National Library of Energy BETA

Sample records for duct burner fb

  1. ASU nitrogen sweep gas in hydrogen separation membrane for production of HRSG duct burner fuel

    DOE Patents [OSTI]

    Panuccio, Gregory J.; Raybold, Troy M.; Jamal, Agil; Drnevich, Raymond Francis

    2013-04-02

    The present invention relates to the use of low pressure N2 from an air separation unit (ASU) for use as a sweep gas in a hydrogen transport membrane (HTM) to increase syngas H2 recovery and make a near-atmospheric pressure (less than or equal to about 25 psia) fuel for supplemental firing in the heat recovery steam generator (HRSG) duct burner.

  2. Design and Evaluation of a High Temperature Burner Duct Recuperator System 

    E-Print Network [OSTI]

    Parks, W. P.; DeBellis, C. L.; Kneidel, K.

    1988-01-01

    "The Babcock & Wilcox Company (B&W) has completed a program to design, construct, install, and field test a ceramic-based high-temperature burner-duct-recuperator (HTBDR) in an industrial setting. The unit was capable of operating in corrosive, high...

  3. Startup burner

    DOE Patents [OSTI]

    Zhao, Jian Lian (Belmont, MA); Northrop, William F. (Ann Arbor, MI); Bosco, Timothy (Dallas, TX); Rizzo, Vincent (Norfolk, MA); Kim, Changsik (Lexington, MA)

    2009-08-18

    A startup burner for rapidly heating a catalyst in a reformer, as well as related methods and modules, is disclosed.

  4. FLAT FLAME BURNER ANALYSES

    E-Print Network [OSTI]

    Pagni, P.J.

    2012-01-01

    in Edge Cooled F1at Flame Burners," Combust. Sci. and Tech.Subscripts w water b burner ambient, upstream bondary ufor publication FLAT FLAME BURNER ANALYSES P. J. Pagni, A.

  5. Front Burner- Issue 14

    Broader source: Energy.gov [DOE]

    The Cybersecurity Front Burner Issue No. 14 addresses the 2013 National Cybersecurity Awareness Month (NCSAM) Campaign and Phishing Scams.

  6. Front Burner- Issue 15

    Broader source: Energy.gov [DOE]

    The Cybersecurity Front Burner Issue No. 15 addresses the DOE eSCRM Program and Secure Online Shopping.

  7. Rotary Burner Demonstration

    SciTech Connect (OSTI)

    Paul Flanagan

    2003-04-30

    The subject technology, the Calcpos Rotary Burner (CRB), is a burner that is proposed to reduce energy consumption and emission levels in comparison to currently available technology. burners are used throughout industry to produce the heat that is required during the refining process. Refineries seek to minimize the use of energy in refining while still meeting EPA regulations for emissions.

  8. The effects of moisture and particle size of feedlot biomass on co-firing burner performance 

    E-Print Network [OSTI]

    Chen, Chen-Jung

    2001-01-01

    based fuels. For coal fired power plants located around feedlots where cattle are raised, the renewable biomass is the cattle manure, called feedlot biomass (FB). Thus coal could be mixed with feedlot biomass and then fired in existing boiler burners...

  9. Front Burner- Issue 18

    Broader source: Energy.gov [DOE]

    The Cybersecurity Front Burner Issue No. 18 addresses keeping kids safe on the Internet, cyber crime, and DOE Cyber awareness and training initiatives.

  10. Front Burner- Issue 13

    Broader source: Energy.gov [DOE]

    The Cybersecurity Front Burner Issue No. 13 contained a message from the Associate Chief Information Officer (ACIO) for Cybersecurity as well as a listing of recommended cybersecurity practices.

  11. Combustor burner vanelets

    DOE Patents [OSTI]

    Lacy, Benjamin (Greer, SC); Varatharajan, Balachandar (Loveland, OH); Kraemer, Gilbert Otto (Greer, SC); Yilmaz, Ertan (Albany, NY); Zuo, Baifang (Simpsonville, SC)

    2012-02-14

    The present application provides a burner for use with a combustor of a gas turbine engine. The burner may include a center hub, a shroud, a pair of fuel vanes extending from the center hub to the shroud, and a vanelet extending from the center hub and/or the shroud and positioned between the pair of fuel vanes.

  12. Pulverized coal burner

    DOE Patents [OSTI]

    Sivy, J.L.; Rodgers, L.W.; Koslosy, J.V.; LaRue, A.D.; Kaufman, K.C.; Sarv, H.

    1998-11-03

    A burner is described having lower emissions and lower unburned fuel losses by implementing a transition zone in a low NO{sub x} burner. The improved burner includes a pulverized fuel transport nozzle surrounded by the transition zone which shields the central oxygen-lean fuel devolatilization zone from the swirling secondary combustion air. The transition zone acts as a buffer between the primary and the secondary air streams to improve the control of near-burner mixing and flame stability by providing limited recirculation regions between primary and secondary air streams. These limited recirculation regions transport evolved NO{sub x} back towards the oxygen-lean fuel pyrolysis zone for reduction to molecular nitrogen. Alternate embodiments include natural gas and fuel oil firing. 8 figs.

  13. Pulverized coal burner

    DOE Patents [OSTI]

    Sivy, Jennifer L. (Alliance, OH); Rodgers, Larry W. (Canton, OH); Koslosy, John V. (Akron, OH); LaRue, Albert D. (Uniontown, OH); Kaufman, Keith C. (Canton, OH); Sarv, Hamid (Canton, OH)

    1998-01-01

    A burner having lower emissions and lower unburned fuel losses by implementing a transition zone in a low NO.sub.x burner. The improved burner includes a pulverized fuel transport nozzle surrounded by the transition zone which shields the central oxygen-lean fuel devolatilization zone from the swirling secondary combustion air. The transition zone acts as a buffer between the primary and the secondary air streams to improve the control of near-burner mixing and flame stability by providing limited recirculation regions between primary and secondary air streams. These limited recirculation regions transport evolved NO.sub.x back towards the oxygen-lean fuel pyrolysis zone for reduction to molecular nitrogen. Alternate embodiments include natural gas and fuel oil firing.

  14. Burner control system

    SciTech Connect (OSTI)

    Cade, P.J.

    1981-01-06

    A burner control apparatus for use with a furnace installation that has an operating control to produce a request for burner operation, a flame sensor to produce a signal when flame is present in the monitored combustion chamber, and one or more devices for control of ignition and/or fuel flow. The burner control apparatus comprises lockout apparatus for de-energizing the control apparatus, a control device for actuating the ignition and/or fuel control devices, and a timing circuit that provides four successive and partially overlapping timing intervals of precise relation, including a purge timing interval, a pilot ignition interval, and a main fuel ignition interval. The present invention further includes a burner control system which verifies the proper operation of certain sensors in a burner or furnace including particularly the air flow sensor. Additionally, the present system also prevents an attempt to ignite a burner if a condition is detected which indicates that the air flow sensor has been bypassed or wedged in the actuated position.

  15. Ultralean low swirl burner

    DOE Patents [OSTI]

    Cheng, R.K.

    1998-04-07

    A novel burner and burner method has been invented which burns an ultra lean premixed fuel-air mixture with a stable flame. The inventive burning method results in efficient burning and much lower emissions of pollutants such as oxides of nitrogen than previous burners and burning methods. The inventive method imparts weak swirl (swirl numbers of between about 0.01 to 3.0) on a fuel-air flow stream. The swirl, too small to cause recirculation, causes an annulus region immediately inside the perimeter of the fuel-air flow to rotate in a plane normal to the axial flow. The rotation in turn causes the diameter of the fuel-air flow to increase with concomitant decrease in axial flow velocity. The flame stabilizes where the fuel-air mixture velocity equals the rate of burning resulting in a stable, turbulent flame. 11 figs.

  16. Ultralean low swirl burner

    DOE Patents [OSTI]

    Cheng, Robert K. (Kensington, CA)

    1998-01-01

    A novel burner and burner method has been invented which burns an ultra lean premixed fuel-air mixture with a stable flame. The inventive burning method results in efficient burning and much lower emissions of pollutants such as oxides of nitrogen than previous burners and burning methods. The inventive method imparts weak swirl (swirl numbers of between about 0.01 to 3.0) on a fuel-air flow stream. The swirl, too small to cause recirculation, causes an annulus region immediately inside the perimeter of the fuel-air flow to rotate in a plane normal to the axial flow. The rotation in turn causes the diameter of the fuel-air flow to increase with concomitant decrease in axial flow velocity. The flame stabilizes where the fuel-air mixture velocity equals the rate of burning resulting in a stable, turbulent flame.

  17. Dark matter burners

    E-Print Network [OSTI]

    Moskalenko, I V; Moskalenko, Igor V.; Wai, Lawrence L.

    2007-01-01

    We show that a star orbiting close enough to an adiabatically grown supermassive black hole (SMBH) can capture weakly interacting massive particles (WIMPs) at an extremely high rate. The stellar luminosity due to annihilation of captured WIMPs in the stellar core may be comparable to or even exceed the luminosity of the star due to thermonuclear burning. The model thus predicts the existence of unusual stars, essentially WIMP burners, in the vicinity of a SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WDs); such WDs may have a very high surface temperature. If found, such stars would provide evidence for the existence of particle dark matter and can possibly be used to establish its density profile. On the other hand, the lack of such unusual stars may provide constraints on the WIMP density near the SMBH, as well as the WIMP-nucleus scattering and pair annihilation cross-sections.

  18. Dark matter burners

    E-Print Network [OSTI]

    Igor V. Moskalenko; Lawrence L. Wai

    2007-02-24

    We show that a star orbiting close enough to an adiabatically grown supermassive black hole (SMBH) can capture weakly interacting massive particles (WIMPs) at an extremely high rate. The stellar luminosity due to annihilation of captured WIMPs in the stellar core may be comparable to or even exceed the luminosity of the star due to thermonuclear burning. The model thus predicts the existence of unusual stars, essentially WIMP burners, in the vicinity of a SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WDs); such WDs may have a very high surface temperature. If found, such stars would provide evidence for the existence of particle dark matter and can possibly be used to establish its density profile. On the other hand, the lack of such unusual stars may provide constraints on the WIMP density near the SMBH, as well as the WIMP-nucleus scattering and pair annihilation cross-sections.

  19. Rotary Burner Demonstration Fact Sheet

    SciTech Connect (OSTI)

    2003-07-01

    A new Calcpos rotary burner (CRB), eliminates electric motors, providing a simple, cost effective means of retrofitting existing fired heaters for energy and environmental reasons.

  20. Registration Form Florida's Certified Pile Burner Program

    E-Print Network [OSTI]

    Ma, Lena

    Registration Form ! Florida's Certified Pile Burner Program Tuesday, September 15, 2015 ! Polk! ! ! FFS Customer Number! ! #12;! ! Florida's Certified Pile Burner Training! Tuesday, September 15, 2015;! ! ! Florida's Certified Pile Burner Training! Frequently Asked Questions! ! Q: Why should I be a certified

  1. Cambridge Stratified Slot Burner Data

    E-Print Network [OSTI]

    Sweeney, Mark; Hochgreb, Simone; Barlow, Rob

    2010-09-23

    Stratified Slot Burner Operating Conditions: fs1,fs4,fs6 Axial Location z = 15 mm downstream of burner exit Distance from centreline (mm),Velocity (m/s),Turbulence Intensity (-) 0.5,3.7706,8.1882 1,3.7002,9.1183 1.5,3.5715,10.562 2,3.4403,11.638 2...

  2. TURBINE BURNERS: Engine Performance Improvements;

    E-Print Network [OSTI]

    Heydari, Payam

    the expansion through the turbine for turbojet , turbofan , and stationary - power gas - turbine engines. StudyTURBINE BURNERS: Engine Performance Improvements; Mixing, Ignition, and Flame-Holding in High/WEIGHT Range highly undesirable Desirable Not Good #12;TURBINE BURNER CONCEPT Turbine burning has advantage

  3. Burner balancing Salem Harbor Station

    SciTech Connect (OSTI)

    Sload, A.W.; Dube, R.J.

    1995-12-31

    The traditional method of burner balancing is first to determine the fuel distribution, then to measure the economizer outlet excess oxygen distribution and to adjust the burners accordingly. Fuel distribution is typically measured by clean and dirty air probing. Coal pipe flow can then be adjusted, if necessary, through the use of coal pipe orificing or by other means. Primary air flow must be adjusted to meet the design criteria of the burner. Once coal pipe flow is balanced to within the desired criteria, secondary air flow to individual burners can be changed by adjusting windbox dampers, burner registers, shrouds or other devices in the secondary air stream. This paper discusses problems encountered in measuring excess O{sub 2} at the economizer outlet. It is important to recognize that O{sub 2} measurements at the economizer outlet, by themselves, can be very misleading. If measurement problems are suspected or encountered, an alternate approach similar to that described should be considered. The alternate method is not only useful for burner balancing but also can be used to help in calibrating the plant excess O{sub 2} instruments and provide an on line means of cross-checking excess air measurements. Balanced burners operate closer to their design stoichiometry, providing better NO{sub x} reduction. For Salem Harbor Station, this means a significant saving in urea consumption.

  4. Radial lean direct injection burner

    DOE Patents [OSTI]

    Khan, Abdul Rafey; Kraemer, Gilbert Otto; Stevenson, Christian Xavier

    2012-09-04

    A burner for use in a gas turbine engine includes a burner tube having an inlet end and an outlet end; a plurality of air passages extending axially in the burner tube configured to convey air flows from the inlet end to the outlet end; a plurality of fuel passages extending axially along the burner tube and spaced around the plurality of air passage configured to convey fuel from the inlet end to the outlet end; and a radial air swirler provided at the outlet end configured to direct the air flows radially toward the outlet end and impart swirl to the air flows. The radial air swirler includes a plurality of vanes to direct and swirl the air flows and an end plate. The end plate includes a plurality of fuel injection holes to inject the fuel radially into the swirling air flows. A method of mixing air and fuel in a burner of a gas turbine is also provided. The burner includes a burner tube including an inlet end, an outlet end, a plurality of axial air passages, and a plurality of axial fuel passages. The method includes introducing an air flow into the air passages at the inlet end; introducing a fuel into fuel passages; swirling the air flow at the outlet end; and radially injecting the fuel into the swirling air flow.

  5. Safety Topic: Bunsen Burners and Hotplates

    E-Print Network [OSTI]

    Cohen, Robert E.

    Safety Topic: Bunsen Burners and Hotplates Justin Kleingartner Advisors: Bob Cohen Gareth McKinley #12;Bunsen Burners · Produces open flame used for heating, sterilization, and combustion · Utilizes desired flame #12;Bunsen Burners Procedures · PLACE the Bunsen burner away from any overhead shelving

  6. Catalyzed Ceramic Burner Material

    SciTech Connect (OSTI)

    Barnes, Amy S., Dr.

    2012-06-29

    Catalyzed combustion offers the advantages of increased fuel efficiency, decreased emissions (both NOx and CO), and an expanded operating range. These performance improvements are related to the ability of the catalyst to stabilize a flame at or within the burner media and to combust fuel at much lower temperatures. This technology has a diverse set of applications in industrial and commercial heating, including boilers for the paper, food and chemical industries. However, wide spread adoption of catalyzed combustion has been limited by the high cost of precious metals needed for the catalyst materials. The primary objective of this project was the development of an innovative catalyzed burner media for commercial and small industrial boiler applications that drastically reduce the unit cost of the catalyzed media without sacrificing the benefits associated with catalyzed combustion. The scope of this program was to identify both the optimum substrate material as well as the best performing catalyst construction to meet or exceed industry standards for durability, cost, energy efficiency, and emissions. It was anticipated that commercial implementation of this technology would result in significant energy savings and reduced emissions. Based on demonstrated achievements, there is a potential to reduce NOx emissions by 40,000 TPY and natural gas consumption by 8.9 TBtu in industries that heavily utilize natural gas for process heating. These industries include food manufacturing, polymer processing, and pulp and paper manufacturing. Initial evaluation of commercial solutions and upcoming EPA regulations suggests that small to midsized boilers in industrial and commercial markets could possibly see the greatest benefit from this technology. While out of scope for the current program, an extension of this technology could also be applied to catalytic oxidation for volatile organic compounds (VOCs). Considerable progress has been made over the course of the grant period in accomplishing these objectives. Our work in the area of Pd-based, methane oxidation catalysts has led to the development of highly active catalysts with relatively low loadings of Pd metal using proprietary coating methods. The thermal stability of these Pd-based catalysts were characterized using SEM and BET analyses, further demonstrating that certain catalyst supports offer enhanced stability toward both PdO decomposition and/or thermal sintering/growth of Pd particles. When applied to commercially available fiber mesh substrates (both metallic and ceramic) and tested in an open-air burner, these catalyst-support chemistries showed modest improvements in the NOx emissions and radiant output compared to uncatalyzed substrates. More significant, though, was the performance of the catalyst-support chemistries on novel media substrates. These substrates were developed to overcome the limitations that are present with commercially available substrate designs and increase the gas-catalyst contact time. When catalyzed, these substrates demonstrated a 65-75% reduction in NOx emissions across the firing range when tested in an open air burner. In testing in a residential boiler, this translated into NOx emissions of <15 ppm over the 15-150 kBtu/hr firing range.

  7. COMBUSTION OF COAL IN AN OPPOSED FLOW DIFFUSION BURNER

    E-Print Network [OSTI]

    Chin, W.K.

    2010-01-01

    an Opposed Flow Diffusion Burner Environment Division Chinmodel furnaces, flat flame burners, flow reactors, shocktubes, single particle burners, and, no doubt, others have

  8. Infected thyroglossal duct cyst.

    E-Print Network [OSTI]

    Deaver, MJ; Silman, EF; Lotfipour, S

    2009-01-01

    Som P. CT of Thyroglossal Duct Cysts. Radiology. 1985; 157:edicine Infected Thyroglossal Duct Cyst Mark J. Deaver, MD,of infected thyroglossal duct cyst was made. The patient was

  9. Burner ignition system

    DOE Patents [OSTI]

    Carignan, Forest J. (Bedford, MA)

    1986-01-21

    An electronic ignition system for a gas burner is battery operated. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. A tank circuit at the input of the transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. Once the flame is sensed, further sparks are precluded. The same flame sensor enables a thermopile driven main valve actuating circuit. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited.

  10. Criterion for burner design in thermal weed control 

    E-Print Network [OSTI]

    Gonzalez, Telca Marisa

    2001-01-01

    A covered infrared burner was designed and constructed so that it could be compared to an open-flame burner. Two covered burners, a high configuration and a low configuration, were constructed. A low configuration covered infrared burner, high...

  11. RENEWABLES RESEARCH Boiler Burner Energy System Technology

    E-Print Network [OSTI]

    RENEWABLES RESEARCH Boiler Burner Energy System Technology (BBEST) for Firetube Boilers PIER, industrial combined heat and power (CHP) boiler burner energy system technology ("BBEST"). Their research (unrecuperated) with an ultra- low nitrous oxide (NOx) boiler burner for firetube boilers. The project goals

  12. Particle deposition in ventilation ducts

    E-Print Network [OSTI]

    Sippola, Mark R.

    2002-01-01

    M. and Wang, D. (1999) Duct systems in large commercialin ventilation air supply ducts. Proceedings of Indoor Air ‘filtration efficiency of in-duct ventilation air cleaners.

  13. Duct joining system

    DOE Patents [OSTI]

    Proctor, John P. (44 Glen Dr., Fairfax, CA 94930); deKieffer, Robert C. (Boulder, CO)

    2001-01-01

    A duct joining system for providing an air-tight seal and mechanical connection for ducts and fittings is disclosed. The duct joining system includes a flexible gasket affixed to a male end of a duct or fitting. The flexible gasket is affixed at an angle relative to normal of the male end of the duct. The female end of the other duct includes a raised bead in which the flexible gasket is seated when the ducts are properly joined. The angled flexible gasket seated in the raised bead forms an air-tight seal as well as fastens or locks the male end to the female end. Alternatively, when a flexible duct is used, a band clamp with a raised bead is clamped over the female end of the flexible duct and over the male end of a fitting to provide an air tight seal and fastened connection.

  14. Duct Joining System

    DOE Patents [OSTI]

    Proctor, John P. (Fairfax, CA)

    2001-02-27

    A duct joining system for providing an air-tight seal and mechanical connection for ducts and fittings is disclosed. The duct joining system includes a flexible gasket affixed to a male end of a duct or fitting. The flexible gasket is affixed at an angle relative to normal of the male end of the duct. The female end of the other duct includes a raised bead in which the flexible gasket is seated when the ducts are properly joined. The angled flexible gasket seated in the raised bead forms an air-tight seal as well as fastens or locks the male end to the female end. Alternatively, when a flexible duct is used, a band clamp with a raised bead is clamped over the female end of the flexible duct and over the male end of a fitting to provide an air tight seal and fastened connection.

  15. Uniform-burning matrix burner

    DOE Patents [OSTI]

    Bohn, Mark S. (Golden, CO); Anselmo, Mark (Arvada, CO)

    2001-01-01

    Computer simulation was used in the development of an inward-burning, radial matrix gas burner and heat pipe heat exchanger. The burner and exchanger can be used to heat a Stirling engine on cloudy days when a solar dish, the normal source of heat, cannot be used. Geometrical requirements of the application forced the use of the inward burning approach, which presents difficulty in achieving a good flow distribution and air/fuel mixing. The present invention solved the problem by providing a plenum with just the right properties, which include good flow distribution and good air/fuel mixing with minimum residence time. CFD simulations were also used to help design the primary heat exchanger needed for this application which includes a plurality of pins emanating from the heat pipe. The system uses multiple inlet ports, an extended distance from the fuel inlet to the burner matrix, flow divider vanes, and a ring-shaped, porous grid to obtain a high-temperature uniform-heat radial burner. Ideal applications include dish/Stirling engines, steam reforming of hydrocarbons, glass working, and any process requiring high temperature heating of the outside surface of a cylindrical surface.

