level consistent with the requirement that flow reversal occurs without fuel damage

    SciTech Connect (OSTI)

    Rao, D.V.; Darby, J.L.; Ross, S.B.; Clark, R.A. [Science and Engineering Associates, Inc., Albuquerque, NM (United States)

    1990-04-19

    The High Flux Beam Reactor (HFBR) operated by Brookhaven National Laboratory (BNL) employs forced downflow for heat removal during normal operation. In the event of total loss of forced flow, the reactor will shutdown and the flow reversal valves open. When the downward core flow becomes sufficiently small then the opposing thermal buoyancy induces flow reversal leading to decay heat removal by natural convection. There is some uncertainty as to whether the natural circulation is adequate for decay heat removal after 60 MW operation. BNL- staff carried out a series of calculations to establish the adequacy of flow reversal to remove decay heat. Their calculations are based on a natural convective CHF model. The primary purpose of the present calculations is to review the accuracy and applicability of Fauske`s CHF model for the HFBR, and the assumptions and methodology employed by BNL-staff to determine the heat removal limit in the HFBR during a flow reversal and natural convection situation.

  8. Transport-driven scrape-off layer flows and the x-point dependence of the L-H power threshold in Alcator C-Mod

    SciTech Connect (OSTI)

    LaBombard, B.; Rice, J.E.; Hubbard, A.E.; Hughes, J.W.; Greenwald, M.; Granetz, R.S.; Irby, J.H.; Lin, Y.; Lipschultz, B.; Marmar, E.S.; Marr, K.; Mossessian, D.; Parker, R.; Rowan, W.; Smick, N.; Snipes, J.A.; Terry, J.L.; Wolfe, S.M.; Wukitch, S.J.

    2005-05-15

    Factor of {approx}2 higher power thresholds for low- to high-confinement mode transitions (L-H) with unfavorable x-point topologies in Alcator C-Mod [Phys. Plasmas 1, 1511 (1994)] are linked to flow boundary conditions imposed by the scrape-off layer (SOL). Ballooning-like transport drives flow along magnetic field lines from low- to high-field regions with toroidal direction dependent on upper/lower x-point balance; the toroidal rotation of the confined plasma responds, exhibiting a strong counter-current rotation when Bx{nabla}B points away from the x point. Increased auxiliary heating power (rf, no momentum input) leads to an L-H transition at approximately twice the edge electron pressure gradient when Bx{nabla}B points away. As gradients rise prior to the transition, toroidal rotation ramps toward the co-current direction; the H mode is seen when the counter-current rotation imposed by the SOL flow becomes compensated. Remarkably, L-H thresholds in lower-limited discharges are identical to lower x-point discharges; SOL flows are also found similar, suggesting a connection.

  9. Episodic jet power extracted from a spinning black hole surrounded by a neutrino-dominated accretion flow in gamma-ray bursts

    SciTech Connect (OSTI)

    Cao, Xinwu [Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030 (China); Liang, En-Wei [Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004 (China); Yuan, Ye-Fei, E-mail: cxw@shao.ac.cn, E-mail: lew@gxu.edu.cn, E-mail: yfyuan@ustc.edu.cn [Department of Astronomy, University of Sciences and Technology of China, Hefei, Anhui 230026 (China)

    2014-07-10

    It was suggested that the relativistic jets in gamma-ray bursts (GRBs) are powered via the Blandford-Znajek (BZ) mechanism or the annihilation of neutrinos and anti-neutrinos from a neutrino cooling-dominated accretion flow (NDAF). The advection and diffusion of the large-scale magnetic field of an NDAF is calculated, and the external magnetic field is found to be dragged inward efficiently by the accretion flow for a typical magnetic Prandtl number P{sub m}=?/??1. The maximal BZ jet power can be ?10{sup 53}-10{sup 54} erg s{sup –1} for an extreme Kerr black hole, if an external magnetic field with 10{sup 14} Gauss is advected by the NDAF. This is roughly consistent with the field strength of the disk formed after a tidal disrupted magnetar. The accretion flow near the black hole horizon is arrested by the magnetic field if the accretion rate is below than a critical value for a given external field. The arrested accretion flow fails to drag the field inward and the field strength decays, and then the accretion re-starts, which leads to oscillating accretion. The typical timescale of such episodic accretion is of an order of one second. This can qualitatively explain the observed oscillation in the soft extended emission of short-type GRBs.

  10. Journal of Power Sources 156 (2006) 369374 Predicting the transient response of a serpentine flow-field PEMFC

    E-Print Network [OSTI]

    Van Zee, John W.

    2006-01-01

    -field PEMFC II: Normal to minimal fuel and AIR S. Shimpaleea, W.-K. Leea, J.W. Van Zeea,, H. Naseri in a PEMFC during operation with fixed normal stoichiometic flow rates of hydrogen and air for a 1.0 V s-1 of PEMFCs with fixed gas flow rates may expose the MEA to various degrees of stoichiometry for either

  11. The heat recovery steam generator (HRSG) is a key component of Combined Cycle Power Plants (CCPP). The exhaust (flue gas) from the CCPP gas turbine flows through the HRSG -this gas typically contains a high

    E-Print Network [OSTI]

    The heat recovery steam generator (HRSG) is a key component of Combined Cycle Power Plants (CCPP). The exhaust (flue gas) from the CCPP gas turbine flows through the HRSG - this gas typically contains a high

  12. Pressure-Driven Laminar Flow in Tangential Microchannels: an Elastomeric Microfluidic

    E-Print Network [OSTI]

    Gardel, Margaret

    , Massachusetts 02138 This paper describes laminar fluid flow through a three- dimensional elastomericPressure-Driven Laminar Flow in Tangential Microchannels: an Elastomeric Microfluidic Switch Rustem-to-face (typically at a 90° angle), with the fluid flows in tangential contact. There are two ways to control fluid

  13. A Simple Optimal Power Flow Model with Energy Storage K. Mani Chandy, Steven H. Low, Ufuk Topcu and Huan Xu

    E-Print Network [OSTI]

    Xu, Huan

    is motivated by the intensifying trend to deploy renewable energy such as wind or solar power. In the state and Huan Xu Abstract-- The integration of renewable energy generation, such as wind power in the Tehachapi area in California [10]. Not only is renewable energy more environmentally friendly, but its

  14. An Energy-Flow Model for Self-Powered Routers and its Application for Energy-Aware Routing

    E-Print Network [OSTI]

    Belding-Royer, Elizabeth M.

    of electrical energy. Depen- dence on renewable energy sources and variable power consump- tion make harvesting equipment hardware specifi- cations; high resolution, time-varying weather information settings, rural wireless deploy- ments often have to face the lack of reliable grid power infrastruc- ture

  15. Redox Flow Batteries, a Review

    E-Print Network [OSTI]

    Weber, Adam Z.

    2013-01-01

    of a Vanadium Redox-Flow Battery to Maintain Power Quality,"Fuel System Using Redox Flow Battery," ed: WO Patentand D. B. Hickey, "Redox Flow Battery System for Distributed

  16. Study of Power Converter Topologies with Energy Recovery and grid power flow control. Part A: 2-quadrant converter with energy storage.

    E-Print Network [OSTI]

    Maestri, S; Uicich, G; Benedetti, M; Le Godec, G; Papastergiou, K

    2015-01-01

    In the framework of a Transfer line (TT2) Consolidation Programme, a number of studies on Energy cycling have been commissioned. Part of this work involves the study of different power electronic system topologies for magnet energy recovery [1{5]. In this report, the use of a two-quadrant (2Q) regulator connected to the DC link of a 4-quadrant magnet supply is analysed. The key objective of the study is to find control strategies that result in the control of the peak power required from the power network as well as to recover the magnet energy into capacitor banks with controlled voltage fluctuation. The study comprises the modelling of the system by means of the method of state averaging and the development of regulation strategies to energy management. The proposed control strategies can be divided in two groups: in the first group, the magnet current is used to dene the reference for the control system, while in the second group this current is considered as a perturbation and some strategies are devised ...

  17. A Simple Optimal Power Flow Model with Energy Storage K. Mani Chandy, Steven H. Low, Ufuk Topcu and Huan Xu

    E-Print Network [OSTI]

    Chandy, K. Mani

    time periods. The model is motivated by the intensifying trend to deploy renewable energy such as wind and Huan Xu Abstract-- The integration of renewable energy, such as wind power, into the electric grid from wind projects in the Tehachapi area in California [9]. Not only is renewable energy more

  18. Flow Injection Analysis in a Microfluidic Format Andrew M. Leach, Aaron R. Wheeler, and Richard N. Zare*

    E-Print Network [OSTI]

    Zare, Richard N.

    Flow Injection Analysis in a Microfluidic Format Andrew M. Leach, Aaron R. Wheeler, and Richard N should be addressed email: zare@stanford.edu #12;2 ABSTRACT A microfluidic flow injection analysis system the operation of a standard six-port, two-way valve used in conventional liquid chromatography and flow

  19. Non--Atomic Components of Data Flow Diagrams: Stores, Persistent Flows,

    E-Print Network [OSTI]

    Symanzik, Jürgen

    Non--Atomic Components of Data Flow Diagrams: Stores, Persistent Flows, and Tests for Empty Flows J NON--ATOMIC COMPONENTS OF DATA FLOW DIAGRAMS: STORES, PERSISTENT FLOWS, AND TESTS FOR EMPTY FLOWS of these common features of traditional Data Flow Diagrams elevates the expressive power of FDFD's, or whether

  20. Dissecting the pressure field in tidal flow

    E-Print Network [OSTI]

    Dissecting the pressure field in tidal flow past a headland: When is form drag "real?" Sally Warner of oscillating flow H L HL velocity form drag power average power floodslack work done on system #12;0 0 0 0 90 180 270 360 90 180 270 360 0 degrees Drag of oscillating flow H L HL velocity form drag power average

  1. Soft Magnetic Materials in High-Frequency, High-Power Conversion Applications

    E-Print Network [OSTI]

    McHenry, Michael E.

    and facilitate two-way power conversion.7 Flexible alternating current (AC) Transmission Systems (FACTS) and High Voltage DC (HVDC) technologies aim to improve the effi- ciency of power networks and benefit from highSoft Magnetic Materials in High-Frequency, High-Power Conversion Applications ALEX M. LEARY,1

  2. Improving the Capacity in Wireless Networks Through Integrated Channel Base Station and Power Assignment

    E-Print Network [OSTI]

    Tassiulas, Leandros

    Improving the Capacity in Wireless Networks Through Integrated Channel Base Station and Power Allocation Algorithm (JRAA) that makes the channel base station and power assignment in a wireless net­ work base station and power assign­ ment. Finally several versions of the two­way channel assignment problem

  3. EERE PowerPoint 97-2004 Template: Green Version

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    determine resource temperature that matched reported flow and power production - Modeled steam flow using turbine (choked flow) and assuming lowest reported well head temperature...

  4. Copyright 2013 IEEE. Reprinted, with permission from: Line Limit Preserving Power System Equivalent

    E-Print Network [OSTI]

    system. Line limits are a fundamental part of the formulation for Power Flow problems, Optimal Power Flow (OPF) problems and Security-Constrained Optimal Power Flow (SCOPF) problems for electric power systems generation or loads

  5. Anisotropic flow

    E-Print Network [OSTI]

    S. A. Voloshin

    2002-11-20

    Recent experimental results on directed and elliptic flow, theoretical developments, and new techniques for anisotropic flow analysis are reviewed.

  6. Estimation of steady-state and transcient power distributions for the RELAP analyses of the 1963 loss-of-flow and loss-of-pressure tests at BR2.

    SciTech Connect (OSTI)

    Dionne, B.; Tzanos, C. P.

    2011-05-23

    To support the safety analyses required for the conversion of the Belgian Reactor 2 (BR2) from highly-enriched uranium (HEU) to low-enriched uranium (LEU) fuel, the simulation of a number of loss-of-flow tests, with or without loss of pressure, has been undertaken. These tests were performed at BR2 in 1963 and used instrumented fuel assemblies (FAs) with thermocouples (TC) imbedded in the cladding as well as probes to measure the FAs power on the basis of their coolant temperature rise. The availability of experimental data for these tests offers an opportunity to better establish the credibility of the RELAP5-3D model and methodology used in the conversion analysis. In order to support the HEU to LEU conversion safety analyses of the BR2 reactor, RELAP simulations of a number of loss-of-flow/loss-of-pressure tests have been undertaken. Preliminary analyses showed that the conservative power distributions used historically in the BR2 RELAP model resulted in a significant overestimation of the peak cladding temperature during the transient. Therefore, it was concluded that better estimates of the steady-state and decay power distributions were needed to accurately predict the cladding temperatures measured during the tests and establish the credibility of the RELAP model and methodology. The new approach ('best estimate' methodology) uses the MCNP5, ORIGEN-2 and BERYL codes to obtain steady-state and decay power distributions for the BR2 core during the tests A/400/1, C/600/3 and F/400/1. This methodology can be easily extended to simulate any BR2 core configuration. Comparisons with measured peak cladding temperatures showed a much better agreement when power distributions obtained with the new methodology are used.

  7. 7-29 A coal-burning power plant produces 300 MW of power. The amount of coal consumed during a one-day period and the rate of air flowing through the furnace are to be determined.

    E-Print Network [OSTI]

    Bahrami, Majid

    7-11 7-29 A coal-burning power plant produces 300 MW of power. The amount of coal consumed during The power plant operates steadily. 2 The kinetic and potential energy changes are zero. Properties The heating value of the coal is given to be 28,000 kJ/kg. Analysis (a) The rate and the amount of heat inputs

  8. Power transaction issues in deregulated power systems 

    E-Print Network [OSTI]

    Roycourt, Henrik

    2000-01-01

    is to review the power flow problem and the newly emerging concept of Available Transfer Capability (ATC) / Total Transfer Capability (TTC). Secondly, it aims at reviewing and implementing in the Matlab environment a technique for tracing the contributions...

  9. Development of a concentrating solar power system using fluidized-bed technology for thermal energy conversion and solid particles for thermal energy storage

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ma, Z.; Mehos, M.; Glatzmaier, G.; Sakadjian, B. B.

    2015-05-01

    Concentrating solar power (CSP) is an effective way to convert solar energy into electricity with an economic energy-storage capability for grid-scale, dispatchable renewable power generation. However, CSP plants need to reduce costs to be competitive with other power generation methods. Two ways to reduce CSP cost are to increase solar-to-electric efficiency by supporting a high-efficiency power conversion system, and to use low-cost materials in the system. The current nitrate-based molten-salt systems have limited potential for cost reduction and improved power-conversion efficiency with high operating temperatures. Even with significant improvements in operating performance, these systems face challenges in satisfying the costmore »and performance targets. This paper introduces a novel CSP system with high-temperature capability that can be integrated into a high-efficiency CSP plant and that meets the low-cost, high-performance CSP targets. Unlike a conventional salt-based CSP plant, this design uses gas/solid, two-phase flow as the heat-transfer fluid (HTF); separated solid particles as storage media; and stable, inexpensive materials for the high-temperature receiver and energy storage containment. We highlight the economic and performance benefits of this innovative CSP system design, which has thermal energy storage capability for base-load power generation.« less

  10. Vehicle Technologies Office: Power Electronics | Department of...

    Broader source: Energy.gov (indexed) [DOE]

    Office (VTO) is supporting research to lower the cost and improve the performance of power electronics. Vehicle power electronics primarily process and control the flow of...

  11. An Energy-Based Approach to Power System Analysis

    E-Print Network [OSTI]

    Caliskan, Sina Yamac

    2015-01-01

    loads, Electrical Power and Energy Systems, Vol. 8, Issue 1,equation, Electrical Power & Energy Systems, Vol. 3, No. 3,In contemporary power systems, energy flows from the

  12. Hardware Prototyping of Two-Way Relay Systems 

    E-Print Network [OSTI]

    Wu, Qiong

    2012-10-19

    - bedded controller in PXI Express systems, with a 2.3 GHz dual-core processor and dual-channel 667 MHz DDR2 memory. It also has up to 4 Gb per second bandwidth interface to the chassis kit. As shown in Fig. 6, it also equipped with several Ethernet...

  13. Avoiding Predation Two Ways to Avoid Getting Eaten

    E-Print Network [OSTI]

    Brown, Christopher A.

    boatmen avoid areas with cannibalistic adults Forage in lower quality parts of pond #12;2 Predator tail-flagging and stotting Clockwise from left: monarch caterpillar; yellowjackets; giant mesquite bugs

  14. Robust Beamforming for Two-Way Relay Systems 

    E-Print Network [OSTI]

    Aziz, Ahsan

    2013-08-14

    (CSI). For such a TWR, we formulate a robust optimization problem that takes into ac- count norm-bounded estimation errors in CSI and designs an optimal beamforming matrix. Realizing the fact that this problem is extremely hard to solve globally, we...

  15. Alternating TwoWay ACTree Automata # Kumar Neeraj Verma 1,#

    E-Print Network [OSTI]

    Doyen, Laurent

    # Partially supported by the ACI VERNAM, the RNTL project EVA, the RNTL project Prouvé, and the ACI jeunes in hardware or soft­ ware verification (Jouannaud, 1995). We may enrich standard tree automata with various

  16. Pivot Cheat Sheet Two Ways to Easily Search for Opportunities

    E-Print Network [OSTI]

    Reif, John H.

    that in the Search window while Search by text is highlighted. 4. Otherwise, click Advanced Search to enter terms of interest. 5. Enter terms for searching and note that it is a Boolean search engine. You can exclude search by text or by sponsor. 3. If you are searching for a particular RFA and you know the number, enter

  17. An Energy-Flow Model for Self-Powered Routers in Rural Mesh Networks and its Application for Energy-Aware Routing 

    E-Print Network [OSTI]

    Pejovic, Veljko; Belding, Elizabeth; Marina, Mahesh

    Self-powered wireless mesh networks have gained popularity as a cheap alternative for providing Internet access in many rural areas of the developed and, especially, the developing world. The quality of service that ...

  18. A COMPUTATIONAL ANALYSIS OF THE OPTIMAL POWER FLOW PROBLEM Baha Alzalg, Catalina Anghel, Wenying Gan, Qing Huang, Mustazee Rahman, Alex Shum

    E-Print Network [OSTI]

    under these contingencies was exemplified by the blackout in the North American power grid during 2003. The reason for the blackout was a failure of only a handful of contingencies in the network [8

  19. Wind Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Wind Power Bioenergy Power Systems Wind Power Wind Power Main Page Outreach Programs Image Gallery FAQs Links Software Hydro Power INL Home Wind Power Introduction The Wind Power...

  20. 600-T Magnetic Fields due to Cold Electron Flow in a simple Cu-Coil irradiated by High Power Laser pulses

    E-Print Network [OSTI]

    Zhu, Baojun; Yuan, Dawei; Li, Yanfei; Li, Fang; Liao, Guoqian; Zhao, Jiarui; Zhong, Jiayong; Xue, Feibiao; Wei, Huigang; Zhang, Kai; Han, Bo; Pei, Xiaoxing; Liu, Chang; Zhang, Zhe; Wang, Weimin; Zhu, Jianqiang; Zhao, Gang; Zhang, Jie

    2015-01-01

    A new simple mechanism due to cold electron flow to produce strong magnetic field is proposed. A 600-T strong magnetic field is generated in the free space at the laser intensity of 5.7x10^15 Wcm^-2. Theoretical analysis indicates that the magnetic field strength is proportional to laser intensity. Such a strong magnetic field offers a new experimental test bed to study laser-plasma physics, in particular, fast-ignition laser fusion research and laboratory astrophysics.

  1. Reliability Evaluation of Electric Power Generation Systems with Solar Power 

    E-Print Network [OSTI]

    Samadi, Saeed

    2013-11-08

    Conventional power generators are fueled by natural gas, steam, or water flow. These generators can respond to fluctuating load by varying the fuel input that is done by a valve control. Renewable power generators such as ...

  2. Subcooled flow boiling of fluorocarbons

    E-Print Network [OSTI]

    Murphy, Richard Walter

    1971-01-01

    A study was conducted of heat transfer and hydrodynamic behavior for subcooled flow boiling of Freon-113, one of a group of fluorocarbons suitable for use in cooling of high-power-density electronic components. Problems ...

  3. Power inverters

    DOE Patents [OSTI]

    Miller, David H. (Redondo Beach, CA); Korich, Mark D. (Chino Hills, CA); Smith, Gregory S. (Woodland Hills, CA)

    2011-11-15

    Power inverters include a frame and a power module. The frame has a sidewall including an opening and defining a fluid passageway. The power module is coupled to the frame over the opening and includes a substrate, die, and an encasement. The substrate includes a first side, a second side, a center, an outer periphery, and an outer edge, and the first side of the substrate comprises a first outer layer including a metal material. The die are positioned in the substrate center and are coupled to the substrate first side. The encasement is molded over the outer periphery on the substrate first side, the substrate second side, and the substrate outer edge and around the die. The encasement, coupled to the substrate, forms a seal with the metal material. The second side of the substrate is positioned to directly contact a fluid flowing through the fluid passageway.

  4. US energy flow, 1991

    SciTech Connect (OSTI)

    Borg, I.Y.; Briggs, C.K.

    1992-06-01

    Trends in energy consumption and assessment of energy sources are discussed. Specific topics discussed include: energy flow charts; comparison of energy use with 1990 and earlier years; supply and demand of fossil fuels (oils, natural gas, coal); electrical supply and demand; and nuclear power.

  5. ENERGY FLOWS CLIMATE CHANGE

    E-Print Network [OSTI]

    Schwartz, Stephen E.

    ENERGY FLOWS FORCINGS CLIMATE CHANGE A REALLY TOUGH PROBLEM Stephen E. Schwartz, BNL, 7-20-11 www average temperature 15°C or 59°F #12;ATMOSPHERIC RADIATION Power per area Energy per time per area Unit" temperature to radiative flux. #12;GLOBAL ENERGY BALANCE Global and annual average energy fluxes in watts per

  6. Mesofluidic magnetohydrodynamic power generation

    E-Print Network [OSTI]

    Fucetola, Jay J

    2012-01-01

    Much of the previous research into magnetohydrodynamics has involved large-scale systems. This thesis explores the miniaturization and use of devices to convert the power dissipated within an expanding gas flow into ...

  7. Power Plant Power Plant

    E-Print Network [OSTI]

    Stillwater Power Plant Wabuska Power Plant Casa Diablo Power Plant Glass Mountain Geothermal Area Lassen Geothermal Area Coso Hot Springs Power Plants Lake City Geothermal Area Thermo Geothermal Area Lakeview Geothermal Area Raft River Geothermal Area Cove Fort Power Plant Roosevelt Power Plant Borax Lake

  8. CERN-PS Main Power Converter Renovation How to Provide and Control the Large Flow of Energy for a Rapid Cyclic Machine?

    E-Print Network [OSTI]

    Bordry, Frederick; Völker, F V

    2005-01-01

    The PS accelerator (Proton-Synchrotron) at CERN, which is part of the LHC injector chain, is composed of one hundred magnets connected in series. During a typical acceleration cycle (taking 2.4 seconds), the active power at the magnet terminals varies from plus to minus 40 MW. As this large active power variation was not acceptable to the electrical network, a motor-generator set (M-G) was inserted between the grid and the load. The M-G set (of 1968) acts as a fly-wheel with a stored kinetic energy of 233 MJ and the magnets are fed via two 12-pulse thyristor rectifiers. A renovation or replacement of the installation is planned in the near future as part of the consolidation of the LHC injectors to avoid any major breakdown, to improve overall availability and to reduce operation and maintenance costs. This paper presents a first comparison of technical solutions available to build such a power system and the strategy that will be applied for the up-grade of the system.