  16. Duct and Blower Section 

    E-Print Network [OSTI]

    Unknown

    2011-08-17

    The deflection of a spiral duct depends on its flat span, gauge, pressure, and reinforcement. Furthermore, the duct weight determines the cost of installation, not only in material costs but also labor, which is bid by the duct weight. The current...

  17. Coleman Two Burner Stove The Coleman Matchlight 2-Burner Propane Stove is especially designed for outdoor

    E-Print Network [OSTI]

    Walker, Lawrence R.

    Coleman Two Burner Stove The Coleman Matchlight 2-Burner Propane Stove is especially designed-burner propane stove has a high-pressure regulator that ensures a constant flame regardless of weather propane stove has a removable nickel-chrome-plated grate that makes for easy cleaning. The aluminized

  18. Saving Energy and Reducing Emissions with Fuel-Flexible Burners

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

    using the standard fuel injectors found in fuel oil burners. This project developed fuel-flexible burners operating on biomass-derived liquid fuels with low carbon emissions....

  19. Low-Emissions Burner Technology using Biomass-Derived Liquid...

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

    Low-Emissions Burner Technology using Biomass-Derived Liquid Fuels Low-Emissions Burner Technology using Biomass-Derived Liquid Fuels This factsheet describes a project that...

  20. SEP Success Story: Biomass Burner Cogenerates Jobs and Electricity...

    Office of Environmental Management (EM)

    Biomass Burner Cogenerates Jobs and Electricity from Lumber Mill Waste SEP Success Story: Biomass Burner Cogenerates Jobs and Electricity from Lumber Mill Waste December 6, 2011 -...

  1. Porous radiant burners having increased radiant output

    DOE Patents [OSTI]

    Tong, Timothy W. (Tempe, AZ); Sathe, Sanjeev B. (Tempe, AZ); Peck, Robert E. (Tempe, AZ)

    1990-01-01

    Means and methods for enhancing the output of radiant energy from a porous radiant burner by minimizing the scattering and increasing the adsorption, and thus emission of such energy by the use of randomly dispersed ceramic fibers of sub-micron diameter in the fabrication of ceramic fiber matrix burners and for use therein.

  2. Diesel fuel burner for diesel emissions control system

    DOE Patents [OSTI]

    Webb, Cynthia C.; Mathis, Jeffrey A.

    2006-04-25

    A burner for use in the emissions system of a lean burn internal combustion engine. The burner has a special burner head that enhances atomization of the burner fuel. Its combustion chamber is designed to be submersed in the engine exhaust line so that engine exhaust flows over the outer surface of the combustion chamber, thereby providing efficient heat transfer.

  3. Catalytic reactor with improved burner

    DOE Patents [OSTI]

    Faitani, Joseph J. (Hartford, CT); Austin, George W. (Glastonbury, CT); Chase, Terry J. (Somers, CT); Suljak, George T. (Vernon, CT); Misage, Robert J. (Manchester,all of, CT)

    1981-01-01

    To more uniformly distribute heat to the plurality of catalyst tubes in a catalytic reaction furnace, the burner disposed in the furnace above the tops of the tubes includes concentric primary and secondary annular fuel and air outlets. The fuel-air mixture from the primary outlet is directed towards the tubes adjacent the furnace wall, and the burning secondary fuel-air mixture is directed horizontally from the secondary outlet and a portion thereof is deflected downwardly by a slotted baffle toward the tubes in the center of the furnace while the remaining portion passes through the slotted baffle to another baffle disposed radially outwardly therefrom which deflects it downwardly in the vicinity of the tubes between those in the center and those near the wall of the furnace.

  4. Low Emissions Burner Technology for Metal Processing Industry using Byproducts and Biomass Derived Liquid Fuels

    SciTech Connect (OSTI)

    Agrawal, Ajay; Taylor, Robert

    2013-09-30

    This research and development efforts produced low-emission burner technology capable of operating on natural gas as well as crude glycerin and/or fatty acids generated in biodiesel plants. The research was conducted in three stages (1) Concept definition leading to the design and development of a small laboratory scale burner, (2) Scale-up to prototype burner design and development, and (3) Technology demonstration with field vefiication. The burner design relies upon the Flow Blurring (FB) fuel injection based on aerodynamically creating two-phase flow near the injector exit. The fuel tube and discharge orifice both of inside diameter D are separated by gap H. For H < 0.25D, the atomizing air bubbles into liquid fuel to create a two-phase flow near the tip of the fuel tube. Pressurized two-phase fuel-air mixture exits through the discharge orifice, which results in expansion and breakup of air bubbles yielding a spray with fine droplets. First, low-emission combustion of diesel, biodiesel and straight VO (soybean oil) was achieved by utilizing FB injector to yield fine sprays for these fuels with significantly different physical properties. Visual images for these baseline experiments conducted with heat release rate (HRR) of about 8 kW illustrate clean blue flames indicating premixed combustion for all three fuels. Radial profiles of the product gas temperature at the combustor exit overlap each other signifying that the combustion efficiency is independent of the fuel. At the combustor exit, the NOx emissions are within the measurement uncertainties, while CO emissions are slightly higher for straight VO as compared to diesel and biodiesel. Considering the large variations in physical and chemical properties of fuels considered, the small differences observed in CO and NOx emissions show promise for fuel-flexible, clean combustion systems. FB injector has proven to be very effective in atomizing fuels with very different physical properties, and it offers a path forward to utilize both fossil and alternative liquid fuels in the same combustion system. In particular, experiments show that straight VO can be cleanly combusted without the need for chemical processing or preheating steps, which can result in significant economic and environmental benefits. Next, low-emission combustion of glycerol/methane was achieved by utilizing FB injector to yield fine droplets of highly viscous glycerol. Heat released from methane combustion further improves glycerol pre-vaporization and thus its clean combustion. Methane addition results in an intensified reaction zone with locally high temperatures near the injector exit. Reduction in methane flow rate elongates the reaction zone, which leads to higher CO emissions and lower NOx emissions. Similarly, higher air to liquid (ALR) mass ratio improves atomization and fuel pre-vaporization and shifts the flame closer to the injector exit. In spite of these internal variations, all fuel mixes of glycerol with methane produced similar CO and NOx emissions at the combustor exit. Results show that FB concept provides low emissions with the flexibility to utilize gaseous and highly viscous liquid fuels, straight VO and glycerol, without preheating or preprocessing the fuels. Following these initial experiments in quartz combustor, we demonstrated that glycerol combustion can be stably sustained in a metal combustor. Phase Doppler Particle Analyzer (PDPA) measurements in glycerol/methane flames resulted in flow-weighted Sauter Mean Diameter (SMD) of 35 to 40 ?m, depending upon the methane percentage. This study verified that lab-scale dual-fuel burner using FB injector can successfully atomize and combust glycerol and presumably other highly viscous liquid fuels at relatively low HRR (<10 kW). For industrial applications, a scaled-up glycerol burner design thus seemed feasible.

  5. Reverberatory screen for a radiant burner

    DOE Patents [OSTI]

    Gray, Paul E. (North East, MD)

    1999-01-01

    The present invention relates to porous mat gas fired radiant burner panels utilizing improved reverberatory screens. The purpose of these screens is to boost the overall radiant output of the burner relative to a burner using no screen and the same fuel-air flow rates. In one embodiment, the reverberatory screen is fabricated from ceramic composite material, which can withstand higher operating temperatures than its metallic equivalent. In another embodiment the reverberatory screen is corrugated. The corrugations add stiffness which helps to resist creep and thermally induced distortions due to temperature or thermal expansion coefficient differences. As an added benefit, it has been unexpectedly discovered that the corrugations further increase the radiant efficiency of the burner. In a preferred embodiment, the reverberatory screen is both corrugated and made from ceramic composite material.

  6. The Duct Tape of Computer

    E-Print Network [OSTI]

    Sherwood, Tim

    AWK: The Duct Tape of Computer Science Research Tim Sherwood UC Santa Barbara #12;AWK - Sherwood 2 Duct Tape Systems Research Environment Ā· Lots of simulators, data, and analysis tools Ā· Since it is research, nothing works together Unix pipes are the ducts Awk is the duct tape Ā· It's not the "best" way

  7. Pollutant Exposures from Natural Gas Cooking Burners: A Simulation-Based Assessment for Southern California

    E-Print Network [OSTI]

    Logue, Jennifer M.

    2014-01-01

    in Natural Gas Cooking Burners, LBNL Page 16 Palmes, E. D. ,from Natural Gas Cooking Burners: A Simulation- Basedin Natural Gas Cooking Burners, LBNL Page 1 Disclaimer This

  8. Modeling Population Exposures to Pollutants Emitted from Natural Gas Cooking Burners

    E-Print Network [OSTI]

    Lobscheid, Agnes

    2012-01-01

    Natural Gas Cooking Burners   Agnes B.  Lobscheid 1,* , from Natural Gas Cooking Burners Agnes B. Lobscheid 1,* ,resulting from cooking burners and entry with outdoor air.

  9. Silane-propane ignitor/burner

    DOE Patents [OSTI]

    Hill, R.W.; Skinner, D.F. Jr.; Thorsness, C.B.

    1983-05-26

    A silane propane burner for an underground coal gasification process which is used to ignite the coal and to controllably retract the injection point by cutting the injection pipe. A narrow tube with a burner tip is positioned in the injection pipe through which an oxidant (oxygen or air) is flowed. A charge of silane followed by a supply of fuel, such as propane, is flowed through the tube. The silane spontaneously ignites on contact with oxygen and burns the propane fuel.

  10. Silane-propane ignitor/burner

    DOE Patents [OSTI]

    Hill, Richard W. (Livermore, CA); Skinner, Dewey F. (Livermore, CA); Thorsness, Charles B. (Livermore, CA)

    1985-01-01

    A silane propane burner for an underground coal gasification process which is used to ignite the coal and to controllably retract the injection point by cutting the injection pipe. A narrow tube with a burner tip is positioned in the injection pipe through which an oxidant (oxygen or air) is flowed. A charge of silane followed by a supply of fuel, such as propane, is flowed through the tube. The silane spontaneously ignites on contact with oxygen and burns the propane fuel.

  11. Burners and combustion apparatus for carbon nanomaterial production

    DOE Patents [OSTI]

    Alford, J. Michael (Lakewood, CO); Diener, Michael D. (Denver, CO); Nabity, James (Arvada, CO); Karpuk, Michael (Boulder, CO)

    2007-10-09

    The invention provides improved burners, combustion apparatus, and methods for carbon nanomaterial production. The burners of the invention provide sooting flames of fuel and oxidizing gases. The condensable products of combustion produced by the burners of this invention produce carbon nanomaterials including without limitation, soot, fullerenic soot, and fullerenes. The burners of the invention do not require premixing of the fuel and oxidizing gases and are suitable for use with low vapor pressure fuels such as those containing substantial amounts of polyaromatic hydrocarbons. The burners of the invention can operate with a hot (e.g., uncooled) burner surface and require little, if any, cooling or other forms of heat sinking. The burners of the invention comprise one or more refractory elements forming the outlet of the burner at which a flame can be established. The burners of the invention provide for improved flame stability, can be employed with a wider range of fuel/oxidizer (e.g., air) ratios and a wider range of gas velocities, and are generally more efficient than burners using water-cooled metal burner plates. The burners of the invention can also be operated to reduce the formation of undesirable soot deposits on the burner and on surfaces downstream of the burner.

  12. Burners and combustion apparatus for carbon nanomaterial production

    SciTech Connect (OSTI)

    Alford, J. Michael; Diener, Michael D; Nabity, James; Karpuk, Michael

    2013-02-05

    The invention provides improved burners, combustion apparatus, and methods for carbon nanomaterial production. The burners of the invention provide sooting flames of fuel and oxidizing gases. The condensable products of combustion produced by the burners of this invention produce carbon nanomaterials including without limitation, soot, fullerenic soot, and fullerenes. The burners of the invention do not require premixing of the fuel and oxidizing gases and are suitable for use with low vapor pressure fuels such as those containing substantial amounts of polyaromatic hydrocarbons. The burners of the invention can operate with a hot (e.g., uncooled) burner surface and require little, if any, cooling or other forms of heat sinking. The burners of the invention comprise one or more refractory elements forming the outlet of the burner at which a flame can be established. The burners of the invention provide for improved flame stability, can be employed with a wider range of fuel/oxidizer (e.g., air) ratios and a wider range of gas velocities, and are generally more efficient than burners using water-cooled metal burner plates. The burners of the invention can also be operated to reduce the formation of undesirable soot deposits on the burner and on surfaces downstream of the burner.

  13. Modeling particle loss in ventilation ducts

    E-Print Network [OSTI]

    Sippola, Mark R.; Nazaroff, William W.

    2003-01-01

    particles in turbulent duct flows. Chemical EngineeringDeposition in Ventilation Ducts. Ph.D. Dissertation,Deposition in Ventilating Duct Systems. Ph.D. Dissertation,

  14. Modeling particle loss in ventilation ducts

    E-Print Network [OSTI]

    Sippola, M R; Nazaroff, William W

    2003-01-01

    m) (c) 85% ASHRAE filters at air intake high-loss ducts low-loss ducts fractional fate (-) exhausted indoors indoorssurface deposition supply & return duct deposition filtered

  15. Atypical presentation of an omphalomesenteric duct cyst

    E-Print Network [OSTI]

    Ballester, Irene; Betlloch, Isabel; Pérez-Crespo, Marķa; Toledo, Fernando; Cuesta, Laura

    2009-01-01

    KW, Grosfeld JL. Vitelline duct anomalies. Experience withof the omphalomesenteric duct. Childhood differentialof an omphalomesenteric duct cyst Irene Ballester MD, Isabel

  16. CHP Integrated with Burners for Packaged Boilers

    SciTech Connect (OSTI)

    Castaldini, Carlo; Darby, Eric

    2013-09-30

    The objective of this project was to engineer, design, fabricate, and field demonstrate a Boiler Burner Energy System Technology (BBEST) that integrates a low-cost, clean burning, gas-fired simple-cycle (unrecuperated) 100 kWe (net) microturbine (SCMT) with a new ultra low-NOx gas-fired burner (ULNB) into one compact Combined Heat and Power (CHP) product that can be retrofit on new and existing industrial and commercial boilers in place of conventional burners. The Scope of Work for this project was segmented into two principal phases: (Phase I) Hardware development, assembly and pre-test and (Phase II) Field installation and demonstration testing. Phase I was divided into five technical tasks (Task 2 to 6). These tasks covered the engineering, design, fabrication, testing and optimization of each key component of the CHP system principally, ULNB, SCMT, assembly BBEST CHP package, and integrated controls. Phase I work culminated with the laboratory testing of the completed BBEST assembly prior to shipment for field installation and demonstration. Phase II consisted of two remaining technical tasks (Task 7 and 8), which focused on the installation, startup, and field verification tests at a pre-selected industrial plant to document performance and attainment of all project objectives. Technical direction and administration was under the management of CMCE, Inc. Altex Technologies Corporation lead the design, assembly and testing of the system. Field demonstration was supported by Leva Energy, the commercialization firm founded by executives at CMCE and Altex. Leva Energy has applied for patent protection on the BBEST process under the trade name of Power Burner and holds the license for the burner currently used in the product. The commercial term Power Burner is used throughout this report to refer to the BBEST technology proposed for this project. The project was co-funded by the California Energy Commission and the Southern California Gas Company (SCG), a division of Sempra Energy. These match funds were provided via concurrent contracts and investments available via CMCE, Altex, and Leva Energy The project attained all its objectives and is considered a success. CMCE secured the support of GI&E from Italy to supply 100 kW Turbec T-100 microturbines for the project. One was purchased by the project’s subcontractor, Altex, and a second spare was purchased by CMCE under this project. The microturbines were then modified to convert from their original recuperated design to a simple cycle configuration. Replacement low-NOx silo combustors were designed and bench tested in order to achieve compliance with the California Air Resources Board (CARB) 2007 emission limits for NOx and CO when in CHP operation. The converted microturbine was then mated with a low NOx burner provided by Altex via an integration section that allowed flow control and heat recovery to minimize combustion blower requirements; manage burner turndown; and recover waste heat. A new fully integrated control system was designed and developed that allowed one-touch system operation in all three available modes of operation: (1) CHP with both microturbine and burner firing for boiler heat input greater than 2 MMBtu/hr; (2) burner head only (BHO) when the microturbine is under service; and (3) microturbine only when boiler heat input requirements fall below 2 MMBtu/hr. This capability resulted in a burner turndown performance of nearly 10/1, a key advantage for this technology over conventional low NOx burners. Key components were then assembled into a cabinet with additional support systems for generator cooling and fuel supply. System checkout and performance tests were performed in the laboratory. The assembled system and its support equipment were then shipped and installed at a host facility where final performance tests were conducted following efforts to secure fabrication, air, and operating permits. The installed power burner is now in commercial operation and has achieved all the performance goals.

  17. Particle deposition in ventilation ducts

    SciTech Connect (OSTI)

    Sippola, Mark R.

    2002-09-01

    Exposure to airborne particles is detrimental to human health and indoor exposures dominate total exposures for most people. The accidental or intentional release of aerosolized chemical and biological agents within or near a building can lead to exposures of building occupants to hazardous agents and costly building remediation. Particle deposition in heating, ventilation and air-conditioning (HVAC) systems may significantly influence exposures to particles indoors, diminish HVAC performance and lead to secondary pollutant release within buildings. This dissertation advances the understanding of particle behavior in HVAC systems and the fates of indoor particles by means of experiments and modeling. Laboratory experiments were conducted to quantify particle deposition rates in horizontal ventilation ducts using real HVAC materials. Particle deposition experiments were conducted in steel and internally insulated ducts at air speeds typically found in ventilation ducts, 2-9 m/s. Behaviors of monodisperse particles with diameters in the size range 1-16 {micro}m were investigated. Deposition rates were measured in straight ducts with a fully developed turbulent flow profile, straight ducts with a developing turbulent flow profile, in duct bends and at S-connector pieces located at duct junctions. In straight ducts with fully developed turbulence, experiments showed deposition rates to be highest at duct floors, intermediate at duct walls, and lowest at duct ceilings. Deposition rates to a given surface increased with an increase in particle size or air speed. Deposition was much higher in internally insulated ducts than in uninsulated steel ducts. In most cases, deposition in straight ducts with developing turbulence, in duct bends and at S-connectors at duct junctions was higher than in straight ducts with fully developed turbulence. Measured deposition rates were generally higher than predicted by published models. A model incorporating empirical equations based on the experimental measurements was applied to evaluate particle losses in supply and return duct runs. Model results suggest that duct losses are negligible for particle sizes less than 1 {micro}m and complete for particle sizes greater than 50 {micro}m. Deposition to insulated ducts, horizontal duct floors and bends are predicted to control losses in duct systems. When combined with models for HVAC filtration and deposition to indoor surfaces to predict the ultimate fates of particles within buildings, these results suggest that ventilation ducts play only a small role in determining indoor particle concentrations, especially when HVAC filtration is present. However, the measured and modeled particle deposition rates are expected to be important for ventilation system contamination.

  18. Sealed, nozzle-mix burners for silica deposition

    DOE Patents [OSTI]

    Adler, Meryle D. M.; Brown, John T.; Misra, Mahendra K.

    2003-07-08

    Burners (40) for producing fused silica boules are provided. The burners employ a tube-in-tube (301-306) design with flats (56, 50) on some of the tubes (305, 301) being used to limit the cross-sectional area of certain passages (206, 202) within the burner and/or to atomize a silicon-containing, liquid source material, such as OMCTS. To avoid the possibility of flashback, the burner has separate passages for fuel (205) and oxygen (204, 206), i.e., the burner employs nozzle mixing, rather than premixing, of the fuel and oxygen. The burners are installed in burner holes (26) formed in the crown (20) of a furnace and form a seal with those holes so that ambient air cannot be entrained into the furnace through the holes. An external air cooled jacket (60) can be used to hold the temperature of the burner below a prescribed upper limit, e.g., 400.degree. C.

  19. Ultra-Low NOx Premixed Industrial Burner | Department of Energy

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

    Technology licensed to Maxon Corporation and sold as the M-PAKT burner. Over 1408 burners estimated to reduce NOx by over 1.550 million pounds in 2011. Applications Can be...

  20. Upgrade Boilers with Energy-Efficient Burners, Energy Tips: STEAM...

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

    The purpose of the burner is to mix molecules of fuel with molecules of air. A boiler will run only as well as the burner performs. A poorly designed boiler with an...

  1. Low NO.sub.x burner system

    DOE Patents [OSTI]

    Kitto, Jr., John B. (North Canton, OH); Kleisley, Roger J. (Plain Twp., Stark County, OH); LaRue, Albert D. (Summit, OH); Latham, Chris E. (Knox Twp., Columbiana County, OH); Laursen, Thomas A. (Canton, OH)

    1993-01-01

    A low NO.sub.x burner system for a furnace having spaced apart front and rear walls, comprises a double row of cell burners on each of the front and rear walls. Each cell burner is either of the inverted type with a secondary air nozzle spaced vertically below a coal nozzle, or the non-inverted type where the coal nozzle is below the secondary air port. The inverted and non-inverted cells alternate or are provided in other specified patterns at least in the lower row of cells. A small percentage of the total air can be also provided through the hopper or hopper throat forming the bottom of the furnace, or through the boiler hopper side walls. A shallow angle impeller design also advances the purpose of the invention which is to reduce CO and H.sub.2 S admissions while maintaining low NO.sub.x generation.

  2. Duct Leakage Repeatability Testing

    SciTech Connect (OSTI)

    Walker, Iain; Sherman, Max

    2014-08-01

    The purpose of this report is to evaluate the repeatability of the three most significant measurement techniques for duct leakage using data from the literature and recently obtained field data. We will also briefly discuss the first two factors. The main question to be answered by this study is to determine if differences in the repeatability of these tests methods is sufficient to indicate that any of these methods is so poor that it should be excluded from consideration as an allowed procedure in codes and standards. The three duct leak measurement methods assessed in this report are the two duct pressurization methods that are commonly used by many practitioners and the DeltaQ technique. These are methods B, C and A, respectively of the ASTM E1554 standard. Although it would be useful to evaluate other duct leak test methods, this study focused on those test methods that are commonly used and are required in various test standards, such as BPI (2010), RESNET (2014), ASHRAE 62.2 (2013), California Title 24 (CEC 2012), DOE Weatherization and many other energy efficiency programs.

  3. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul criteria, will be stated at the beginning of lecture #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2 · Muscle Physiology · Heart and circulatory functions · Neuroethology #12;FB2 Biologie / Chemie www

  4. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014%) written exam (60%) journal (20%) Preparation of course work (20%) #12;FB2 Biologie / Chemie www · Antioxidants #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  5. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Klausur (50%) Protokolle Grundkurs (50%) written exam (50%) journal (50%) #12;FB2 Biologie / Chemie www

  6. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Modulprüfung (MP) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie

  7. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie www

  8. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014-up to the tutorial protocol corrections communication with lecturers and students #12;FB2 Biologie / Chemie www

  9. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 protocols. #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 of the lecture #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  10. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 of lecture #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 functions · Learning, memory, sleep #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO

  11. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Lerntagebuches Journal #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd the different taxa #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd

  12. Fuel burner and combustor assembly for a gas turbine engine

    DOE Patents [OSTI]

    Leto, Anthony (Franklin Lakes, NJ)

    1983-01-01

    A fuel burner and combustor assembly for a gas turbine engine has a housing within the casing of the gas turbine engine which housing defines a combustion chamber and at least one fuel burner secured to one end of the housing and extending into the combustion chamber. The other end of the fuel burner is arranged to slidably engage a fuel inlet connector extending radially inwardly from the engine casing so that fuel is supplied, from a source thereof, to the fuel burner. The fuel inlet connector and fuel burner coact to anchor the housing against axial movement relative to the engine casing while allowing relative radial movement between the engine casing and the fuel burner and, at the same time, providing fuel flow to the fuel burner. For dual fuel capability, a fuel injector is provided in said fuel burner with a flexible fuel supply pipe so that the fuel injector and fuel burner form a unitary structure which moves with the fuel burner.

  13. Refinery burner simulation design architecture summary.

    SciTech Connect (OSTI)

    Pollock, Guylaine M.; McDonald, Michael James; Halbgewachs, Ronald D.

    2011-10-01

    This report describes the architectural design for a high fidelity simulation of a refinery and refinery burner, including demonstrations of impacts to the refinery if errors occur during the refinery process. The refinery burner model and simulation are a part of the capabilities within the Sandia National Laboratories Virtual Control System Environment (VCSE). Three components comprise the simulation: HMIs developed with commercial SCADA software, a PLC controller, and visualization software. All of these components run on different machines. This design, documented after the simulation development, incorporates aspects not traditionally seen in an architectural design, but that were utilized in this particular demonstration development. Key to the success of this model development and presented in this report are the concepts of the multiple aspects of model design and development that must be considered to capture the necessary model representation fidelity of the physical systems.

  14. LBNL -45423 Stopping Duct Quacks: Longevity of

    E-Print Network [OSTI]

    LBNL - 45423 Stopping Duct Quacks: Longevity of Residential Duct Sealants Max H. Sherman, Iain S Duct leakage has been identified as a major source of energy loss in residential buildings. Most duct leakage occurs at the connections to registers, plenums or branches in the duct system. At each

  15. PULSE DRYING EXPERIMENT AND BURNER CONSTRUCTION

    SciTech Connect (OSTI)

    Robert States

    2006-07-15

    Non steady impingement heat transfer is measured. Impingement heating consumes 130 T-BTU/Yr in paper drying, but is only 25% thermally efficient. Pulse impingement is experimentally shown to enhance heat transfer by 2.8, and may deliver thermal efficiencies near 85%. Experimental results uncovered heat transfer deviations from steady theory and from previous investigators, indicating the need for further study and a better theoretical framework. The pulse burner is described, and its roll in pulse impingement is analyzed.

  16. Coal-water mixture fuel burner

    DOE Patents [OSTI]

    Brown, T.D.; Reehl, D.P.; Walbert, G.F.

    1985-04-29

    The present invention represents an improvement over the prior art by providing a rotating cup burner arrangement for use with a coal-water mixture fuel which applies a thin, uniform sheet of fuel onto the inner surface of the rotating cup, inhibits the collection of unburned fuel on the inner surface of the cup, reduces the slurry to a collection of fine particles upon discharge from the rotating cup, and further atomizes the fuel as it enters the combustion chamber by subjecting it to the high shear force of a high velocity air flow. Accordingly, it is an object of the present invention to provide for improved combustion of a coal-water mixture fuel. It is another object of the present invention to provide an arrangement for introducing a coal-water mixture fuel into a combustion chamber in a manner which provides improved flame control and stability, more efficient combustion of the hydrocarbon fuel, and continuous, reliable burner operation. Yet another object of the present invention is to provide for the continuous, sustained combustion of a coal-water mixture fuel without the need for a secondary combustion source such as natural gas or a liquid hydrocarbon fuel. Still another object of the present invention is to provide a burner arrangement capable of accommodating a coal-water mixture fuel having a wide range of rheological and combustion characteristics in providing for its efficient combustion. 7 figs.

  17. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 presentation #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  18. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2 Rechenmethoden in den Naturwissenschaften für Studierende der Chemie und Biologie B Calculus for the Natural

  19. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014%) presentation (30%) oral exam (70%) #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO

  20. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul

  1. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Mentorenprogramm statt. The oral exam is part of the mentoring. #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2

  2. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 (20%) report (80%) Presentation (20%) #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni

  3. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Modulprüfung (MP) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie of brains are included. Diseases and etiologies are also presented. #12;FB2 Biologie / Chemie www

  4. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 written exam #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd

  5. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014%) presentation (20%) #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd

  6. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014%) Protokolle (70%) presentation (30%) journal (70%) #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni

  7. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Biology" . #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  8. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 percent) and computational tasks (80 percent). #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni

  9. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part exam exclusively based on lecture #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO

  10. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Chemie 1, Bio 2 Studienvarianten /The module / submodule is part of the following study types Vollfach) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO

  11. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Biochemistry". #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  12. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 and to evalute the own level of knowledge through feedbacks. #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2

  13. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014: Erfolgreicher Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part work (not graded) #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011

  14. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014: Erfolgreicher Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni

  15. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Modulprüfung (MP) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie, interference) #12;FB2 Biologie / Chemie www.

  16. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014, Kleingruppenpräsentation presentation script and presentation #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni

  17. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 (30%) report (70%) presentation (30%) #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni

  18. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014: Marine invertrebrates alternating with Marine Algae. #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2

  19. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014: Erfolgreicher Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part knowledge of genetics is relevant. #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO

  20. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO

  1. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 hours #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  2. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 geregelt (§ 7). #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd

  3. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Modulprüfung (MP) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie Kernphysik - Aufbau der Materie (Kernteilchen) - Radioaktivität content #12;FB2 Biologie / Chemie www

  4. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul written exam #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd

  5. MHD duct flows under hydrodynamic “slip” condition

    E-Print Network [OSTI]

    Smolentsev, S.

    2009-01-01

    two-dimensional turbulence in MHD duct ?ows, CTR, Stanfordow in rectangular ducts. J. Fluid Mech. 21, 577–590 (1965)C L E S. Smolentsev MHD duct ?ows under hydrodynamic “slip”

  6. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module their function. #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  7. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module code Bio 6 of vertebrates #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014

  8. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 of the exam is 50% of each submodule #12;FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module

  9. Enhanced Combustion Low NOx Pulverized Coal Burner

    SciTech Connect (OSTI)

    Ray Chamberland; Aku Raino; David Towle

    2006-09-30

    For more than two decades, ALSTOM Power Inc. (ALSTOM) has developed a range of low cost, in-furnace technologies for NOx emissions control for the domestic U.S. pulverized coal fired boiler market. This includes ALSTOM's internally developed TFS 2000 firing system, and various enhancements to it developed in concert with the U.S. Department of Energy (DOE). As of 2004, more than 200 units representing approximately 75,000 MWe of domestic coal fired capacity have been retrofit with ALSTOM low NOx technology. Best of class emissions range from 0.18 lb/MMBtu for bituminous coals to 0.10 lb/MMBtu for subbituminous coals, with typical levels at 0.24 lb/MMBtu and 0.13 lb/MMBtu, respectively. Despite these gains, NOx emissions limits in the U.S. continue to ratchet down for new and existing (retrofit) boiler equipment. If enacted, proposed Clear Skies legislation will, by 2008, require an average, effective, domestic NOx emissions rate of 0.16 lb/MMBtu, which number will be reduced to 0.13 lb/MMBtu by 2018. Such levels represent a 60% and 67% reduction, respectively, from the effective 2000 level of 0.40 lb/MMBtu. Low cost solutions to meet such regulations, and in particular those that can avoid the need for a costly selective catalytic reduction system (SCR), provide a strong incentive to continue to improve low NOx firing system technology to meet current and anticipated NOx control regulations. In light of these needs, ALSTOM, in cooperation with the DOE, is developing an enhanced combustion, low NOx pulverized coal burner which, when integrated with ALSTOM's state-of-the-art, globally air staged low NOx firing systems, will provide a means to achieve less than 0.15 lb/MMBtu NOx at less than 3/4 the cost of an SCR with low to no impact on balance of plant issues when firing a high volatile bituminous coal. Such coals can be more economic to fire than subbituminous or Powder River Basin (PRB) coals, but are more problematic from a NOx control standpoint as existing firing system technologies do not provide a means to meet current or anticipated regulations absent the use of an SCR. The DOE/ALSTOM program performed large pilot scale combustion testing in ALSTOM's Industrial Scale Burner Facility (ISBF) at its U.S. Power Plant Laboratories facility in Windsor, Connecticut. During this work, the near-field combustion environment was optimized to maximize NOx reduction while minimizing the impact on unburned carbon in ash, slagging and fouling, corrosion, and flame stability/turn-down under globally reducing conditions. Initially, ALSTOM utilized computational fluid dynamic modeling to evaluate a series of burner and/or near field stoichiometry controls in order to screen promising design concepts in advance of the large pilot scale testing. The third and final test, to be executed, will utilize several variants of the best nozzle tip configuration and compare performance with 3 different coals. The fuels to be tested will cover a wide range of coals commonly fired at US utilities. The completion of this work will provide sufficient data to allow ALSTOM to design, construct, and demonstrate a commercial version of an enhanced combustion low NOx pulverized coal burner. A preliminary cost/performance analysis of the developed enhanced combustion low NOx burner applied to ALSTOM's state-of-the-art TFS 2000 firing system was performed to show that the burner enhancements is a cost effective means to reduce NOx.

  10. Modeling Population Exposures to Pollutants Emitted from Natural Gas Cooking Burners

    E-Print Network [OSTI]

    Lobscheid, Agnes

    2012-01-01

    BC et al. (2009). Natural Gas Variability in California:to Pollutants  Emitted from Natural Gas Cooking Burners  Pollutants Emitted from Natural Gas Cooking Burners Agnes B.

  11. Turbine Burners: Flameholding in Accelerating Flow W. A. Sirignano1

    E-Print Network [OSTI]

    Liu, Feng

    1 Turbine Burners: Flameholding in Accelerating Flow W. A. Sirignano1 , D. Dunn-Rankin2 , F. Liu3 B, Irvine Abstract A review of turbine-burner research and some relevant background issues is presented. Previous work on thermal cycle analysis for augmentative combustion in the passages of the turbine

  12. Combined Heat and Power Integrated with Burners for Packaged Boilers

    SciTech Connect (OSTI)

    2010-10-01

    This factsheet describes a project that will seamlessly integrate a gas-fired simple-cycle 100 kWe microturbine with a new ultra-low NOx gas-fired burner to develop a CHP assembly called the Boiler Burner Energy System Technology.

  13. Residential oil burners with low input and two stages firing

    SciTech Connect (OSTI)

    Butcher, T.; Krajewski, R.; Leigh, R.

    1997-12-31

    The residential oil burner market is currently dominated by the pressure-atomized, retention head burner. At low firing rates pressure atomizing nozzles suffer rapid fouling of the small internal passages, leading to bad spray patterns and poor combustion performance. To overcome the low input limitations of conventional burners, a low pressure air-atomized burner has been developed watch can operate at fining rates as low as 0.25 gallons of oil per hour (10 kW). In addition, the burner can be operated in a high/low fining rate mode. Field tests with this burner have been conducted at a fixed input rate of 0.35 gph (14 kW) with a side-wall vented boiler/water storage tank combination. At the test home, instrumentation was installed to measure fuel and energy flows and record trends in system temperatures. Laboratory efficiency testing with water heaters and boilers has been completed using standard single purpose and combined appliance test procedures. The tests quantify benefits due to low firing rates and other burner features. A two stage oil burner gains a strong advantage in rated efficiency while maintaining capacity for high domestic hot water and space heating loads.

  14. Duct spinning mode's particle velocity imaging with in-duct circular microphone array

    E-Print Network [OSTI]

    Huang, Xun

    Duct spinning mode's particle velocity imaging with in-duct circular microphone array Qingkai Wei's Republic of China Nowadays, the measurements within a duct have to be conducted using in-duct microphone. In this work, an imaging method of acoustic spinning modes propagating within a circular duct simply

  15. Articulated transition duct in turbomachine

    DOE Patents [OSTI]

    Flanagan, James Scott; McMahan, Kevin Weston; LeBegue, Jeffrey Scott; Pentecost, Ronnie Ray

    2014-04-29

    Turbine systems are provided. A turbine system includes a transition duct comprising an inlet, an outlet, and a duct passage extending between the inlet and the outlet and defining a longitudinal axis, a radial axis, and a tangential axis. The outlet of the transition duct is offset from the inlet along the longitudinal axis and the tangential axis. The duct passage includes an upstream portion and a downstream portion. The upstream portion extends from the inlet between an inlet end and an aft end. The downstream portion extends from the outlet between an outlet end and a head end. The turbine system further includes a joint coupling the aft end of the upstream portion and the head end of the downstream portion together. The joint is configured to allow movement of the upstream portion and the downstream portion relative to each other about or along at least one axis.

  16. Flow duct for nuclear reactors

    DOE Patents [OSTI]

    Straalsund, Jerry L. (Richland, WA)

    1978-01-01

    Improved liquid sodium flow ducts for nuclear reactors are described wherein the improvement comprises varying the wall thickness of each of the walls of a polygonal tubular duct structure so that each of the walls is of reduced cross-section along the longitudinal center line and of a greater cross-section along wall junctions with the other walls to form the polygonal tubular configuration.

  17. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Art der Prüfung / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module code Bio 4

  18. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module

  19. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014: Erfolgreicher Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Art der Prüfung

  20. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie www

  1. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Art der Prüfung

  2. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 20142 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul

  3. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014: Erfolgreicher Abschluss der Module Chemie 1, Bio 2. MBW 1. Studienvarianten /The module / submodule is part Modulprüfung (MP) / Assessment of module (MP) or submodule (TP) Klausur written exam #12;FB2 Biologie / Chemie

  4. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module code FD 1 6

  5. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014, Chemisches Grundpraktikum/ P Allgemeine Chemie für den Teil Biochemie-Praktikum Unterrichtssprache / language) or submodule (TP) entspricht Studienleistung (unbenotet) course work (not graded) #12;FB2 Biologie / Chemie www

  6. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module code Gentec

  7. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 learning outcome Domain I

  8. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modul / module code PM 1

  9. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014 insbesondere der Biologie und in Teilen der naturwissenschaftlicher Fächer Physik und Chemie an Beispielen- und situationsgerechten Einsatz nennen und erläutern (2.1 + 2.2) #12;FB2 Biologie / Chemie www

  10. Compression effects on pressure loss in flexible HVAC ducts

    E-Print Network [OSTI]

    Abushakra, Bass; Walker, Iain S.; Sherman, Max H.

    2002-01-01

    Flow Resistance of HVAC Air Ducts and Fittings. American= pitch of the flexible duct (longitudinal distance between49700. ACCA. 1995. Residential Duct Systems. Manual D. Air

  11. Integrating ducts into the conditioned space: Successes and challenges

    E-Print Network [OSTI]

    Siegel, Jeffrey; Walker, Iain

    2004-01-01

    Improvements from Duct Retrofits on Six Electrically-Heatedal. (2001) Development of a New Duct Leakage Test: Delta Q.Field investigation of duct system performance in California

  12. Buried and Encapsulated Ducts - Building America Top Innovation...

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

    Buried and Encapsulated Ducts - Building America Top Innovation Buried and Encapsulated Ducts - Building America Top Innovation photo of worker blowing insulation on ducts in an...

  13. Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Particles

    E-Print Network [OSTI]

    2001-01-01

    Building Cavities Used As Ducts: Air Leakage Characteristicspan” technique to prioritize duct sealing efforts: a studyField investigation of duct system performance in California

  14. Burner Designs and Controls for Variable Air Preheat Systems 

    E-Print Network [OSTI]

    Lied, C. R.

    1981-01-01

    This paper will deal with various ways of reducing fuel costs for direct fired furnaces. Burner design relating to existing furnaces, new furnaces designed to operate initially on cold air with the ability to add preheated air in the future...

  15. Advanced Petrochemical Process Heating with the Pyrocore Burner 

    E-Print Network [OSTI]

    Krill, W. V.; Minden, A. C.; Donaldson, L. W. Jr.

    1987-01-01

    PETROCHEMICAL PROCESS HEATING WITH THE PYROCORE BURNER WAYNE V. KRILL ANDREW C. MINDEN LESLIE W. DONALDSON, JR. Vice President Project Engineer Manager, Process Systems Research Alzeta Corporation Alzeta Corporation Gas Research Institute Santa Clara..., California Santa Clara, California Chicago, Illinois ABSTRACT Alzeta Corporation has developed various process heating applications using the Pyrocore burner. Applications to immersion fluid heating have been in use for several years. An advanced...

  16. Advanced burner test reactor preconceptual design report.

    SciTech Connect (OSTI)

    Chang, Y. I.; Finck, P. J.; Grandy, C.; Cahalan, J.; Deitrich, L.; Dunn, F.; Fallin, D.; Farmer, M.; Fanning, T.; Kim, T.; Krajtl, L.; Lomperski, S.; Moisseytsev, A.; Momozaki, Y.; Sienicki, J.; Park, Y.; Tang, Y.; Reed, C.; Tzanos, C; Wiedmeyer, S.; Yang, W.; Chikazawa, Y.; JAEA

    2008-12-16

    The goals of the Global Nuclear Energy Partnership (GNEP) are to expand the use of nuclear energy to meet increasing global energy demand, to address nuclear waste management concerns and to promote non-proliferation. Implementation of the GNEP requires development and demonstration of three major technologies: (1) Light water reactor (LWR) spent fuel separations technologies that will recover transuranics to be recycled for fuel but not separate plutonium from other transuranics, thereby providing proliferation-resistance; (2) Advanced Burner Reactors (ABRs) based on a fast spectrum that transmute the recycled transuranics to produce energy while also reducing the long term radiotoxicity and decay heat loading in the repository; and (3) Fast reactor fuel recycling technologies to recover and refabricate the transuranics for repeated recycling in the fast reactor system. The primary mission of the ABR Program is to demonstrate the transmutation of transuranics recovered from the LWR spent fuel, and hence the benefits of the fuel cycle closure to nuclear waste management. The transmutation, or burning of the transuranics is accomplished by fissioning and this is most effectively done in a fast spectrum. In the thermal spectrum of commercial LWRs, some transuranics capture neutrons and become even heavier transuranics rather than being fissioned. Even with repeated recycling, only about 30% can be transmuted, which is an intrinsic limitation of all thermal spectrum reactors. Only in a fast spectrum can all transuranics be effectively fissioned to eliminate their long-term radiotoxicity and decay heat. The Advanced Burner Test Reactor (ABTR) is the first step in demonstrating the transmutation technologies. It directly supports development of a prototype full-scale Advanced Burner Reactor, which would be followed by commercial deployment of ABRs. The primary objectives of the ABTR are: (1) To demonstrate reactor-based transmutation of transuranics as part of an advanced fuel cycle; (2) To qualify the transuranics-containing fuels and advanced structural materials needed for a full-scale ABR; and (3) To support the research, development and demonstration required for certification of an ABR standard design by the U.S. Nuclear Regulatory Commission. The ABTR should also address the following additional objectives: (1) To incorporate and demonstrate innovative design concepts and features that may lead to significant improvements in cost, safety, efficiency, reliability, or other favorable characteristics that could promote public acceptance and future private sector investment in ABRs; (2) To demonstrate improved technologies for safeguards and security; and (3) To support development of the U.S. infrastructure for design, fabrication and construction, testing and deployment of systems, structures and components for the ABRs. Based on these objectives, a pre-conceptual design of a 250 MWt ABTR has been developed; it is documented in this report. In addition to meeting the primary and additional objectives listed above, the lessons learned from fast reactor programs in the U.S. and worldwide and the operating experience of more than a dozen fast reactors around the world, in particular the Experimental Breeder Reactor-II have been incorporated into the design of the ABTR to the extent possible.