  9. Derivation of Locational Marginal Prices for Restructured Wholesale Power Markets

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    the performance of these markets. In this paper, different AC and DC optimal power flow (OPF) models are presented Operator (MISO). Keywords: Locational marginal pricing, wholesale power market, AC optimal power flow, DC optimal power flow, U.S. Midwest Independent System Operator (MISO). #12;3 1 INTRODUCTION In an April 2003

  10. Thermoelectric power generator for variable thermal power source

    DOE Patents [OSTI]

    Bell, Lon E; Crane, Douglas Todd

    2015-04-14

    Traditional power generation systems using thermoelectric power generators are designed to operate most efficiently for a single operating condition. The present invention provides a power generation system in which the characteristics of the thermoelectrics, the flow of the thermal power, and the operational characteristics of the power generator are monitored and controlled such that higher operation efficiencies and/or higher output powers can be maintained with variably thermal power input. Such a system is particularly beneficial in variable thermal power source systems, such as recovering power from the waste heat generated in the exhaust of combustion engines.

  11. FLUX ENHANCEMENT IN CROSSFLOW MEMBRANE FILTRATION: FOULING AND IT'S MINIMIZATION BY FLOW REVERSAL

    SciTech Connect (OSTI)

    Shamsuddin Ilias

    2005-01-25

    Fouling problems are perhaps the single most important reason for relatively slow acceptance of ultrafiltration in many areas of chemical and biological processing. To overcome the losses in permeate flux associated with concentration polarization and fouling in cross flow membrane filtration, we investigated the concept of flow reversal as a method to enhance membrane flux in ultrafiltration. Conceptually, flow reversal prevents the formation of stable hydrodynamic and concentration boundary layers at or near the membrane surface. Further more, periodic reversal of the flow direction of the feed stream at the membrane surface results in prevention and mitigation of membrane fouling. Consequently, these advantages are expected to enhance membrane flux significantly. A crossflow membrane filtration unit was designed and built to test the concept of periodic flow reversal for flux enhancement. The essential elements of the system include a crossflow hollow fiber membrane module integrated with a two-way valve to direct the feed flow directions. The two-way valve is controlled by a controller-timer for periodic reversal of flow of feed stream. Another important feature of the system is that with changing feed flow direction, the permeate flow direction is also changed to maintain countercurrent feed and permeate flows for enhanced mass transfer driving force (concentration difference). In this report, we report our application of Flow Reversal technique in clarification of apple juice containing pectin. The presence of pectin in apple juice makes the clarification process difficult and is believed to cause membrane fouling. Of all compounds found in apple juice, pectin is most often identified as the major hindrance to filtration performance. Based on our ultrafiltration experiments with apple juice, we conclude that under flow reversal conditions, the permeate flux is significantly enhanced when compared with the conventional unidirectional flow. Thus, flow reversal technology seems an attractive alternative to mitigate fouling problem in crossflow membrane filtration.

  12. The gradient flow in simple field theories

    E-Print Network [OSTI]

    Monahan, Christopher

    2015-01-01

    The gradient flow is a valuable tool for the lattice community, with applications from scale-setting to implementing chiral fermions. Here I focus on the gradient flow as a means to suppress power-divergent mixing. Power-divergent mixing stems from the hypercubic symmetry of the lattice regulator and is a particular difficulty for calculations of, for example, high moments of parton distribution functions. The gradient flow removes power-divergent mixing on the lattice, provided the flow time is kept fixed in physical units, at the expense of introducing a new physical scale in the continuum. One approach to dealing with this new scale is the smeared operator product expansion, a formalism that systematically connects nonperturbative calculations of flowed operators to continuum physics. I study the role of the gradient flow in suppressing power-divergent mixing and present the first nonperturbative study in scalar field theory.

  13. The gradient flow in simple field theories

    E-Print Network [OSTI]

    Christopher Monahan

    2015-12-01

    The gradient flow is a valuable tool for the lattice community, with applications from scale-setting to implementing chiral fermions. Here I focus on the gradient flow as a means to suppress power-divergent mixing. Power-divergent mixing stems from the hypercubic symmetry of the lattice regulator and is a particular difficulty for calculations of, for example, high moments of parton distribution functions. The gradient flow removes power-divergent mixing on the lattice, provided the flow time is kept fixed in physical units, at the expense of introducing a new physical scale in the continuum. One approach to dealing with this new scale is the smeared operator product expansion, a formalism that systematically connects nonperturbative calculations of flowed operators to continuum physics. I study the role of the gradient flow in suppressing power-divergent mixing and present the first nonperturbative study in scalar field theory.

  14. Flow chamber

    DOE Patents [OSTI]

    Morozov, Victor (Manassas, VA)

    2011-01-18

    A flow chamber having a vacuum chamber and a specimen chamber. The specimen chamber may have an opening through which a fluid may be introduced and an opening through which the fluid may exit. The vacuum chamber may have an opening through which contents of the vacuum chamber may be evacuated. A portion of the flow chamber may be flexible, and a vacuum may be used to hold the components of the flow chamber together.

  15. Chemical preconcentrator with integral thermal flow sensor

    DOE Patents [OSTI]

    Manginell, Ronald P. (Albuquerque, NM); Frye-Mason, Gregory C. (Cedar Crest, NM)

    2003-01-01

    A chemical preconcentrator with integral thermal flow sensor can be used to accurately measure fluid flow rate in a microanalytical system. The thermal flow sensor can be operated in either constant temperature or constant power mode and variants thereof. The chemical preconcentrator with integral thermal flow sensor can be fabricated with the same MEMS technology as the rest of the microanlaytical system. Because of its low heat capacity, low-loss, and small size, the chemical preconcentrator with integral thermal flow sensor is fast and efficient enough to be used in battery-powered, portable microanalytical systems.

  16. Geological flows

    E-Print Network [OSTI]

    Yu. N. Bratkov

    2008-11-19

    In this paper geology and planetology are considered using new conceptual basis of high-speed flow dynamics. Recent photo technics allow to see all details of a flow, 'cause the flow is static during very short time interval. On the other hand, maps and images of many planets are accessible. Identity of geological flows and high-speed gas dynamics is demonstrated. There is another time scale, and no more. All results, as far as the concept, are new and belong to the author. No formulae, pictures only.

  17. Flow regimes

    SciTech Connect (OSTI)

    Liles, D.R.

    1982-01-01

    Internal boundaries in multiphase flow greatly complicate fluid-dynamic and heat-transfer descriptions. Different flow regimes or topological configurations can have radically dissimilar interfacial and wall mass, momentum, and energy exchanges. To model the flow dynamics properly requires estimates of these rates. In this paper the common flow regimes for gas-liquid systems are defined and the techniques used to estimate the extent of a particular regime are described. Also, the current computer-code procedures are delineated and introduce a potentially better method is introduced.

  18. Renaissance in Flow-Cell Technologies Recent Advancements and Future Opportunities

    E-Print Network [OSTI]

    Electrodes Thick = High Energy Thin = High Power 4 #12;uper or s y UTC Proprietary Flow Batteries cells Flow Battery SystemFlow Battery System Electrolyte flow Ion exchange membrane Cell stack (power System Architectures Proton Exchange Membrane Flow Batteries: Energy stored in solutions

  19. FLUX ENHANCEMENT IN CROSSFLOW MEMBRANE FILTRATION: FOULING AND IT'S MINIMIZATION BY FLOW REVERSAL

    SciTech Connect (OSTI)

    Shamsuddin Ilias

    2004-06-14

    Fouling problems are perhaps the single most important reason for relatively slow acceptance of ultrafiltration in many areas of chemical and biological processing. To overcome the losses in permeate flux associated with concentration polarization and fouling in cross flow membrane filtration, we investigated the concept of flow reversal as a method to enhance membrane flux in ultrafiltration. Conceptually, flow reversal prevents the formation of stable hydrodynamic and concentration boundary layers at or near the membrane surface. Further more, periodic reversal of the flow direction of the feed stream at the membrane surface results in prevention and mitigation of membrane fouling. Consequently, these advantages are expected to enhance membrane flux significantly. A crossflow membrane filtration unit was designed and built to test the concept of periodic flow reversal for flux enhancement. The essential elements of the system include a crossflow hollow fiber membrane module integrated with a two-way valve to direct the feed flow directions. The two-way valve is controlled by a controller-timer for periodic reversal of flow of feed stream. Another important feature of the system is that with changing feed flow direction, the permeate flow direction is also changed to maintain countercurrent feed and permeate flows for enhanced mass transfer driving force (concentration difference). In our previous report, we reported our work on UF of BSA. In this report, we report our continuing application of Flow Reversal technique in clarification of apple juice containing pectin. The presence of pectin in apple juice makes the clarification process difficult and is believed to cause membrane fouling. Of all compounds found in apple juice, pectin is most often identified as the major hindrance to filtration performance. Laboratory-scale tests on a hollow-fiber ultrafiltration membrane module using pectin in apple juice as feed show that under flow reversal conditions, the permeate flux is significantly enhanced when compared with the conventional unidirectional flow.

  20. Flux Enhancement in Crossflow Membrane Filtration: Fouling and It's Minimization by Flow Reversal

    SciTech Connect (OSTI)

    Shamsuddin Ilias

    2005-08-04

    Fouling problems are perhaps the single most important reason for relatively slow acceptance of ultrafiltration in many areas of chemical and biological processing. To overcome the losses in permeate flux associated with concentration polarization and fouling in cross flow membrane filtration, we investigated the concept of flow reversal as a method to enhance membrane flux in ultrafiltration. Conceptually, flow reversal prevents the formation of stable hydrodynamic and concentration boundary layers at or near the membrane surface. Further more, periodic reversal of the flow direction of the feed stream at the membrane surface results in prevention and mitigation of membrane fouling. Consequently, these advantages are expected to enhance membrane flux significantly. A crossflow membrane filtration unit was designed and built to test the concept of periodic flow reversal for flux enhancement. The essential elements of the system include a crossflow hollow fiber membrane module integrated with a two-way valve to direct the feed flow directions. The two-way valve is controlled by a controller-timer for periodic reversal of flow of feed stream. Another important feature of the system is that with changing feed flow direction, the permeate flow direction is also changed to maintain countercurrent feed and permeate flows for enhanced mass transfer driving force (concentration difference). Three feed solutions (Bovine serum albumin (BSA), apple juice and citrus fruit pectin) were studied in crossflow membrane filtration. These solutes are well-known in membrane filtration for their fouling and concentration polarization potentials. Laboratory-scale tests on a hollow-fiber ultrafiltration membrane module using each of the feed solutes show that under flow reversal conditions, the permeate flux is significantly enhanced when compared with the conventional unidirectional flow. The flux enhancement is dramatic (by an order of magnitude) with increased feed concentration and operating transmembrane pressure. Thus, flow reversal technology seems an attractive alternative to mitigate fouling problem in crossflow membrane filtration.

  1. IEEE Network September/October 20112 0890-8044/11/$25.00 2011 IEEE he smart power grid uses information and communica-

    E-Print Network [OSTI]

    Koutsopoulos, Iordanis

    IEEE Network · September/October 20112 0890-8044/11/$25.00 © 2011 IEEE he smart power grid uses, distributed micro-generator premises, and electric storage premises. Smart metering and two-way com, grid reliability is increased, as the likelihood of power outage due to sudden increase of demand

  2. Membrane-less hydrogen bromine flow battery

    E-Print Network [OSTI]

    Braff, W A; Buie, C R

    2014-01-01

    In order for the widely discussed benefits of flow batteries for electrochemical energy storage to be applied at large scale, the cost of the electrochemical stack must come down substantially. One promising avenue for reducing stack cost is to increase the system power density while maintaining efficiency, enabling smaller stacks. Here we report on a membrane-less, hydrogen bromine laminar flow battery as a potential high power density solution. The membrane-less design enables power densities of 0.795 W cm$^{-2}$ at room temperature and atmospheric pressure, with a round-trip voltage efficiency of 92\\% at 25\\% of peak power. Theoretical solutions are also presented to guide the design of future laminar flow batteries. The high power density achieved by the hydrogen bromine laminar flow battery, along with the potential for rechargeable operation, will translate into smaller, inexpensive systems that could revolutionize the fields of large-scale energy storage and portable power systems.

  3. FUTURE POWER GRID INITIATIVE Future Power Grid

    E-Print Network [OSTI]

    of all 16 machines damped quickly ­ improved frequency performance » AGC ensures tie line power flows on the Electricity Infrastructure Operations Center (EIOC), the Pacific Northwest National Laboratory's (PNNL) national electric grid research facility, the FPGI will advance the science and develop the technologies

  4. Piezoelectric axial flow microvalve

    DOE Patents [OSTI]

    Gemmen, Randall; Thornton, Jimmy; Vipperman, Jeffrey S.; Clark, William W.

    2007-01-09

    This invention is directed to a fuel cell operable with a quantity of fuel and a quantity of an oxidizer to produce electrical power, the fuel cell including a fuel cell body including a labyrinth system structured to permit the fuel and the oxidizer to flow therethrough; at least a first catalyst in fluid communication with the labyrinth; and at least a first microvalve operably disposed within at least a portion of the labyrinth. The microvalve utilizes a deflectable member operable upon the application of a voltage from a voltage source. The microvalve includes an elongated flow channel formed therein and extending substantially longitudinally between the first and second ends to permit substantially longitudinal flow of the fluid therethrough and between the first and second ends; and the deflectable member disposed on the valve body, the deflectable member including at least a first piezoelectric portion that is piezoelectrically operable to deflect the deflectable member between an open position and a closed position upon the application of a voltage, the deflectable member in the closed position being operable to resist the flow of the fluid through the flow channel.

  5. Breakthrough Flow Battery Cell Stack: Transformative Electrochemical Flow Storage System (TEFSS)

    SciTech Connect (OSTI)

    2010-09-09

    GRIDS Project: UTRC is developing a flow battery with a unique design that provides significantly more power than today's flow battery systems. A flow battery is a cross between a traditional battery and a fuel cell. Flow batteries store their energy in external tanks instead of inside the cell itself. Flow batteries have traditionally been expensive because the battery cell stack, where the chemical reaction takes place, is costly. In this project, UTRC is developing a new stack design that achieves 10 times higher power than today’s flow batteries. This high power output means the size of the cell stack can be smaller, reducing the amount of expensive materials that are needed. UTRC’s flow battery will reduce the cost of storing electricity for the electric grid, making widespread use feasible.

  6. Energy Storage for the Power Grid

    ScienceCinema (OSTI)

    Wang, Wei; Imhoff, Carl; Vaishnav, Dave

    2014-06-12

    The iron vanadium redox flow battery was developed by researchers at Pacific Northwest National Laboratory as a solution to large-scale energy storage for the power grid.

  7. Energy Storage for the Power Grid

    SciTech Connect (OSTI)

    Wang, Wei; Imhoff, Carl; Vaishnav, Dave

    2014-04-23

    The iron vanadium redox flow battery was developed by researchers at Pacific Northwest National Laboratory as a solution to large-scale energy storage for the power grid.

  8. Hydrodynamics, heat transfer and flow boiling instabilities in microchannels 

    E-Print Network [OSTI]

    Barber, Jacqueline Claire

    2010-01-01

    Boiling in microchannels is a very efficient mode of heat transfer with high heat and mass transfer coefficients achieved. Less pumping power is required for two-phase flows than for single-phase liquid flows to achieve ...

  9. Efficiency combined cycle power plant

    SciTech Connect (OSTI)

    Pavel, J.; Meyers, G.A.; Baldwin, T.S.

    1990-06-12

    This patent describes a method of operating a combined cycle power plant. It comprises: flowing exhaust gas from a combustion turbine through a heat recovery steam generator (HRSG); flowing feed water through an economizer section of the HRSG at a flow rate and providing heated feed water; flowing a first portion of the heated feed water through an evaporator section of the HRSG and producing saturated steam at a production rate, the flow rate of the feed water through the economizer section being greater than required to sustain the production rate of steam in the evaporator section; flowing fuel for the turbine through a heat exchanger; and, flowing a second portion of the heated feed water provided by the economizer section through the heat exchanger then to an inlet of the economizer section, thereby heating the fuel flowing through the heat exchanger.

  10. Power law and composite power law friction factor correlations for laminar and turbulent gasliquid

    E-Print Network [OSTI]

    Joseph, Daniel D.

    new unpublished, and data for gas and heavy oil from PDVSA-Intevep. Dimensionless pressure gradients oil are compiled and processed for power law and composite power law friction factor correlations reduce to the power laws for laminar flow when the Reynolds number is low and to turbulent flow when

  11. Uncertain Power Flows and Transmission Planning

    E-Print Network [OSTI]

    ). PSERC is a multi-university Center conducting research on challenges facing a restructuring electric For information about this project contact: Gerald T. Heydt Arizona State University Department of Electrical University of Illinois at Urbana-Champaign Department of Electrical and Computer Engineering 1406 W. Green St

  12. MATPOWER's Extensible Optimal Power Flow Architecture

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    's and LODF's) and for running OPF-based auction markets. The initial motivation for the development platform used to test electricity markets. It requires a "smart market" auction clearing software that uses Technology Solutions and the Office of Electricity Delivery and Energy Reliability, Transmission Reliability

  13. Performance mapping studies in Redox flow cells

    SciTech Connect (OSTI)

    Hoberecht, M.A.; Thaller, L.H.

    1981-09-01

    Pumping power requirements in any flow battery system constitute a direct parasitic energy loss. It is therefore useful to determine the practical lower limit for reactant flow rates. Through the use of a theoretical framework based on electrochemical first principles, two different experimental flow mapping techniques are developed to evaluate and compare electrodes as a function of flow rate. For the carbon felt electrodes presently used in NASA-Lewis Redox cells, a flow rate 1.5 times greater than the stoichiometric rate seems to be the required minimum.

  14. Self-regulating flow control device

    DOE Patents [OSTI]

    Humphreys, Duane A. (Pittsburgh, PA)

    1984-01-01

    A variable, self-regulating valve having a hydraulic loss coefficient proportional to a positive exponential power of the flow rate. The device includes two objects in a flow channel and structure which assures that the distance between the two objects is an increasing function of the flow rate. The range of spacing between the objects is such that the hydraulic resistance of the valve is an increasing function of the distance between the two objects so that the desired hydraulic loss coefficient as a function of flow rate is obtained without variation in the flow area.

  15. Flow cytometer

    DOE Patents [OSTI]

    Van den Engh, G.

    1995-11-07

    A Faraday cage is described which encloses the flow chamber of a cytometer. Ground planes associated with each field deflection plate inhibit electric fields from varying the charge on designated events/droplets and further concentrates. They also increase forces applied to a passing charged event for accurate focus while concomitantly inhibiting a potential shock hazard. 4 figs.

  16. Some questions regarding the understanding and prediction of turbulent flow

    E-Print Network [OSTI]

    Heinz, Stefan

    generation by thermal power, passenger and cargo service by automobiles, airplanes, or ships, manufacturing more com- petitive industrial processes involving fluid flows. Internal combustion engine, energy

  17. Superconducting flux flow digital circuits

    DOE Patents [OSTI]

    Hietala, V.M.; Martens, J.S.; Zipperian, T.E.

    1995-02-14

    A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs) are disclosed. Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics. 8 figs.

  18. Superconducting flux flow digital circuits

    DOE Patents [OSTI]

    Hietala, Vincent M. (Placitas, NM); Martens, Jon S. (Sunnyvale, CA); Zipperian, Thomas E. (Albuquerque, NM)

    1995-01-01

    A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs). Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics.

  19. Distributed Energy Management for Electric Power Systems

    E-Print Network [OSTI]

    Distributed Energy Management for Electric Power Systems Gabriela Hug, ghug@ece.cmu.edu Soummya Kar Theory Power flow control Consensus + Innovation Approach Theory Energy Management Conclusions 2 #12 line flows Tertiary Control => Energy Energy source scheduling including generator and storage

  20. Understanding order flow

    E-Print Network [OSTI]

    Evans, MDD; Lyons, Richard K.

    2006-01-01

    Understanding Order Flow October 2005 Martin D. D. Evans 1Rate Fundamentals and Order Flow, typescript, Georgetown2005), Customer Order Flow and Exchange Rate Movements: Is

  1. Direct cooled power electronics substrate

    DOE Patents [OSTI]

    Wiles, Randy H [Powell, TN; Wereszczak, Andrew A [Oak Ridge, TN; Ayers, Curtis W. (Kingston, TN) [Kingston, TN; Lowe, Kirk T. (Knoxville, TN) [Knoxville, TN

    2010-09-14

    The disclosure describes directly cooling a three-dimensional, direct metallization (DM) layer in a power electronics device. To enable sufficient cooling, coolant flow channels are formed within the ceramic substrate. The direct metallization layer (typically copper) may be bonded to the ceramic substrate, and semiconductor chips (such as IGBT and diodes) may be soldered or sintered onto the direct metallization layer to form a power electronics module. Multiple modules may be attached to cooling headers that provide in-flow and out-flow of coolant through the channels in the ceramic substrate. The modules and cooling header assembly are preferably sized to fit inside the core of a toroidal shaped capacitor.

  2. LATEX TikZposter Simulation of two-phase flow for

    E-Print Network [OSTI]

    Ábrahám, Erika

    LATEX TikZposter Simulation of two-phase flow for direct steam-generating solar thermal power Aachen University Simulation of two-phase flow for direct steam-generating solar thermal power plants University Concentrating solar thermal power plants Concentrating solar thermal power (CSP) plants

  3. Nanomaterials for Fuel cells, Batteries, and Supercapacitors Flow Batteries

    E-Print Network [OSTI]

    Dutta, Indranath

    Nanomaterials for Fuel cells, Batteries, and Supercapacitors Flow Batteries 1. Shao Y, X Wang, MH storage in vanadium redox flow batteries." Journal of Power Sources 195(13):4375-4379. 2. Shao Y, MH nanotube electrodes for redox flow batteries." Electrochemistry Communications 11(10):2064-2067. doi:10

  4. Generator powered electrically heated diesel particulate filter

    DOE Patents [OSTI]

    Gonze, Eugene V; Paratore, Jr., Michael J

    2014-03-18

    A control circuit for a vehicle powertrain includes a switch that selectivity interrupts current flow between a first terminal and a second terminal. A first power source provides power to the first terminal and a second power source provides power to the second terminal and to a heater of a heated diesel particulate filter (DPF). The switch is opened during a DPF regeneration cycle to prevent the first power source from being loaded by the heater while the heater is energized.

  5. Grid Applications for Energy Storage Flow Cells for Energy Storage Workshop

    E-Print Network [OSTI]

    Storage #12;Competitive Electric Market Structure Power Generation Distributed Generation Grid Management Power Mkts. & Reliability Micro-Grids Power Quality Grid Reliability Competitive State Regulated FERCGrid Applications for Energy Storage Flow Cells for Energy Storage Workshop Washington DC 7

  6. Abstract--Although Locational Marginal Pricing (LMP) plays an important role in many restructured wholesale power

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    the performance of these markets. In this paper, different AC and DC optimal power flow (OPF) models are presented Terms-- Locational marginal pricing, wholesale power market, AC optimal power flow, DC optimal power to distinct local conditions (e.g., hydroelectric power in the northwest). Even in regions adopting the design

  7. US energy flow - 1984

    SciTech Connect (OSTI)

    Briggs, C.K.; Borg, I.Y.