  17. Evaporation Duct Estimation from Clutter Using Meteorological Statistics

    E-Print Network [OSTI]

    Gerstoft, Peter

    Evaporation Duct Estimation from Clutter Using Meteorological Statistics Caglar Yardim*, Peter under duct- ing conditions. Electromagnetic ducts result in non-standard electromagnetic prop- agation addresses how to incorporate meteo- rological statistics into evaporative duct estimation within a Bayesian

  18. Tracking Atmospheric Ducts Using Radar Clutter: I. Evaporation Duct Tracking Using Kalman Filters

    E-Print Network [OSTI]

    Gerstoft, Peter

    Tracking Atmospheric Ducts Using Radar Clutter: I. Evaporation Duct Tracking Using Kalman Filters 92093­0238, USA Introduction This paper addresses the problem of tracking evaporation ducts in marine-standard electromagnetic propagation due to formation of lower atmospheric sea ducts is a common occurrence in maritime

  19. Tracking Atmospheric Ducts Using Radar Clutter: II. Surface-based Duct Tracking Using Multiple Model

    E-Print Network [OSTI]

    Gerstoft, Peter

    Tracking Atmospheric Ducts Using Radar Clutter: II. Surface-based Duct Tracking Using Multiple variability in tracking surface-based ducts in marine and coastal environments. The method tracks of the problem and evaporation duct tracking has been introduced in [1]. In previous studies, atmospheric

  20. Double Ducted Fan (DDF) as a Novel Ducted Fan Inlet Lip Separation Control Device

    E-Print Network [OSTI]

    Camci, Cengiz

    Double Ducted Fan (DDF) as a Novel Ducted Fan Inlet Lip Separation Control Device Ali Akturk computational study of a novel ducted fan inlet flow conditioning concept that will significantly improve the performance and controllability of VTOL UAVs and many other ducted fan based systems. The new concept

  1. Measurements of Smoke Characteristics in HVAC Ducts 

    E-Print Network [OSTI]

    Wolin, Steven D; Ryder, Noah L; Leprince, Frederic; Milke, James; Mowrer, Frederick; Torero, Jose L

    2001-01-01

    The characteristics of smoke traveling in an HVAC duct have been observed along with the response of selected duct smoke detectors. The simulated HVAC system consists of a 9 m long duct, 0.45 m in diameter. An exhaust fan is placed at one end...

  2. Enhanced Combustion Low NOx Pulverized Coal Burner

    SciTech Connect (OSTI)

    David Towle; Richard Donais; Todd Hellewell; Robert Lewis; Robert Schrecengost

    2007-06-30

    For more than two decades, Alstom Power Inc. (Alstom) has developed a range of low cost, infurnace technologies for NOx emissions control for the domestic U.S. pulverized coal fired boiler market. This includes Alstom's internally developed TFS 2000{trademark} firing system, and various enhancements to it developed in concert with the U.S. Department of Energy. As of the date of this report, more than 270 units representing approximately 80,000 MWe of domestic coal fired capacity have been retrofit with Alstom low NOx technology. Best of class emissions range from 0.18 lb/MMBtu for bituminous coal to 0.10 lb/MMBtu for subbituminous coal, with typical levels at 0.24 lb/MMBtu and 0.13 lb/MMBtu, respectively. Despite these gains, NOx emissions limits in the U.S. continue to ratchet down for new and existing boiler equipment. On March 10, 2005, the Environmental Protection Agency (EPA) announced the Clean Air Interstate Rule (CAIR). CAIR requires 25 Eastern states to reduce NOx emissions from the power generation sector by 1.7 million tons in 2009 and 2.0 million tons by 2015. Low cost solutions to meet such regulations, and in particular those that can avoid the need for a costly selective catalytic reduction system (SCR), provide a strong incentive to continue to improve low NOx firing system technology to meet current and anticipated NOx control regulations. The overall objective of the work is to develop an enhanced combustion, low NOx pulverized coal burner, which, when integrated with Alstom's state-of-the-art, globally air staged low NOx firing systems will provide a means to achieve: Less than 0.15 lb/MMBtu NOx emissions when firing a high volatile Eastern or Western bituminous coal, Less than 0.10 lb/MMBtu NOx emissions when firing a subbituminous coal, NOx reduction costs at least 25% lower than the costs of an SCR, Validation of the NOx control technology developed through large (15 MWt) pilot scale demonstration, and Documentation required for economic evaluation and commercial application. During the project performance period, Alstom performed computational fluid dynamics (CFD) modeling and large pilot scale combustion testing in its Industrial Scale Burner Facility (ISBF) at its U.S. Power Plant Laboratories facility in Windsor, Connecticut in support of these objectives. The NOx reduction approach was to optimize near-field combustion to ensure that minimum NOx emissions are achieved with minimal impact on unburned carbon in ash, slagging and fouling, corrosion, and flame stability/turn-down. Several iterations of CFD and combustion testing on a Midwest coal led to an optimized design, which was extensively combustion tested on a range of coals. The data from these tests were then used to validate system costs and benefits versus SCR. Three coals were evaluated during the bench-scale and large pilot-scale testing tasks. The three coals ranged from a very reactive subbituminous coal to a moderately reactive Western bituminous coal to a much less reactive Midwest bituminous coal. Bench-scale testing was comprised of standard ASTM properties evaluation, plus more detailed characterization of fuel properties through drop tube furnace testing and thermogravimetric analysis. Bench-scale characterization of the three test coals showed that both NOx emissions and combustion performance are a strong function of coal properties. The more reactive coals evolved more of their fuel bound nitrogen in the substoichiometric main burner zone than less reactive coal, resulting in the potential for lower NOx emissions. From a combustion point of view, the more reactive coals also showed lower carbon in ash and CO values than the less reactive coal at any given main burner zone stoichiometry. According to bench-scale results, the subbituminous coal was found to be the most amenable to both low NOx, and acceptably low combustibles in the flue gas, in an air staged low NOx system. The Midwest bituminous coal, by contrast, was predicted to be the most challenging of the three coals, with the Western bituminous coal predicted to beh

  3. Dual-water mixture fuel burner

    DOE Patents [OSTI]

    Brown, Thomas D. (Finleyville, PA); Reehl, Douglas P. (Pittsburgh, PA); Walbert, Gary F. (Library, PA)

    1986-08-05

    A coal-water mixture (CWM) burner includes a conically shaped rotating cup into which fuel comprised of coal particles suspended in a slurry is introduced via a first, elongated inner tube coupled to a narrow first end portion of the cup. A second, elongated outer tube is coaxially positioned about the first tube and delivers steam to the narrow first end of the cup. The fuel delivery end of the inner first tube is provided with a helical slot on its lateral surface for directing the CWM onto the inner surface of the rotating cup in the form of a uniform, thin sheet which, under the influence of the cup's centrifugal force, flows toward a second, open, expanded end portion of the rotating cup positioned immediately adjacent to a combustion chamber. The steam delivered to the rotating cup wets its inner surface and inhibits the coal within the CWM from adhering to the rotating cup. A primary air source directs a high velocity air flow coaxially about the expanded discharge end of the rotating cup for applying a shear force to the CWM in atomizing the fuel mixture for improved combustion. A secondary air source directs secondary air into the combustion chamber adjacent to the outlet of the rotating cup at a desired pitch angle relative to the fuel mixture/steam flow to promote recirculation of hot combustion gases within the ignition zone for increased flame stability.

  4. Flame quality monitor system for fixed firing rate oil burners

    DOE Patents [OSTI]

    Butcher, Thomas A. (Pt. Jefferson, NY); Cerniglia, Philip (Moriches, NY)

    1992-01-01

    A method and apparatus for determining and indicating the flame quality, or efficiency of the air-fuel ratio, in a fixed firing rate heating unit, such as an oil burning furnace, is provided. When the flame brightness falls outside a preset range, the flame quality, or excess air, has changed to the point that the unit should be serviced. The flame quality indicator output is in the form of lights mounted on the front of the unit. A green light indicates that the flame is about in the same condition as when the burner was last serviced. A red light indicates a flame which is either too rich or too lean, and that servicing of the burner is required. At the end of each firing cycle, the flame quality indicator goes into a hold mode which is in effect during the period that the burner remains off. A yellow or amber light indicates that the burner is in the hold mode. In this mode, the flame quality lights indicate the flame condition immediately before the burner turned off. Thus the unit can be viewed when it is off, and the flame condition at the end of the previous firing cycle can be observed.

  5. OPTIMIZATION OF COAL PARTICLE FLOW PATTERNS IN LOW NOX BURNERS

    SciTech Connect (OSTI)

    Jost O.L. Wendt; Gregory E. Ogden; Jennifer Sinclair; Stephanus Budilarto

    2001-09-04

    It is well understood that the stability of axial diffusion flames is dependent on the mixing behavior of the fuel and combustion air streams. Combustion aerodynamic texts typically describe flame stability and transitions from laminar diffusion flames to fully developed turbulent flames as a function of increasing jet velocity. Turbulent diffusion flame stability is greatly influenced by recirculation eddies that transport hot combustion gases back to the burner nozzle. This recirculation enhances mixing and heats the incoming gas streams. Models describing these recirculation eddies utilize conservation of momentum and mass assumptions. Increasing the mass flow rate of either fuel or combustion air increases both the jet velocity and momentum for a fixed burner configuration. Thus, differentiating between gas velocity and momentum is important when evaluating flame stability under various operating conditions. The research efforts described herein are part of an ongoing project directed at evaluating the effect of flame aerodynamics on NO{sub x} emissions from coal fired burners in a systematic manner. This research includes both experimental and modeling efforts being performed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NO{sub x} burners. Experimental studies include both cold-and hot-flow evaluations of the following parameters: primary and secondary inlet air velocity, coal concentration in the primary air, coal particle size distribution and flame holder geometry. Hot-flow experiments will also evaluate the effect of wall temperature on burner performance.

  6. $A^t_{FB}$ Meets LHC

    SciTech Connect (OSTI)

    Hewett, JoAnne L.; /SLAC; Shelton, Jessie; /Yale U.; Spannowsky, Michael; /Oregon U.; Tait, Tim M.P.; /UC, Irvine; Takeuchi, Michihisa; /Heidelberg U.

    2012-02-14

    The recent Tevatron measurement of the forward-backward asymmetry of the top quark shows an intriguing discrepancy with Standard Model expectations, particularly at large t{bar t} invariant masses. Measurements of this quantity are subtle at the LHC, due to its pp initial state, however, one can define a forward-central-charge asymmetry which captures the physics. We study the capability of the LHC to measure this asymmetry and find that within the SM a measurement at the 5{sigma} level is possible with roughly 60 fb{sup -1} at {radical}s = 14 TeV. If nature realizes a model which enhances the asymmetry (as is necessary to explain the Tevatron measurements), a significant difference from zero can be observed much earlier, perhaps even during early LHC running at {radical}s = 7 TeV. We further explore the capabilities of the 7 TeV LHC to discover resonances or contact interactions which modify the t{bar t} invariant mass distribution using recent boosted top tagging techniques. We find that TeV-scale color octet resonances can be discovered, even with small coupling strengths and that contact interactions can be probed at scales exceeding 6 TeV. Overall, the LHC has good potential to clarify the situation with regards to the Tevatron forward-backward measurement.

  7. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modulbeschreibung / Module Description Modul / module code Che 2 6 ECTS-Punkte / credit points Chemie-Praktika Lab, Chemisches Grundpraktikum/ P Allgemeine Chemie für den Teil Biochemie-Praktikum Unterrichtssprache / language

  8. FB2 Biologie / Chemie www.uni-bremen.de

    E-Print Network [OSTI]

    Diekmann, Martin

    FB2 Biologie / Chemie www.uni-bremen.de www.fb2.uni-bremen.de BPO Biologie 2011 / MEd 2014/15 Modulbeschreibung / Module Description Modul / module code Che 1 9 ECTS-Punkte / credit points Allgemeine Chemie Moduls ist, allen Studierenden der Biologie und Geologie Einblick in wesentliche Grundlagen der Chemie

  9. Numerical Modelling of a Pulse Combustion Burner: Limiting Conditions of Stable

    E-Print Network [OSTI]

    Vuik, Kees

    Numerical Modelling of a Pulse Combustion Burner: Limiting Conditions of Stable Operation P.A. van in the burner system. Self-sustained pulse combustion and high-intensity sound waves result if the system

  10. Turbine-Burner Model: Cavity Flameholding in a Converging, Turning Channel Flow

    E-Print Network [OSTI]

    Liu, Feng

    1 Turbine-Burner Model: Cavity Flameholding in a Converging, Turning Channel Flow Ben J. Colcord1 of California, Irvine Abstract A review of turbine-burner research and a discussion of some relevant background

  11. High Efficiency Burners by Retrofit - A Simple Inexpensive Way to Improve Combustion Efficiency 

    E-Print Network [OSTI]

    Rogers, W. T.

    1980-01-01

    Existing direct fired process heaters and steam boilers can have their efficiencies remarkably improved, and thus cut the fuel bill, by conversion from conventional type natural draft burners to high intensity, "forced draft" type burners...

  12. Slurry burner for mixture of carbonaceous material and water

    DOE Patents [OSTI]

    Nodd, D.G.; Walker, R.J.

    1985-11-05

    The present invention is intended to overcome the limitations of the prior art by providing a fuel burner particularly adapted for the combustion of carbonaceous material-water slurries which includes a stationary high pressure tip-emulsion atomizer which directs a uniform fuel into a shearing air flow as the carbonaceous material-water slurry is directed into a combustion chamber, inhibits the collection of unburned fuel upon and within the atomizer, reduces the slurry to a collection of fine particles upon discharge into the combustion chamber, and regulates the operating temperature of the burner as well as primary air flow about the burner and into the combustion chamber for improved combustion efficiency, no atomizer plugging and enhanced flame stability.

  13. Identifying Dark Matter Burners in the Galactic center

    E-Print Network [OSTI]

    Igor V. Moskalenko; Lawrence L. Wai

    2007-04-11

    If the supermassive black hole (SMBH) at the center of our Galaxy grew adiabatically, then a dense "spike" of dark matter is expected to have formed around it. Assuming that dark matter is composed primarily of weakly interacting massive particles (WIMPs), a star orbiting close enough to the SMBH can capture WIMPs at an extremely high rate. The stellar luminosity due to annihilation of captured WIMPs in the stellar core may be comparable to or even exceed the luminosity of the star due to thermonuclear burning. The model thus predicts the existence of unusual stars, i.e. "WIMP burners", in the vicinity of an adiabatically grown SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WD) or degenerate cores with envelopes. If found, such stars would provide evidence for the existence of particle dark matter and could possibly be used to establish its density profile. In our previous paper we computed the luminosity from WIMP burning for a range of dark matter spike density profiles, degenerate core masses, and distances from the SMBH. Here we compare our results with the observed stars closest to the Galactic center and find that they could be consistent with WIMP burners in the form of degenerate cores with envelopes. We also cross-check the WIMP burner hypothesis with the EGRET observed flux of gamma-rays from the Galactic center, which imposes a constraint on the dark matter spike density profile and annihilation cross-section. We find that the EGRET data is consistent with the WIMP burner hypothesis. New high precision measurements by GLAST will confirm or set stringent limits on a dark matter spike at the Galactic center, which will in turn support or set stringent limits on the existence of WIMP burners at the Galactic center.

  14. CHP Integrated with Burners for Packaged Boilers- Fact Sheet, April 2014

    Broader source: Energy.gov [DOE]

    Fact sheet overviewing how this project will develop and integrate the Boiler Burner Energy System Technology (BBEST)

  15. Modeling particle loss in ventilation ducts

    SciTech Connect (OSTI)

    Sippola, Mark R.; Nazaroff, William W.

    2003-04-01

    Empirical equations were developed and applied to predict losses of 0.01-100 {micro}m airborne particles making a single pass through 120 different ventilation duct runs typical of those found in mid-sized office buildings. For all duct runs, losses were negligible for submicron particles and nearly complete for particles larger than 50 {micro}m. The 50th percentile cut-point diameters were 15 {micro}m in supply runs and 25 {micro}m in return runs. Losses in supply duct runs were higher than in return duct runs, mostly because internal insulation was present in portions of supply duct runs, but absent from return duct runs. Single-pass equations for particle loss in duct runs were combined with models for predicting ventilation system filtration efficiency and particle deposition to indoor surfaces to evaluate the fates of particles of indoor and outdoor origin in an archetypal mechanically ventilated building. Results suggest that duct losses are a minor influence for determining indoor concentrations for most particle sizes. Losses in ducts were of a comparable magnitude to indoor surface losses for most particle sizes. For outdoor air drawn into an unfiltered ventilation system, most particles smaller than 1 {micro}m are exhausted from the building. Large particles deposit within the building, mostly in supply ducts or on indoor surfaces. When filters are present, most particles are either filtered or exhausted. The fates of particles generated indoors follow similar trends as outdoor particles drawn into the building.

  16. Advanced Burners and Combustion Controls for Industrial Heat Recovery Systems 

    E-Print Network [OSTI]

    Ferri, J. L.

    1988-01-01

    stream_source_info ESL-IE-88-09-52.pdf.txt stream_content_type text/plain stream_size 10271 Content-Encoding ISO-8859-1 stream_name ESL-IE-88-09-52.pdf.txt Content-Type text/plain; charset=ISO-8859-1 ADVANCED BURNERS... AND COMBUSTION CONTROLS FOR INDUSTRIAL HEAT RECOVERY SYSTEMS J.L.FERRI GTE PRODUCTS CORPORATION TOWANDA, PA ABSTRACT When recuperators are installed on indus trial furnaces, burners and ratio control systems must continue to operate reliably under a...

  17. Development of quick repairing technique for ceramic burner in hot stove of blast furnace

    SciTech Connect (OSTI)

    Kondo, Atsushi; Doura, Kouji; Nakamura, Hirofumi [Sumitomo Metal Industries, Ltd., Wakayama (Japan). Wakayama Steel Works

    1997-12-31

    Refractories of ceramic burner in hot stoves at Wakayama No. 4 blast furnace were damaged. There are only three hot stoves, so repairing must be done in a short. Therefore, a quick repairing technique for ceramic burners has been developed, and two ceramic burners were repaired in just 48 hours.

  18. Modeling of Combustion in a Lamella Burner S. PARMENTIER, M. BRAACK, U. RIEDEL and J. WARNATZ

    E-Print Network [OSTI]

    Modeling of Combustion in a Lamella Burner S. PARMENTIER, M. BRAACK, U. RIEDEL and J. WARNATZ burner are performed to predict the temperature profile and the formation of carbon monoxide and nitric process are carried out. Key Word: combustion, modeling, lamella burner, optimization INTRODUCTION

  19. On the Similitude Between Lifted and Burner-Stabilized Triple Flames: A Numerical and Experimental Investigation

    E-Print Network [OSTI]

    Aggarwal, Suresh K.

    On the Similitude Between Lifted and Burner-Stabilized Triple Flames: A Numerical and Experimental first validate our simulations with detailed measurements in more tractable methane­air burner used for investigating the burner-stabilized flames. The similarities and differences between

  20. Simulation of Nitrogen Emissions in a Premixed Hydrogen Flame Stabilized on a Low Swirl Burner

    E-Print Network [OSTI]

    Bell, John B.

    Simulation of Nitrogen Emissions in a Premixed Hydrogen Flame Stabilized on a Low Swirl Burner J. B temperatures. Such flames can be stabilized in a low swirl burner configuration, for example, using a variety in the context of a laboratory-scale low swirl burner fueled with a lean hydrogen-air mixture at atmospheric

  1. A=B: The Case for CAS and Research in High School Mathematics by Justin Burner

    E-Print Network [OSTI]

    Yong, Alexander

    A=B: The Case for CAS and Research in High School Mathematics by Justin Burner Having excelled. The implementation of these devices, however, has been overall lackluster. #12;Burner 2 These devices are primarily does that #12;Burner 3 actually do that?' " [Young 2009]. A basic understanding of computer languages

  2. Identifying Dark Matter Burners in the Galactic center Igor V. Moskalenko*1

    E-Print Network [OSTI]

    Moskalenko, Igor V.

    Identifying Dark Matter Burners in the Galactic center Igor V. Moskalenko*1 and Lawrence L. Wai, i.e. "WIMP burners", in the vicinity of an adiabatically grown SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WD) or degenerate cores

  3. Acoustic Modes in a Ducted Shear Flow Gregory Vilenski

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    Acoustic Modes in a Ducted Shear Flow Gregory Vilenski Sjoerd W. Rienstra Eindhoven University but sheared mean flow inside a duct is considered. For isentropic flow in a circular duct with zero swirl = dimensional inner duct radius d = dimensional outer duct radius = dimensional frequency m = circumferential

  4. Generator stator core vent duct spacer posts

    DOE Patents [OSTI]

    Griffith, John Wesley (Schenectady, NY); Tong, Wei (Clifton Park, NY)

    2003-06-24

    Generator stator cores are constructed by stacking many layers of magnetic laminations. Ventilation ducts may be inserted between these layers by inserting spacers into the core stack. The ventilation ducts allow for the passage of cooling gas through the core during operation. The spacers or spacer posts are positioned between groups of the magnetic laminations to define the ventilation ducts. The spacer posts are secured with longitudinal axes thereof substantially parallel to the core axis. With this structure, core tightness can be assured while maximizing ventilation duct cross section for gas flow and minimizing magnetic loss in the spacers.

  5. VARIABLE FIRING RATE OIL BURNER USING PULSE FUEL FLOW CONTROL.

    SciTech Connect (OSTI)

    KRISHNA,C.R.; BUTCHER,T.A.; KAMATH,B.R.

    2004-10-01

    The residential oil burner market is currently dominated by the pressure-atomized retention head burner, which has an excellent reputation for reliability and efficiency. In this burner, oil is delivered to a fuel nozzle at pressures from 100 to 150 psi. In addition, to atomizing the fuel, the small, carefully controlled size of the nozzle exit orifice serves to control the burner firing rate. Burners of this type are currently available at firing rates of more than 0.5 gallons-per-hour (70,000 Btu/hr). Nozzles have been made for lower firing rates, but experience has shown that such nozzles suffer rapid fouling of the necessarily small passages, leading to bad spray patterns and poor combustion performance. Also, traditionally burners and the nozzles are oversized to exceed the maximum demand. Typically, this is figured as follows. The heating load of the house on the coldest day for the location is considered to define the maximum heat load. The contractor or installer adds to this to provide a safety margin and for future expansion of the house. If the unit is a boiler that provides domestic hot water through the use of a tankless heating coil, the burner capacity is further increased. On the contrary, for a majority of the time, the heating system is satisfying a much smaller load, as only rarely do all these demands add up. Consequently, the average output of the heating system has to be much less than the design capacity and this is accomplished by start and stop cycling operation of the system so that the time-averaged output equals the demand. However, this has been demonstrated to lead to overall efficiencies lower than the steady-state efficiency. Therefore, the two main reasons for the current practice of using oil burners much larger than necessary for space heating are the unavailability of reliable low firing rate oil burners and the desire to assure adequate input rate for short duration, high draw domestic hot water loads. One approach to solve this problem is to develop a burner, which can operate at two firing rates, with the lower rate being significantly lower than 0.5 gallons per hour. This paper describes the initial results of adopting this approach through a pulsed flow nozzle. It has been shown that the concept of flow modulation with a small solenoid valve is feasible. Especially in the second configuration tested, where the Lee valve was integrated with the nozzle, reasonable modulation in flow of the order of 1.7 could be achieved. For this first prototype, the combustion performance is still not quite satisfactory. Improvements in operation, for example by providing a sharp and positive shut-off so that there is no flow under low pressures with consequent poor atomization could lead to better combustion performance. This could be achieved by using nozzles that have shut off or check valves for example. It is recommended that more work in cooperation with the valve manufacturer could produce a technically viable system. Marketability is of course a far more complex problem to be addressed once a technically viable product is available.

  6. Study of the Effects of Ambient Conditions Upon the Performance of Fan Powered, Infrared Natural Gas Burners

    SciTech Connect (OSTI)

    Clark Atlanta University

    2002-12-02

    The objective of this investigation was to characterize the operation of a fan-powered, infrared burner (IR burner) at various gas compositions and ambient conditions, develop numerical model to simulate the burner performances, and provide design guidelines for appliances containing PIR burners for satisfactory performance.

  7. CO-FIRING COAL: FEEDLOT AND LITTER BIOMASS (CFB AND CLB) FUELS IN PULVERIZED FUEL AND FIXED BED BURNERS

    SciTech Connect (OSTI)

    Kalyan Annamalai; John Sweeten; Saqib Mukhtar; Ben Thein; Gengsheng Wei; Soyuz Priyadarsan; Senthil Arumugam; Kevin Heflin

    2003-08-28

    Intensive animal feeding operations create large amounts of animal waste that must be safely disposed of in order to avoid environmental degradation. Cattle feedlots and chicken houses are two examples. In feedlots, cattle are confined to small pens and fed a high calorie grain-diet diet in preparation for slaughter. In chicken houses, thousands of chickens are kept in close proximity. In both of these operations, millions of tons of manure are produced every year. The manure could be used as a fuel by mixing it with coal in a 90:10 blend and firing it in an existing coal suspension fired combustion systems. This technique is known as co-firing, and the high temperatures produced by the coal will allow the biomass to be completely combusted. Reburn is a process where a small percentage of fuel called reburn fuel is injected above the NO{sub x} producing, conventional coal fired burners in order to reduce NO{sub x}. The manure could also be used as reburn fuel for reducing NO{sub x} in coal fired plants. An alternate approach of using animal waste is to adopt the gasification process using a fixed bed gasifier and then use the gases for firing in gas turbine combustors. In this report, the cattle manure is referred to as feedlot biomass (FB) and chicken manure as litter biomass (LB). The report generates data on FB and LB fuel characteristics. Co-firing, reburn, and gasification tests of coal, FB, LB, coal: FB blends, and coal: LB blends and modeling on cofiring, reburn systems and economics of use of FB and LB have also been conducted. The biomass fuels are higher in ash, lower in heat content, higher in moisture, and higher in nitrogen and sulfur (which can cause air pollution) compared to coal. Small-scale cofiring experiments revealed that the biomass blends can be successfully fired, and NO{sub x} emissions will be similar to or lower than pollutant emissions when firing coal. Further experiments showed that biomass is twice or more effective than coal when used in a reburning process. Computer simulations for coal: LB blends were performed by modifying an existing computer code to include the drying and phosphorus (P) oxidation models. The gasification studies revealed that there is bed agglomeration in the case of chicken litter biomass due to its higher alkaline oxide content in the ash. Finally, the results of the economic analysis show that considerable fuel cost savings can be achieved with the use of biomass. In the case of higher ash and moisture biomass, the fuel cost savings is reduced.

  8. OPTIMUM DUCT DESIGN FOR VARIABLE AIR VOLUME SYSTEMS

    E-Print Network [OSTI]

    OPTIMUM DUCT DESIGN FOR VARIABLE AIR VOLUME SYSTEMS By TAECHEOL KIM Master of Science Oklahoma May, 2001 #12;ii OPTIMUM DUCT DESIGN FOR VARIABLE AIR VOLUME SYSTEMS Thesis Approved Volume Systems ............................................. 5 1.2.2. Duct Design Methods

  9. Experimental evaluation of gas filled plenum (GFP) insulation for ducts

    E-Print Network [OSTI]

    Walker, Iain S.; Guillot, Cyril

    2003-01-01

    It is possible that the short duct runs and multiple joints,to greater mixing in actual duct installations in houses,Tout, c/l (°F) Tin, 25mm from duct wall (°C) One heater Tin,

  10. PKA Mediates Constitutive Activation of CFTR in Human Sweat Duct

    E-Print Network [OSTI]

    Reddy, M. M.; Quinton, P. M.

    2009-01-01

    al. 1992), not only in sweat ducts but also in M. M. Reddy,Basal CFTR Activity in Sweat Duct Fig. 6 Effect of cytosolicBasal CFTR Activity in Sweat Duct Fig. 9 Effect of cytosolic

  11. Images in Emergency Medicine: Infected Thyroglossal Duct Cyst

    E-Print Network [OSTI]

    Deaver, Mark J; Silman, Eric F.; Lotfipour, Shahram

    2009-01-01

    Som P. CT of Thyroglossal Duct Cysts. Radiology. 1985; 157:edicine Infected Thyroglossal Duct Cyst Mark J. Deaver, MD,of infected thyroglossal duct cyst was made. The patient was

  12. Viscous Flow in Ducts We want to study the viscous flow in ducts with various velocities, fluids and duct shapes. The basic

    E-Print Network [OSTI]

    Bahrami, Majid

    Viscous Flow in Ducts We want to study the viscous flow in ducts with various velocities, fluids and duct shapes. The basic problem is this: Given the pipe geometry and its added components (e Fluid Mechanics (S 09) Viscous Flow in Ducts 2 103

  13. Double-duct liquid metal magnetohydrodynamic engine

    DOE Patents [OSTI]

    Haaland, Carsten M. (Oak Ridge, TN)

    1995-01-01

    An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has-four pistons and a double duct configuration, with each duct containing sodium potassium liquid metal confined between free pistons located at either end of the duct. The liquid metal is forced to flow back and forth in the duct by the movement of the pistons, which are alternatively driven by an internal combustion process. In the MHD generator, the two LM-MHD ducts pass in close proximity through a Hartmann duct with output transformer. AC power is produced by operating the engine with the liquid metal in the two generator ducts always flowing in counter directions. The amount of liquid metal maintained in the ducts may be varied. This provides a variable stroke length for the pistons. The engine/generator provides variable AC power at variable frequencies that correspond to the power demands of the vehicular propulsion. Also the engine should maintain nearly constant efficiency throughout the range of power usage. Automobiles and trucks could be powered by the invention, with no transmission or power converter devices being required.

  14. Double-duct liquid metal magnetohydrodynamic engine

    DOE Patents [OSTI]

    Haaland, Carsten M. (Oak Ridge, TN)

    1997-01-01

    An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has four pistons and a double duct configuration, with each duct containing sodium potassium liquid metal confined between free pistons located at either end of the duct. The liquid metal is forced to flow back and forth in the duct by the movement of the pistons, which are alternatively driven by an internal combustion process. In the MHD generator, the two LM-MHD ducts pass in close proximity through a Hartmann duct with output transformer. AC power is produced by operating the engine with the liquid metal in the two generator ducts always flowing in counter directions. The amount of liquid metal maintained in the ducts may be varied. This provides a variable stroke length for the pistons. The engine/generator provides variable AC power at variable frequencies that correspond to the power demands of the vehicular propulsion. Also the engine should maintain nearly constant efficiency throughout the range of power usage. Automobiles and trucks could be powered by the invention, with no transmission or power converter devices being required.

  15. Evaluation of a New Ramping Technique for Duct Leakage Testing

    E-Print Network [OSTI]

    1 LBNL-61743 Evaluation of a New Ramping Technique for Duct Leakage Testing Iain S. Walker ramping Technique for Duct Leakage Testing Table of contents Introduction

  16. Integration of HVAC System Design with Simplified Duct Distribution...

    Energy Savers [EERE]

    Integration of HVAC System Design with Simplified Duct Distribution - Building America Top Innovation Integration of HVAC System Design with Simplified Duct Distribution - Building...

  17. A COMPUTATIONAL AND EXPERIMENTAL ANALYSIS OF A DUCTED FAN USED IN VTOL UAV SYSTEMS

    E-Print Network [OSTI]

    Camci, Cengiz

    diameter ducted fan. They have concentrated on the performance of ducted fan VTOL vehicles in crosswind

  18. Saving work to a CD-R using the Optical CD Drive (CD Burner) The new Workstations in the Knowledge Common are equipped with CD Burners

    E-Print Network [OSTI]

    Machel, Hans

    Saving work to a CD-R using the Optical CD Drive (CD Burner) The new Workstations in the Knowledge Common are equipped with CD Burners and when you insert a CD (whether CD-R or CD-RW) into the drive

  19. The Zero Age Main Sequence of WIMP burners

    E-Print Network [OSTI]

    Fairbairn, Malcolm; Edsjo, Joakim

    2008-01-01

    We modify a stellar structure code to estimate the effect upon the main sequence of the accretion of weakly interacting dark matter onto stars and its subsequent annihilation. The effect upon the stars depends upon whether the energy generation rate from dark matter annihilation is large enough to shut off the nuclear burning in the star. Main sequence WIMP burners look much like protostars moving on the Hayashi track, although they are in principle completely stable. We make some brief comments about where such stars could be found, how they might be observed and more detailed simulations which are currently in progress. Finally we comment on whether or not it is possible to link the paradoxically young OB stars found at the galactic centre with WIMP burners.

  20. The zero age main sequence of WIMP burners

    SciTech Connect (OSTI)

    Fairbairn, Malcolm; Scott, Pat; Edsjoe, Joakim

    2008-02-15

    We modify a stellar structure code to estimate the effect upon the main sequence of the accretion of weakly-interacting dark matter onto stars and its subsequent annihilation. The effect upon the stars depends upon whether the energy generation rate from dark matter annihilation is large enough to shut off the nuclear burning in the star. Main sequence weakly-interacting massive particles (WIMP) burners look much like proto-stars moving on the Hayashi track, although they are in principle completely stable. We make some brief comments about where such stars could be found, how they might be observed and more detailed simulations which are currently in progress. Finally we comment on whether or not it is possible to link the paradoxically hot, young stars found at the galactic center with WIMP burners.

  1. The Zero Age Main Sequence of WIMP burners

    E-Print Network [OSTI]

    Malcolm Fairbairn; Pat Scott; Joakim Edsjo

    2008-03-03

    We modify a stellar structure code to estimate the effect upon the main sequence of the accretion of weakly interacting dark matter onto stars and its subsequent annihilation. The effect upon the stars depends upon whether the energy generation rate from dark matter annihilation is large enough to shut off the nuclear burning in the star. Main sequence WIMP burners look much like protostars moving on the Hayashi track, although they are in principle completely stable. We make some brief comments about where such stars could be found, how they might be observed and more detailed simulations which are currently in progress. Finally we comment on whether or not it is possible to link the paradoxically young OB stars found at the galactic centre with WIMP burners.

  2. NUMERICAL SIMULATION OF NATURAL GAS-SWIRL BURNER

    SciTech Connect (OSTI)

    Ala Qubbaj

    2005-03-01

    A numerical simulation of a turbulent natural gas jet diffusion flame at a Reynolds number of 9000 in a swirling air stream is presented. The numerical computations were carried out using the commercially available software package CFDRC. The instantaneous chemistry model was used as the reaction model. The thermal, composition, flow (velocity), as well as stream function fields for both the baseline and air-swirling flames were numerically simulated in the near-burner region, where most of the mixing and reactions occur. The results were useful to interpret the effects of swirl in enhancing the mixing rates in the combustion zone as well as in stabilizing the flame. The results showed the generation of two recirculating regimes induced by the swirling air stream, which account for such effects. The present investigation will be used as a benchmark study of swirl flow combustion analysis as a step in developing an enhanced swirl-cascade burner technology.

  3. Downhole burner systems and methods for heating subsurface formations

    DOE Patents [OSTI]

    Farmayan, Walter Farman (Houston, TX); Giles, Steven Paul (Damon, TX); Brignac, Jr., Joseph Phillip (Katy, TX); Munshi, Abdul Wahid (Houston, TX); Abbasi, Faraz (Sugarland, TX); Clomburg, Lloyd Anthony (Houston, TX); Anderson, Karl Gregory (Missouri City, TX); Tsai, Kuochen (Katy, TX); Siddoway, Mark Alan (Katy, TX)

    2011-05-31

    A gas burner assembly for heating a subsurface formation includes an oxidant conduit, a fuel conduit, and a plurality of oxidizers coupled to the oxidant conduit. At least one of the oxidizers includes a mix chamber for mixing fuel from the fuel conduit with oxidant from the oxidant conduit, an igniter, and a shield. The shield includes a plurality of openings in communication with the oxidant conduit. At least one flame stabilizer is coupled to the shield.

  4. Flow Field Results of the Cambridge Stratified Swirl Burner Using Laser Doppler Anemometer

    E-Print Network [OSTI]

    Zhou, Ruigang; Sweeney, Mark; Hochgreb, Simone

    2012-06-08

    /plain; charset=UTF-8 Turbulence Parameters for Non-Reacting conditions of Cambridge Stratified Swirl Burner Ruigang Zhou 1. Abstract The turbulence parameters of non-reacting conditions of Cambridge Stratified Swirl Burner are of interest... to the community studying the burner. The LDA data [2] was used to calculate key turbulence parameters in axial, radial and tangential directions as well as the total velocity component. This report presents the data processing routines and results...

  5. POSTER: Duct tracking in 3D medical data Martin Petrcek

    E-Print Network [OSTI]

    Pelikan, Josef

    POSTER: Duct tracking in 3D medical data Martin PetrĆ­cek Faculty of Mathematics and Physics Charles 2, 180 81 Praha 8 - Liben Czech Republic martin.horak@volny.cz ABSTRACT Implementing duct tracking interaction when selecting duct branches of interest or correcting possible mistakes in duct path segmentation

  6. Numerical Study of Acoustic Modes in Ducted Shear Flow

    E-Print Network [OSTI]

    Rienstra, Sjoerd W.

    Numerical Study of Acoustic Modes in Ducted Shear Flow Gregory G. Vilenski & Sjoerd W. Rienstra mean flow inside a duct is studied numerically. For isentropic flow in a circular duct with zero swirl 26, 2007 #12;1 Introduction Normal mode analysis of small-amplitude disturbances in an annular duct

  7. Joint Inference of Multiple Label Types in Large Networks Deepayan Chakrabarti DEEPAY@FB.COM

    E-Print Network [OSTI]

    @FB.COM Stanislav Funiak SFUNIAK@FB.COM Jonathan Chang JONCHANG@FB.COM Sofus A. Macskassy SOFMAC@FB.COM Facebook Inc-passing architecture. On a billion-node subset of the Facebook social network, EDGEEXPLAIN signif- icantly outperforms the group from u's actual current city C, causing label propagation to infer C for u. However, our proposed

  8. 01-12-1998 - Bench Top FIre Involving Use of Alcohol and Burner...

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

    1998 - Bench Top FIre Involving Use of Alcohol and Burner Document Number: NA Effective Date: 011998 File (public): 01-12-1998...

  9. Pollutant Exposures from Natural Gas Cooking Burners: A Simulation-Based Assessment for Southern California

    E-Print Network [OSTI]

    Logue, Jennifer M.

    2014-01-01

    P. Sullivan (2009). Natural Gas Variability in California:Singer (2012). Impact of Natural Gas Appliances on PollutantPollutant Exposures in Natural Gas Cooking Burners, LBNL

  10. Modeling Population Exposures to Pollutants Emitted from Natural Gas Cooking Burners

    E-Print Network [OSTI]

    Lobscheid, Agnes

    2012-01-01

    natural gas cooking burners without venting (kitchen exhaust systems) commonly leads to residential NO 2 concentrations that exceed ambient air quality

  11. Mode propagation and attenuation in lined ducts

    E-Print Network [OSTI]

    BI, Wenping

    2014-01-01

    Optimal impedance for each mode is an important concept in an infinitely long duct lined with uniform absorption material. However it is not valid for finite length linings. This is because that the modes in lined ducts are not power-orthogonal; the total sound power is not equal to the sum of the sound power of each mode; cross-power terms may play important roles. In this paper, we study sound propagation and attenuation in an infinite rigid duct lined with a finite length of lining impedance. The lining impedance may be axial segments and circumferentially non-uniform. We propose two new physical quantities Kp and S to describe the self-overlap of the left eigenfunction and right eigenfunction of one mode and the normalized overlap between modes, respectively. The two new physical quantities describe totally the mode behaviors in lined ducts.

  12. Achieving Airtight Ducts in Manufactured Housing 

    E-Print Network [OSTI]

    McIlvaine, J.; Beal, D.; Moyer, N.; Chasar, D.; Chandra, S.

    2004-01-01

    This Florida Solar Energy Center (FSEC) study, conducted under the auspices of the U.S. Department of Energy's Building America Industrialized Housing Partnership (BAIHP), compares mastic sealed duct systems to tape ...

  13. Tips: Air Ducts | Department of Energy

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

    tubes in the walls, floors, and ceilings; it carries the air from your home's furnace and central air conditioner to each room. Ducts are made of sheet metal, fiberglass, or other...

  14. Acoustic imaging of a duct spinning mode by the use of an in-duct circular microphone array

    E-Print Network [OSTI]

    Huang, Xun

    Acoustic imaging of a duct spinning mode by the use of an in-duct circular microphone array Qingkai 2013) An imaging method of acoustic spinning modes propagating within a circular duct simply in a theoretical way and is demonstrated by a numerical simulation case. Nowadays, the measurements within a duct

  15. A Comparison of Simulation Capabilities for Ducts

    SciTech Connect (OSTI)

    Miller, William A.; Smith, Matt K.; Gu, Lixing; New, Joshua Ryan

    2014-11-01

    Typically, the cheapest way to install a central air conditioning system in residential buildings is to place the ductwork in the attic. Energy losses due to duct-attic interactions can be great, but current whole-house models are unable to capture the dynamic multi-mode physics of the interactions. The building industry is notoriously fragmented and unable to devote adequate research resources to solve this problem. Builders are going to continue to put ducts in the attic because floor space is too expensive to closet them within living space, and there are both construction and aesthetic issues with other approaches such as dropped ceilings. Thus, there is a substantial need to publicly document duct losses and the cost of energy used by ducts in attics so that practitioners, builders, homeowners and state and federal code officials can make informed decisions leading to changes in new construction and additional retrofit actions. Thus, the goal of this study is to conduct a comparison of AtticSim and EnergyPlus simulation algorithms to identify specific features for potential inclusion in EnergyPlus that would allow higher-fidelity modeling of HVAC operation and duct transport of conditioned air. It is anticipated that the resulting analysis from these simulation tools will inform energy decisions relating to the role of ducts in future building energy codes and standards.

  16. Slurry burner for mixture of carbonaceous material and water

    DOE Patents [OSTI]

    Nodd, Dennis G. (West Mifflin, PA); Walker, Richard J. (Bethel Park, PA)

    1987-01-01

    A carbonaceous material-water slurry burner includes a high pressure tip-emulsion atomizer for directing a carbonaceous material-water slurry into a combustion chamber for burning therein without requiring a support fuel or oxygen enrichment of the combustion air. Introduction of the carbonaceous material-water slurry under pressure forces it through a fixed atomizer wherein the slurry is reduced to small droplets by mixing with an atomizing air flow and directed into the combustion chamber. The atomizer includes a swirler located immediately adjacent to where the fuel slurry is introduced into the combustion chamber and which has a single center channel through which the carbonaceous material-water slurry flows into a plurality of diverging channels continuous with the center channel from which the slurry exits the swirler immediately adjacent to an aperture in the combustion chamber. The swirler includes a plurality of slots around its periphery extending the length thereof through which the atomizing air flows and by means of which the atomizing air is deflected so as to exert a maximum shear force upon the carbonaceous material-water slurry as it exits the swirler and enters the combustion chamber. A circulating coolant system or boiler feed water is provided around the periphery of the burner along the length thereof to regulate burner operating temperature, eliminate atomizer plugging, and inhibit the generation of sparklers, thus increasing combustion efficiency. A secondary air source directs heated air into the combustion chamber to promote recirculation of the hot combustion gases within the combustion chamber.

  17. Duct injection technology prototype development: Nozzle development Subtask 4. 1, Atomizer specifications for duct injection technology

    SciTech Connect (OSTI)

    Not Available

    1992-02-01

    Babcock Wilcox has conducted a program to identify atomizers appropriate for successful in-duct injection of humidification water and lime slurries. The purpose of this program was to identify and quantify atomizer spray and performance criteria that affect the operations and reliability of the in-duct SO{sub 2} removal process, and compare commercially available atomizers to these criteria.