    1985-07-01

    The 1984 energy flow diagram for the USA has been constructed using Department of Energy data. It is a convenient graphical device to show supply and demand as well as the size of end-use sectors. A 4% increase in overall energy consumption represented a reversal in a downward trend started in 1979. All indicators pointed to more healthy industrial and farm economies in 1984 than in the previous two years, which accounted for some part of the increase in energy use. While domestic crude oil production remained stable, oil imports rose eight percent also reversing a long-standing trend. Seventy-two million barrels of oil primarily from Mexico and the United Kingdom were added to the Strategic Petroleum Reserve bringing the total oil stored at year end to 451 million barrels. At the same time 49 million barrels of oil were produced from the government-owned Naval Petroleum Reserve No. 1 (Elk Hills, CA). Energy use in all end-use sectors grew in 1984 which is in keeping with increases in use of all types of fossil fuels as well as electricity. Increase in electrical power demand continued to exceed forecasts, and during 1984 contracts for imports to the northeast US were negotiated with Canada. Nuclear power contributed 15% of total power generated in the US. At year end there were 86 licensed reactors and 44 in either start-up or construction stages. Six were canceled or abandoned during construction during the year. 11 refs., 4 figs., 3 tabs.

  8. Flow Coefficient

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverse (Journal Article) |Final ReporttheHouseNewFlippingGrossThousandperNumerical

  9. A System-Level Analysis of a Wireless Low-Power Biosignal Recording Device

    E-Print Network [OSTI]

    Chandler, Rodney James

    2012-01-01

    switching activity estimates for the design. These estimates were then annotated into the synthesis flow to obtain power

  10. Perovskite Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Perovskite Power 1663 Los Alamos science and technology magazine Latest Issue:October 2015 past issues All Issues submit Perovskite Power A breakthrough in the production of...

  11. Reactive power compensator

    DOE Patents [OSTI]

    El-Sharkawi, Mohamed A. (Renton, WA); Venkata, Subrahmanyam S. (Woodinville, WA); Chen, Mingliang (Kirkland, WA); Andexler, George (Everett, WA); Huang, Tony (Seattle, WA)

    1992-01-01

    A system and method for determining and providing reactive power compensation for an inductive load. A reactive power compensator (50,50') monitors the voltage and current flowing through each of three distribution lines (52a, 52b, 52c), which are supplying three-phase power to one or more inductive loads. Using signals indicative of the current on each of these lines when the voltage waveform on the line crosses zero, the reactive power compensator determines a reactive power compensator capacitance that must be connected to the lines to maintain a desired VAR level, power factor, or line voltage. Alternatively, an operator can manually select a specific capacitance for connection to each line, or the capacitance can be selected based on a time schedule. The reactive power compensator produces control signals, which are coupled through optical fibers (102/106) to a switch driver (110, 110') to select specific compensation capacitors (112) for connections to each line. The switch driver develops triggering signals that are supplied to a plurality of series-connected solid state switches (350), which control charge current in one direction in respect to ground for each compensation capacitor. During each cycle, current flows from ground to charge the capacitors as the voltage on the line begins to go negative from its positive peak value. The triggering signals are applied to gate the solid state switches into a conducting state when the potential on the lines and on the capacitors reaches a negative peak value, thereby minimizing both the potential difference and across the charge current through the switches when they begin to conduct. Any harmonic distortion on the potential and current carried by the lines is filtered out from the current and potential signals used by the reactive power compensator so that it does not affect the determination of the required reactive compensation.

  12. Reactive Power Compensator.

    DOE Patents [OSTI]

    El-Sharkawi, M.A.; Venkata, S.S.; Chen, M.; Andexler, G.; Huang, T.

    1992-07-28

    A system and method for determining and providing reactive power compensation for an inductive load. A reactive power compensator (50,50') monitors the voltage and current flowing through each of three distribution lines (52a, 52b, 52c), which are supplying three-phase power to one or more inductive loads. Using signals indicative of the current on each of these lines when the voltage waveform on the line crosses zero, the reactive power compensator determines a reactive power compensator capacitance that must be connected to the lines to maintain a desired VAR level, power factor, or line voltage. Alternatively, an operator can manually select a specific capacitance for connection to each line, or the capacitance can be selected based on a time schedule. The reactive power compensator produces control signals, which are coupled through optical fibers (102/106) to a switch driver (110, 110') to select specific compensation capacitors (112) for connections to each line. The switch driver develops triggering signals that are supplied to a plurality of series-connected solid state switches (350), which control charge current in one direction in respect to ground for each compensation capacitor. During each cycle, current flows from ground to charge the capacitors as the voltage on the line begins to go negative from its positive peak value. The triggering signals are applied to gate the solid state switches into a conducting state when the potential on the lines and on the capacitors reaches a negative peak value, thereby minimizing both the potential difference and across the charge current through the switches when they begin to conduct. Any harmonic distortion on the potential and current carried by the lines is filtered out from the current and potential signals used by the reactive power compensator so that it does not affect the determination of the required reactive compensation. 26 figs.

  13. Power electronics cooling apparatus

    DOE Patents [OSTI]

    Sanger, Philip Albert (Monroeville, PA); Lindberg, Frank A. (Baltimore, MD); Garcen, Walter (Glen Burnie, MD)

    2000-01-01

    A semiconductor cooling arrangement wherein a semiconductor is affixed to a thermally and electrically conducting carrier such as by brazing. The coefficient of thermal expansion of the semiconductor and carrier are closely matched to one another so that during operation they will not be overstressed mechanically due to thermal cycling. Electrical connection is made to the semiconductor and carrier, and a porous metal heat exchanger is thermally connected to the carrier. The heat exchanger is positioned within an electrically insulating cooling assembly having cooling oil flowing therethrough. The arrangement is particularly well adapted for the cooling of high power switching elements in a power bridge.

  14. Propeller Flow Meter 

    E-Print Network [OSTI]

    Enciso, Juan; Santistevan, Dean; Hla, Aung K.

    2007-10-01

    Propeller flow meters are commonly used to measure water flow rate. They can also be used to estimate irrigation water use. This publication explains how to select, install, read and maintain propeller flow meters....

  15. Bacteria in shear flow

    E-Print Network [OSTI]

    Marcos, Ph.D. Massachusetts Institute of Technology

    2011-01-01

    Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent ...

  16. Dispersed flow film boiling

    E-Print Network [OSTI]

    Yoder, Graydon L.

    1980-01-01

    Dispersed flow consists of small liquid droplets entrained in a flowing vapor. This flow regime can occur in cryogenic equipment, in steam generators, and during nuclear reactor loss of coolant accidents. A theoretical ...

  17. Vehicle Technologies Office: Power Electronics Research and Developmen...

    Office of Environmental Management (EM)

    drive vehicles. Vehicle power electronics primarily process and control the flow of electrical energy in hybrid and plug-in electric vehicles, including plug-in electric vehicles....

  18. FLOW-THROUGH POROUS ELECTRODES

    E-Print Network [OSTI]

    Trainham, III, James Arthur

    2011-01-01

    configurations for flow redox battery applications: (i) theporous electrodes A flow-redox battery using flow-by poroustrue in battery applications, Flow..through porous

  19. High energy density redox flow device

    DOE Patents [OSTI]

    Chiang, Yet-Ming; Carter, W. Craig; Ho, Bryan Y; Duduta, Mihai; Limthongkul, Pimpa

    2014-05-13

    Redox flow devices are described in which at least one of the positive electrode or negative electrode-active materials is a semi-solid or is a condensed ion-storing electroactive material, and in which at least one of the electrode-active materials is transported to and from an assembly at which the electrochemical reaction occurs, producing electrical energy. The electronic conductivity of the semi-solid is increased by the addition of conductive particles to suspensions and/or via the surface modification of the solid in semi-solids (e.g., by coating the solid with a more electron conductive coating material to increase the power of the device). High energy density and high power redox flow devices are disclosed. The redox flow devices described herein can also include one or more inventive design features. In addition, inventive chemistries for use in redox flow devices are also described.

  20. Multiphase flow calculation software

    DOE Patents [OSTI]

    Fincke, James R. (Idaho Falls, ID)

    2003-04-15

    Multiphase flow calculation software and computer-readable media carrying computer executable instructions for calculating liquid and gas phase mass flow rates of high void fraction multiphase flows. The multiphase flow calculation software employs various given, or experimentally determined, parameters in conjunction with a plurality of pressure differentials of a multiphase flow, preferably supplied by a differential pressure flowmeter or the like, to determine liquid and gas phase mass flow rates of the high void fraction multiphase flows. Embodiments of the multiphase flow calculation software are suitable for use in a variety of applications, including real-time management and control of an object system.

  1. A Tariff for Reactive Power

    SciTech Connect (OSTI)

    Kueck, John D; Kirby, Brendan J; Li, Fangxing; Tufon, Christopher; Isemonger, Alan

    2008-07-01

    Two kinds of power are required to operate an electric power system: real power, measured in watts, and reactive power, measured in volt-amperes reactive or VARs. Reactive power supply is one of a class of power system reliability services collectively known as ancillary services, and is essential for the reliable operation of the bulk power system. Reactive power flows when current leads or lags behind voltage. Typically, the current in a distribution system lags behind voltage because of inductive loads such as motors. Reactive power flow wastes energy and capacity and causes voltage droop. To correct lagging power flow, leading reactive power (current leading voltage) is supplied to bring the current into phase with voltage. When the current is in phase with voltage, there is a reduction in system losses, an increase in system capacity, and a rise in voltage. Reactive power can be supplied from either static or dynamic VAR sources. Static sources are typically transmission and distribution equipment, such as capacitors at substations, and their cost has historically been included in the revenue requirement of the transmission operator (TO), and recovered through cost-of-service rates. By contrast, dynamic sources are typically generators capable of producing variable levels of reactive power by automatically controlling the generator to regulate voltage. Transmission system devices such as synchronous condensers can also provide dynamic reactive power. A class of solid state devices (called flexible AC transmission system devices or FACTs) can provide dynamic reactive power. One specific device has the unfortunate name of static VAR compensator (SVC), where 'static' refers to the solid state nature of the device (it does not include rotating equipment) and not to the production of static reactive power. Dynamic sources at the distribution level, while more costly would be very useful in helping to regulate local voltage. Local voltage regulation would reduce system losses, increase circuit capacity, increase reliability, and improve efficiency. Reactive power is theoretically available from any inverter-based equipment such as photovoltaic (PV) systems, fuel cells, microturbines, and adjustable-speed drives. However, the installation is usually only economical if reactive power supply is considered during the design and construction phase. In this report, we find that if the inverters of PV systems or the generators of combined heat and power (CHP) systems were designed with capability to supply dynamic reactive power, they could do this quite economically. In fact, on an annualized basis, these inverters and generators may be able to supply dynamic reactive power for about $5 or $6 per kVAR. The savings from the local supply of dynamic reactive power would be in reduced losses, increased capacity, and decreased transmission congestion. The net savings are estimated to be about $7 per kVAR on an annualized basis for a hypothetical circuit. Thus the distribution company could economically purchase a dynamic reactive power service from customers for perhaps $6/kVAR. This practice would provide for better voltage regulation in the distribution system and would provide an alternate revenue source to help amortize the cost of PV and CHP installations. As distribution and transmission systems are operated under rising levels of stress, the value of local dynamic reactive supply is expected to grow. Also, large power inverters, in the range of 500 kW to 1 MW, are expected to decrease in cost as they become mass produced. This report provides one data point which shows that the local supply of dynamic reactive power is marginally profitable at present for a hypothetical circuit. We expect that the trends of growing power flow on the existing system and mass production of inverters for distributed energy devices will make the dynamic supply of reactive power from customers an integral component of economical and reliable system operation in the future.

  2. Flow Distances on Open Flow Networks

    E-Print Network [OSTI]

    Guo, Liangzhu; Shi, Peiteng; Wang, Jun; Huang, Xiaohan; Zhang, Jiang

    2015-01-01

    Open flow network is a weighted directed graph with a source and a sink, depicting flux distributions on networks in the steady state of an open flow system. Energetic food webs, economic input-output networks, and international trade networks, are open flow network models of energy flows between species, money or value flows between industrial sectors, and goods flows between countries, respectively. Flow distances (first-passage or total) between any given two nodes $i$ and $j$ are defined as the average number of transition steps of a random walker along the network from $i$ to $j$ under some conditions. They apparently deviate from the conventional random walk distance on a closed directed graph because they consider the openness of the flow network. Flow distances are explicitly expressed by underlying Markov matrix of a flow system in this paper. With this novel theoretical conception, we can visualize open flow networks, calculating centrality of each node, and clustering nodes into groups. We apply fl...

  3. Flow Classification by Histograms or How to Go on Safari in the Internet

    E-Print Network [OSTI]

    Emilion, Richard

    Flow Classification by Histograms or How to Go on Safari in the Internet Augustin Soule , Kavé aggregated Internet traffic flows efficiently, we need to be able to categorize flows into distinct classes method for Internet flow classification. We show that our method is powerful in that it is capable

  4. Radiation beam calorimetric power measurement system

    DOE Patents [OSTI]

    Baker, John (Livermore, CA); Collins, Leland F. (Pleasanton, CA); Kuklo, Thomas C. (Ripon, CA); Micali, James V. (Dublin, CA)

    1992-01-01

    A radiation beam calorimetric power measurement system for measuring the average power of a beam such as a laser beam, including a calorimeter configured to operate over a wide range of coolant flow rates and being cooled by continuously flowing coolant for absorbing light from a laser beam to convert the laser beam energy into heat. The system further includes a flow meter for measuring the coolant flow in the calorimeter and a pair of thermistors for measuring the temperature difference between the coolant inputs and outputs to the calorimeter. The system also includes a microprocessor for processing the measured coolant flow rate and the measured temperature difference to determine the average power of the laser beam.

  5. Flow transitions in two-dimensional foams

    E-Print Network [OSTI]

    Christopher Gilbreth; Scott Sullivan; Michael Dennin

    2006-08-08

    For sufficiently slow rates of strain, flowing foam can exhibit inhomogeneous flows. The nature of these flows is an area of active study in both two-dimensional model foams and three dimensional foam. Recent work in three-dimensional foam has identified three distinct regimes of flow [S. Rodts, J. C. Baudez, and P. Coussot, Europhys. Lett. {\\bf 69}, 636 (2005)]. Two of these regimes are identified with continuum behavior (full flow and shear-banding), and the third regime is identified as a discrete regime exhibiting extreme localization. In this paper, the discrete regime is studied in more detail using a model two dimensional foam: a bubble raft. We characterize the behavior of the bubble raft subjected to a constant rate of strain as a function of time, system size, and applied rate of strain. We observe localized flow that is consistent with the coexistence of a power-law fluid with rigid body rotation. As a function of applied rate of strain, there is a transition from a continuum description of the flow to discrete flow when the thickness of the flow region is approximately 10 bubbles. This occurs at an applied rotation rate of approximately $0.07 {\\rm s^{-1}}$.

  6. Nuclear-Coupled Flow Instabilities and Their Effects on Dryout

    SciTech Connect (OSTI)

    M. Ishii; X. Sunn; S. Kuran

    2004-09-27

    Nuclear-coupled flow/power oscillations in boiling water reactors (BWRs) are investigated experimentally and analytically. A detailed literature survey is performed to identify and classify instabilities in two-phase flow systems. The classification and the identification of the leading physical mechanisms of the two-phase flow instabilities are important to propose appropriate analytical models and scaling criteria for simulation. For the purpose of scaling and the analysis of the nonlinear aspects of the coupled flow/power oscillations, an extensive analytical modeling strategy is developed and used to derive both frequency and time domain analysis tools.

  7. Ionization based multi-directional flow sensor

    DOE Patents [OSTI]

    Chorpening, Benjamin T. (Morgantown, WV); Casleton, Kent H. (Morgantown, WV)

    2009-04-28

    A method, system, and apparatus for conducting real-time monitoring of flow (airflow for example) in a system (a hybrid power generation system for example) is disclosed. The method, system and apparatus measure at least flow direction and velocity with minimal pressure drop and fast response. The apparatus comprises an ion source and a multi-directional collection device proximate the ion source. The ion source is configured to generate charged species (electrons and ions for example). The multi-directional collection source is configured to determine the direction and velocity of the flow in real-time.

  8. Redox Flow Batteries: An Engineering Perspective

    SciTech Connect (OSTI)

    Chalamala, Babu R.; Soundappan, Thiagarajan; Fisher, Graham R.; Anstey, Mitchell A.; Viswanathan, Vilayanur V.; Perry, Mike L.

    2014-10-01

    Redox flow batteries are well suited to provide modular and scalable energy storage systems for a wide range of energy storage applications. In this paper, we review the development of redox flow battery technology including recent advances in new redox active materials and systems. We discuss cost, performance, and reliability metrics that are critical for deployment of large flow battery systems. The technology, while relatively young, has the potential for significant improvement through reduced materials costs, improved energy and power efficiency, and significant reduction in the overall system cost.

  9. Experimental characterisation of bubbly flow using MRI

    E-Print Network [OSTI]

    Tayler, Alexander B.

    2011-11-08

    and industry. Known as gas-liquid flows, these systems occur in situations as diverse as the bow wave of a ship to the cooling system in a nuclear power plant. The structure of a gas-liquid flow depends upon the relative flow-rates of the two phases, and... . [3] Deckwer, W.D., 1985. Bubble column reactors. Wiley, Chichester. [4] Jacobsen, H.A., 2008. Chemical reactor modeling. Springer-Verlag, Berlin. [5] Saxena, S.C., Patel, D., Smith, D.N. and Ruether, J.A., 1988. An assessment of experimental...

  10. Power Electronics Thermal Control (Presentation)

    SciTech Connect (OSTI)

    Narumanchi, S.

    2010-05-05

    Thermal management plays an important part in the cost of electric drives in terms of power electronics packaging. Very promising results have been obtained by using microporous coatings and skived surfaces in conjunction with single-phase and two-phase flows. Sintered materials and thermoplastics with embedded fibers show significant promise as thermal interface materials, or TIMs. Appropriate cooling technologies depend on the power electronics package application and reliability.

  11. Portable wastewater flow meter

    DOE Patents [OSTI]

    Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)

    1999-02-02

    A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under fill pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.

  12. Portable wastewater flow meter

    DOE Patents [OSTI]

    Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)

    1990-01-01

    A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under full pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.

  13. Power supply

    DOE Patents [OSTI]

    Yakymyshyn, Christopher Paul (Seminole, FL); Hamilton, Pamela Jane (Seminole, FL); Brubaker, Michael Allen (Loveland, CO)

    2007-12-04

    A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and delivered power.

  14. Energy and the Evolution of World-Systems: Fueling Power and Environmental Degradation, 1800-2008

    E-Print Network [OSTI]

    Lawrence, Kirk Steven

    2011-01-01

    between power and energy flows in the interstate system isthe effects of energy, power, and world-system position onPower, and Energy Control and Transformation in the World-System………

  15. Soluble Lead Flow Battery: Soluble Lead Flow Battery Technology

    SciTech Connect (OSTI)

    2010-09-01

    GRIDS Project: General Atomics is developing a flow battery technology based on chemistry similar to that used in the traditional lead-acid battery found in nearly every car on the road today. Flow batteries store energy in chemicals that are held in tanks outside the battery. When the energy is needed, the chemicals are pumped through the battery. Using the same basic chemistry as a traditional battery but storing its energy outside of the cell allows for the use of very low cost materials. The goal is to develop a system that is far more durable than today’s lead-acid batteries, can be scaled to deliver megawatts of power, and which lowers the cost of energy storage below $100 per kilowatt hour.

  16. Columbia University flow instability experimental program: Volume 3. Single tube parallel flow tests

    SciTech Connect (OSTI)

    Dougherty, T.; Maciuca, C.; McAssey, E.V. Jr.; Reddy, D.G.; Yang, B.W.

    1990-06-01

    The coolant in the Savannah River Site (SRS) production nuclear reactor assemblies is circulated as a subcooled liquid under normal operating conditions. This coolant is evenly distributed throughout multiple annular flow channels with a uniform pressure profile across each coolant flow channel. During the postulated Loss of Coolant Accident (LOCA), which is initiated by a hypothetical guillotine pipe break, the coolant flow through the reactor assemblies is significantly reduced. The flow reduction and accompanying power reduction (after shutdown is initiated) occur in the first 1--2 seconds of the LOCA. This portion of the LOCA is referred to as the Flow Instability phase. A series of down flow experiments have been conducted on three different size single tubes. The objective of these experiments was to determine the effect of a parallel flow path on the occurrence of flow instability. In all cases, it has been shown that the point of flow instability (OFI) determined under controlled flow operation does not change when operating in a controlled pressure drop mode (parallel path operation).

  17. GEOTHERMAL POWER GENERATION PLANT

    SciTech Connect (OSTI)

    Boyd, Tonya

    2013-12-01

    Oregon Institute of Technology (OIT) drilled a deep geothermal well on campus (to 5,300 feet deep) which produced 196oF resource as part of the 2008 OIT Congressionally Directed Project. OIT will construct a geothermal power plant (estimated at 1.75 MWe gross output). The plant would provide 50 to 75 percent of the electricity demand on campus. Technical support for construction and operations will be provided by OIT’s Geo-Heat Center. The power plant will be housed adjacent to the existing heat exchange building on the south east corner of campus near the existing geothermal production wells used for heating campus. Cooling water will be supplied from the nearby cold water wells to a cooling tower or air cooling may be used, depending upon the type of plant selected. Using the flow obtained from the deep well, not only can energy be generated from the power plant, but the “waste” water will also be used to supplement space heating on campus. A pipeline will be construction from the well to the heat exchanger building, and then a discharge line will be construction around the east and north side of campus for anticipated use of the “waste” water by facilities in an adjacent sustainable energy park. An injection well will need to be drilled to handle the flow, as the campus existing injection wells are limited in capacity.

  18. Smoothing the Flow of Renewable Solar Energy in California's...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Energy in California's Central Valley May 23, 2014 - 3:21pm Addthis This EnerVault flow battery stores power from the solar panels and releases it as needed. | Photo courtesy of...

  19. Dissecting the pressure field in tidal flow

    E-Print Network [OSTI]

    amplitude [N x 107 ] phase relative to the velocity [deg] power [W x107 ] 1 2 3 4 tidal excursion parameterDissecting the pressure field in tidal flow past a headland: When is form drag "real?" Sally Warner waves eddies H L LHH H L L LH #12;Numerical model Gaussian-shaped headland Barotropic tidal velocity D L

  20. Power LCAT

    SciTech Connect (OSTI)

    Drennen, Thomas

    2012-08-15

    POWER LCAT is a software tool used to compare elements of efficiency, cost, and environmental effects between different sources of energy.

  1. QM Power

    Broader source: Energy.gov [DOE]

    QM Power’s Q-Sync™ is an innovative, highly efficient and cost effective motor technology. Utilizing DoE SBIR funding, QM Power has developed advanced Q-Sync fan motor technology for 9-12 watt commercial refrigeration fan applications and is launching its first product lines targeting both new and existing commercial refrigeration equipment. For this project, QM Power will team with Oak Ridge National Labs, market leading OEMs, subject matter experts, end users, retrofit contractors and utilities to install and demonstrate approximately 10,000 high efficiency Q-Sync fan motors in over 50 grocery sites throughout the US.

  2. Power LCAT

    ScienceCinema (OSTI)

    Drennen, Thomas

    2014-06-27

    POWER LCAT is a software tool used to compare elements of efficiency, cost, and environmental effects between different sources of energy.

  3. Flow Field Flow Fractionation Method Development for Applied Bioanalysis

    E-Print Network [OSTI]

    Schachermeyer, Samantha Lynn

    2013-01-01

    E. ; Caldwell, K. , Field-Flow Fractionation Handbook. JohnJ. P. , Sedimentation field-flow-fractionation: emergence ofby sedimentation field-flow fractionation. Am. Lab. (

  4. Engineering design factors in flowing electrolyte bipolar batteries

    SciTech Connect (OSTI)

    Grimes, P.; Bellows, R.; Malachesky, P.

    1984-08-01

    Flowing electrolyte bipolar batteries allow a system designer great flexibility in fitting the batteries to applications. A mathematical model has been developed describing flow battery characteristics to aid the designer. This model can be used to compute the interrelationships of power, energy, volume, number of cells, cell area, capacity, weight, etc. Examples from zinc bromine battery systems are given.

  5. Phase appearance or disappearance in two-phase flows

    E-Print Network [OSTI]

    Boyer, Edmond

    safety studies. In nuclear reactors, the appearance of vapor around the fuel rods interferes-phase flows. Such models have crucial importance in many industrial areas such as nuclear power plant safety in a large variety of industrial or natural systems involving boiling or condensing fluids, reacting flows

  6. REAL TIME FEATURE EXTRACTION FOR THE ANALYSIS OF TURBULENT FLOWS

    E-Print Network [OSTI]

    Interrante, Victoria

    great unsolved problem in classical physics, and all efforts to develop models to predict turbulent techniques, terabyte scale data sets are being generated, and hence stor- age as well as analysis include flow over aircraft, spacecraft, and other transport vehicles, flow inside of engines and power

  7. Using Flow Batteries for Energy Storage Moses Sutton, Columbia University

    E-Print Network [OSTI]

    Lavaei, Javad

    1 Using Flow Batteries for Energy Storage Moses Sutton, Columbia University mss2197@columbia.edu Abstract - In the industry of power generation and distribution, effective energy storage devices have long that are gaining attention in the energy storage industry. I. Introduction Flow batteries are rechargeable

  8. Ultrasonic flow metering system

    DOE Patents [OSTI]

    Gomm, Tyler J. (Meridian, ID); Kraft, Nancy C. (Idaho Falls, ID); Mauseth, Jason A. (Pocatello, ID); Phelps, Larry D. (Pocatello, ID); Taylor, Steven C. (Idaho Falls, ID)

    2002-01-01

    A system for determining the density, flow velocity, and mass flow of a fluid comprising at least one sing-around circuit that determines the velocity of a signal in the fluid and that is correlatable to a database for the fluid. A system for determining flow velocity uses two of the inventive circuits with directional transmitters and receivers, one of which is set at an angle to the direction of flow that is different from the others.

  9. Elbow mass flow meter

    DOE Patents [OSTI]

    McFarland, Andrew R. (College Station, TX); Rodgers, John C. (Santa Fe, NM); Ortiz, Carlos A. (Bryan, TX); Nelson, David C. (Santa Fe, NM)

    1994-01-01

    Elbow mass flow meter. The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity.

  10. Oscillating fluid power generator

    DOE Patents [OSTI]

    Morris, David C

    2014-02-25

    A system and method for harvesting the kinetic energy of a fluid flow for power generation with a vertically oriented, aerodynamic wing structure comprising one or more airfoil elements pivotably attached to a mast. When activated by the moving fluid stream, the wing structure oscillates back and forth, generating lift first in one direction then in the opposite direction. This oscillating movement is converted to unidirectional rotational movement in order to provide motive power to an electricity generator. Unlike other oscillating devices, this device is designed to harvest the maximum aerodynamic lift forces available for a given oscillation cycle. Because the system is not subjected to the same intense forces and stresses as turbine systems, it can be constructed less expensively, reducing the cost of electricity generation. The system can be grouped in more compact clusters, be less evident in the landscape, and present reduced risk to avian species.

  11. FLOW-THROUGH POROUS ELECTRODES

    E-Print Network [OSTI]

    Trainham, III, James Arthur

    2011-01-01

    Wilhelm. HBoundary conditions of a flow reactor. 1i Chemicala Packed-Bed Electrochemical Flow Reactor." Journal ofRichard, and Brian Gracon. "Flow-Through Porous Electrodes."

  12. Redox Flow Batteries, a Review

    E-Print Network [OSTI]

    Weber, Adam Z.

    2013-01-01

    Ltd." . Http://Plurionsystems.Com/Tech_Flow_Advantages.Html.plurionsystems.com/tech_flow_advantages.html [71] P. Leung,High Energy Density Redox Flow Device," ed: WO Patent

  13. Power system

    DOE Patents [OSTI]

    Hickam, Christopher Dale (Glasford, IL)

    2008-03-18

    A power system includes a prime mover, a transmission, and a fluid coupler having a selectively engageable lockup clutch. The fluid coupler may be drivingly connected between the prime mover and the transmission. Additionally, the power system may include a motor/generator drivingly connected to at least one of the prime mover and the transmission. The power-system may also include power-system controls configured to execute a control method. The control method may include selecting one of a plurality of modes of operation of the power system. Additionally, the control method may include controlling the operating state of the lockup clutch dependent upon the mode of operation selected. The control method may also include controlling the operating state of the motor/generator dependent upon the mode of operation selected.

  14. High power RF systems for the BNL ERL project

    SciTech Connect (OSTI)

    Zaltsman, A.; Lambiase, R.

    2011-03-28

    The Energy Recovery Linac (ERL) project, now under construction at Brookhaven National Laboratory, requires two high power RF systems. The first RF system is for the 703.75 MHz superconducting electron gun. The RF power from this system is used to drive nearly half an Ampere of beam current to 2 MeV. There is no provision to recover any of this energy so the minimum amplifier power is 1 MW. It consists of 1 MW CW klystron, transmitter and power supplies, 1 MW circulator, 1 MW dummy load and a two-way power splitter. The second RF system is for the 703.75 MHz superconducting cavity. The system accelerates the beam to 54.7 MeV and recovers this energy. It will provide up to 50 kW of CW RF power to the cavity. It consists of 50 kW transmitter, circulator, and dummy load. This paper describes the two high power RF systems and presents the test data for both.

  15. Commitment is a Two-Way Street: Toyota, California and NUMMI

    E-Print Network [OSTI]

    Shaiken, Harley

    2010-01-01

    www.autonews.com/section/datacenter Ward’s Motor Vehiclewww.autonews.com/section/datacenter California New Carwww.autonews.com/section/datacenter U.S. Census Bureau, U.S.

  16. Exploring Parental Attitudes and Experiences in Korean-English Two-Way Immersion Programs

    E-Print Network [OSTI]

    Ee, Jongyeon

    2015-01-01

    River, New Jersey: Pearson Education International. Allport,1979). Reproduction in education, society, and culture (2 ndCenter for research on education, diversity and excellence.

  17. Standing waves for a two-way model system for water waves

    E-Print Network [OSTI]

    2004-10-18

    Sep 12, 2004 ... that, contrary to the classical standing gravity wave problem on a fluid .... The standing waves we are looking for are solutions (?, u) doubly ...

  18. Commitment is a Two-Way Street: Toyota, California and NUMMI

    E-Print Network [OSTI]

    Shaiken, Harley

    2010-01-01

    California’s Automotive Industry: Maintaining AutomotiveCalifornia’s Automotive Industry. ” “This region includesCalifornia’s Automotive Industry: Maintaining Automotive

  19. Coding Schemes for Physical Layer Network Coding Over a Two-Way Relay Channel 

    E-Print Network [OSTI]

    Hern, Brett Michael

    2013-08-09

    MLC scheme. : : : : : : : : : : : : : : : : : : : : 36 6 ?Rf (hA; hB) vs. for each function f 2 F with the proposed coding scheme using CF decoding. : : : : : : : : : : : : : : : : : : : 37 7 I(YR; f(XA; XB)) vs. for each linear function f 2 FGF... for the proposed scheme with 4-qam when hA = 1 as a function of hB. : : : : : : : : : : : : : : : : : : : : : : : : : : 42 10 Outage experiment results with 4-qam signalling. : : : : : : : : : : : 45 11 Outage experiment results with 4-qam signalling. Proposed...

  20. An evaluation of supplemental signing at two-way stop-controlled intersections 

    E-Print Network [OSTI]

    Schuckel, Clint Edwin

    1996-01-01

    NOT STOP." The objective of this thesis was to investigate the effectiveness of these signs in reducing conflicts and accidents at TWSC intersections. Traffic conflict and accident data were obtained for six TWSC intersections in Texas; three locations...

  1. Alternating Two-Way AC-Tree Automata Kumar Neeraj Verma 1,

    E-Print Network [OSTI]

    Doyen, Laurent

    Partially supported by the ACI VERNAM, the RNTL project EVA, the RNTL project Prouvé, and the ACI jeunes in hardware or soft- ware verification (Jouannaud, 1995). We may enrich standard tree automata with various

  2. Commitment is a Two-Way Street: Toyota, California and NUMMI

    E-Print Network [OSTI]

    Shaiken, Harley

    2010-01-01

    Room D. “Toyota moving Tacoma production to San Antonio,”NUMMI today—the Corolla and Tacoma compact pickup—will rollMoving Corolla and some Tacoma production offshore would

  3. The intersection of religion and politics : a two-way street

    E-Print Network [OSTI]

    Margolis, Michele F. (Michele Francine)

    2014-01-01

    My dissertation reexamines the relationship between religious and political attitudes and challenges the conventional wisdom that religious identities are impervious to politics' influence. I not only identify the conditions ...

  4. CONSTRUCTION OF WRF/CAM TWO-WAY COUPLING SYSTEM AND PRELIMINARY RESULTS

    E-Print Network [OSTI]

    /Atmospheric Sciences Division Brookhaven National Laboratory U.S. Department of Energy Office of Science ABSTRACT A WRF Associates, LLC under Contract No. DE-AC02- 98CH10886 with the U.S. Department of Energy. The publisher-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript

  5. Two-Way Integration of WRF and CCSM for Regional Climate Simulations...

    Office of Scientific and Technical Information (OSTI)

    the process of dynamical downscaling by avoiding massive intermediate model outputs at high frequency that are typically required for offline regional downscaling. The inline...

  6. A combined field approach for the two-way coupling problem in the liquid evaporation

    E-Print Network [OSTI]

    Xuefeng Xu

    2014-11-23

    During liquid evaporation, the temperature of the liquid determines the saturated vapor pressure above it, which controls the evaporation rate and thus determines the liquid temperature through latent heat. Therefore, the equations for the vapor concentration in the atmosphere and for the temperature in the liquid are coupled and must be solved in an iterative manner. In the present paper, a combined field approach which unifies the coupled fields into one single field and thus makes the iteration unnecessary is proposed. The present work will be useful in scientific and industrial processes involving liquid evaporation and may also have more general applications to coupled field problems in which all the fields have the same governing equation.

  7. Quick Start Guide There are two ways to access COS Funding

    E-Print Network [OSTI]

    Ronquist, Fredrik

    search terms entered are connected by the Boolean connector OR. In addition, searches retrieve embedded are always ranked by relevancy. 1. Enter your search terms into the text box. 2. Click COS Search. Advanced, or Sponsor). 3. Enter your search terms into the boxes. Additional fields are available to enter more search

  8. Commitment is a Two-Way Street: Toyota, California and NUMMI

    E-Print Network [OSTI]

    Shaiken, Harley

    2010-01-01

    $465 Million Loan to Tesla Motors,” press release, Jan. 21,$465 Million Loan to Tesla Motors,” press release, Jan. 21,

  9. Exploring Parental Attitudes and Experiences in Korean-English Two-Way Immersion Programs

    E-Print Network [OSTI]

    Ee, Jongyeon

    2015-01-01

    Whitney Tests for Information Sources N Z Formal Networkformal network includes public sources, such as brochures, pamphlets, public meetings, and school district websites, whereas informationinformation sources for program choice, I focused on two types of networks that parents mainly obtain information from: (1) formal

  10. Two-Way Integration of WRF and CCSM for Regional Climate Simulations

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail.Theory of rare Kaon and(Conference) | SciTech ConnectConnect

  11. Lateral flow strip assay

    DOE Patents [OSTI]

    Miles, Robin R. (Danville, CA); Benett, William J. (Livermore, CA); Coleman, Matthew A. (Oakland, CA); Pearson, Francesca S. (Livermore, CA); Nasarabadi, Shanavaz L. (Livermore, CA)

    2011-03-08

    A lateral flow strip assay apparatus comprising a housing; a lateral flow strip in the housing, the lateral flow strip having a receiving portion; a sample collection unit; and a reagent reservoir. Saliva and/or buccal cells are collected from an individual using the sample collection unit. The sample collection unit is immersed in the reagent reservoir. The tip of the lateral flow strip is immersed in the reservoir and the reagent/sample mixture wicks up into the lateral flow strip to perform the assay.

  12. POWER GRID RELIABILITY AND SECURITY

    SciTech Connect (OSTI)

    Bose, Anjan; Venkatasubramanian, Vaithianathan; Hauser, Carl; Bakken, David; Anderson, David; Zhao, Chuanlin; Liu, Dong; Yang, Tao; Meng, Ming; Zhang, Lin; Ning, Jiawei; Tashman, Zaid

    2014-09-30

    This project has led to the development of a real-time simulation platform for electric power grids called Grid Simulator or GridSim for simulating the dynamic and information network interactions of large- scale power systems. The platform consists of physical models of power system components including synchronous generators, loads and control, which are simulated using a modified commercial power simulator namely Transient Stability Analysis Tool (TSAT) [1] together with data cleanup components, as well as an emulated substation level and wide-area power analysis components. The platform also includes realistic representations of communication network middleware that can emulate the real-time information flow back and forth between substations and control centers in wide-area power systems. The platform has been validated on a realistic 6000-bus model of the western American power system. The simulator GridSim developed in this project is the first of its kind in its ability to simulate real-time response of large-scale power grids, and serves as a cost effective real-time stability and control simulation platform for power industry.

  13. Low flow fume hood

    DOE Patents [OSTI]

    Bell, Geoffrey C. (Pleasant Hill, CA); Feustel, Helmut E. (Albany, CA); Dickerhoff, Darryl J. (Berkeley, CA)

    2002-01-01

    A fume hood is provided having an adequate level of safety while reducing the amount of air exhausted from the hood. A displacement flow fume hood works on the principal of a displacement flow which displaces the volume currently present in the hood using a push-pull system. The displacement flow includes a plurality of air supplies which provide fresh air, preferably having laminar flow, to the fume hood. The displacement flow fume hood also includes an air exhaust which pulls air from the work chamber in a minimally turbulent manner. As the displacement flow produces a substantially consistent and minimally turbulent flow in the hood, inconsistent flow patterns associated with contaminant escape from the hood are minimized. The displacement flow fume hood largely reduces the need to exhaust large amounts of air from the hood. It has been shown that exhaust air flow reductions of up to 70% are possible without a decrease in the hood's containment performance. The fume hood also includes a number of structural adaptations which facilitate consistent and minimally turbulent flow within a fume hood.

  14. Nuclear Power 

    E-Print Network [OSTI]

    2010-01-01

    be inherently safe and environmentally benign. These realities of today's world are among the reasons that lead to serious interest in deploying nuclear power as a sustainable energy source. Today's nuclear reactors are safe and highly efficient energy systems...

  15. POWER GRID DYNAMICS: ENHANCING POWER SYSTEM OPERATION THROUGH PRONY ANALYSIS

    SciTech Connect (OSTI)

    Ray, C.; Huang, Z.

    2007-01-01

    Prony Analysis is a technique used to decompose a signal into a series consisting of weighted complex exponentials and promises to be an effi cient way of recognizing sensitive lines during faults in power systems such as the U.S. Power grid. Positive Sequence Load Flow (PSLF) was used to simulate the performance of a simple two-area-four-generator system and the reaction of the system during a line fault. The Dynamic System Identifi cation (DSI) Toolbox was used to perform Prony analysis and use modal information to identify key transmission lines for power fl ow adjustment to improve system damping. The success of the application of Prony analysis methods to the data obtained from PSLF is reported, and the key transmission line for adjustment is identifi ed. Future work will focus on larger systems and improving the current algorithms to deal with networks such as large portions of the Western Electricity Coordinating Council (WECC) power grid.

  16. Power combiner

    DOE Patents [OSTI]

    Arnold, Mobius; Ives, Robert Lawrence

    2006-09-05

    A power combiner for the combining of symmetric and asymmetric traveling wave energy comprises a feed waveguide having an input port and a launching port, a reflector for reflecting launched wave energy, and a final waveguide for the collection and transport of launched wave energy. The power combiner has a launching port for symmetrical waves which comprises a cylindrical section coaxial to the feed waveguide, and a launching port for asymmetric waves which comprises a sawtooth rotated about a central axis.

  17. ELECTROCHEMICAL POWER FOR TRANSPORTATION

    E-Print Network [OSTI]

    Cairns, Elton J.

    2012-01-01

    130, Flow schematic for an electric vehicle battery system.37. Flow schematic for an electric vehicle battery system.

  18. On Exploiting Flow Allocation with Rate Adaptation for Green Networking

    E-Print Network [OSTI]

    Tang, Jian "Neil"

    proposed for the MF-RAP provide close-to-optimal solutions. Index Terms--Green networking, power efficiency is known to have a negative impact on global climate. Therefore, green (power efficient) networking hasOn Exploiting Flow Allocation with Rate Adaptation for Green Networking Jian Tang, Brendan Mumey

  19. Pipe Flow System Holly Guest

    E-Print Network [OSTI]

    Clement, Prabhakar

    Pipe Flow System Design Holly Guest #12;Problem · An engineer is asked to compute the flow rate · Flow type: Turbulent or Laminar flow · Flow rate · Frictional head loss · Optimal diameters if a pump · = - ( . + . ) · f = friction factor · = relative roughness = · = Reynolds Number = · Laminar flow: 2000

  20. Flow patterns in vertical two-phase flow

    SciTech Connect (OSTI)

    McQuillan, K.W.; Whalley, P.B.

    1985-03-01

    This paper is concerned with the flow patterns which occur in upwards gas-liquid two-phase flow in vertical tubes. The basic flow patterns are described and the use of flow patter maps is discussed. The transition between plug flow and churn flow is modelled under the assumption that flooding of the falling liquid film limits the stability of plug flow. The resulting equation is combined with other flow pattern transition equations to produce theoretical flow pattern maps, which are then tested against experimental flow pattern data. Encouraging agreement is obtained.

  1. Inductively coupled plasma torch with laminar flow cooling

    DOE Patents [OSTI]

    Rayson, Gary D. (Las Cruces, NM); Shen, Yang (Las Cruces, NM)

    1991-04-30

    An improved inductively coupled gas plasma torch. The torch includes inner and outer quartz sleeves and tubular insert snugly fitted between the sleeves. The insert includes outwardly opening longitudinal channels. Gas flowing through the channels of the insert emerges in a laminar flow along the inside surface of the outer sleeve, in the zone of plasma heating. The laminar flow cools the outer sleeve and enables the torch to operate at lower electrical power and gas consumption levels additionally, the laminar flow reduces noise levels in spectroscopic measurements of the gaseous plasma.

  2. Aalborg Universitet Impact of Wind Shear and Tower Shadow Effects on Power System with Large Scale

    E-Print Network [OSTI]

    Hu, Weihao

    @et.aau.dk, csu@et.aau.dk, zch@et.aau.dk Abstract ­ Grid connected wind turbines are fluctuating power sources due and the power flow situation of the original power system especially when the integration of wind powerAalborg Universitet Impact of Wind Shear and Tower Shadow Effects on Power System with Large Scale

  3. Rainbow trout Oncorhynchus mykiss energetic responses to pulsed flows in the American River, California, assessed

    E-Print Network [OSTI]

    Klimley, A. Peter

    to hydroelectric-power-generation-related pulsed flows, the associated energetic costs are un- known. We implanted consumption rates were estimated for their in-river EMG data, through a complete hydroelectric power . Hydroelectric . Electromyogram . Radio telemetry. Rainbow trout Introduction Human-controlled pulsed flows

  4. Advanced Flow Diagnostics and Experimental Aerodynamics Laboratory Department of Aerospace Engineering

    E-Print Network [OSTI]

    Hu, Hui

    of complex thermal-flow phenomena: ­ Renewable Energy, wind energy, wind turbine aeromechanics. ­ Bio-flows and micro-scale heat transfer. ­ Icing physics, aircraft icing, power line icing and wind turbine icing. ­ Low-speed aerodynamics, laminar boundary layer separation, transition and flow control. ­ Wind

  5. Hydroecological factors governing surface water flow on a low-gradient floodplain

    E-Print Network [OSTI]

    to flow reductions associated with flood control. We measured flow velocity, water depth, and wind with the square of water surface slope and the fourth power of stem diameter, decreases in direct proportionHydroecological factors governing surface water flow on a low-gradient floodplain Judson W. Harvey

  6. Controlling flow in microfluidic channels with a manually actuated pin valve

    E-Print Network [OSTI]

    Eddington, David T.

    Controlling flow in microfluidic channels with a manually actuated pin valve Marie-Elena Brett to be placed within the microchannel to obstruct flow. This new valve design can attain on/off control of fluid flow without an external power source using readily-available, low-cost materials. The valve consists

  7. Forced Granular Orifice Flow

    E-Print Network [OSTI]

    Zheng Peng; Hepeng Zheng; Yimin Jiang

    2009-09-06

    The flow of granular material through an orifice is studied experimentally as a function of force $F$ pushing the flow. It is found that the flow rate increases linearly with $F$ -- a new, unexpected result that is in contrast to the usual view that $F$, completely screened by an arch formed around the orifice, has no way of altering the rate. Employing energy balance, we show that this behavior results mainly from dissipation in the granular material.

  8. Turbulent flow in graphene

    E-Print Network [OSTI]

    Kumar S. Gupta; Siddhartha Sen

    2010-06-05

    We demonstrate the possibility of a turbulent flow of electrons in graphene in the hydrodynamic region, by calculating the corresponding turbulent probability density function. This is used to calculate the contribution of the turbulent flow to the conductivity within a quantum Boltzmann approach. The dependence of the conductivity on the system parameters arising from the turbulent flow is very different from that due to scattering.

  9. Solids mass flow determination

    DOE Patents [OSTI]

    Macko, Joseph E. (Hempfield Township, Westmoreland County, PA)

    1981-01-01

    Method and apparatus for determining the mass flow rate of solids mixed with a transport fluid to form a flowing mixture. A temperature differential is established between the solids and fluid. The temperature of the transport fluid prior to mixing, the temperature of the solids prior to mixing, and the equilibrium temperature of the mixture are monitored and correlated in a heat balance with the heat capacities of the solids and fluid to determine the solids mass flow rate.

  10. Low Power Design Low PowerLow Power

    E-Print Network [OSTI]

    Pedram, Massoud

    Low Power Design USC/LPCAD Page 1 USCUSC Low PowerLow Power CADCAD MassoudMassoud PedramPedram High-Level Design Challenges and Solutions for Low Power Systems Massoud Pedram University of Southern California Department of EE-Systems Los Angeles CA 90089-256 Email: massoud@zugros.usc.edu USCUSC Low PowerLow Power

  11. Single-Phase Active Boost Rectifier with Power Factor Correction for Wireless Power Transfer Applications

    SciTech Connect (OSTI)

    Chinthavali, Madhu Sudhan [ORNL] [ORNL; Onar, Omer C [ORNL] [ORNL; Miller, John M [ORNL] [ORNL; Tang, Lixin [ORNL] [ORNL

    2013-01-01

    Wireless Power Transfer (WPT) technology is a novel research area in the charging technology that bridges utility and the automotive industries. There are various solutions that are currently being evaluated by several research teams to find the most efficient way to manage the power flow from the grid to the vehicle energy storage system. There are different control parameters that can be utilized to compensate for the change in the impedance. To understand the power flow through the system this paper presents a novel approach to the system model and the impact of different control parameters on the load power. The implementation of an active front-end rectifier on the grid side for power factor control and voltage boost capability for load power regulation is also discussed.

  12. Power Recovery 

    E-Print Network [OSTI]

    Murray, F.