  18. The Structure of Triple Flames Stabilized on a Slot Burner RICCARDO AZZONI, STEFANO RATTI, SURESH K. AGGARWAL, and

    E-Print Network [OSTI]

    Aggarwal, Suresh K.

    The Structure of Triple Flames Stabilized on a Slot Burner RICCARDO AZZONI, STEFANO RATTI, SURESH K, not clearly understood. Herein, laminar triple flames stabilized on a Wolfhard-Parker slot burner

  19. Development, Application and Performance of Venturi Register L. E. A. Burner System for Firing Oil and Gas Fuels 

    E-Print Network [OSTI]

    Cawte, A. D.

    1979-01-01

    as CEA Combustion, Ltd., to develop a more efficient suspended - flame burner. Subsequently, the CEGB (Central Electric Generating Board) in Great Britain developed standards for register type burners installed in fossil fuel fired electric generating...

  20. Development of a Low NOx Burner System for Coal Fired Power Plants Using Coal and Biomass Blends 

    E-Print Network [OSTI]

    Gomez, Patsky O.

    2010-01-16

    The low NOx burner (LNB) is the most cost effective technology used in coal-fired power plants to reduce NOx. Conventional (unstaged) burners use primary air for transporting particles and swirling secondary air to create recirculation of hot gases...

  1. Experimental and numerical analysis of isothermal turbulent flows in interacting low NOx burners in coal-fired furnaces 

    E-Print Network [OSTI]

    Cvoro, Valentina

    Coal firing power stations represent the second largest source of global NOx emissions. The current practice of predicting likely exit NOx levels from multi-burner furnaces on the basis of single burner test rig data has ...

  2. Pancreatic duct replication is increased with obesity and type 2 diabetes in humans

    E-Print Network [OSTI]

    Butler, A. E.; Galasso, R.; Matveyenko, A.; Rizza, R. A.; Dry, S.; Butler, P. C.

    2010-01-01

    1556-8 ARTICLE Pancreatic duct replication is increased withwe noted increased exocrine duct replication. This is aafter immunostaining for the duct cell marker cytokeratin

  3. Statistical maritime radar duct estimation using hybrid genetic algorithm-Markov chain Monte Carlo method

    E-Print Network [OSTI]

    Yardim, Caglar; Gerstoft, Peter; Hodgkiss, William S.

    2007-01-01

    Estimating evaporation duct heights from radar sea echo,”Estimation of surface-based duct parameters from surfaceapplication of an evaporation duct model,” Radio Science,

  4. Experiments measuring particle deposition from fully developed turbulent flow in ventilation ducts

    E-Print Network [OSTI]

    Sippola, Mark R.; Nazaroff, William W.

    2003-01-01

    of Particles in Vertical Ducts with Smooth and RoughDeposition in Ventilation Ducts, Ph. D. Dissertation,Applicability to Ventilation Ducts in Commercial Buildings,

  5. Development and validation of a combustion model for a fuel cell off-gas burner

    E-Print Network [OSTI]

    Collins, William Tristan

    2008-10-14

    Burner Details 164 C.1 Burner Inlet Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 C.2 Emission Indices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 List of References 173 List of Figures 1.1 SOFC... Steady Laminar Flamelet Model . . . . . . . . . . . . . . . . . . . . . . 16 SOFC Solid Oxide Fuel Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 UDF User De?ned Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73...

  6. Development of the Radiation Stabilized Distributed Flux Burner - Phase III Final Report

    SciTech Connect (OSTI)

    J. D. Sullivan; A. Webb

    1999-12-01

    The development and demonstration of the Radiation Stabilized Burner (RSB) was completed as a project funded by the US Department of Energy Office of Industrial Technologies. The technical goals of the project were to demonstrate burner performance that would meet or exceed emissions targets of 9 ppm NOx, 50 ppm CO, and 9 ppm unburned hydrocarbons (UHC), with all values being corrected to 3 percent stack oxygen, and incorporate the burner design into a new industrial boiler configuration that would achieve ultra-low emissions while maintaining or improving thermal efficiency, operating costs, and maintenance costs relative to current generation 30 ppm low NOx burner installations. Both the ultra-low NOx RSB and the RSB boiler-burner package are now commercially available.

  7. Simulation of Nitrogen Emissions in a Low Swirl Burner J. B. Bell, M. S. Day, X. Gao, M. J. Lijewski

    E-Print Network [OSTI]

    Bell, John B.

    Simulation of Nitrogen Emissions in a Low Swirl Burner J. B. Bell, M. S. Day, X. Gao, M. J, 2010 Abstract We present simulations of a laboratory-scale low swirl burner fueled with hydrogen in a turbulent burner if the fuel mixture is enriched with H2 [8]. Hydrogen addition enhances the effective flame

  8. First archeointensity determinations on Maya incense burners from Palenque temples, Mexico: New data to constrain the Mesoamerica secular

    E-Print Network [OSTI]

    Demouchy, Sylvie

    First archeointensity determinations on Maya incense burners from Palenque temples, Mexico: New Keywords: archeointensity secular variation Palenque incense burner a b s t r a c t We present archeointensity data carried out on pieces of incense burners from the ancient Maya city of Palenque, Chiapas

  9. Aalborg Universitet Coal-firing and biomass-firing in a 150kW swirl stabilized burner flow reactor

    E-Print Network [OSTI]

    Berning, Torsten

    Aalborg Universitet Coal-firing and biomass-firing in a 150kW swirl stabilized burner flow reactor). Coal-firing and biomass-firing in a 150kW swirl stabilized burner flow reactor. Poster session-fired boiler could be far more challenging beca se b rner aerod namicsmore challenging, because burner

  10. Identifying Dark Matter Burners in the Galactic center

    E-Print Network [OSTI]

    Moskalenko, Igor V

    2007-01-01

    If the supermassive black hole (SMBH) at the center of our Galaxy grew adiabatically, then a dense "spike" of dark matter is expected to have formed around it. Assuming that dark matter is composed primarily of weakly interacting massive particles (WIMPs), a star orbiting close enough to the SMBH can capture WIMPs at an extremely high rate. The stellar luminosity due to annihilation of captured WIMPs in the stellar core may be comparable to or even exceed the luminosity of the star due to thermonuclear burning. The model thus predicts the existence of unusual stars, i.e. "WIMP burners", in the vicinity of an adiabatically grown SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WD) or degenerate cores with envelopes. If found, such stars would provide evidence for the existence of particle dark matter and could possibly be used to establish its density profile. In our previous paper we computed the luminosity from WIMP burning for a range of dark ma...

  11. Fundamental investigation of duct/ESP phenomena

    SciTech Connect (OSTI)

    Brown, C.A. (Radian Corp., Austin, TX (United States)); Durham, M.D. (ADA Technologies, Inc., Englewood, CO (United States)); Sowa, W.A. (California Univ., Irvine, CA (United States). Combustion Lab.); Himes, R.M. (Fossil Energy Research Corp., Laguna Hills, CA (United States)); Mahaffey, W.A. (CHAM of North America, Inc., Huntsville, AL (United States))

    1991-10-21

    Radian Corporation was contracted to investigate duct injection and ESP phenomena in a 1.7 MW pilot plant constructed for this test program. This study was an attempt to resolve problems found in previous studies and answer remaining questions for the technology using an approach which concentrates on the fundamental mechanisms of the process. The goal of the study was to obtain a better understanding of the basic physical and chemical phenomena that control: (1) the desulfurization of flue gas by calcium-based reagent, and (2) the coupling of an existing ESP particulate collection device to the duct injection process. Process economics are being studied by others. (VC)

  12. Closing the Wedge with 300 fb^-1 and 3000 fb^-1 at the LHC: A Snowmass White Paper

    E-Print Network [OSTI]

    Ian M. Lewis

    2013-08-08

    The discovery of a Higgs boson at the LHC begins the era of directly measuring the mechanism of electroweak symmetry breaking (EWSB). Searching for extensions of the Standard Model (SM) EWSB sector at the LHC is of vital importance. An important extension of the SM with an extended EWSB sector is the Minimal Supersymmetric Standard Model (MSSM). In this white paper, we extend current ATLAS and CMS bounds on direct searches for the heavy MSSM neutral Higgs bosons to 300 fb^-1 and 3000 fb^-1 of data at the LHC. In particular we focus on the \\tau^+\\tau^- channel and the pseudoscalar decay to light Higgs boson and Z, with additional discussion on how to further close the wedge.

  13. Duct Leakage Impacts on VAV System Performance in California Large

    E-Print Network [OSTI]

    LBNL-53605 Duct Leakage Impacts on VAV System Performance in California Large Commercial Buildings and for implementing the duct models in a form that could readily be used in this project; and Brian Smith (LBNL

  14. Building America Top Innovations 2013 Profile – Buried and Encapsulated Ducts

    SciTech Connect (OSTI)

    2013-09-01

    In this innovation profile, CARB research shows HVAC ducts that are encapsulated in closed-cell spray foam and buried in blown insulation in a vented attic meet the code requirements for ducts in conditioned space.

  15. Microsoft Word - VitPlantInstallsCrucialDuct_20110209.doc

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

    Treatment Plant, also known as the "Vit Plant," set a giant heating, ventilation and air-conditioning (HVAC) duct in the High-Level Waste Facility. The nuclear-quality duct is...

  16. Minimizing Energy Losses in Ducts | Department of Energy

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

    is critical. In recent years, energy-saving designs have sought to include ducts and heating systems in the conditioned space. Many existing duct systems lose a lot of energy...

  17. Potential Flow Calculations of Axisymmetric Ducted Wind Turbines

    E-Print Network [OSTI]

    Widnall, Sheila

    2009-09-02

    An incompressible potential-flow vortex method has been constructed to analyze the flow field of a ducted

  18. A ``NEW'' APPROACH TO ACTIVE NOISE CONTROL IN DUCTS 1

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    A ``NEW'' APPROACH TO ACTIVE NOISE CONTROL IN DUCTS 1 Prashant Mehta 2 , Yuan Zheng 3 , Yossi Chait consider the fixed­filter design ap­ proach for active noise control (ANC) in ducts. Based on a large body.e., a duct equipped with both feedforward and feedback sensors and a control speaker. Our design of a linear

  19. LBNL-41434. CAN DUCT-TAPE TAKE THE HEAT?

    E-Print Network [OSTI]

    LBNL-41434. 1 CAN DUCT-TAPE TAKE THE HEAT? Max Sherman Iain Walker Energy Performance of Buildings Group Lawrence Berkeley National Laboratory University of California Duct leakage has been identified as a major source of energy loss in residential buildings. Most duct leakage occurs at the connections

  20. Clutter-Based Evaporation Duct Estimation Performance Using Meteorological Statistics

    E-Print Network [OSTI]

    Gerstoft, Peter

    Clutter-Based Evaporation Duct Estimation Performance Using Meteorological Statistics Caglar Yardim in different regions of the world with varying duct strengths and statistics. The performance of evaporation duct estimation is investigated in littoral zones such as the North Sea, Wallops Island, Coast

  1. Cuton, cutoff transition of sound in slowly varying flow ducts

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    Cut­on, cut­off transition of sound in slowly varying flow ducts Sjoerd W. Rienstra 19­walled duct with irrotational isentropic mean flow is studied. The usual turning point behaviour was found. 1 Introduction The exact multiple scale solution for sound propagation in a slowly varying lined flow duct

  2. DOUBLE DUCTED FAN (DDF) Cengiz Camci and Ali Akturk

    E-Print Network [OSTI]

    Camci, Cengiz

    DOUBLE DUCTED FAN (DDF) By Cengiz Camci and Ali Akturk A technology description document a novel ducted fan inlet flow conditioning concept that will significantly improve the performance" and many other ducted fan based systems. The new concept that will significantly reduce the inlet lip

  3. Longevity of Duct Tape in Residential Air Distribution

    E-Print Network [OSTI]

    LBNL 51099 Longevity of Duct Tape in Residential Air Distribution Systems: 1-D, 2-D, and 3-D Joints involved the aging of common "core-to-collar joints" of flexible duct to sheet metal collars, and sheet consisted of baking duct tape specimens in a constant 212°F (100°C) oven following the UL 181B

  4. SOUND PROPAGATION IN SLOWLY VARYING LINED FLOW DUCTS

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    SOUND PROPAGATION IN SLOWLY VARYING LINED FLOW DUCTS OF ARBITRARY CROSS SECTION S.W. Rienstra.w.rienstra@tue.nl November 20, 2002 Abstract Sound transmission through ducts of constant cross section with a uniform expansion, where the modes are eigenfunctions of the corresponding Laplace eigenvalue problem along a duct

  5. ORIGINAL ARTICLE A Mathematical Model of the Pancreatic Duct Cell

    E-Print Network [OSTI]

    Ermentrout, G. Bard

    ORIGINAL ARTICLE A Mathematical Model of the Pancreatic Duct Cell Generating High Bicarbonate a simple, physiologically based mathemati- cal model of pancreatic duct cell secretion using experimentally CFTR activation. Methods: A new mathematical model was developed simulating a duct cell within

  6. Improved Wireless Performance from Mode Scattering in Ventilation Ducts

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Improved Wireless Performance from Mode Scattering in Ventilation Ducts Benjamin E. Henty, PA 15230. henty@eirp.org and stancil@cmu.edu Abstract Ventilation ducts are a convenient undesirable in a ven- tilation duct setting. With this in mind we investigate the mode scattering effects

  7. Nucleonic analysis of the ETF neutral-beam-injector-duct and vacuum-pumping-duct shields

    SciTech Connect (OSTI)

    Urban, W.T.; Seed, T.J.; Dudziak, D.J.

    1981-05-01

    A nucleonic analysis of the Engineering Test Facility neutral-beam-injector-duct and vacuum-pumping-duct shields has been made using a hybrid Monte Carlo/discrete-ordinates method. This method used Monte Carlo to determine internal and external boundary surface sources for subsequent discrete-ordinates calculations of the neutron and gamma-ray transport through the shields. Confidence was provided in both the hybrid method and the results obtained through a comparison with three-dimensional Monte Carlo results. Also determined in the analysis were the energy and angular distributions of neutrons and gamma rays entering the neutral-beam-injector duct from the toroidal plasma chamber, as well as exiting the duct into the neutral-beam-injector chamber. In addition, the energy and angular distributions of neutrons entering the vacuum-pumping chamber were determined.

  8. LBNL -53547 Advanced Duct Sealant Testing

    E-Print Network [OSTI]

    for Energy Efficiency and Renewable Energy, Office of Building Technology, State and Community Programs: Philip Spartz PIER Program Area: Buildings End Use Energy Efficiency PIER Program Area Lead: Nancy contributes to the Buildings End-Use Energy Efficiency program. 4 #12;Executive Summary Duct leakage has been

  9. Optimization of burners for firing solid fuel and natural gas for boilers with impact pulverizers

    SciTech Connect (OSTI)

    G.T. Levit; V.Ya. Itskovich; A.K. Solov'ev (and others) [ORGRES Company (Russian Federation)

    2003-01-15

    The design of a burner with preliminary mixing of fuel and air for alternate or joint firing of coal and natural gas on a boiler is described. The burner provides steady ignition and economical combustion of coal, low emission of NOx in both operating modes, and possesses an ejecting effect sufficient for operation of pulverizing systems with a shaft mill under pressure. The downward inclination of the burners makes it possible to control the position of the flame in the furnace and the temperature of the superheated steam.

  10. Comparative Testing of the Combined Radiant Barrier and Duct Models in the ESL's Code-Compliant Simulation Model 

    E-Print Network [OSTI]

    Kim, S.; Haberl, J. S.

    2007-07-10

    model and the EnergyGauge program by the Florida Solar Energy Center (FSEC). Sensitivity analyses were performed by varying duct insulation level, supply duct area, return duct area, supply duct leakage, return duct leakage, and ceiling insulation levels...

  11. Compressed supersymmetry after 1 fb?¹ at the Large Hadron Collider

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

    LeCompte, Thomas J.; Martin, Stephen P.

    2012-02-01

    We study the reach of the Large Hadron Collider with 1 fb?¹ of data at ?s=7 TeV for several classes of supersymmetric models with compressed mass spectra, using jets and missing transverse energy cuts like those employed by ATLAS for summer 2011 data. In the limit of extreme compression, the best limits come from signal regions that do not require more than 2 or 3 jets and that remove backgrounds by requiring more missing energy rather than a higher effective mass.

  12. Particle deposition in ventilation ducts: Connectors, bends anddeveloping flow

    SciTech Connect (OSTI)

    Sippola, Mark R.; Nazaroff, William W.

    2004-03-01

    In ventilation duct flow the turbulent flow profile is commonly disturbed or not fully developed and these conditions are likely to influence particle deposition to duct surfaces. Particle deposition rates at eight S-connectors, in two 90{sup o} duct bends and in two ducts where the turbulent flow profile was not fully developed were measured in a laboratory duct system with both galvanized steel and internally insulated ducts with hydraulic diameters of 15.2 cm. In the steel duct system, experiments with nominal particle diameters of 1, 3, 5, 9 and 16 {micro}m were conducted at each of three nominal air speeds: 2.2, 5.3 and 9.0 m/s. In the insulated duct system, deposition of particles with nominal diameters of 1, 3, 5, 8 and 13 {micro}m was measured at nominal air speeds of 2.2, 5.3 and 8.8 m/s. Fluorescent techniques were used to directly measure the deposition velocities of monodisperse fluorescent particles to duct surfaces. Deposition at S-connectors, in bends and in straight ducts with developing turbulence was often greater than deposition in straight ducts with fully developed turbulence for equal particle sizes, air speeds and duct surface orientations. Deposition rates at all locations were found to increase with an increase in particle size or air speed. High deposition rates at S-connectors resulted from impaction and these rates were nearly independent of the orientation of the S-connector. Deposition rates in the two 90{sup o} bends differed by more than an order of magnitude in some cases, probably because of the difference in turbulence conditions at the bend inlets. In straight steel ducts where the turbulent flow profile was developing, the deposition enhancement relative to fully developed turbulence generally increased with air speed and decreased with downstream distance from the duct inlet. This enhancement was greater at the duct ceiling and wall than at the duct floor. In insulated ducts, deposition enhancement was less pronounced overall than in steel ducts. Trends that were observed in steel ducts were present, but weaker, in insulated ducts.

  13. Variable firing rate power burner for high efficiency gas furnaces. Final report

    SciTech Connect (OSTI)

    Fuller, H.H.; Demler, R.L.; Poulin, E.

    1980-02-01

    One method for increasing the efficiency of residential furnaces and boilers is to retrofit a burner capable of firing rate (FR) modulation. While maximum FR is still attainable, the average FR is significantly lower, resulting in more effective heat exchanger performance. Equally important is the capability for continuous firing at a very low rate (simmering) which eliminates off-cycle loss, a heavy contributor to inefficiency. Additional performance can be gained by reducing the excess air required by a burner. Based on its previous experience, Foster-Miller Associates, Inc. has designed and tested a low excess air (about 15%) variable firing rate (VFR) burner. The theory of operation and the construction of the test burner are described. Test results are given along with a conclusion/recommendation. A Phase II plan is outlined which suggests methods and steps for fabrication and field testing of a number of prototype units.

  14. Low NO sub x /SO sub x Burner retrofit for utility cyclone boilers

    SciTech Connect (OSTI)

    Not Available

    1991-01-01

    Work on process design and LNS Burner design was deferred during this period, pending a reassessment of the project by TransAlta prior to commencement of Budget Period II, and only limited Balance of Plant engineering work was done.

  15. Low-Emissions Burner Technology using Biomass-Derived Liquid Fuels

    SciTech Connect (OSTI)

    2010-07-01

    The University of Alabama will develop fuel-flexible, low-emissions burner technology for the metal processing industry that is capable of using biomass-derived liquid fuels, such as glycerin or fatty acids, as a substitute for natural gas. By replacing a fossil fuel with biomass fuels, this new burner will enable a reduction in energy consumption and greenhouse gas emissions and an increase in fuel flexibility.

  16. Low No sub x /SO sub x burner retrofit for utility cyclone boilers

    SciTech Connect (OSTI)

    Moore, K.; Martin, L.; Smith, J.

    1991-05-01

    The Low NO{sub x}/SO{sub x} (LNS) Burner Retrofit for Utility Cyclone Boilers program consists of the retrofit and subsequent demonstration of the technology at Southern Illinois Power Cooperative's (SIPC's) 33-MW unit 1 cyclone boiler located near Marion, Illinois. The LNS Burner employs a simple innovative combustion process burning high-sulfur Illinois coal to provide substantial SO{sub 2} and NO{sub x} control within the burner. A complete series of boiler performance and characterization tests, called the baseline tests, was conducted in October 1990 on unit 1 of SIPC's Marion Station. The primary objective of the baseline test was to collect data from the existing plant that could provide a comparison of performance after the LNS Burner retrofit. These data could confirm the LNS Burner's SO{sub x} and NO{sub x} emissions control and any effect on boiler operation. Further, these tests would provide to the project experience with the operating characteristics of the host unit as well as engineering design information to minimize technical uncertainties in the application of the LNS Burner technology.

  17. Preliminary safety evaluation of the advanced burner test reactor.

    SciTech Connect (OSTI)

    Dunn, F. E.; Fanning, T. H.; Cahalan, J. E.; Nuclear Engineering Division

    2006-09-15

    Results of a preliminary safety evaluation of the Advanced Burner Test Reactor (ABTR) pre-conceptual design are reported. The ABTR safety design approach is described. Traditional defense-in-depth design features are supplemented with passive safety performance characteristics that include natural circulation emergency decay heat removal and reactor power reduction by inherent reactivity feedbacks in accidents. ABTR safety performance in design-basis and beyond-design-basis accident sequences is estimated based on analyses. Modeling assumptions and input data for safety analyses are presented. Analysis results for simulation of simultaneous loss of coolant pumping power and normal heat rejection are presented and discussed, both for the case with reactor scram and the case without reactor scram. The analysis results indicate that the ABTR pre-conceptual design is capable of undergoing bounding design-basis and beyond-design-basis accidents without fuel cladding failures. The first line of defense for protection of the public against release of radioactivity in accidents remains intact with significant margin. A comparison and evaluation of general safety design criteria for the ABTR conceptual design phase are presented in an appendix. A second appendix presents SASSYS-1 computer code capabilities and modeling enhancements implemented for ABTR analyses.