    1986-01-01

    , will be the use of the ASTM Theoretical Steam Rate Tables. In addition, the author's experience regarding the minimum size for power recovery units that are economic in a Culf Coast plant will be presented. INTROD\\Jr.'rION When surveying an operation...)' The pressure ~ecompression term(~2) k~l, is used in the equat10n in a manner 1 which reduces the power recovery as calculated by the first term of the equation. From a practical view a decompression ra~~y ~0.3 is a good screening point. Note...

  13. Solar Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541 *ImpactScience(TechnicalFor Milwaukee, BySoft Solar Power

  14. Yakama Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLos Alamos verifies largest single| National1958,1CaseYakama Power May

  15. Fusion Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverse (Journal Article)Forthcoming UpgradesArea:Benefits of FES »Power

  16. Hydrogen-Bromine Flow Battery: Hydrogen Bromine Flow Batteries for Grid Scale Energy Storage

    SciTech Connect (OSTI)

    2010-10-01

    GRIDS Project: LBNL is designing a flow battery for grid storage that relies on a hydrogen-bromine chemistry which could be more efficient, last longer and cost less than today’s lead-acid batteries. Flow batteries are fundamentally different from traditional lead-acid batteries because the chemical reactants that provide their energy are stored in external tanks instead of inside the battery. A flow battery can provide more energy because all that is required to increase its storage capacity is to increase the size of the external tanks. The hydrogen-bromine reactants used by LBNL in its flow battery are inexpensive, long lasting, and provide power quickly. The cost of the design could be well below $100 per kilowatt hour, which would rival conventional grid-scale battery technologies.

  17. Balanced Flow Geostrophic, Inertial, Gradient, and Cyclostrophic Flow

    E-Print Network [OSTI]

    Hennon, Christopher C.

    Balanced Flow Geostrophic, Inertial, Gradient, and Cyclostrophic Flow The types of atmospheric flows describe here have the following characteristics: 1) Steady state (meaning that the flows do surfaces) These are "idealized" flows, created by balances of horizontal forces. They provide a qualitative

  18. Productivity & Energy Flow

    E-Print Network [OSTI]

    Mitchell, Randall J.

    1 Productivity & Energy Flow Ecosystem approach, focuses: on flow of energy, water, and nutrients (capture) of energy by autotrophs Gross (total) Net (total ­ costs) Secondary productivity- capture of energy by herbivores http://sciencebitz.com/?page_id=204 What Controls the Primary Productivity

  19. Elbow mass flow meter

    DOE Patents [OSTI]

    McFarland, A.R.; Rodgers, J.C.; Ortiz, C.A.; Nelson, D.C.

    1994-08-16

    The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity. 3 figs.

  20. Microelectromechanical flow control apparatus

    SciTech Connect (OSTI)

    Okandan, Murat (NE Albuquerque, NM)

    2009-06-02

    A microelectromechanical (MEM) flow control apparatus is disclosed which includes a fluid channel formed on a substrate from a first layer of a nonconducting material (e.g. silicon nitride). A first electrode is provided on the first layer of the nonconducting material outside the flow channel; and a second electrode is located on a second layer of the nonconducting material above the first layer. A voltage applied between the first and second electrodes deforms the fluid channel to increase its cross-sectional size and thereby increase a flow of a fluid through the channel. In certain embodiments of the present invention, the fluid flow can be decreased or stopped by applying a voltage between the first electrode and the substrate. A peristaltic pumping of the fluid through the channel is also possible when the voltage is applied in turn between a plurality of first electrodes and the substrate. A MEM flow control assembly can also be formed by providing one or more MEM flow control devices on a common substrate together with a submicron filter. The MEM flow control assembly can optionally include a plurality of pressure sensors for monitoring fluid pressure and determining flow rates through the assembly.

  1. Scaled Experimental Modeling of VHTR Plenum Flows

    SciTech Connect (OSTI)

    ICONE 15

    2007-04-01

    Abstract The Very High Temperature Reactor (VHTR) is the leading candidate for the Next Generation Nuclear Power (NGNP) Project in the U.S. which has the goal of demonstrating the production of emissions free electricity and hydrogen by 2015. Various scaled heated gas and water flow facilities were investigated for modeling VHTR upper and lower plenum flows during the decay heat portion of a pressurized conduction-cooldown scenario and for modeling thermal mixing and stratification (“thermal striping”) in the lower plenum during normal operation. It was concluded, based on phenomena scaling and instrumentation and other practical considerations, that a heated water flow scale model facility is preferable to a heated gas flow facility and to unheated facilities which use fluids with ranges of density to simulate the density effect of heating. For a heated water flow lower plenum model, both the Richardson numbers and Reynolds numbers may be approximately matched for conduction-cooldown natural circulation conditions. Thermal mixing during normal operation may be simulated but at lower, but still fully turbulent, Reynolds numbers than in the prototype. Natural circulation flows in the upper plenum may also be simulated in a separate heated water flow facility that uses the same plumbing as the lower plenum model. However, Reynolds number scaling distortions will occur at matching Richardson numbers due primarily to the necessity of using a reduced number of channels connected to the plenum than in the prototype (which has approximately 11,000 core channels connected to the upper plenum) in an otherwise geometrically scaled model. Experiments conducted in either or both facilities will meet the objectives of providing benchmark data for the validation of codes proposed for NGNP designs and safety studies, as well as providing a better understanding of the complex flow phenomena in the plenums.

  2. Star Power

    ScienceCinema (OSTI)

    None

    2014-11-18

    The U.S. Department of Energy's Princeton Plasma Physics Laboratory has released ''Star Power,'' a new informational video that uses dramatic and beautiful images and thought-provoking interviews to highlight the importance of the Laboratory's research into magnetic fusion.

  3. Star Power

    SciTech Connect (OSTI)

    2014-10-17

    The U.S. Department of Energy's Princeton Plasma Physics Laboratory has released ''Star Power,'' a new informational video that uses dramatic and beautiful images and thought-provoking interviews to highlight the importance of the Laboratory's research into magnetic fusion.

  4. An approximation technique for jet impingement flow

    SciTech Connect (OSTI)

    Najafi, Mahmoud; Fincher, Donald; Rahni, Taeibi; Javadi, KH.; Massah, H.

    2015-03-10

    The analytical approximate solution of a non-linear jet impingement flow model will be demonstrated. We will show that this is an improvement over the series approximation obtained via the Adomian decomposition method, which is itself, a powerful method for analysing non-linear differential equations. The results of these approximations will be compared to the Runge-Kutta approximation in order to demonstrate their validity.

  5. Effect of flow fluctuations and nonflow on elliptic flow methods

    E-Print Network [OSTI]

    Ollitrault, Jean-Yves

    2009-01-01

    24.10.Nz I. INTRODUCTION II. FLOW METHODS Elliptic ?ow hasin the participant plane. Flow methods involve variousow e?ects are negligible. Flow ?uctuations modify both the

  6. Solar Power for Tanzania

    SciTech Connect (OSTI)

    Chen, Christine; Gerace, Jay; Mehner, Nicole; Mohamed, Sharif; Reiss, Kelly

    1999-12-06

    Condensed list of products and activities: 8 educational posters and 1 informational brochure (all original illustrations and text); a business plan with micro-agreements; corporation created called Tanzanian Power, LLC; business feasibility study developed with the University of Albany; Hampshire College collaborated in project development; research conducted seeking similar projects in underdeveloped countries; Citibank proposal submitted (but rejected); cleaned and sent PV panels to Tanzania; community center built in Tanzania; research and list provided to Robinson for educational TV videos and product catalogs; networked with Chase Manhattan Bank for new solar panels; maintained flow of information among many people (stateside and Tanzania); wrote and sent press releases and other outreach information. Several families purchased panels.

  7. Power superconducting power transmission cable

    DOE Patents [OSTI]

    Ashworth, Stephen P. (Cambridge, GB)

    2003-01-01

    The present invention is for a compact superconducting power transmission cable operating at distribution level voltages. The superconducting cable is a conductor with a number of tapes assembled into a subconductor. These conductors are then mounted co-planarly in an elongated dielectric to produce a 3-phase cable. The arrangement increases the magnetic field parallel to the tapes thereby reducing ac losses.

  8. Flow of suspensions in pipelines

    SciTech Connect (OSTI)

    Nasr-El-Din, H.A. [Laboratory R& D Center, Saudi Aramco, Dhahran (Saudi Arabia)

    1996-12-31

    Slurry pipelines are used in many industrial applications. Several parameters are often needed by the operator, including critical deposit velocity, solids concentration, and particle velocity profiles. This chapter first reviews important formulas used to predict critical deposit velocity both in Newtonian and non-Newtonian (power-law) carrier fluids. Various methods to measure local velocity and solids concentration profiles in slurry pipelines are discussed. Local solids concentration can be measured by sample withdrawal technique. However, the sample should be withdrawn at isokinetic conditions. Sampling downstream of tees and elbows can result in significant errors in measuring solids concentration. Gamma-ray absorption methods can be used; however, two scans are needed to obtain local solids concentration. Bulk velocity of conductive slurries can be obtained using magnetic flow meters mounted on a vertical section of the pipe. Local particle velocity can be obtained using conductivity probes. NMR methods can be used to measure concentration and particle velocity profiles but are limited to small-diameter pipes. Vertical solids concentration of coarse slurries flowing in a horizontal pipeline exhibits a positive gradient near the bottom of the pipe. Traditional models to predict these profiles are given, and new mathematical models and computer software to determine these profiles are introduced. 104 refs., 31 figs., 1 tab.

  9. Bedrock Erosion by Granular Flow

    E-Print Network [OSTI]

    Hsu, Leslie

    2010-01-01

    of boulders later in the flow when the matrix has thickenedMaximum height of the flow is 3.3 m. Appendix A true storyThe physics of debris flows, Reviews of Geophysics 35(3),

  10. Magnetically stimulated fluid flow patterns

    SciTech Connect (OSTI)

    Martin, Jim; Solis, Kyle

    2014-03-06

    Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.

  11. Magnetically stimulated fluid flow patterns

    ScienceCinema (OSTI)

    Martin, Jim; Solis, Kyle

    2014-08-06

    Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.

  12. A Dual Method for Computing Power Transfer Distribution Factors

    E-Print Network [OSTI]

    Ronellenfitsch, Henrik; Witthaut, Dirk

    2015-01-01

    Power Transfer Distribution Factors (PTDFs) play a crucial role in power grid security analysis, planning, and redispatch. Fast calculation of the PTDFs is therefore of great importance. In this letter, we present a dual method of computing PTDFs. It uses power flows along topological cycles of the network but still relies on simple matrix algebra. For power grids containing a relatively small number of cycles, the method offers a significant speedup of numerical calculations.

  13. Analysis of pure electrical and cogeneration steam power plants

    SciTech Connect (OSTI)

    Albar, A.F.

    1982-01-01

    General Electric's method of steam turbine performance was used with pure electrical and with cogeneration power plants at various flow rates. Comparisons were made for two cases: (1) the same amount of heat is added to each boiler and the amount of electrical power generated is compared; and (2) when each plant should produce the same amount of electric power and the amount of heat added to each boiler is compared. Cogeneration is energetically more efficient than pure electrical plant. Correlations for the dependence of heat rate, power generated, heat added to throttle flow ratio were obtained from this work.

  14. Isolated and soft-switched power converter

    DOE Patents [OSTI]

    Peng, Fang Zheng (Knoxville, TN); Adams, Donald Joe (Knoxville, TN)

    2002-01-01

    An isolated and soft-switched power converter is used for DC/DC and DC/DC/AC power conversion. The power converter includes two resonant tank circuits coupled back-to-back through an isolation transformer. Each resonant tank circuit includes a pair of resonant capacitors connected in series as a resonant leg, a pair of tank capacitors connected in series as a tank leg, and a pair of switching devices with anti-parallel clamping diodes coupled in series as resonant switches and clamping devices for the resonant leg. The power converter is well suited for DC/DC and DC/DC/AC power conversion applications in which high-voltage isolation, DC to DC voltage boost, bidirectional power flow, and a minimal number of conventional switching components are important design objectives. For example, the power converter is especially well suited to electric vehicle applications and load-side electric generation and storage systems, and other applications in which these objectives are important. The power converter may be used for many different applications, including electric vehicles, hybrid combustion/electric vehicles, fuel-cell powered vehicles with low-voltage starting, remote power sources utilizing low-voltage DC power sources, such as photovoltaics and others, electric power backup systems, and load-side electric storage and generation systems.

  15. Development of the T+M coupled flow-geomechanical simulator to describe fracture propagation and coupled flow-thermal-geomechanical processes in tight/shale gas systems

    SciTech Connect (OSTI)

    Kim, Jihoon; Moridis, George

    2013-05-22

    We developed a hydraulic fracturing simulator by coupling a flow simulator to a geomechanics code, namely T+M simulator. Modeling of the vertical fracture development involves continuous updating of the boundary conditions and of the data connectivity, based on the finite element method for geomechanics. The T+M simulator can model the initial fracture development during the hydraulic fracturing operations, after which the domain description changes from single continuum to double or multiple continua in order to rigorously model both flow and geomechanics for fracture-rock matrix systems. The T+H simulator provides two-way coupling between fluid-heat flow and geomechanics, accounting for thermoporomechanics, treats nonlinear permeability and geomechanical moduli explicitly, and dynamically tracks changes in the fracture(s) and in the pore volume. We also fully accounts for leak-off in all directions during hydraulic fracturing. We first validate the T+M simulator, matching numerical solutions with the analytical solutions for poromechanical effects, static fractures, and fracture propagations. Then, from numerical simulation of various cases of the planar fracture propagation, shear failure can limit the vertical fracture propagation of tensile failure, because of leak-off into the reservoirs. Slow injection causes more leak-off, compared with fast injection, when the same amount of fluid is injected. Changes in initial total stress and contributions of shear effective stress to tensile failure can also affect formation of the fractured areas, and the geomechanical responses are still well-posed.

  16. Enviro Hurdles: Instream Flow | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Hurdles: Instream Flow Enviro Hurdles: Instream Flow Enviro Hurdles: Instream Flow 76enviornlbevelhimer4.pptx More Documents & Publications Instream Flow Project Development and...

  17. Power Right. Power Smart. Efficient Computer Power Supplies and...

    Energy Savers [EERE]

    consume? Higher efficiency power supplies reduce energy consumption, thus cutting your electricity bill. They reduce power consumption, helping your electric utility meet peak...

  18. Flow Map Manager 

    E-Print Network [OSTI]

    Moya, Maria J

    2011-11-24

    Long-distance bus companies, operate services along routes which have a flow of passengers. Along a route some passengers will leave the bus while others join. To monitor demand sufficiently well a tool is required which can help estimate...

  19. Complex Flow Workshop Report

    SciTech Connect (OSTI)

    none,

    2012-05-01

    This report documents findings from a workshop on the impacts of complex wind flows in and out of wind turbine environments, the research needs, and the challenges of meteorological and engineering modeling at regional, wind plant, and wind turbine scales.

  20. Optical flow switching

    E-Print Network [OSTI]

    Chan, Vincent W. S.

    Present-day networks are being challenged by dramatic increases in bandwidth demand of emerging applications. We will explore a new transport, ldquooptical flow switchingrdquo, that will enable significant growth and ...

  1. Parallel flow diffusion battery

    DOE Patents [OSTI]

    Yeh, H.C.; Cheng, Y.S.

    1984-01-01

    A parallel flow diffusion battery for determining the mass distribution of an aerosol has a plurality of diffusion cells mounted in parallel to an aerosol stream, each diffusion cell including a stack of mesh wire screens of different density.

  2. Parallel flow diffusion battery

    DOE Patents [OSTI]

    Yeh, Hsu-Chi (Albuquerque, NM); Cheng, Yung-Sung (Albuquerque, NM)

    1984-08-07

    A parallel flow diffusion battery for determining the mass distribution of an aerosol has a plurality of diffusion cells mounted in parallel to an aerosol stream, each diffusion cell including a stack of mesh wire screens of different density.

  3. Advanced Flow Battery Electrodes: Low-cost, High-Performance 50-Year Electrode

    SciTech Connect (OSTI)

    2010-09-01

    GRIDS Project: Primus Power is developing zinc-based, rechargeable liquid flow batteries that could produce substantially more energy at lower cost than conventional batteries. A flow battery is similar to a conventional battery, except instead of storing its energy inside the cell it stores that energy for future use in chemicals that are kept in tanks that sit outside the cell. One of the most costly components in a flow battery is the electrode, where the electrochemical reactions actually occur. Primus Power is investigating and developing mixed-metal materials for their electrodes that could ultimately reduce the lifetime cost of flow batteries because they are more durable and long-lasting than electrodes found in traditional batteries. Using these electrodes, Primus Power’s flow batteries can be grouped together into robust, containerized storage pods for use by utilities, renewable energy developers, businesses, and campuses.

  4. Electrochemical flow capacitors

    DOE Patents [OSTI]

    Gogotsi, Yury; Presser, Volker; Kumbar, Emin Caglan

    2015-11-05

    The present invention generally relates to devices for energy storage technologies, and more particularly to electrochemical flow capacitor systems and applications. In some aspects, these flow capacitors have at least one electrode comprising a non-stationary solid or semi-solid composition comprising supercapacitive particles and an electrolytic solvent in electrical communication with at least one current collector, and energy is stored and/or released by charging and/or discharging the electrode(s).

  5. Electrochemical flow capacitors

    DOE Patents [OSTI]

    Gogotsi, Yury; Presser, Volker; Kumbur, Emin Caglan

    2015-10-27

    The present invention generally relates to devices for energy storage technologies, and more particularly to electrochemical flow capacitor systems and applications. In some aspects, these flow capacitors have at least one electrode comprising a non-stationary solid or semi-solid composition comprising supercapacitive particles and an electrolytic solvent in electrical communication with at least one current collector, and energy is stored and/or released by charging and/or discharging the electrode(s).

  6. Cost and Performance Model for Redox Flow Batteries

    SciTech Connect (OSTI)

    Viswanathan, Vilayanur V.; Crawford, Aladsair J.; Stephenson, David E.; Kim, Soowhan; Wang, Wei; Li, Bin; Coffey, Greg W.; Thomsen, Edwin C.; Graff, Gordon L.; Balducci, Patrick J.; Kintner-Meyer, Michael CW; Sprenkle, Vincent L.

    2014-02-01

    A cost model was developed for all vanadium and iron-vanadium redox flow batteries. Electrochemical performance modeling was done to estimate stack performance at various power densities as a function of state of charge. This was supplemented with a shunt current model and a pumping loss model to estimate actual system efficiency. The operating parameters such as power density, flow rates and design parameters such as electrode aspect ratio, electrolyte flow channel dimensions were adjusted to maximize efficiency and minimize capital costs. Detailed cost estimates were obtained from various vendors to calculate cost estimates for present, realistic and optimistic scenarios. The main drivers for cost reduction for various chemistries were identified as a function of the energy to power ratio of the storage system. Levelized cost analysis further guided suitability of various chemistries for different applications.

  7. Conjugate flow action functionals

    E-Print Network [OSTI]

    Daniele Venturi

    2013-10-15

    We present a new general method to construct an action functional for a non-potential field theory. The key idea relies on representing the governing equations of the theory relative to a diffeomorphic flow of curvilinear coordinates which is assumed to be functionally dependent on the solution field. Such flow, which will be called the conjugate flow of the theory, evolves in space and time similarly to a physical fluid flow of classical mechanics and it can be selected in order to symmetrize the Gateaux derivative of the field equations with respect to suitable local bilinear forms. This is equivalent to requiring that the governing equations of the field theory can be derived from a principle of stationary action on a Lie group manifold. By using a general operator framework, we obtain the determining equations of such manifold and the corresponding conjugate flow action functional. In particular, we study scalar and vector field theories governed by second-order nonlinear partial differential equations. The identification of transformation groups leaving the conjugate flow action functional invariant could lead to the discovery of new conservation laws in fluid dynamics and other disciplines.

  8. Numerical simulation of three-dimensional electrical flow through geomaterials 

    E-Print Network [OSTI]

    Akhtar, Anwar Saeed

    1998-01-01

    95 99 V ELECTRICAL FLOW AROUND AN ELECTRICAL CONE PENETROMETER 104 5. 1 INTRODUCTION 5. 2 ANALYTICAL SOLUTION FOR ELECTRICAL FLOW AROUND AN ELECTRICAL CONE PENETROMETER 5. 3 NUMERICAL INVESTIGATION 5. 4 COMPARISON OF ANALYTICAL AND NUMERICAL... RESULTS 5. 5 CONCLUSION AND APPLICATION 5. 5. 1 Utilization of Numerical Results 104 106 110 113 115 116 VI EXPERIMENTAL EQUIPMENT DESIGN 121 6. 1 INTRODUCTION 6. 2 ELECTRICAL POWER SOURCE 6. 3 ELECTRICAL RESISTIVITY CONE PENETROMETER 6. 4...

  9. Design considerations for inverters in fluid flow control 

    E-Print Network [OSTI]

    Guggari, Mallappa Ishwarappa

    1989-01-01

    . 18 power circuit of current source inverter 3. 19 Output waveforms of current source inverter 5. 1 Response of fluid flow control system to a ramp reference input . 5. 2 Load torque and acceleration torque characteristics with centrifugal pump.... The process industry specifications for flow control have also become stringent, demanding an alternative to throttle valve control system, which is plagued with problems like poor dynamic response, dead- band, etc. In the literature, most of the attention...

  10. Catalytic combustor for integrated gasification combined cycle power plant

    DOE Patents [OSTI]

    Bachovchin, Dennis M. (Mauldin, SC); Lippert, Thomas E. (Murrysville, PA)

    2008-12-16

    A gasification power plant 10 includes a compressor 32 producing a compressed air flow 36, an air separation unit 22 producing a nitrogen flow 44, a gasifier 14 producing a primary fuel flow 28 and a secondary fuel source 60 providing a secondary fuel flow 62 The plant also includes a catalytic combustor 12 combining the nitrogen flow and a combustor portion 38 of the compressed air flow to form a diluted air flow 39 and combining at least one of the primary fuel flow and secondary fuel flow and a mixer portion 78 of the diluted air flow to produce a combustible mixture 80. A catalytic element 64 of the combustor 12 separately receives the combustible mixture and a backside cooling portion 84 of the diluted air flow and allows the mixture and the heated flow to produce a hot combustion gas 46 provided to a turbine 48. When fueled with the secondary fuel flow, nitrogen is not combined with the combustor portion.

  11. Wind Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking WithTelecentricNCubicthe FOIA?ResourceMeasurement Buoy AdvancesWind

  12. EE 441.3 (3L) Power System Analysis

    E-Print Network [OSTI]

    Saskatchewan, University of

    analysis using digital computer Module II: Load Flow Studies The static load flow equations Classification, classification of system buses, Gauss-Seidel and Newton-Raphson methods, 3- Power system stability; modeling of the synchronous machine during transients; swing equation; equal area criterion; digital computer solution

  13. PS10 Solar Power Tower Xi Jing, Fang

    E-Print Network [OSTI]

    Prevedouros, Panos D.

    area equivalent of 17 American Football Tower Solar receiver 4 vertical panels 18ft*39ft Steam turbine the solar energy to the grid in 2007 Operating cash flow 1.4 millions in 2007.Operating cash flow 1PS10 Solar Power Tower Xi Jing, Fang #12;Overview Magnitudes , Cost & TechnologiesMagnitudes , Cost

  14. Solar thermal power system

    DOE Patents [OSTI]

    Bennett, Charles L.