  18. DOE Challenge Home Technical Training - Ducts in Conditioned...

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

    of the U.S. Department of Energy Challenge Home program: Design Options for Locating Ducts within Conditioned Space. challengehometechnicaltraining.pdf More Documents &...

  19. Leaf seal for transition duct in turbine system

    DOE Patents [OSTI]

    Flanagan, James Scott; LeBegue, Jeffrey Scott; McMahan, Kevin Weston; Dillard, Daniel Jackson; Pentecost, Ronnie Ray

    2013-06-11

    A turbine system is disclosed. In one embodiment, the turbine system includes a transition duct. The transition duct includes an inlet, an outlet, and a passage extending between the inlet and the outlet and defining a longitudinal axis, a radial axis, and a tangential axis. The outlet of the transition duct is offset from the inlet along the longitudinal axis and the tangential axis. The transition duct further includes an interface member for interfacing with a turbine section. The turbine system further includes a leaf seal contacting the interface member to provide a seal between the interface member and the turbine section.

  20. Buried and Encapsulated Ducts, Jacksonville, Florida (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2013-11-01

    Ductwork installed in unconditioned attics can significantly increase the overall heating and cooling costs of residential buildings. In fact, estimated duct thermal losses for single-family residential buildings with ductwork installed in unconditioned attics range from 10% to 45%. In a study of three single-story houses in Florida, the Building America research team Consortium for Advanced Residential Buildings (CARB) investigated the strategy of using buried and/or encapsulated ducts (BED) to reduce duct thermal losses in existing homes. The BED strategy consists of burying ducts in loose-fill insulation and/or encapsulating them in closed cell polyurethane spray foam (ccSPF) insulation. There are three possible combinations of BED strategies: (1) buried ducts; (2) encapsulated ducts (with ccSPF); and (3) buried and encapsulated ducts. The best solution for each situation depends on the climate, age of the house, and the configuration of the HVAC system and attic. For new construction projects, the team recommends that ducts be both encapsulated and buried as the minimal planning and costs required for this will yield optimal energy savings. The encapsulated/buried duct strategy, which utilizes ccSPF to address condensation concerns, is an approach that was developed specifically for humid climates.

  1. Flexible metallic seal for transition duct in turbine system

    SciTech Connect (OSTI)

    Flanagan, James Scott; LeBegue, Jeffrey Scott; McMahan, Kevin Weston; Dillard, Daniel Jackson; Pentecost, Ronnie Ray

    2014-04-22

    A turbine system is disclosed. In one embodiment, the turbine system includes a transition duct. The transition duct includes an inlet, an outlet, and a passage extending between the inlet and the outlet and defining a longitudinal axis, a radial axis, and a tangential axis. The outlet of the transition duct is offset from the inlet along the longitudinal axis and the tangential axis. The transition duct further includes an interface member for interfacing with a turbine section. The turbine system further includes a flexible metallic seal contacting the interface member to provide a seal between the interface member and the turbine section.

  2. Evaluation of friction loss in flexible and galvanized duct 

    E-Print Network [OSTI]

    Zimmermann, Carlos Michael Alberto

    1985-01-01

    runs and in 90 degree elbows at various center line radii to diameter ratios (r/d). Three, 3. 658 meter (m) (12 ft) sections of straight, flexible 152 millimeter (mm) (6 in) and 203 sss (8 in) duct and three, 3. 048 m (10 ft) sections of straight... mean data and that ail three factors (duct size, duct type and air flow volume) contribute to this difference. Three sections of each type (flexible and galvanized) and size (152 and 203 sws) duct were tested in 90 degree elbows at five different r/d...

  3. Improving Building Envelope and Duct Airtightness of US Dwellings...

    Office of Scientific and Technical Information (OSTI)

    Conference: Improving Building Envelope and Duct Airtightness of US Dwellings - the Current State of Energy Retrofits Citation Details In-Document Search Title: Improving Building...

  4. Duct injection technology prototype development: Evaluation of engineering data

    SciTech Connect (OSTI)

    Not Available

    1990-07-01

    The objective of the Duct Injection Technology Prototype Development Project is to develop a sound design basis for applying duct injection technology as a post-combustion SO{sub 2}emissions control method to existing coal-fired power plants. The necessary engineering design and scale-up criteria will be developed for the commercialization of duct injection technology for the control of SO{sub 2} emissions from coal-fired boilers in the utility industry. The primary focus of the analyses summarized in this Topical Report is the review of the known technical and economic information associated with duct injection technology. (VC)

  5. Tips: Air Ducts | Department of Energy

    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:Financing ToolInternational Affairs,Department of EnergyPROGRAM TheMetalThomasPhaseofAir Ducts

  6. Numerically-based ducted propeller design using vortex lattice lifting line theory

    E-Print Network [OSTI]

    Stubblefield, John M

    2008-01-01

    This thesis used vortex lattice lifting line theory to model an axisymmetrical-ducted propeller with no gap between the duct and the propeller. The theory required to model the duct and its interaction with the propeller ...

  7. DEVELOPING FLOW AND HEAT TRANSFER IN STRONGLY CURVED DUCTS OF RECTANGULAR CROSS-SECTION

    E-Print Network [OSTI]

    Yee, G.

    2010-01-01

    123. HUMPHREY, J.A.C. , "Flow in Ducts with Curvature andViscous Flow in Curved Ducts of Rectangular Cross-Sections,"Laminar Flow in a Square Duct of Strong Curvature,1I J.

  8. Contributions to the theory of soundpropagation in ducts with bulk-reacting lining

    E-Print Network [OSTI]

    Rienstra, Sjoerd W.

    Contributions to the theory of soundpropagation in ducts with bulk-reacting lining S.W. Rienstra interfaceduct/liner modalamplitudeductfield outer radius duct with liner modalamplitudelinerfield wavenumber duct radial wavenumber liner axial wavenumber smallparameter ratioradialpressuregradientsat

  9. The Delta Q method of testing the air leakage of ducts

    E-Print Network [OSTI]

    Walker, I.S.; Dickerhoff, D.J.; Sherman, M.H.

    2002-01-01

    2001. Development of a new duct leakage test: DeltaQ. L B Nin the DeltaQ test for Duct Leakage. Brookhaven Nationalof the DeltaQ test for Duct Leakage. Proc. A C E E E 2002

  10. Duct Systems in large commercial buildings: Physical characterization, air leakage, and heat conduction gains

    E-Print Network [OSTI]

    Fisk, W.J.

    2011-01-01

    LBNL-42339 Duct Systems in Large Commercial Buildings:and conduction heat gains of duct systems. Different methodscompared. ELAs-of supply ducts ranged from 0.4 to 2.0 cm 2

  11. Effects of Duct Improvement and ENERGYSTAR Equipment on Comfort and Energy Efficiency

    E-Print Network [OSTI]

    LBNL 43723 Effects of Duct Improvement and ENERGYSTAR Equipment on Comfort and Energy Efficiency I................................................................................................................................................ 5 DUCT LEAKAGE AND ENERGYSTAR EQUIPMENT EFFECTS ON COMFORT .................................... 5).......................................................................................................9 Duct leakage by pressurization

  12. Design and development of plugged lactiferous duct treatment technology for nursing women

    E-Print Network [OSTI]

    Mellor, Xochitl L

    2015-01-01

    Plugged lactiferous ducts are a common problem that many nursing women encounter. This occurs when the tissue around a milk duct has become inflamed, thus preventing milk from passing through the duct. Women treat and ...

  13. Slow sound in lined flow ducts

    E-Print Network [OSTI]

    Auregan, Yves

    2015-01-01

    We consider the acoustic propagation in lined flow duct with a purely reactive impedance at the wall. This reacting liner has the capability to reduce the speed of sound, and thus to enhance the interaction between the acoustic propagation and the low Mach number flow ($M\\simeq0.3$). At the lower frequencies, there are typically 4 acoustic or hydrodynamic propagating modes, with 3 of them propagating in the direction of the flow. Above a critical frequency, there are only 2 propagating modes that all propagate in the direction of the flow. From the exact 2D formulation an approximate 1D model is developed to study the scattering of acoustic waves in a straight duct with varying wall impedance. This simple system, with a uniform flow and with a non-uniform liner impedance at the wall, permits to study the scattering between regions with different waves characteristics. Several situations are characterized to show the importance of negative energy waves, strong interactions between acoustic and hydrodynamic mod...

  14. Economizer Applications in Dual-Duct Air-Handling Units 

    E-Print Network [OSTI]

    Joo, I.; Liu, M.

    2002-01-01

    for dual-fan, dual-duct air-handling units. The economizer has significant heating energy penalties for single-fan, dual-duct air-handling units. The penalties are higher than the cooling energy savings when the cold airflow is less than the hot airflow...

  15. Duct thermal performance models for large commercial buildings

    SciTech Connect (OSTI)

    Wray, Craig P.

    2003-10-01

    Despite the potential for significant energy savings by reducing duct leakage or other thermal losses from duct systems in large commercial buildings, California Title 24 has no provisions to credit energy-efficient duct systems in these buildings. A substantial reason is the lack of readily available simulation tools to demonstrate the energy-saving benefits associated with efficient duct systems in large commercial buildings. The overall goal of the Efficient Distribution Systems (EDS) project within the PIER High Performance Commercial Building Systems Program is to bridge the gaps in current duct thermal performance modeling capabilities, and to expand our understanding of duct thermal performance in California large commercial buildings. As steps toward this goal, our strategy in the EDS project involves two parts: (1) developing a whole-building energy simulation approach for analyzing duct thermal performance in large commercial buildings, and (2) using the tool to identify the energy impacts of duct leakage in California large commercial buildings, in support of future recommendations to address duct performance in the Title 24 Energy Efficiency Standards for Nonresidential Buildings. The specific technical objectives for the EDS project were to: (1) Identify a near-term whole-building energy simulation approach that can be used in the impacts analysis task of this project (see Objective 3), with little or no modification. A secondary objective is to recommend how to proceed with long-term development of an improved compliance tool for Title 24 that addresses duct thermal performance. (2) Develop an Alternative Calculation Method (ACM) change proposal to include a new metric for thermal distribution system efficiency in the reporting requirements for the 2005 Title 24 Standards. The metric will facilitate future comparisons of different system types using a common ''yardstick''. (3) Using the selected near-term simulation approach, assess the impacts of duct system improvements in California large commercial buildings, over a range of building vintages and climates. This assessment will provide a solid foundation for future efforts that address the energy efficiency of large commercial duct systems in Title 24. This report describes our work to address Objective 1, which includes a review of past modeling efforts related to duct thermal performance, and recommends near- and long-term modeling approaches for analyzing duct thermal performance in large commercial buildings.

  16. Gas-phase and catalytic combustion in heat-recirculating burners Jeongmin Ahn, Craig Eastwood, Lars Sitzki* and Paul D. Ronney

    E-Print Network [OSTI]

    1 Gas-phase and catalytic combustion in heat-recirculating burners Jeongmin Ahn, Craig Eastwood title: Extinction limits in excess enthalpy burners To be published in Proceedings of the Combustion-phase and catalytic combustion in heat-recirculating burners Jeongmin Ahn, Craig Eastwood, Lars Sitzki* and Paul D

  17. Duct injection technology prototype development: Nozzle development Subtask 4.1, Atomizer specifications for duct injection technology. Topical report 8

    SciTech Connect (OSTI)

    Not Available

    1992-02-01

    Babcock & Wilcox has conducted a program to identify atomizers appropriate for successful in-duct injection of humidification water and lime slurries. The purpose of this program was to identify and quantify atomizer spray and performance criteria that affect the operations and reliability of the in-duct SO{sub 2} removal process, and compare commercially available atomizers to these criteria.

  18. Core design studies for advanced burner test reactor.

    SciTech Connect (OSTI)

    Yang, W. S.; Kim, T. K.; Hill, R. N.; Nuclear Engineering Division

    2008-01-01

    The U.S. government announced in February 2006 the Global Nuclear Energy Partnership (GNEP) to expand the use of nuclear energy to meet increasing global energy demand, to address nuclear waste management concerns and to promote non-proliferation. The advanced burner reactor (ABR) based on a fast spectrum is one of the three major technologies to be demonstrated in GNEP. In FY06, a pre-conceptual design study was performed to develop an advanced burner test reactor (ABTR) that supports development of a prototype full-scale ABR, which would be followed by commercial deployment of ABRs. The primary objectives of the ABTR were (1) to demonstrate reactor-based transmutation of transuranics (TRU) as part of an advanced fuel cycle, (2) to qualify the TRU-containing fuels and advanced structural materials needed for a full-scale ABR, (3) to support the research, development and demonstration required for certification of an ABR standard design by the U.S. Nuclear Regulatory Commission. Based on these objectives, core design and fuel cycle studies were performed to develop ABTR core designs, which can accommodate the expected changes of the TRU feed and the conversion ratio. Various option and trade-off studies were performed to determine the appropriate power level and conversion ratio. Both ternary metal alloy (U-TRU-10Zr) and mixed oxide (UO{sub 2}-TRUO{sub 2}) fuel forms have been considered with TRU feeds from weapons-grade plutonium (WG-Pu) and TRU recovered from light water reactor spent fuel (LWR-SF). Reactor performances were evaluated in detail including equilibrium cycle core parameters, mass flow, power distribution, kinetic parameters, reactivity feedback coefficient, reactivity control requirements and shutdown margins, and spent fuel characteristics. Trade-off studies on power level suggested that about 250 MWt is a reasonable compromise to allow a low project cost, at the same time providing a reasonable prototypic irradiation environment for demonstrating TRU-based fuels. Preliminary design studies showed that it is feasible to design the ABTR to accommodate a wide range of conversion ratio (CR) by employing different assembly designs. The TRU enrichments required for various conversion ratios and the irradiation database suggested a phased approach with initial startup using conventional enrichment plutonium-based fuel and gradual transitioning to full core loading of transmutation fuel after its qualification phase (resulting in {approx}0.6 CR). The low CR transmutation fuel tests can be accommodated in the designated test assemblies, and if fully developed, core conversion to low CR fuel can be envisioned. Reference ABTR core designs with a rated power of 250 MWt were developed for ternary metal alloy and mixed oxide fuels based on WG-Pu feed. The reference core contains 54 driver, 6 test fuel, and 3 test material assemblies. For the startup core designs, the calculated TRU conversion ratio is 0.65 for the metal fuel core and 0.64 for the oxide fuel core. Both the metal and oxide cores show good performances. The metal fuel core requires an average TRU enrichment of 18.8% and yields a reactivity swing of 1.2 %{Delta}k over the 4-month cycle. The core average flux level is {approx}2.4 x 10{sup 15} n/cm{sup 2}s, and test assembly flux level is {approx}2.8 x 10{sup 15} n/cm{sup 2}s. Compared to the metal fuel core, the lower density oxide fuel core requires an average TRU enrichment of 21.8%, which results in a 780 kg TRU loading (as compared to 732 kg for metal) despite a {approx}9% smaller heavy metal inventory. The lower heavy metal inventory increases the burnup reactivity swing by {approx}10% and reduces the flux levels by {approx}8%. Alternative designs were also studied for a LWR-SF TRU feed and a low conversion ratio, including the recycle of the ABTR spent fuel TRU. The lower fissile contents of the LWR-SF TRU relative to the WG-Pu TRU significantly increase the required TRU enrichment of the startup cores to maintain the same cycle length. The even lower fissile fraction of the ABTR spent fuel TRU furt

  19. Transition to turbulence in duct flow

    E-Print Network [OSTI]

    Biau, Damien; Bottaro, Alessandro; 10.1017/S0022112007009536

    2010-01-01

    The transition of the flow in a duct of square cross-section is studied. Like in the similar case of the pipe flow, the motion is linearly stable for all Reynolds numbers; this flow is thus a good candidate to investigate the 'bypass' path to turbulence. Initially the so-called 'linear optimal perturbation problem' is formulated and solved, yielding optimal disturbances in the form of longitudinal vortices. Such optimals, however, fail to elicit a significant response from the system in the nonlinear regime. Thus, streamwise-inhomogeneous, sub-optimal disturbances are focussed upon; nonlinear quadratic interactions are immediately evoked by such initial perturbations and an unstable streamwise-homogeneous large amplitude mode rapidly emerges. The subsequent evolution of the flow, at a value of the Reynolds number at the edge between fully developed turbulence and relaminarization, shows the alternance of patterns with two pairs of large scale vortices near opposing parallel walls. Such edge states bear a rese...

  20. Establishing criteria for the design of a combination parallel and cross-flaming covered burner 

    E-Print Network [OSTI]

    Stark, Christopher Charles

    2003-01-01

    A burner was designed and constructed to combine weed control practices of parallel and cross-flaming with the technology of covers and insulation. It involved two covers designed to be placed on the sides of a crop row. The flame under the covers...

  1. Performance of a small scale boiler burner in the firing of fuel blends 

    E-Print Network [OSTI]

    Frazzitta, Stephen

    1993-01-01

    of the feedlot manure. A small scale boiler burner facility has been constructed to simulate a utility class boiler. Experiments were conducted with coal only and then for coal/feedlot manure. Three types of feedlot manure are examined; raw feedlot manure...

  2. Measurement and analysis of heating of paper with gas-fired infrared burner 

    E-Print Network [OSTI]

    Husain, Abdullah Nadir

    2000-01-01

    . Gas-fired IR heaters produce combustion on the burner surface by ignition of a pre-mixed air and fuel streams. The combustion raises the surface temperature to ranges of 800-1,100°C to emit radiation, mainly in the medium IR range, which has a...

  3. TURBULENT COMBUSTION MODELING OF COAL:BIOMASS BLENDS IN A SWIRL BURNER I -PRELIMINARY RESULTS

    E-Print Network [OSTI]

    Daripa, Prabir

    coal or by ex- haust clean up technology. For the power plants, the simplest solution is the preventive- ity well into the 21st century. This dependency on coal calls for better technologies to reduceTURBULENT COMBUSTION MODELING OF COAL:BIOMASS BLENDS IN A SWIRL BURNER I - PRELIMINARY RESULTS

  4. Low No{sub x}/SO{sub x} burner retrofit for utility cyclone boilers. Baseline test report: Issue A

    SciTech Connect (OSTI)

    Moore, K.; Martin, L.; Smith, J.

    1991-05-01

    The Low NO{sub x}/SO{sub x} (LNS) Burner Retrofit for Utility Cyclone Boilers program consists of the retrofit and subsequent demonstration of the technology at Southern Illinois Power Cooperative`s (SIPC`s) 33-MW unit 1 cyclone boiler located near Marion, Illinois. The LNS Burner employs a simple innovative combustion process burning high-sulfur Illinois coal to provide substantial SO{sub 2} and NO{sub x} control within the burner. A complete series of boiler performance and characterization tests, called the baseline tests, was conducted in October 1990 on unit 1 of SIPC`s Marion Station. The primary objective of the baseline test was to collect data from the existing plant that could provide a comparison of performance after the LNS Burner retrofit. These data could confirm the LNS Burner`s SO{sub x} and NO{sub x} emissions control and any effect on boiler operation. Further, these tests would provide to the project experience with the operating characteristics of the host unit as well as engineering design information to minimize technical uncertainties in the application of the LNS Burner technology.

  5. Low NO sub x /SO sub x Burner retrofit for utility cyclone boilers

    SciTech Connect (OSTI)

    Not Available

    1990-01-01

    The objective of this project is to demonstrate the LNS Burner as retrofitted to the host cyclone boiler for effective low-cost control of NO{sub x} and SO{sub x} emissions while firing a bituminous coal. The LNS Burner employs a simple, innovative combustion process to burn pulverized coal at high temperatures and provides effective, low-cost control of sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) emissions. The coal ash contains sulfur and is removed in the form of molten slag and flyash. Cyclone-fired boiler units are typically older units firing high-sulfur bituminous coals at very high temperatures which results in very high NO{sub x} and SO{sub x} emissions. The addition of conventional emission control equipment, such as wet scrubbers, to these older cyclone units in order to meet current and future environmental regulations is generally not economic. Further, the units are generally not compatible with low sulfur coal switching for S0{sub 2} control or selective catalytic reduction technologies for NO{sub x} control. Because the LNS Burner operates at the same very high temperatures as a typical cyclone boiler and produces a similar slag product, it may offer a viable retrofit option for cyclone boiler emission control. This was confirmed by the Cyclone Boiler Retrofit Feasibility Study carried out by TransAlta and an Operating Committee formed of cyclone boiler owners in 1989. An existing utility cyclone boiler, was then selected for the evaluation of the cost and performance study. It was concluded that the LNS Burner retrofit would be a cost-effective option for control of cyclone boiler emissions. A full-scale demonstration of the LNS Burner retrofit was selected in October 1988 as part of the DOE's Clean Coal Technology Program Round II.