    2010-06-15

    A solar thermal power generator includes an inclined elongated boiler tube positioned in the focus of a solar concentrator for generating steam from water. The boiler tube is connected at one end to receive water from a pressure vessel as well as connected at an opposite end to return steam back to the vessel in a fluidic circuit arrangement that stores energy in the form of heated water in the pressure vessel. An expander, condenser, and reservoir are also connected in series to respectively produce work using the steam passed either directly (above a water line in the vessel) or indirectly (below a water line in the vessel) through the pressure vessel, condense the expanded steam, and collect the condensed water. The reservoir also supplies the collected water back to the pressure vessel at the end of a diurnal cycle when the vessel is sufficiently depressurized, so that the system is reset to repeat the cycle the following day. The circuital arrangement of the boiler tube and the pressure vessel operates to dampen flow instabilities in the boiler tube, damp out the effects of solar transients, and provide thermal energy storage which enables time shifting of power generation to better align with the higher demand for energy during peak energy usage periods.

  15. Electric Power Network Security Analysis via Minimum Cut Relaxation Kin Cheong Sou, Henrik Sandberg and Karl Henrik Johansson

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    ) and ma directed arcs (i.e., transmission lines) on which power flows. The flow can The authorsElectric Power Network Security Analysis via Minimum Cut Relaxation Kin Cheong Sou, Henrik Sandberg the security of power transmission networks is presented. In order to strategically allocate protection devices

  16. 390 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 27, NO. 1, FEBRUARY 2012 Scalable Newton-Krylov Solver

    E-Print Network [OSTI]

    Vuik, Kees

    and solar energy. Traditional generators are connected to the transmis- sion network. This is referred. INTRODUCTION THE power flow, or load flow, computation is the most important network computation in power provide a steady-state simulation of power systems. The consumption of electricity keeps on rising each

  17. Fluid Flow Estimation Through Integration of Physical Flow Configurations

    E-Print Network [OSTI]

    Garbe, Christoph S.

    Fluid Flow Estimation Through Integration of Physical Flow Configurations Christoph S. Garbe IWR, University of Heidelberg Christoph.Garbe@iwr.uni-heidelberg.de Abstract. The measurement of fluid flows is an emerging field for op- tical flow computation. In a number of such applications, a tracer is visualized

  18. High average power laser using a transverse flowing liquid host

    DOE Patents [OSTI]

    Ault, Earl R.; Comaskey, Brian J.; Kuklo, Thomas C.

    2003-07-29

    A laser includes an optical cavity. A diode laser pumping device is located within the optical cavity. An aprotic lasing liquid containing neodymium rare earth ions fills the optical cavity. A circulation system that provides a closed loop for circulating the aprotic lasing liquid into and out of the optical cavity includes a pump and a heat exchanger.

  19. AVTA: Vehicle to Grid Power Flow Regulations and Building Codes...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Merit Review 2014: PEV Integration with Renewables Vehicle Technologies Office Merit Review 2015: Electric Vehicle Grid Integration ANSI Electric Vehicle Standards Roadmap v2.0...

  20. Solving the power flow equations: a monotone operator approach (Technical

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference)Feedback System in the CERNimmobilizeReport) | SciTech Connect

  1. Solving the power flow equations: a monotone operator approach (Technical

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference)Feedback System in the CERNimmobilizeReport) | SciTech

  2. Free Flow Power Partners to Improve Hydrokinetic Turbine Performance and

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: Alternative Fuelsof Energy Services » ProgramPolicySenateFlyer, Title VIFormatBlogFred L.Cost

  3. PREPRINT DECEMBER 1999; SUBMITTED TO IEEE TRANS. ON POWER SYSTEMS SENSITIVITY OF TRANSFER CAPABILITY MARGINS

    E-Print Network [OSTI]

    are limited by transmission network security. Transfer capa- bility measures the maximum power transfer fast to evaluate. The approach is consistent with the current industrial practice of using DC load flow: power system security, power system control, power transmission planning INTRODUCTION Transfer

  4. Analysis of the velocity field of granular hopper flow

    E-Print Network [OSTI]

    F. G. R. Magalhăes; A. P. F. Atman; J. G. Moreira; H. J. Herrmann

    2015-07-22

    We report the analysis of radial characteristics of the flow of granular material through a conical hopper. The discharge is simulated for various orifice sizes and hopper opening angles. Velocity profiles are measured along two radial lines from the hopper cone vertex: along the main axis of the cone and along its wall. An approximate power law dependence on the distance from the orifice is observed for both profiles, although differences between them can be noted. In order to quantify these differences, we propose a Local Mass Flow index that is a promising tool in the direction of a more reliable classification of the flow regimes in hoppers.

  5. Energy Storage for the Power Grid

    SciTech Connect (OSTI)

    Imhoff, Carl; Vaishnav, Dave

    2014-07-01

    The iron vanadium redox flow battery was developed by researchers at Pacific Northwest National Laboratory as a solution to large-scale energy storage for the power grid. This technology provides the energy industry and the nation with a reliable, stable, safe, and low-cost storage alternative for a cleaner, efficient energy future.

  6. Polysilicon Vertical Actuator Powered with Waste Heat

    E-Print Network [OSTI]

    Hamoui, Anas

    an electric current flow through the device structure and induce Joule heating. The corresponding increase require an external battery that is several times the size of the microsystem itself. It is the power that do not rely on a bulky battery with fairly limited energy storage capacity. Through the application

  7. Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry

    E-Print Network [OSTI]

    Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry using energy flow method Azimuthal angle distribution at Q2 >100 GeV2 Energy flow method.Ukleja on behalf of the ZEUS Collaboration #12; Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I

  8. Flow Batteries A Historical Perspective

    E-Print Network [OSTI]

    Flow Batteries A Historical Perspective Robert F. Savinell Case Western Reserve University Department of Chemical Engineering DOE Flow Battery Workshop March 2012 #12;2 OUTLINE ·The first flow cell? ·Review articles- documented progress ·Early NASA Work- some learning ·Fuel Cell and Flow Battery

  9. Two-phase flow studies

    SciTech Connect (OSTI)

    Hanold, R.J.

    1983-12-01

    The two-phase flow program is directed at understanding the hydrodynamics of two-phase flows. The two-phase flow regime is characterized by a series of flow patterns that are designated as bubble, slug, churn, and annular flow. Churn flow has received very little scientific attention. This lack of attention cannot be justified because calculations predict that the churn flow pattern will exist over a substantial portion of the two-phase flow zone in producing geothermal wells. The University of Houston is experimentally investigating the dynamics of churn flow and is measuring the holdup over the full range of flow space for which churn flow exists. These experiments are being conducted in an air/water vertical two-phase flow loop. Brown University has constructed and is operating a unique two-phase flow research facility specifically designed to address flow problems of relevance to the geothermal industry. An important feature of the facility is that it is dedicated to two-phase flow of a single substance (including evaporation and condensation) as opposed to the case of a two-component two-phase flow. This facility can be operated with horizontal or vertical test sections of constant diameter or with step changes in diameter to simulate a geothermal well profile.

  10. Magnets and Power Supplies

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Up: APS Storage Ring Parameters Previous: Longitudinal bunch profile and Magnets and Power Supplies Dipole Magnets and Power Supplies Value Dipole Number 80+1 No. of power...

  11. Interpreting Territory and Power

    E-Print Network [OSTI]

    Bevir, Mark

    2010-01-01

    Press, 1960). Bulpitt, Territory and Power, p. 57.Bulpitt, Territory and Power, p. 61-62.Bulpitt, Territory and Power, p. 63. Bulpitt, Territory and

  12. Power Simulator for Smartphones

    E-Print Network [OSTI]

    Gkolemis, Nikolaos

    2013-01-01

    Kim M. , Woo S. , “Accurate GPU Power Estimation forMobile Device Power Profiling”, IEEE ICCE (2013),http://Kumar S. , John L. , “Power Modeling of SDRAMs”, University

  13. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01

    2008, uses concentrated solar power to split water. Figurethe main reason the potential for solar power is boundless.a clean energy source, solar power is inexhaustible, fairly

  14. PowerPoint Presentation

    Office of Environmental Management (EM)

    to these monitors to handle brief power outages, but future plans include providing site emergency power to these monitors for extended power outages Equipment to be added...

  15. Wind Power Outreach Campaign

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Wind Power Wind Power Main Page Outreach Programs Image Gallery FAQs Links Software Hydro Power INL Home Outreach Programs A team of educators and scientists from the Idaho...

  16. ELECTROCHEMICAL POWER FOR TRANSPORTATION

    E-Print Network [OSTI]

    Cairns, Elton J.

    2012-01-01

    electric power generating plant, and the distributionrequired on the power-generating plant and not on the vehi-in either power-generating plants or combustion engines,

  17. Northwest, the Bonneville Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    causing a protective shutdown that created cascading power outages across the regional power grid. Power outages like these are much more than an inconvenience to consumers....

  18. Power management system

    DOE Patents [OSTI]

    Algrain, Marcelo C. (Peoria, IL); Johnson, Kris W. (Washington, IL); Akasam, Sivaprasad (Peoria, IL); Hoff, Brian D. (East Peoria, IL)

    2007-10-02

    A method of managing power resources for an electrical system of a vehicle may include identifying enabled power sources from among a plurality of power sources in electrical communication with the electrical system and calculating a threshold power value for the enabled power sources. A total power load placed on the electrical system by one or more power consumers may be measured. If the total power load exceeds the threshold power value, then a determination may be made as to whether one or more additional power sources is available from among the plurality of power sources. At least one of the one or more additional power sources may be enabled, if available.

  19. POWER PURCHASE AGREEMENT DELMARVA POWER & LIGHT COMPANY

    E-Print Network [OSTI]

    Firestone, Jeremy

    POWER PURCHASE AGREEMENT between DELMARVA POWER & LIGHT COMPANY ("Buyer") and BLUEWATER WIND 3.5 Energy Forecasts, Scheduling and Balancing.......................................... 39 3

  20. Power oscillator

    DOE Patents [OSTI]

    Gitsevich, Aleksandr (Montgomery Village, MD)

    2001-01-01

    An oscillator includes an amplifier having an input and an output, and an impedance transformation network connected between the input of the amplifier and the output of the amplifier, wherein the impedance transformation network is configured to provide suitable positive feedback from the output of the amplifier to the input of the amplifier to initiate and sustain an oscillating condition, and wherein the impedance transformation network is configured to protect the input of the amplifier from a destructive feedback signal. One example of the oscillator is a single active element device capable of providing over 70 watts of power at over 70% efficiency. Various control circuits may be employed to match the driving frequency of the oscillator to a plurality of tuning states of the lamp.

  1. Flow and axial dispersion in a sinusoidal-walled tube: Effects of inertial and unsteady flows

    SciTech Connect (OSTI)

    Richmond, Marshall C.; Perkins, William A.; Scheibe, Timothy D.; Lambert, Adam; Wood, Brian D.

    2013-12-01

    Dispersion in porous media flows has been the subject of much experimental, theoretical and numerical study. Here we consider a wavy-walled tube (a three-dimensional tube with sinusoidally-varying diameter) as a simplified conceptualization of flow in porous media, where constrictions represent pore throats and expansions pore bodies. A theoretical model for effective (macroscopic) longitudinal dispersion in this system has been developed by volume averaging the microscale velocity field. Direct numerical simulation using computational fluid dynamics (CFD) methods was used to compute velocity fields by solving the Navier-Stokes equations, and also to numerically solve the volume averaging closure problem, for a range of Reynolds numbers (Re) spanning the low-Re to inertial flow regimes, including one simulation at Re = 449 for which unsteady flow was observed. Dispersion values were computed using both the volume averaging solution and a random walk particle tracking method, and results of the two methods were shown to be consistent. Our results are compared to experimental measurements of dispersion in porous media and to previous theoretical results for the low-Re, Stokes flow regime. In the steady inertial regime we observe an power-law increase in effective longitudinal dispersion (DL) with Re, consistent with previous results. This rapid rate of increase is caused by trapping of solute in expansions due to flow separation (eddies). For the unsteady case (Re = 449), the rate of increase of DL with Re was smaller than that observed at lower Re. Velocity fluctuations in this regime lead to increased rates of solute mass transfer between the core flow and separated flow regions, thus diminishing the amount of tailing caused by solute trapping in eddies and thereby reducing longitudinal dispersion.

  2. Analytical solutions for benchmarking cold regions subsurface water flow and energy transport models: One-dimensional soil thaw

    E-Print Network [OSTI]

    McKenzie, Jeffrey M.

    Analytical solutions for benchmarking cold regions subsurface water flow and energy transport Freezing and thawing a b s t r a c t Numerous cold regions water flow and energy transport models have of powerful simulators of cold regions subsurface water flow and energy transport have emerged in recent years

  3. Study of flow fields induced by surface dielectric barrier discharge actuator in low-pressure air

    SciTech Connect (OSTI)

    Che, Xueke E-mail: st@mail.iee.ac.cn; Nie, Wansheng; Tian, Xihui; Hou, Zhiyong; He, Haobo; Zhou, Penghui; Zhou, Siyin; Yang, Chao; Shao, Tao E-mail: st@mail.iee.ac.cn

    2014-04-15

    Surface dielectric barrier discharge (SDBD) is a promising method for a flow control. Flow fields induced by a SDBD actuator driven by the ac voltage in static air at low pressures varying from 1.0 to 27.7?kPa are measured by the particle image velocimetry method. The influence of the applied ac voltage frequency and magnitude on the induced flow fields is studied. The results show that three different classes of flow fields (wall jet flow field, complex flow field, and vortex-shape flow field) can be induced by the SDBD actuator in the low-pressure air. Among them, the wall jet flow field is the same as the tangential jet at atmospheric pressure, which is, together with the vertical jet, the complex flow field. The vortex-shape flow field is composed of one vertical jet which points towards the wall and two opposite tangential jets. The complex and the vortex-shape flow fields can be transformed to the wall jet flow field when the applied ac voltage frequency and magnitude are changed. It is found that the discharge power consumption increases initially, decreases, and then increases again at the same applied ac voltage magnitude when the air pressure decreases. The tangential velocity of the wall jet flow field increases when the air pressure decreases. It is however opposite for the complex flow field. The variation of the applied ac voltage frequency influences differently three different flow fields. When the applied ac voltage magnitude increases at the same applied ac voltage frequency, the maximal jet velocity increases, while the power efficiency increases only initially and then decreases again. The discharge power shows either linear or exponential dependences on the applied ac voltage magnitude.

  4. Analysis of oscillating flow cooled SMA actuator 

    E-Print Network [OSTI]

    Pachalla Seshadri, Rajagopal

    2005-11-01

    advantageously here. The widespread use of SMAs in actuators is limited by their low bandwidth. Use of SMAs in two-way actuators requires that they undergo thermal cycling (heating and cooling). While SMAs can be heated quickly by resistive heating, conventional...

  5. Multiphase cooling flows

    E-Print Network [OSTI]

    Peter A. Thomas

    1996-08-20

    I discuss the multiphase nature of the intracluster medium whose neglect can lead to overestimates of the baryon fraction of clusters by up to a factor of two. The multiphase form of the cooling flow equations are derived and reduced to a simple form for a wide class of self-similar density distributions. It is shown that steady-state cooling flows are \\emph{not} consistent with all possible emissivity profiles which can therefore be used as a test of the theory. In combination, they provide strong constraints on the mass distribution within the cooling radius.

  6. Variable Refrigerant Flow HVAC 

    E-Print Network [OSTI]

    Jones, S.

    2013-01-01

    Variable refrigerant flow technology HVAC CATEE 2013 San Antonio, TX ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency Conference, San Antonio, Texas Dec. 16-18 What is the acronym VRF? ? Variable Refrigerant Flow Operates like a... heat pump utilizing VFD Inverter Compressors and LEV’s Unlike conventional commercial and residential HVAC systems in the USA The predominate method of cooling and heating in the world ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency...

  7. Bonneville Power Administration 1991 Annual Report.

    SciTech Connect (OSTI)

    United States. Bonneville Power Administration.

    1992-01-01

    Congress enacted the Bonneville Project Act in 1937, creating the Bonneville Power Administration to market and transmit the power produced by Bonneville Dam on the Columbia River. Since then, Congress has directed BPA to sell at wholesale the power produced at a total of 30 Federal dams in the Pacific Northwest, and to acquire conservation and generating resources sufficient to meet the needs of BPA`s customer utilities. The dams and the electrical system are known as the Federal Columbia River Power System. Bonneville sells wholesale power to public and private utilities, rural cooperatives, large industries, and Federal agencies. BPA also sells or exchanges power with utilities in California. BPA uses revenues from the sale of power and transmission services to recover its own expenses, to repay the Federal investment in the power system, and to pay for the resources it has acquired. BPA pays for operation and maintenance expenses at the Federal dams and at non-Federal power plants. It also pays for irrigation benefits of Federal projects allocated to power to repay, and for fish and wildlife projects which offset damage to these resources by the Federal hydropower system. This document is the 1991 statement of budget, financial statement, cash flows, capitalization, expenses, and projects. An organization chart is included.

  8. Scenario Reduction and Scenario Tree Construction for Power Management Problems

    E-Print Network [OSTI]

    Römisch, Werner

    1 Scenario Reduction and Scenario Tree Construction for Power Management Problems Nicole Gr¨owe-Kuska, Holger Heitsch and Werner R¨omisch Abstract-- Portfolio and risk management problems of power utilities and corresponding probabilities to model the multivariate random data process (electrical load, stream flows

  9. Biennial Assessment of the Fifth Power Plan Transmission Issues

    E-Print Network [OSTI]

    unscheduled electricity flows over transmission lines leading to increased risks to electric system-construction alternatives to transmission; · Inability to effectively monitor the wholesale electricity market, identifyBiennial Assessment of the Fifth Power Plan Transmission Issues INTRODUCTION The Fifth Power Plan

  10. Flow cytometry apparatus

    DOE Patents [OSTI]

    Pinkel, Daniel (Walnut Creek, CA)

    1991-01-01

    An obstruction across the flow chamber creates a one dimensional convergence of a sheath fluid. A passageway in the construction directs flat cells near to the area of one dimensional convergence in the sheath fluid to provide proper orientation of flat cells at fast rates.

  11. Flow cytometry apparatus

    DOE Patents [OSTI]

    Pinkel, D.

    1987-11-30

    An obstruction across the flow chamber creates a one-dimensional convergence of a sheath fluid. A passageway in the obstruction directs flat cells near to the area of one-dimensional convergence in the sheath fluid to provide proper orientation of flat cells at fast rates. 6 figs.

  12. Microfluidic gas flow profiling using remote detection NMR

    SciTech Connect (OSTI)

    Hilty, Christian; McDonnell, Erin; Granwehr, Josef; Pierce,Kimberly; Han, Song-I Han; Pines, Alexander

    2005-05-06

    Miniaturized fluid handling devices have recently attracted considerable interest in many areas of science1. Such microfluidic chips perform a variety of functions, ranging from analysis of biological macromolecules2,3 to catalysis of reactions and sensing in the gas phase4,5. To enable precise fluid handling, accurate knowledge of the flow properties within these devices is important. Due to low Reynolds numbers, laminar flow is usually assumed. However, either by design or unintentionally, the flow characteristic in small channels is often altered, for example by surface interactions, viscous and diffusional effects, or electrical potentials. Therefore, its prediction is not always straight-forward6-8. Currently, most microfluidic flow measurements rely on optical detection of markers9,10, requiring the injection of tracers and transparent devices. Here, we show profiles of microfluidic gas flow in capillaries and chip devices obtained by NMR in the remote detection modality11,12. Through the transient measurement of dispersion13, NMR is well adaptable for non-invasive, yet sensitive determination of the flow field and provides a novel and potentially more powerful tool to profile flow in capillaries and miniaturized flow devices.

  13. Leakage characterization of a piloted power operated relief valve

    SciTech Connect (OSTI)

    Ezekoye, L.I. [Westinghouse Electric Corp, Pittsburgh, PA (United States). Nuclear Technology Division; Hess, M.D. [Northeast Utilities, Waterford, CT (United States). Millstone Station

    1995-11-01

    In Westinghouse Pressurized Water Reactors (PWRs), power operated relief valves (PORVs) are used to provide overpressure protection of the Pressurizer. The valves are fail closed globe valves which means that power is required to open the valves and, on loss of power, the valves close. There are two ways to operate the PORVs. The more common way is to directly couple the disc to an actuator via a disc-stem assembly. The type of design is not the object of this paper. The other and less common way of operating a PORV is by piloting the main valve such that the opening or closing of a pilot valve opens and closes the main valve. This is the design of interest. In most plants, the PORVs are installed with a water loop seal while in some plants no water loop seals are used. It is generally accepted that loop seal installation minimizes valve seat leakage. In non-loop seal installation, the valve seat is exposed to steam which increases the potential for seat leakage. This paper describes the results of some tests performed with nitrogen and steam to characterize the leakage potential of a pilot operated PORV. The test results were compared with seat leakage tests of check valves to provide insight on the leakage testing of pilot operated valves and check valves. The paper also compares the test data with leakage estimates using the ASME/ANSI OM Code guidance on valve leakage.

  14. DOWNHOLE POWER GENERATION AND WIRELESS COMMUNICATIONS FOR INTELLIGENT COMPLETIONS APPLICATIONS

    SciTech Connect (OSTI)

    Paul Tubel

    2003-07-05

    The third quarter of the project was dedicated to creating the detailed design for the manufacturing of the mechanical system for wireless communications and the power generation module. Another emphasis for the quarter was the development of the surface system and acoustic detector for the downhole tool for 2 way communications. The tasks accomplished during this report period were: (1) All detailed drawings for manufacturing of the wireless communications gauge and power generator were completed and the drawings were forward to a machine shop for manufacturing. (2) The power generator was incorporated to the mandrel of the wireless gauge reducing the length of the tool by 25% and manufacturing cost by about 35%. (3) The new piezoelectric acoustic generator was manufactured successfully and it was delivered during this quarter. The assembly provides a new technique to manufacture large diameter piezoelectric based acoustic generators. (4) The acoustic two-way communications development progressed significantly. The real time firmware for the surface system was developed and the processor was able to detect and process the data frame transmitted from downhole. The analog section of the tool was also developed and it is being tested for filtering capabilities and signal detection and amplification. (5) The new transformer to drive the piezoelectric wafer assembly was designed and manufactured. The transformer has been received and it will go through testing and evaluation during the next quarter.

  15. IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 17, NO. 2, MAY 2002 243 Allocation of the Reactive Power Support

    E-Print Network [OSTI]

    Gross, George

    of losses. The formulation leads to a nat- ural allocation as a function of the amount of each transactionIEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 17, NO. 2, MAY 2002 243 Allocation of the Reactive Power, IEEE, and Shu Tao Abstract--This paper presents a new physical-flow-based mech- anism for allocating

  16. ANL-85-51 ANL-85-51 FLOW-INDUCED VIBRATION OF CIRCULAR CYLINDRICAL...

    Office of Scientific and Technical Information (OSTI)

    Vibration on Fretting in Shell and Tube Heat Exchangers," Flow- Induced Vibration of Power Plant Components PVP-41, pp. 1-18, 1980, Table 1. Permission granted by the American...

  17. Analytical and Experimental Study of Annular Two-Phase Flow Friction Pressure Drop Under Microgravity 

    E-Print Network [OSTI]

    Nguyen, Ngoc Thanh

    2011-02-22

    current single-phase systems due to reductions in system size, weight and power consumption. The mechanisms of pressure drop, heat transfer coefficients, void fractions, and flow regimes must be well understood under microgravity conditions in order...

  18. RIS-M-2357 MULTILEVEL FLOW MODELLING OF PROCESS

    E-Print Network [OSTI]

    to the computer and the plant operator. INIS Descriptors: AUTOMATION; CONSERVATION LAWS; CONTROL SYS- TEMS; ENERGY BALANCE; FLOW MODELS; INDUSTRIAL PLANTS; MASS BALANCE; NUCLEAR POWER PLANTS; PLANNING; REACTOR OPERATION 24 REFERENCES 25 #12;#12;- 5 - INTRODUCTION The operation of large industrial installations

  19. Nonpremixed Combustion in an Accelerating Turning Transonic Flow Undergoing Transition

    E-Print Network [OSTI]

    Liu, Feng

    burning fuel in the turbine stages. For the ground-based gas turbine, benefits have been shown to occur the turbine passage offer, therefore, an opportunity for a major technological improvement. The gas turbine the range of engine operation. Since the flow in a turbine passage is accelerating and power is extracted

  20. Fuel Cell Assembly Process Flow for High Productivity

    E-Print Network [OSTI]

    Edwards, David A.

    Fuel Cell Assembly Process Flow for High Productivity Problem Presenter Ram Ramanan Bloom Energy: Introduction Bloom Energy manufactures power modules based on fuel cell technology. These are built up their possible placement within a cell assembly. Currently, these rules for assembling the basic components

  1. Convective flow of sisko fluid over a bidirectional stretching sheet

    E-Print Network [OSTI]

    Munir, Asif; Khan, Masood

    2014-01-01

    The present investigation discusses the flow and heat transfer characteristics of a steady three dimensional Sisko fluid. The flow is induced due to bidirectional stretching sheet. The influence of power-law index and stretching ratio on flow and heat transfer is studied thoroughly. Governing partial differential equations are reduced to coupled ordinary differential equations by suitable similarity variable. The resulting equations are then solved numerically by shooting method using adaptive Runge Kutta algorithm in combination with Broyden's method in the domain . The numerical results for the velocity and temperature fields are graphically presented and effects of the relevant parameters are discussed in detail. Moreover, the skin-friction coefficient and local Nusselt number for different values of the power-law index and stretching ratio are presented through tabulated data. The numerical results are verified with the results obtained by HAM. Additionally, the results are also validated with previously ...

  2. KC-135 zero-gravity two-phase flow pressure drop experiments and modelling 

    E-Print Network [OSTI]

    Lambert, Anne

    1990-01-01

    mass, size, and pumping power requireinents. Knowledge of flow regime transitions, heat transfer characteristics, and pressure drop correlations is necessary to adequately design and develop two-phase systems. This work is concerned with two-phase... to reduce the overall system mass, size, and pumping power requirements. These advantages are realized because two-phase systems require lower mass flux for the same heat transfer capability. Knowledge of flow regime uansitions, heat transfer...

  3. Electric power 2007

    SciTech Connect (OSTI)

    2007-07-01

    Subjects covered include: power industry trends - near term fuel strategies - price/quality/delivery/opportunity; generating fleet optimization and plant optimization; power plant safety and security; coal power plants - upgrades and new capacity; IGCC, advanced combustion and CO{sub 2} capture technologies; gas turbine and combined cycle power plants; nuclear power; renewable power; plant operations and maintenance; power plant components - design and operation; environmental; regulatory issues, strategies and technologies; and advanced energy strategies and technologies. The presentations are in pdf format.

  4. Flow Characteristics Analysis of Widows' Creek Type Control Valve for Steam Turbine Control

    SciTech Connect (OSTI)

    Yoo, Yong H.; Sohn, Myoung S.; Suh, Kune Y.

    2006-07-01

    The steam turbine converts the kinetic energy of steam to mechanical energy of rotor blades in the power conversion system of fossil and nuclear power plants. The electric output from the generator of which the rotor is coupled with that of the steam turbine depends on the rotation velocity of the steam turbine bucket. The rotation velocity is proportional to the mass flow rate of steam entering the steam turbine through valves and nozzles. Thus, it is very important to control the steam mass flow rate for the load following operation of power plants. Among various valves that control the steam turbine, the control valve is most significant. The steam flow rate is determined by the area formed by the stem disk and the seat of the control valve. While the ideal control valve linearly controls the steam mass flow rate with its stem lift, the real control valve has various flow characteristic curves pursuant to the stem lift type. Thus, flow characteristic curves are needed to precisely design the control valves manufactured for the operating conditions of nuclear power plants. OMEGA (Optimized Multidimensional Experiment Geometric Apparatus) was built to experimentally study the flow characteristics of steam flowing inside the control valve. The Widows' Creek type control valve was selected for reference. Air was selected as the working fluid in the OMEGA loop to exclude the condensation effect in this simplified approach. Flow characteristic curves were plotted by calculating the ratio of the measured mass flow rate versus the theoretical mass flow rate of the air. The flow characteristic curves are expected to be utilized to accurately design and operate the control valve for fossil as well as nuclear plants. (authors)

  5. Supercritical flow in rectangular expansions 

    E-Print Network [OSTI]

    Walsh, Peter.

    1968-01-01

    In recent years the occasions for design of channels to contain supercritical flow has increased considerably. Consequently there has developed a need for a method of predicting the physical characteristics of such flow based on theory...

  6. Radial flow pulse jet mixer

    DOE Patents [OSTI]

    VanOsdol, John G.

    2013-06-25

    The disclosure provides a pulse jet mixing vessel for mixing a plurality of solid particles. The pulse jet mixing vessel is comprised of a sludge basin, a flow surface surrounding the sludge basin, and a downcoming flow annulus between the flow surface and an inner shroud. The pulse jet mixing vessel is additionally comprised of an upper vessel pressurization volume in fluid communication with the downcoming flow annulus, and an inner shroud surge volume separated from the downcoming flow annulus by the inner shroud. When the solid particles are resting on the sludge basin and a fluid such as water is atop the particles and extending into the downcoming flow annulus and the inner shroud surge volume, mixing occurs by pressurization of the upper vessel pressurization volume, generating an inward radial flow over the flow surface and an upwash jet at the center of the sludge basin.

  7. HYDROLYZED WOOD SLURRY FLOW MODELING

    E-Print Network [OSTI]

    Wrathall, Jim

    2012-01-01

    LBL-10090 UC-61 HYDROLYZED WOOD SLURRY FLOW MODELING JimLBL-10090 HYDROLYZED WOOD SLURRY FLOW MODELING Jim Wrathallconversion of hydrolyzed wood slurry to fuel oil, Based on

  8. Effects of Large Energetic Vortices on Axial-Flow Hydrokinetic Turbines B. Gunawan1

    E-Print Network [OSTI]

    Siefert, Chris

    Effects of Large Energetic Vortices on Axial-Flow Hydrokinetic Turbines B. Gunawan1 , V.S. Neary1 C production in a model MHK turbine. Results show that the power generated by the turbine is significantly at the centerline of the energy extraction plane, or axial-flow turbine hub elevation, provide high resolution

  9. Co-Flow Jet Airfoil Trade Study Part I : Energy Consumption and Aerodynamic Efficiency

    E-Print Network [OSTI]

    Zha, Gecheng

    Co-Flow Jet Airfoil Trade Study Part I : Energy Consumption and Aerodynamic Efficiency Alexis airfoils. A trade study is performed for a series of CFJ airfoils based on the NACA 23121 airfoil Static pressure Air density m Mass flow M Mach number Pitching Moment P Pumping power Free stream

  10. Using Traffic Flow for Cluster Formation in Vehicular Ad-hoc Networks

    E-Print Network [OSTI]

    Weigle, Michele

    Using Traffic Flow for Cluster Formation in Vehicular Ad-hoc Networks Mohammad S. Almalag of the traffic will flow. I. INTRODUCTION Vehicular Ad Hoc Networks (VANETs) are considered to be a class MANETs. Nodes in VANETs have more processing power and storage space and typically have no battery

  11. Ferrocyanide Safety Program: Waste tank sludge rheology within a hot spot or during draining. Homogeneous flow versus flow through a porous medium

    SciTech Connect (OSTI)

    Fauske, H.K. [Fauske and Associates, Inc., Burr Ridge, IL (United States); Cash, R.J. [Westinghouse Hanford Co., Richland, WA (United States)

    1993-11-01

    The conditions under which ferrocyanide waste sludge flows as a homogeneous non-Newtonian two-phase (solid precipitate-liquid) mixture rather than as a liquid through a porous medium (of stationary precipitate) are examined theoretically, based on the notion that the preferred rheological behavior of the sludge is the one which imposes the least resistance to the sludge flow. The homogeneous two-phase mixture is modeled as a power-law fluid and simple criteria are derived that show that the homogeneous power-law sludge-flow is a much more likely flow situation than the porous medium model of sludge flow. The implication of this finding is that the formation of a hot spot or the drainage of sludge from a waste tank are not likely to result in the uncovering (drying) and subsequent potential overheating of the reactive-solid component of the sludge.

  12. Ricci flow and quantum theory

    E-Print Network [OSTI]

    Robert Carroll

    2007-11-05

    We show some relations between Ricci flow and quantum theory via Fisher information and the quantum potential.

  13. Flow dynamics of the Moon

    E-Print Network [OSTI]

    Yu. N. Bratkov

    2010-04-03

    Flow analysis of big basins is given. Internal structure of flows is considered. Correlations between flows are calculated. For example, Mare Orientale is a moving basin. Orientale and Imbrium continental basins are introduced and are considered. Olbers ray crater is a result of precise interaction of the two basins. Flows of the Tycho type are studied. Two Antarctidae, an Indian Ocean, and an America are demonstrated.

  14. Innovation flow through social networks: Productivity distribution

    E-Print Network [OSTI]

    T. Di Matteo; T. Aste; M. Gallegati

    2004-06-19

    A detailed empirical analysis of the productivity of non financial firms across several countries and years shows that productivity follows a non-Gaussian distribution with power law tails. We demonstrate that these empirical findings can be interpreted as consequence of a mechanism of exchanges in a social network where firms improve their productivity by direct innovation or/and by imitation of other firm's technological and organizational solutions. The type of network-connectivity determines how fast and how efficiently information can diffuse and how quickly innovation will permeate or behaviors will be imitated. From a model for innovation flow through a complex network we obtain that the expectation values of the productivity level are proportional to the connectivity of the network of links between firms. The comparison with the empirical distributions reveals that such a network must be of a scale-free type with a power-law degree distribution in the large connectivity range.

  15. TEP process flow diagram

    SciTech Connect (OSTI)

    Wilms, R Scott; Carlson, Bryan; Coons, James; Kubic, William

    2008-01-01

    This presentation describes the development of the proposed Process Flow Diagram (PFD) for the Tokamak Exhaust Processing System (TEP) of ITER. A brief review of design efforts leading up to the PFD is followed by a description of the hydrogen-like, air-like, and waterlike processes. Two new design values are described; the mostcommon and most-demanding design values. The proposed PFD is shown to meet specifications under the most-common and mostdemanding design values.

  16. A Holistic Framework for Environmental Flows Determination in Hydropower Contexts

    SciTech Connect (OSTI)

    McManamay, Ryan A; Bevelhimer, Mark S

    2013-05-01

    Among the ecological science community, the consensus view is that the natural flow regime sustains the ecological integrity of river systems. This prevailing viewpoint by many environmental stakeholders has progressively led to increased pressure on hydropower dam owners to change plant operations to affect downstream river flows with the intention of providing better conditions for aquatic biological communities. Identifying the neccessary magnitude, frequency, duration, timing, or rate of change of stream flows to meet ecological needs in a hydropower context is challenging because the ecological responses to changes in flows may not be fully known, there are usually a multitude of competing users of flow, and implementing environmental flows usually comes at a price to energy production. Realistically, hydropower managers must develop a reduced set of goals that provide the most benefit to the identified ecological needs. As a part of the Department of Energy (DOE) Water Power Program, the Instream Flow Project (IFP) was carried out by Oak Ridge National Laboratory (ORNL), Pacific Northwest National Laboratory (PNNL), and Argon National Laboratory (ANL) as an attempt to develop tools aimed at defining environmental flow needs for hydropower operations. The application of these tools ranges from national to site-specific scales; thus, the utility of each tool will depend on various phases of the environmental flow process. Given the complexity and sheer volume of applications used to determine environmentally acceptable flows for hydropower, a framework is needed to organize efforts into a staged process dependent upon spatial, temporal, and functional attributes. By far, the predominant domain for determining environmental flows related to hydropower is within the Federal Energy Regulatory Commission (FERC) relicensing process. This process can take multiple years and can be very expensive depending on the scale of each hydropower project. The utility of such a framework is that it can expedite the environmental flow process by 1) organizing data and applications to identify predictable relationships between flows and ecology, and 2) suggesting when and where tools should be used in the environmental flow process. In addition to regulatory procedures, a framework should also provide the coordination for a comprehensive research agenda to guide the science of environmental flows. This research program has further reaching benefits than just environmental flow determination by providing modeling applications, data, and geospatial layers to inform potential hydropower development. We address several objectives within this document that highlight the limitations of existing environmental flow paradigms and their applications to hydropower while presenting a new framework catered towards hydropower needs. Herein, we address the following objectives: 1) Provide a brief overview of the Natural Flow Regime paradigm and existing environmental flow frameworks that have been used to determine ecologically sensitive stream flows for hydropower operations. 2) Describe a new conceptual framework to aid in determining flows needed to meet ecological objectives with regard to hydropower operations. The framework is centralized around determining predictable relationships between flow and ecological responses. 3) Provide evidence of how efforts from ORNL, PNNL, and ANL have filled some of the gaps in this broader framework, and suggest how the framework can be used to set the stage for a research agenda for environmental flow.

  17. Solar powered dehumidifier apparatus

    DOE Patents [OSTI]

    Jebens, Robert W. (Skillman, NJ)

    1980-12-30

    A thermally insulated light transmitting housing forms a chamber containing a desiccant and having a first gas port open to the ambient and a second gas port connected by a two way valve to a volume to be dried. Solar energy transmitted through the housing heats and dries the desiccant. The increased air pressure due to the heating of the volume to be dried causes the air from the volume to be expelled through the valve into the chamber. The desiccant is then cooled by shielding it from solar energy before the volume cools thereby increasing its moisture absorbing capacity. Then the volume is allowed to cool drawing dehumidified air through the desiccant and the valve into the volume to be dried. This cycle is then repeated.

  18. Convective heat flow probe

    DOE Patents [OSTI]

    Dunn, J.C.; Hardee, H.C.; Striker, R.P.

    1984-01-09

    A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.

  19. Microgravity Flow Regime Transition Modeling 

    E-Print Network [OSTI]

    Shephard, Adam M.

    2010-07-14

    Flow regime transitions and the modeling thereof underlie the design of microgravity two-phase systems. Through the use of the zero-g laboratory, microgravity two-phase flows can be studied. Because microgravity two-phase flows exhibit essentially...

  20. Interfacial colloidal monolayers under steady shear: structure and flow profiles

    E-Print Network [OSTI]

    Ivo Buttinoni; Zachary A. Zell; Todd M. Squires; Lucio Isa

    2015-09-11

    We study the coupling between the structural dynamics and rheological response of charged colloidal monolayers at water/oil interfaces, driven into steady shear by a microdisk rotating at a controlled angular velocity. The flow causes particles to layer into rotating concentric rings linked to the local, position-dependent shear rate, which triggers two distinct dynamical regimes: particles move continuously "Flowing") close to the microdisk, or exhibit intermittent "Hopping" between local energy minima farther away. The shear-rate dependent surface viscosity of a monolayer can be extracted from an interfacial stress balance, giving "macroscopic" flow curves whose behavior corresponds to the distinct microscopic regimes of particle motion. Hopping Regions correspond to a surface yield stress $\\eta \\sim \\tau_S^Y \\dot{\\gamma}^{-1}$, whereas Flowing Regions exhibit surface viscosities with power-law shear-thinning characteristics.

  1. High-bandwidth continuous-flow arc furnace

    DOE Patents [OSTI]

    Hardt, D.E.; Lee, S.G.

    1996-08-06

    A high-bandwidth continuous-flow arc furnace for stream welding applications includes a metal mass contained in a crucible having an orifice. A power source charges an electrode for generating an arc between the electrode and the mass. The arc heats the metal mass to a molten state. A pressurized gas source propels the molten metal mass through the crucible orifice in a continuous stream. As the metal is ejected, a metal feeder replenishes the molten metal bath. A control system regulates the electrode current, shielding gas pressure, and metal source to provide a continuous flow of molten metal at the crucible orifice. Independent control over the electrode current and shield gas pressure decouples the metal flow temperature and the molten metal flow rate, improving control over resultant weld characteristics. 4 figs.

  2. Interfacial colloidal monolayers under steady shear: structure and flow profiles

    E-Print Network [OSTI]

    Ivo Buttinoni; Zachary A. Zell; Todd M. Squires; Lucio Isa

    2015-04-01

    We study the coupling between the structural dynamics and rheological response of charged colloidal monolayers at water/oil interfaces, driven into steady shear by a microdisk rotating at a controlled angular velocity. The flow causes particles to layer into rotating concentric rings linked to the local, position-dependent shear rate, which triggers two distinct dynamical regimes: particles move continuously "Flowing") close to the microdisk, or exhibit intermittent "Hopping" between local energy minima farther away. The shear-rate dependent surface viscosity of a monolayer can be extracted from an interfacial stress balance, giving "macroscopic" flow curves whose behavior corresponds to the distinct microscopic regimes of particle motion. Hopping Regions correspond to a surface yield stress $\\eta \\sim \\tau_S^Y \\dot{\\gamma}^{-1}$, whereas Flowing Regions exhibit surface viscosities with power-law shear-thinning characteristics.

  3. High-bandwidth continuous-flow arc furnace

    DOE Patents [OSTI]

    Hardt, David E. (Concord, MA); Lee, Steven G. (Ann Arbor, MI)

    1996-01-01

    A high-bandwidth continuous-flow arc furnace for stream welding applications includes a metal mass contained in a crucible having an orifice. A power source charges an electrode for generating an arc between the electrode and the mass. The arc heats the metal mass to a molten state. A pressurized gas source propels the molten metal mass through the crucible orifice in a continuous stream. As the metal is ejected, a metal feeder replenishes the molten metal bath. A control system regulates the electrode current, shielding gas pressure, and metal source to provide a continuous flow of molten metal at the crucible orifice. Independent control over the electrode current and shield gas pressure decouples the metal flow temperature and the molten metal flow rate, improving control over resultant weld characteristics.

  4. Modeling shrouded stator cavity flows in axial-flow compressors

    SciTech Connect (OSTI)

    Wellborn, S.R.; Tolchinsky, I.; Okiishi, T.H.

    2000-01-01

    Experiments and computational analyses were completed to understand the nature of shrouded stator cavity flows. From this understanding, a one-dimensional model of the flow through shrouded stator cavities was developed. This model estimates the leakage mass flow, temperature rise, and angular momentum increase through the cavity, given geometry parameters and the flow conditions at the interface between the cavity and primary flow path. This cavity model consists of two components, one that estimates the flow characteristics through the labyrinth seals and the other that predicts the transfer of momentum due to windage. A description of the one-dimensional model is given. The incorporation and use of the one-dimensional model in a multistage compressor primary flow analysis tool is described. The combination of this model and the primary flow solver was used to reliably simulate the significant impact on performance of the increase of hub seal leakage in a twelve-stage axial-flow compressor. Observed higher temperatures of the hub region fluid, different stage matching, and lower overall efficiencies and core flow than expected could be correctly linked to increased hub seal clearance with this new technique. The importance of including these leakage flows in compressor simulations is shown.

  5. A network approach for power grid robustness against cascading failures

    E-Print Network [OSTI]

    Wang, Xiangrong; Kooij, Robert E; Van Mieghem, Piet

    2015-01-01

    Cascading failures are one of the main reasons for blackouts in electrical power grids. Stable power supply requires a robust design of the power grid topology. Currently, the impact of the grid structure on the grid robustness is mainly assessed by purely topological metrics, that fail to capture the fundamental properties of the electrical power grids such as power flow allocation according to Kirchhoff's laws. This paper deploys the effective graph resistance as a metric to relate the topology of a grid to its robustness against cascading failures. Specifically, the effective graph resistance is deployed as a metric for network expansions (by means of transmission line additions) of an existing power grid. Four strategies based on network properties are investigated to optimize the effective graph resistance, accordingly to improve the robustness, of a given power grid at a low computational complexity. Experimental results suggest the existence of Braess's paradox in power grids: bringing an additional li...

  6. Primus Power's Flow Battery Powered by $11 Million in Private Investment

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: Alternative FuelsofProgram: Report Appendices | Department of EnergyDepartmentREPORT|

  7. Flow-Force Compensation in a Hydraulic Valve

    E-Print Network [OSTI]

    Lugowski, Jan

    2015-01-01

    Flow-reaction forces acting in hydraulic valves have been studied for many decades. Despite this, they are difficult to account for due to the complexities of the jet flow. This paper focuses only on the reduction, also referred to as compensation, of the flow force as applied to a valve spool featuring a profile of a turbine bucket. Fluid power textbooks explain the compensation taking place on such a profile by applying Newton laws of motion to the profile and deliver an equation for the magnitude and the direction of the flow force. This paper shows that both the magnitude and the direction of the compensating flow force are incorrect if calculated from the textbook equation. A corrected analysis of the dynamic forces is presented that are in agreement with earlier experiments by this author. It follows that the compensating flow force should be calculated from the static-pressure imbalance on the spool profile. That is, not Newton but Pascal law should be applied to calculate the compensating flow force.

  8. Some parametric flow analyses of a particle bed fuel element

    SciTech Connect (OSTI)

    Dobranich, D.

    1993-05-01

    Parametric calculations are performed, using the SAFSIM computer program, to investigate the fluid mechanics and heat transfer performance of a particle bed fuel element. Both steady-state and transient calculations are included, addressing such issues as flow stability, reduced thrust operation, transpiration drag, coolant conductivity enhancement, flow maldistributions, decay heat removal, flow perturbations, and pulse cooling. The calculations demonstrate the dependence of the predicted results on the modeling assumptions and thus provide guidance as to where further experimental and computational investigations are needed. The calculations also demonstrate that both flow instability and flow maldistribution in the fuel element are important phenomena. Furthermore, results are encouraging that geometric design changes to the element can significantly reduce problems related to these phenomena, allowing improved performance over a wide range of element power densities and flow rates. Such design changes will help to maximize the operational efficiency of space propulsion reactors employing particle bed fuel element technology. Finally, the results demonstrate that SAFSIM is a valuable engineering tool for performing quick and inexpensive parametric simulations addressing complex flow problems.

  9. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01

    are many solar photovoltaic power plants internationally andUSA, Blythe, CA Solar electric power plant, Blythe USA, SanTX Blue Wing solar electric power plant USA, Jacksonville,

  10. ELECTROCHEMICAL POWER FOR TRANSPORTATION

    E-Print Network [OSTI]

    Cairns, Elton J.

    2012-01-01

    Energy Requirements for Electric Cars and Their Impact on Power Generation andof energy resource utilization for electric power generationElectric automobile energy consumption. Effect of electric automobiles on the electric power generation

  11. Uncertainty in BWR power during ATWS events

    SciTech Connect (OSTI)

    Diamond, D.J.

    1986-01-01

    A study was undertaken to improve our understanding of BWR conditions following the closure of main steam isolation valves and the failure of reactor trip. Of particular interest was the power during the period when the core had reached a quasi-equilibrium condition with a natural circulation flow rate determined by the water level in the downcomer. Insights into the uncertainity in the calculation of this power with sophisticated computer codes were quantified using a simple model which relates power to the principal thermal-hydraulic variables and reactivity coefficients; the latter representing the link between the thermal-hydraulics and the neutronics. Assumptions regarding the uncertainty in these variables and coefficients were then used to determine the uncertainty in power.

  12. Random excitation forces in tube bundles subjected to two-phase cross-flow

    SciTech Connect (OSTI)

    Taylor, C.E.; Pettigrew, M.J. [AECL Research, Chalk River, Ontario (Canada). Chalk River Labs.; Currie, I.G. [Univ. of Toronto, Ontario (Canada). Dept. of Mechanical Engineering

    1996-08-01

    Data from two experimental programs have been analyzed to determine the characteristics of the random excitation forces associated with two-phase cross-flow in tube bundles. Large-scale air-water flow loops in France and Canada were used to generate the data. Tests were carried out on cantilevered, clamped-pinned, and clamped-clamped tubes in normal-square, parallel-triangular, and normal-triangular configurations. Either strain gages or force transducers were used to measure the vibration response of a centrally located tube as the tue array was subjected to a wide range of void fractions and flow rates. Power spectra were analyzed to determine the effect of parameters such as tube diameter, frequency, flow rate, void fraction, and flow regime on the random excitation forces. Normalized expressions for the excitation force power spectra were found to be flow-regime dependent. In the churn flow regime, flow rate and void fraction had very little effect on the magnitude of the excitation forces. In the bubble-plug flow regime, the excitation forces increased rapidly with flow rate and void fraction.

  13. Performance Evaluation of Flocking-Based Distributed Cyber-Physical Control for Smart Grid

    E-Print Network [OSTI]

    Kundur, Deepa

    generation, transmission and delivery. The two way information and power flow facilitated in smart grid proposed to stabilize power systems during transient insta- bility. The flocking paradigm offers a rich, communication sys- tems and control to help improve the efficiency, reliability and resilience of power

  14. The Economic Implications of Adding Wind Capacity to a Bulk Power Transmission Network

    E-Print Network [OSTI]

    The Economic Implications of Adding Wind Capacity to a Bulk Power Transmission Network by Tim Mount. * Corresponding author, tdm2@cornell.edu. #12;2 The Economic Implications of Adding Wind Capacity to a Bulk Power limitations of solving large AC Optimal Power Flows (OPF) for real networks, system operators typically use

  15. Abstract--Distributed generation (DG) has brought great attention from the power community, especially

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    generation and DFACTS (distribution network Flexible AC Transmission System). In these researches and penetration of DG is affecting power flow of the networks and Distributed FACTS (DFACTS) devices and centralized power stations connected to high and extra- high voltage networks, which in turn, supply power

  16. rom the beginning of time, the power of water has captured the human imagination and influenced

    E-Print Network [OSTI]

    the mighty Colorado River -- providing hydro-electrical power to millions of people. It also canF rom the beginning of time, the power of water has captured the human imagination and influenced the power of flowing water across a road! It's an incredibly senseless way to die and is completely

  17. June 14-15, 2006/ARR ARIES-CS Power Core Engineering

    E-Print Network [OSTI]

    Raffray, A. René

    only (MW) 17.66 #12;June 14-15, 2006/ARR 5 FIRST WALL Total Surface Power to FW (MW) 363.5 AverageJune 14-15, 2006/ARR 1 ARIES-CS Power Core Engineering: Updating Power Flow, Blanket and Divertor Pneutron Pa Pa,loss Divertor FirstWall (includingspeciala modulesifpresent) Prad,chamb Pparticle 80% 20

  18. ELEN9501: Electrical Power Networks Name: Xiangying Qian UNI: xq2120 Final Report

    E-Print Network [OSTI]

    Lavaei, Javad

    prices resulting from an optimal power flow performed by a centralized dispatcher, e.g. Independent is the produced power and a, b and c are constants. The quadratic cost functions enable the OPF problemELEN9501: Electrical Power Networks Name: Xiangying Qian UNI: xq2120 1 Final Report 1. Literature

  19. Electrolytes for power sources

    DOE Patents [OSTI]

    Doddapaneni, N.; Ingersoll, D.

    1995-01-03

    Electrolytes are disclosed for power sources, particularly alkaline and acidic power sources, comprising benzene polysulfonic acids and benzene polyphosphonic acids or salts of such acids. 7 figures.

  20. Electrolytes for power sources

    DOE Patents [OSTI]

    Doddapaneni, Narayan (Albuquerque, NM); Ingersoll, David (Albuquerque, NM)

    1995-01-01

    Electrolytes for power sources, particularly alkaline and acidic power sources, comprising benzene polysulfonic acids and benzene polyphosphonic acids or salts of such acids.

  1. Wind Power Link

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Wind Power Links These other web sites may provide additional information of interest: American Wind Energy Association Idaho Department of Energy Wind Power Information Utah...

  2. Bonneville Power Administration

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    agreement (Agreement) between the BC Hydro and Power uthority (BCH) and the Bonneville Power Administration (BP A), jointly the Parties, which BA for accounting purposes is...

  3. BONNEVILLE POWER ADMINISTRATION

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    October 2013 (Revised 060914) United States Department of Energy Bonneville Power Administration 905 N.E. 11th Avenue Portland, OR 97232 Bonneville Power Administration's 2014...

  4. Fusion Power Associates Awards

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Fusion Power Associates Awards Fusion Power Associates is "a non-profit, tax-exempt research and educational foundation, providing information on the status of fusion development...

  5. High Power, Linear CMOS Power Amplifier for WLAN Applications /

    E-Print Network [OSTI]

    Afsahi, Ali

    2013-01-01

    Power ampli?er (PA)2x2 Chapter 5 Power Combining5.1 Wilkinson Power Combiner . . . . . . . . . . . .

  6. Flow Battery Technology

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HABFES OctoberEvanServices »First ObservationFast(ER1)Flow Battery

  7. Magnetospheric structure of rotation powered pulsars

    SciTech Connect (OSTI)

    Arons, J. (California Univ., Berkeley, CA (USA) California Univ., Livermore, CA (USA). Inst. of Geophysics and Planetary Physics)

    1991-01-07

    I survey recent theoretical work on the structure of the magnetospheres of rotation powered pulsars, within the observational constraints set by their observed spindown, their ability to power synchrotron nebulae and their ability to produce beamed collective radio emission, while putting only a small fraction of their energy into incoherent X- and gamma radiation. I find no single theory has yet given a consistent description of the magnetosphere, but I conclude that models based on a dense outflow of pairs from the polar caps, permeated by a lower density flow of heavy ions, are the most promising avenue for future research. 106 refs., 4 figs., 2 tabs.

  8. Electrokinetic Power Generation from Liquid Water Microjets

    SciTech Connect (OSTI)

    Duffin, Andrew M.; Saykally, Richard J.

    2008-02-15

    Although electrokinetic effects are not new, only recently have they been investigated for possible use in energy conversion devices. We have recently reported the electrokinetic generation of molecular hydrogen from rapidly flowing liquid water microjets [Duffin et al. JPCC 2007, 111, 12031]. Here, we describe the use of liquid water microjets for direct conversion of electrokinetic energy to electrical power. Previous studies of electrokinetic power production have reported low efficiencies ({approx}3%), limited by back conduction of ions at the surface and in the bulk liquid. Liquid microjets eliminate energy dissipation due to back conduction and, measuring only at the jet target, yield conversion efficiencies exceeding 10%.

  9. Polk power station syngas cooling system

    SciTech Connect (OSTI)

    Jenkins, S.D.

    1995-01-01

    Tampa Electric Company (TEC) is in the site development and construction phase of the new Polk Power Station Unit No. 1. This will be the first unit at a new site and will use Integrated Gasification Combined Cycle (IGCC) Technology. The unit will utilize Texaco`s oxygen-blown, entrained-flow coal gasification, along with combined cycle power generation, to produce nominal 260MW. Integral to the gasification process is the syngas cooling system. The design, integration, fabrication, transportation, and erection of this equipment have provided and continue to provide major challenges for this project.

  10. Karnataka Power Corporation Limited and National Thermal Power...

    Open Energy Info (EERE)

    Karnataka Power Corporation Limited and National Thermal Power Corporation JV Jump to: navigation, search Name: Karnataka Power Corporation Limited and National Thermal Power...

  11. Assessment of Combined Heat and Power Premium Power Applications...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Combined Heat and Power Premium Power Applications in California, September 2008 Assessment of Combined Heat and Power Premium Power Applications in California, September 2008 This...

  12. Flex power perspectives of indirect power system control through...

    Open Energy Info (EERE)

    Flex power perspectives of indirect power system control through dynamic power price (Smart Grid Project) Jump to: navigation, search Project Name Flex power perspectives of...

  13. Electron flow stability in magnetically insulated vacuum transmission lines

    SciTech Connect (OSTI)

    Rose, D. V.; Genoni, T. C.; Clark, R. E.; Welch, D. R. [Voss Scientific, LLC, Albuquerque, New Mexico 87108 (United States); Stygar, W. A. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

    2011-03-15

    We evaluate the stability of electron current flow in high-power magnetically insulated transmission lines (MITLs). A detailed model of electron flow in cross-field gaps yields a dispersion relation for electromagnetic (EM) transverse magnetic waves [R. C. Davidson et al., Phys. Fluids 27, 2332 (1984)] which is solved numerically to obtain growth rates for unstable modes in various sheath profiles. These results are compared with two-dimensional (2D) EM particle-in-cell (PIC) simulations of electron flow in high-power MITLs. We find that the macroscopic properties (charge and current densities and self-fields) of the equilibrium profiles observed in the simulations are well represented by the laminar-flow model of Davidson et al. Idealized simulations of sheared flow in electron sheaths yield growth rates for both long (diocotron) and short (magnetron) wavelength instabilities that are in good agreement with the dispersion analysis. We conclude that electron sheaths that evolve self-consistently from space-charged-limited emission of electrons from the cathode in well-resolved 2D EM PIC simulations form stable profiles.

  14. Electron flow stability in magnetically insulated vacuum transmission lines.

    SciTech Connect (OSTI)

    Genoni, Thomas C. (Voss Scientific, LLC, Albuquerque, NM); Stygar, William A.; Welch, Dale Robert (Voss Scientific, LLC, Albuquerque, NM); Clark, R. E. (Voss Scientific, LLC, Albuquerque, NM); Rose, David V. (Voss Scientific, LLC, Albuquerque, NM)

    2010-11-01

    We evaluate the stability of electron current flow in high-power magnetically insulated transmission lines (MITLs). A detailed model of electron flow in cross-field gaps yields a dispersion relation for electromagnetic (EM) transverse magnetic waves [R. C. Davidson et al., Phys. Fluids 27, 2332 (1984)] which is solved numerically to obtain growth rates for unstable modes in various sheath profiles. These results are compared with two-dimensional (2D) EM particle-in-cell (PIC) simulations of electron flow in high-power MITLs. We find that the macroscopic properties (charge and current densities and self-fields) of the equilibrium profiles observed in the simulations are well represented by the laminar-flow model of Davidson et al. Idealized simulations of sheared flow in electron sheaths yield growth rates for both long (diocotron) and short (magnetron) wavelength instabilities that are in good agreement with the dispersion analysis. We conclude that electron sheaths that evolve self-consistently from space-charged-limited emission of electrons from the cathode in well-resolved 2D EM PIC simulations form stable profiles.

  15. Finsler geometric perspective on the bulk flow in the universe

    E-Print Network [OSTI]

    Zhe Chang; Ming-Hua Li; Sai Wang

    2013-05-09

    Astronomical observations showed that there may exist a bulk flow with peculiar velocities in the universe, which contradicts with the (\\Lambda)CDM model. The bulk flow reveals that the observational universe is anisotropic at large scales. In fact, a more reliable observation on the anisotropy of spacetime comes from the CMB power spectra. The WMAP and Planck satellites both show that there is a hemispherical power asymmetry at large-angular scales. In this paper, we propose a "wind" scenario to the bulk flow (or the anisotropy of spacetime). Under the influence of the "wind", the spacetime metric could become a Finsler structure. By resolving the null geodesic equation, we obtain the modified luminosity distance, which has a dipolar form at the leading order. Thus, the "wind" describes well the bulk flow. In addition, we perform a least-(\\chi^2) fit to the data of type Ia supernovae (SNe Ia) in the Union2.1 compilation. The peculiar velocity of the bulk flow has an upper limit (v_{bulk}\\lesssim 4000 \\rm{km/s}), which is compatible with all the existing observational values.

  16. Dynamic Pressure Improvements to Closed-Circuit Wind Tunnels with Flow Quality Analysis 

    E-Print Network [OSTI]

    Herring, Alexander

    2015-03-31

    Experiment Station Low-Speed Wind Tunnel (LSWT) was limited through available power to a dynamic pressure of 120 psf. The addition of a higher power motor, construction of a new, smaller test section, diffuser liners to prevent flow separation, and increased...

  17. Spiral Laminar Flow: A revolution in understanding?

    E-Print Network [OSTI]

    Greenaway, Alan

    Blood Flow Spiral laminar flow #12;Spiral flow in the Aorta (MRI) Computational Fluid Dynamics 0 10 20Spiral Laminar Flow: A revolution in understanding? Reintroduction of natural blood flow Laminar Flow through Runoff (3months) Proximal Anastomosis SLF TM Graft Distal Anastomosis Post-op Angios

  18. Radial flow heat exchanger

    DOE Patents [OSTI]

    Valenzuela, Javier (Hanover, NH)

    2001-01-01

    A radial flow heat exchanger (20) having a plurality of first passages (24) for transporting a first fluid (25) and a plurality of second passages (26) for transporting a second fluid (27). The first and second passages are arranged in stacked, alternating relationship, are separated from one another by relatively thin plates (30) and (32), and surround a central axis (22). The thickness of the first and second passages are selected so that the first and second fluids, respectively, are transported with laminar flow through the passages. To enhance thermal energy transfer between first and second passages, the latter are arranged so each first passage is in thermal communication with an associated second passage along substantially its entire length, and vice versa with respect to the second passages. The heat exchangers may be stacked to achieve a modular heat exchange assembly (300). Certain heat exchangers in the assembly may be designed slightly differently than other heat exchangers to address changes in fluid properties during transport through the heat exchanger, so as to enhance overall thermal effectiveness of the assembly.

  19. Fluid flow monitoring device

    DOE Patents [OSTI]

    McKay, M.D.; Sweeney, C.E.; Spangler, B.S. Jr.

    1993-11-30

    A flow meter and temperature measuring device are described comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips. 7 figures.

  20. Fluid flow monitoring device

    DOE Patents [OSTI]

    McKay, Mark D. (1426 Socastee Dr., North Augusta, SC 29841); Sweeney, Chad E. (3600 Westhampton Dr., Martinez, GA 30907-3036); Spangler, Jr., B. Samuel (2715 Margate Dr., Augusta, GA 30909)

    1993-01-01

    A flow meter and temperature measuring device comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips.

  1. Retail Demand Response in Southwest Power Pool

    E-Print Network [OSTI]

    Bharvirkar, Ranjit

    2009-01-01

    authorities, independent power producers, power marketers,Power Marketers Independent Power Producers Independent

  2. EIN Cash Flow Model

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: AlternativeCommunication3-E Wholesale Power Rate10 EECBGEERE AnnualInfographic EGSEIA CasesEIN

  3. Recent Progress in Redox Flow Battery Research and Development

    SciTech Connect (OSTI)

    Wang, Wei; Luo, Qingtao; Li, Bin; Wei, Xiaoliang; Li, Liyu; Yang, Zhenguo

    2013-02-20

    With the increase need to seamlessly integrate the renewable energy with the current grid which itself is evolving into a more intelligent, efficient, and capable electrical power system, it is envisioned that the energy storage system will play a more prominent role in bridging the gap between the current technology and a clean sustainable future in grid reliability and utilization. Redox flow battery technology is leading the way in this perspective in providing a well balanced approach for current challenges. Recent progress in the research and development of redox flow battery technology is reviewed here with a focus on new chemistries and systems.

  4. Complex groundwater flow systems as traveling agent models

    E-Print Network [OSTI]

    López-Corona, Oliver; Escolero, Oscar; González, Tomás; Morales-Casique, Eric

    2014-01-01

    Analyzing field data from pumping tests, we show that as with many other natural phenomena, groundwater flow exhibits a complex dynamics described by 1/f power spectrum. This result is theoretically studied within an agent perspective. Using a traveling agent model, we prove that this statistical behavior emerges when the medium is complex. Some heuristic reasoning is provided to justify both spatial and dynamic complexity, as the result of the superposition of an infinite number of stochastic processes. Even more, we show that this implies that non-Kolmogorovian probability is needed for its study, and provide a set of new partial differential equations for groundwater flow.

  5. System design description for GCFR-core flow test loop

    SciTech Connect (OSTI)

    Huntley, W.R.; Grindell, A.G.

    1980-12-01

    The Core Flow Test Loop is a high-pressure, high-temperature, out-of-reactor helium circulation system that is being constructed to permit detailed study of the thermomechanical and thermal performance at prototypic steady-state and transient operating conditions of simulated segments of core assemblies for a GCFR Demonstration Plant, as designed by General Atomic Company. It will also permit the expermental verification of predictive analytical models of the GCFR core assemblies needed to reduce operational and safety uncertainties of the GCFR. Full-sized blanket assemblies and segments of fuel rod and control rod fuel assemblies will be simulated with test bundles of electrically powered fuel rod or blanket rod simulators. The loop will provide the steady-state and margin test requirements of bundle power and heat removal, and of helium coolant flow rate, pressure, and temperature for test bundles having up to 91 rods; these requirements set the maximum power, coolant helium flow, and thermal requirements for the loop. However, the size of the test vessel that contains the test bundles will be determined by the bundles that simulate a full-sized GCFR blanket assembly. The loop will also provide for power and coolant transients to simulate transient operation of GCFR core assemblies, including the capability for rapid helium depressurization to simulate the depressurization class of GCFR accidents. In addition, the loop can be used as an out-of-reactor test bed for characterizing in-reactor test bundle configurations.

  6. Power Series Introduction

    E-Print Network [OSTI]

    Vickers, James

    Power Series 16.4 Introduction In this section we consider power series. These are examples of infinite series where each term contains a variable, x, raised to a positive integer power. We use the ratio test to obtain the radius of convergence R, of the power series and state the important result

  7. Offshore Wind Power USA

    Broader source: Energy.gov [DOE]

    The Offshore Wind Power USA conference provides the latest offshore wind market updates and forecasts.

  8. Active combustion flow modulation valve

    DOE Patents [OSTI]

    Hensel, John Peter; Black, Nathaniel; Thorton, Jimmy Dean; Vipperman, Jeffrey Stuart; Lambeth, David N; Clark, William W

    2013-09-24

    A flow modulation valve has a slidably translating hollow armature with at least one energizable coil wound around and fixably attached to the hollow armature. The energizable coil or coils are influenced by at least one permanent magnet surrounding the hollow armature and supported by an outer casing. Lorentz forces on the energizable coils which are translated to the hollow armature, increase or decrease the flow area to provide flow throttling action. The extent of hollow armature translation depends on the value of current supplied and the direction of translation depends on the direction of current flow. The compact nature of the flow modulation valve combined with the high forces afforded by the actuator design provide a flow modulation valve which is highly responsive to high-rate input control signals.

  9. Drains Debubbler Transport Liq. Flow

    E-Print Network [OSTI]

    Weber, Rodney

    Drains Debubbler Transport Liq. Flow (LiF) aq. Anion Cation Waste Vacuum Pump LiF H2 O Pure H2 O 1 Denuders Cyclon 16 L/min 2.5 µm cut Sample Tubing ColourFlow, mL/minTubing green/green-1 green/green-2, and Liquid Flow Rates Are Possible Cation: metrosep 2100B-100x4.0mm Eluent: 0.250g/L Dipicolinic acid 1000 u

  10. Elliptic Flow at Large Viscosity

    E-Print Network [OSTI]

    Volker Koch

    2009-09-18

    In this contribution we present an alternative scenario for the large elliptic flow observed in relativistic heavy ion collisions. Motivated by recent results from Lattice QCD on flavor off-diagonal susceptibilities we argue that the matter right above $T_{c}$ can be described by single-particle dynamics in a repulsive single-particle potential, which in turn gives rise to elliptic flow. These ideas can be tested experimentally by measuring elliptic flow of heavy quarks, preferably via the measurement of $J/\\Psi$ elliptic flow.

  11. Module bay with directed flow

    SciTech Connect (OSTI)

    Torczynski, John R. (Albuquerque, NM)

    2001-02-27

    A module bay requires less cleanroom airflow. A shaped gas inlet passage can allow cleanroom air into the module bay with flow velocity preferentially directed toward contaminant rich portions of a processing module in the module bay. Preferential gas flow direction can more efficiently purge contaminants from appropriate portions of the module bay, allowing a reduced cleanroom air flow rate for contaminant removal. A shelf extending from an air inlet slit in one wall of a module bay can direct air flowing therethrough toward contaminant-rich portions of the module bay, such as a junction between a lid and base of a processing module.

  12. Hybrid Power Test Bed

    SciTech Connect (OSTI)

    NONE

    1996-06-01

    This document describes efforts by the National Renewable Energy Laboratory to simulate hybrid power systems. Hybrid power systems combine multiple power sources such as wind turbines, photovoltaic (PV) arrays, diesel generators, and battery storage systems. They typically are used in remote areas, away from major electric grids. The Hybrid Power Test Bed is designed to assist the U.S. wind industry in developing and testing hybrid power generation systems. Test bed capabilities, features, and equipment are described.

  13. Kauai Groundwater Flow Model

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Nicole Lautze

    2015-01-01

    Groundwater flow model for Kauai. Data is from the following sources: Whittier, R. and A.I. El-Kadi. 2014. Human and Environmental Risk Ranking of Onsite Sewage Disposal Systems For the Hawaiian Islands of Kauai, Molokai, Maui, and Hawaii – Final. Prepared by the University of Hawaii, Dept. of Geology and Geophysics for the State of Hawaii Dept. of Health, Safe Drinking Water Branch. September 2014.; and Whittier, R.B., K. Rotzoll, S. Dhal, A.I. El-Kadi, C. Ray, G. Chen, and D. Chang. 2004. Hawaii Source Water Assessment Program Report – Volume IV – Island of Kauai Source Water Assessment Program Report. Prepared for the Hawaii Department of Health, Safe Drinking Water Branch. University of Hawaii, Water Resources Research Center. Updated 2015.

  14. PowerPoint Presentation

    Office of Environmental Management (EM)

    * Available monitoring data for the WIPP underground exhaust stream (radiological and flow) * Results from a 1998 series of particle releases within the WIPP underground Summary...

  15. PowerPoint Presentation

    Office of Environmental Management (EM)

    business in California. 150K (FY12)+ 1M (FY13-FY14). * Numerical simulation of fluid flow under Magneto-Hydro-Dynamic (MHD) influence. * International Collaborations....

  16. PowerPoint Presentation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    made from laser ablated plastic laminates - Selective bio-amplification - Magnetic valve system facilitate chamber communication - Commercial lateral flow assay - Integrated...

  17. PowerPoint Presentation

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    (g) & steam flow () Does the information improve (on average) our chances of drilling economic wells? Sum over all 7 steam categories Quantify probabilistic...

  18. PowerPoint Presentation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    effectiveness of evacuating high flows out of Oklahoma reservoirs. (have been using 60k cfs bench at Van Buren since October 2005) II - Improve navigation by deepening the...

  19. PowerPoint Presentation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    in rivers and tidal flow is crucial for the annual energy production estimation and structural design of MHK devices. * ADCP moving vessel deployments provide 3D velocity...

  20. Author's personal copy Two-way coupling of an ENSO model to the global climate model CLIMBER-3a

    E-Print Network [OSTI]

    Levermann, Anders

    it is possible to introduce ENSO variability to an Earth system Model of Intermediate Complexity (EMIC we are using here. In this study we couple the Earth system model of intermediate complexity (EMIC