  6. A CLASSIFICATION OF DUCT MODES BASED ON SURFACE WAVES Sjoerd W. Rienstra

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    A CLASSIFICATION OF DUCT MODES BASED ON SURFACE WAVES Sjoerd W. Rienstra Department of Mathematics For the relatively high frequencies relevant in a turbofan engine duct the modes of a lined sec- tion may be classified in two categories: genuine acoustic 3D duct modes resulting from the finiteness of the duct

  7. Efficient Computation of Spinning Modal Radiation Through an Engine Bypass Duct

    E-Print Network [OSTI]

    Huang, Xun

    Efficient Computation of Spinning Modal Radiation Through an Engine Bypass Duct Xun Huang, Xiaoxian out of a duct with flow. The sound propagation inside a generic engine bypass duct, refractions compared on a canonical case of sound propagation out of a semi-infinite duct with flow. Good agreements

  8. A CLASSIFICATION OF DUCT MODES BASED ON SURFACE WAVES Sjoerd W. Rienstra

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    A CLASSIFICATION OF DUCT MODES BASED ON SURFACE WAVES Sjoerd W. Rienstra Department of Mathematics For the relatively high frequencies relevant in a turbofan engine duct the modes of a lined sec­ tion may be classified in two categories: genuine acoustic 3D duct modes resulting from the finiteness of the duct

  9. STABILITY ANALYSIS FOR BUOYANCY-OPPOSED FLOWS IN POLOIDAL DUCTS OF THE DCLL BLANKET

    E-Print Network [OSTI]

    Abdou, Mohamed

    STABILITY ANALYSIS FOR BUOYANCY-OPPOSED FLOWS IN POLOIDAL DUCTS OF THE DCLL BLANKET N. Vetcha, S, the most of heat deposition and tritium breeding occur in the poloidal ducts facing the plasma (front ducts flows in the long poloidal ducts are comparable with or can even dominate over forced flows, thus

  10. Method and apparatus for duct sealing using a clog-resistant insertable injector

    DOE Patents [OSTI]

    Wang, Duo (Albany, CA); Modera, Mark P. (Piedmont, CA)

    2010-12-14

    A method for forming a duct access region through one side of a previously installed air duct, wherein the air duct has an air flow with an air flow direction by inserting an aerosol injector into a previously installed air duct through the access region. The aerosol injector includes a liquid tube having a liquid tube orifice for ejecting a liquid to be atomized; and a propellant cap. The method is accomplished by aligning the aerosol injector with the direction of air flow in the duct; activating an air flow within the duct; and spraying a sealant through the aerosol injector to seal the duct in the direction of the air flow.

  11. DOE Zero Energy Ready Home Webinar: Ducts in Conditioned Space

    Broader source: Energy.gov [DOE]

    DOE Challenge Home is a blueprint for zero energy ready homes.  When we make that statement – it’s impossible to justify huge thermal losses from ducts in unconditioned spaces.  That’s why one of...

  12. The Effects of Geometry on Flexible Duct CFD Simulations 

    E-Print Network [OSTI]

    Ugursal, A.; Culp, C.

    2008-01-01

    dynamics (CFD) simulations allow variable configurations and are emerging as an alternative to laboratory measurements. Issues with the CFD simulations of flexible ducts have been modeling the complex geometry and the computational requirements to complete...

  13. Ducting arrangement for cooling a gas turbine structure

    DOE Patents [OSTI]

    Lee, Ching-Pang; Morrison, Jay A.

    2015-07-21

    A ducting arrangement (10) for a can annular gas turbine engine, including: a duct (12, 14) disposed between a combustor (16) and a first row of turbine blades and defining a hot gas path (30) therein, the duct (12, 14) having raised geometric features (54) incorporated into an outer surface (80); and a flow sleeve (72) defining a cooling flow path (84) between an inner surface (78) of the flow sleeve (72) and the duct outer surface (80). After a cooling fluid (86) traverses a relatively upstream raised geometric feature (90), the inner surface (78) of the flow sleeve (72) is effective to direct the cooling fluid (86) toward a landing (94) separating the relatively upstream raised geometric feature (90) from a relatively downstream raised geometric feature (94).

  14. Measure Guideline: Buried and/or Encapsulated Ducts

    SciTech Connect (OSTI)

    Shapiro, C.; Zoeller, W.; Mantha, P.

    2013-08-01

    Buried and/or encapsulated ducts (BEDs) are a class of advanced, energy-efficiency strategies intended to address the significant ductwork thermal losses associated with ducts installed in unconditioned attics. BEDs are ducts installed in unconditioned attics that are covered in loose-fill insulation and/or encapsulated in closed cell polyurethane spray foam insulation. This Measure Guideline covers the technical aspects of BEDs as well as the advantages, disadvantages, and risks of BEDs compared to other alternative strategies. This guideline also provides detailed guidance on installation of BEDs strategies in new and existing homes through step-by-step installation procedures. Some of the procedures presented here, however, require specialized equipment or expertise. In addition, some alterations to duct systems may require a specialized license.

  15. Flow control optimization in a jet engine serpentine inlet duct 

    E-Print Network [OSTI]

    Kumar, Abhinav

    2009-05-15

    Computational investigations were carried out on an advanced serpentine jet engine inlet duct to understand the development and propagation of secondary flow structures. Computational analysis which went in tandem with experimental investigation...

  16. BETTER DUCT SYSTEMS FOR HOME HEATING AND COOLING.

    SciTech Connect (OSTI)

    ANDREWS,J.

    2001-01-01

    This is a series of six guides intended to provide a working knowledge of residential heating and cooling duct systems, an understanding of the major issues concerning efficiency, comfort, health, and safety, and practical tips on installation and repair of duct systems. These guides are intended for use by contractors, system designers, advanced technicians, and other HVAC professionals. The first two guides are also intended to be accessible to the general reader.

  17. Lymphoscintigraphic evaluation of the thoracic duct in the canine 

    E-Print Network [OSTI]

    Hodges, Carlos Cintron

    1990-01-01

    LYMPHOSCINTIGRAPHIC EVALUATION OF THE THORACIC DUCT IN THE CANINE A Thesis by CARLOS CINTRON HODGES Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1990 Major Subject: Veterinary Medicine and Surgery LYMPHOSCINTIGRAPHIC EVALUATION OF THE THORACIC DUCT IN THE CANINE A Thesis by CARLOS CINTRON HODGES Approved as to style and content by: H W. Boothe (Chair of Committee) D...

  18. DEVELOPMENT AND DEMONSTRATION OF NOVEL LOW-NOx BURNERS IN THE STEEL INDUSTRY

    SciTech Connect (OSTI)

    Cygan, David

    2006-12-28

    Gas Technology Institute (GTI), together with Hamworthy Peabody Combustion Incorporated (formerly Peabody Engineering Corporation), the University of Utah, and Far West Electrochemical have developed and demonstrated an innovative combustion system suitable for natural gas and coke-oven gas firing within the steel industry. The combustion system is a simple, low-cost, energy-efficient burner that can reduce NOx by more than 75%. The U.S. steel industry needs to address NOx control at its steelmaking facilities. A significant part of NOx emissions comes from gas-fired boilers. In steel plants, byproduct gases – blast furnace gas (BFG) and coke-oven gas (COG) – are widely used together with natural gas to fire furnaces and boilers. In steel plants, natural gas can be fired together with BFG and COG, but, typically, the addition of natural gas raises NOx emissions, which can already be high because of residual fuel-bound nitrogen in COG. The Project Team has applied its expertise in low-NOx burners to lower NOx levels for these applications by combining advanced burner geometry and combustion staging with control strategies tailored to mixtures of natural gas and byproduct fuel gases. These methods reduce all varieties of NOx – thermal NOx produced by high flame temperatures, prompt NOx produced by complex chain reactions involving radical hydrocarbon species and NOx from fuel-bound nitrogen compounds such as ammonia found in COG. The Project Team has expanded GTI’s highly successful low-NOx forced internal recirculation (FIR) burner, previously developed for natural gas-fired boilers, into facilities that utilize BFG and COG. For natural gas firing, these burners have been shown to reduce NOx emissions from typical uncontrolled levels of 80-100 vppm to single-digit levels (9 vppm). This is done without the energy efficiency penalties incurred by alternative NOx control methods, such as external flue gas recirculation (FGR), water injection, and selective non-catalytic reduction. The FIR burner was previously demonstrated on firetube and watertube boilers, and these units are still operating at several industrial and commercial boiler sites in sizes ranging from 2.5 to 60 million Btu/h. This report covers the development of an innovative combustion system suitable for natural gas or coke-oven gas firing within the steel industry. The prototype FIR burner was evaluated on a 20 million Btu/h watertube boiler. Acceptable burner performance was obtained when firing natural gas and simulated coke-oven gas doped with ammonia. The laboratory data reveals a direct relationship between NOx formation and the ammonia concentration in the fuel. In addition, NOx formation increases as the primary stoichiometric ratio (PSR) increases. Representative ammonia concentrations, as documented in the steel industry, ranged from 200 to 500 vppm. When the laboratory burner/boiler was operated with 500 vppm ammonia in the fuel, NOx emissions ranged from 50 to 75 vppm. This, conservatively, is 75% less than state-of-the-art burner performance. When the burner is operated with 200 vppm ammonia in the fuel, the corresponding NOx emissions would range from 30 to 45 vppm, 84% less than present burner technology. During field evaluation on a 174 million Btu/h industrial prototype burner both natural gas and actual COG from on-site generation were tested. Despite the elevated hydrogen cyanide and ammonia content in the COG throughout the test program, the FIR burner showed an improvement over baseline emissions. At full load; 167 million Btu/h, NOx emissions were relatively low at 169 vppm. This represents a 30% reduction compared to baseline emissions not accounting for the higher hydrogen cyanide content in the COG. CO emissions remained below 20 vppm and were stable across the firing range. This represents a 68% reduction compared to baseline CO emissions. When firing natural gas, emissions were stable as firing rate increased over the range. At low fire; 45 million Btu/h, NOx emissions where 33 vppm and increased at full load; 144 million Btu

  19. WAVE PROPAGATION in the HOT DUCT of VHTR

    SciTech Connect (OSTI)

    Richard Schultz; Jim C. P. Liou

    2013-07-01

    In VHTR, helium from the reactor vessel is conveyed to a power conversion unit through a hot duct. In a hypothesized Depressurized Conduction Cooldown event where a rupture of the hot duct occurs, pressure waves will be initiated and reverberate in the hot duct. A numerical model is developed to quantify the transients and the helium mass flux through the rupture for such events. The flow path of the helium forms a closed loop but only the hot duct is modeled in this study. The lower plum of the reactor vessel and the steam generator are treated as specified pressure and/or temperature boundary to the hot duct. The model is based on the conservation principles of mass, momentum and energy, and on the equations of state for helium. The numerical solution is based on the method of characteristics with specified time intervals with a predictor and corrector algorithm. The rupture sub-model gives reasonable results. Transients induced by ruptures with break area equaling 20%, 10%, and 5% of the duct cross-sectional area are described.

  20. Measure Guideline: Buried and/or Encapsulated Ducts

    SciTech Connect (OSTI)

    Shapiro, C.; Zoeller, W.; Mantha, P.

    2013-08-01

    Buried and/or encapsulated ducts (BEDs) are a class of advanced, energy-efficiency strategies intended to address the significant ductwork thermal losses associated with ducts installed in unconditioned attics. BEDs are ducts installed in unconditioned attics that are covered in loose-fill insulation and/or encapsulated in closed cell polyurethane spray foam insulation. This Measure Guideline covers the technical aspects of BEDs as well as the advantages, disadvantages, and risks of BEDs compared to other alternative strategies. This guideline also provides detailed guidance on installation of BEDs strategies in new and existing homes through step-by-step installation procedures. This Building America Measure Guideline synthesizes previously published research on BEDs and provides practical information to builders, contractors, homeowners, policy analysts, building professions, and building scientists. Some of the procedures presented here, however, require specialized equipment or expertise. In addition, some alterations to duct systems may require a specialized license. Persons implementing duct system improvements should not go beyond their expertise or qualifications. This guideline provides valuable information for a building industry that has struggled to address ductwork thermal losses in new and existing homes. As building codes strengthen requirements for duct air sealing and insulation, flexibility is needed to address energy efficiency goals. While ductwork in conditioned spaces has been promoted as the panacea for addressing ductwork thermal losses, BEDs installations approach - and sometimes exceed - the performance of ductwork in conditioned spaces.

  1. A Tool for the Spectral Analysis of the Laser Doppler Anemometer Data of the Cambridge Stratified Swirl Burner

    E-Print Network [OSTI]

    Zhou, Ruigang; Balusamy, Saravanan; Hochgreb, Simone

    2012-06-08

    A series of flow fields generated by a turbulent methane/air stratified swirl burner are investigated using laser Doppler anemometer (LDA). The LDA provides flow field measurements with comparatively high temporal resolutions. However, processing...

  2. Evaluation of Fluid Conduction and Mixing within a Subassembly of the Actinide Burner Test Reactor

    SciTech Connect (OSTI)

    Cliff B. Davis

    2007-09-01

    The RELAP5-3D code is being considered as a thermal-hydraulic system code to support the development of the sodium-cooled Actinide Burner Test Reactor as part of the Global Nuclear Energy Partnership. An evaluation was performed to determine whether the control system could be used to simulate the effects of non-convective mechanisms of heat transport in the fluid, including axial and radial heat conduction and subchannel mixing, that are not currently represented with internal code models. The evaluation also determined the relative importance of axial and radial heat conduction and fluid mixing on peak cladding temperature for a wide range of steady conditions and during a representative loss-of-flow transient. The evaluation was performed using a RELAP5-3D model of a subassembly in the Experimental Breeder Reactor-II, which was used as a surrogate for the Actinide Burner Test Reactor.

  3. Method for reducing NOx during combustion of coal in a burner

    DOE Patents [OSTI]

    Zhou, Bing (Cranbury, NJ); Parasher, Sukesh (Lawrenceville, NJ); Hare, Jeffrey J. (Provo, UT); Harding, N. Stanley (North Salt Lake, UT); Black, Stephanie E. (Sandy, UT); Johnson, Kenneth R. (Highland, UT)

    2008-04-15

    An organically complexed nanocatalyst composition is applied to or mixed with coal prior to or upon introducing the coal into a coal burner in order to catalyze the removal of coal nitrogen from the coal and its conversion into nitrogen gas prior to combustion of the coal. This process leads to reduced NOx production during coal combustion. The nanocatalyst compositions include a nanoparticle catalyst that is made using a dispersing agent that can bond with the catalyst atoms. The dispersing agent forms stable, dispersed, nano-sized catalyst particles. The catalyst composition can be formed as a stable suspension to facilitate storage, transportation and application of the catalyst nanoparticles to a coal material. The catalyst composition can be applied before or after pulverizing the coal material or it may be injected directly into the coal burner together with pulverized coal.

  4. Low NO sub x /SO sub x Burner retrofit for utility cyclone boilers

    SciTech Connect (OSTI)

    Not Available

    1991-09-01

    This Public Design Report provides available nonproprietary design information on the Low NO{sub x}SO{sub x} Burner Retrofit of Utility Cyclone Boilers project. In addition to the design aspects, the history of the project, the organization of the project, and the role of the funding parties are discussed. An overview of the Low NO{sub x}SO{sub x} (LNS) Burner, the cyclone boiler and the Southern Illinois Power Cooperative host site is presented. A detailed nonproprietary description of the individual process steps, plant systems, and resulting performance then follows. Narrative process descriptions, simplified process flow diagrams, input/output stream data, operating conditions and requirements are given for each unit. The plant demonstration program and start up provisions, the environmental considerations and control, monitoring and safety factors that are considered are also addressed.

  5. Pollutant Exposures from Natural Gas Cooking Burners: A Simulation-Based Assessment for Southern California

    SciTech Connect (OSTI)

    Logue, Jennifer M.; Klepeis, Neil E.; Lobscheid, Agnes B.; Singer, Brett C.

    2014-06-01

    Residential natural gas cooking burners (NGCBs) can emit substantial quantities of pollutants and they are typically used without venting. The objective of this study is to quantify pollutant concentrations and occupant exposures resulting from NGCB use in California homes. A mass balance model was applied to estimate time-dependent pollutant concentrations throughout homes and the "exposure concentrations" experienced by individual occupants. The model was applied to estimate nitrogen dioxide (NO{sub 2}), carbon monoxide (CO), and formaldehyde (HCHO) concentrations for one week each in summer and winter for a representative sample of Southern California homes. The model simulated pollutant emissions from NGCBs, NO{sub 2} and CO entry from outdoors, dilution throughout the home, and removal by ventilation and deposition. Residence characteristics and outdoor concentrations of CO and NO{sub 2} were obtained from available databases. Ventilation rates, occupancy patterns, and burner use were inferred from household characteristics. Proximity to the burner(s) and the benefits of using venting range hoods were also explored. Replicate model executions using independently generated sets of stochastic variable values yielded estimated pollutant concentration distributions with geometric means varying less than 10%. The simulation model estimates that in homes using NGCBs without coincident use of venting range hoods, 62%, 9%, and 53% of occupants are routinely exposed to NO{sub 2}, CO, and HCHO levels that exceed acute health-based standards and guidelines. NGCB use increased the sample median of the highest simulated 1-hr indoor concentrations by 100, 3000, and 20 ppb for NO{sub 2}, CO, and HCHO, respectively. Reducing pollutant exposures from NGCBs should be a public health priority. Simulation results suggest that regular use of even moderately effective venting range hoods would dramatically reduce the percentage of homes in which concentrations exceed health-based standards.

  6. Fiberglass Duct Cleaning Safe Work Practices Duct Cleaning -Prior to reaching a decision to clean a duct, an investigation of possible

    E-Print Network [OSTI]

    de Lijser, Peter

    ­ Locations should be noted prior to conducting work. Lockers, Showers, and Hand Wash Sinks ­ Should to be sure that there are no hazardous containing materials in the duct system such as Asbestos. Asbestos into particulate collection equipment. 3. All equipment located outside should be placed downwind and away from

  7. Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes

    SciTech Connect (OSTI)

    Beach, R.; Burdick, A.

    2014-03-01

    This measure guideline offers additional recommendations to heating, ventilation, and air conditioning (HVAC) system designers for optimizing flexible duct, constant-volume HVAC systems using junction boxes within Air Conditioning Contractors of America (ACCA) Manual D guidance (Rutkowski, H. Manual D -- Residential Duct Systems, 3rd edition, Version 1.00. Arlington, VA: Air Conditioning Contractors of America, 2009.). IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations (Beach, R., Prahl, D., and Lange, R. CFD Analysis of Flexible Duct Junction Box Design. Golden, CO: National Renewable Energy Laboratory, submitted for publication 2013). These recommendations can help to ensure that a system aligns more closely with the design and the occupants' comfort expectations. Specifically, the recommendations described herein show how to configure a rectangular box with four outlets, a triangular box with three outlets, metal wyes with two outlets, and multiple configurations for more than four outlets. Designers of HVAC systems, contractors who are fabricating junction boxes on site, and anyone using the ACCA Manual D process for sizing duct runs will find this measure guideline invaluable for more accurately minimizing pressure losses when using junction boxes with flexible ducts.

  8. Developing a market-based utility duct sealing program

    SciTech Connect (OSTI)

    Davis, B.; Baylon, D.; Houseknecht, A.

    1998-07-01

    In recent years, residential energy conservation research has focused attention on heating system distribution efficiency. Several field studies in the Pacific Northwest have found forced-air heating systems which have a majority of ducts located in unheated buffer spaces can lose as much as 30% of the equipment's heating output to duct air leakage and conduction loss. The magnitude of loss can be equivalent to the combined improvements in building shell insulation levels due to updated energy codes. Field review of forced-air heating systems often uncovers other problems with duct layout and equipment performance. Several challenges face utilities planning to undertake a large-scale duct-sealing program. Most notable of these challenges are finding suitable homes; working with field protocols which encourage consistent, successful work; and measuring the effects of the work through field quality control and impact analysis. This paper describes the response rate for duct sealing services based on one marketing approach and describes bill and field test screening criteria used to narrow the list of retrofit candidates. Results form the screening are presented, along with preliminary retrofit results and important operations and maintenance findings.

  9. Ducts in the Attic? What Were They Thinking? Preprint

    SciTech Connect (OSTI)

    Roberts, D.; Winkler, J.

    2010-08-01

    As energy-efficiency efforts focus increasingly on existing homes, we scratch our heads about construction decisions made 30, 40, 50-years ago and ask: 'What were they thinking?' A logical follow-on question is: 'What will folks think in 2050 about the homes we're building today?' This question can lead to a lively discussion, but the current practice that we find most alarming is placing ducts in the attic. In this paper, we explore through literature and analysis the impact duct location has on cooling load, peak demand, and energy cost in hot climates. For a typical new home in these climates, we estimate that locating ducts in attics rather than inside conditioned space increases the cooling load 0.5 to 1 ton, increases cooling costs 15% and increases demand by 0.75 kW. The aggregate demand to service duct loss in homes built in Houston, Las Vegas, and Phoenix during the period 2000 through 2009 is estimated to be 700 MW. We present options for building homes with ducts in conditioned space and demonstrate that these options compare favorably with other common approaches to achieving electricity peak demand and consumption savings in homes.

  10. Development of the Radiation Stabilized Distributed Flux Burner, Phase II Final Report

    SciTech Connect (OSTI)

    Webb, A.; Sullivan, J.D.

    1997-06-01

    This report covers progress made during Phase 2 of a three-phase DOE-sponsored project to develop and demonstrate the Radiation Stabilized Distributed Flux burner (also referred to as the Radiation Stabilized Burner, or RSB) for use in industrial watertube boilers and process heaters. The goal of the DOE-sponsored work is to demonstrate an industrial boiler burner with NOx emissions below 9 ppm and CO emissions below 50 ppm (corrected to 3% stack oxygen). To be commercially successful, these very low levels of NOx and CO must be achievable without significantly affecting other measures of burner performance such as reliability, turndown, and thermal efficiency. Phase 1 of the project demonstrated that sub-9 ppm NOx emissions and sub-50 ppm CO emissions (corrected to 3% oxygen) could be achieved with the RSB in a 3 million Btu/Hr laboratory boiler using several methods of NOx reduction. The RSB was also tested in a 60 million Btu/hr steam generator used by Chevron for Thermally Enhanced Oil Recovery (TEOR). In the larger scale tests, fuel staging was demonstrated, with the RSB consistently achieving sub-20 ppm NOx and as low as 10 ppm NOx. Large-scale steam generator tests also demonstrated that flue gas recirculation (FGR) provided a more predictable and reliable method of achieving sub-9 ppm NOx levels. Based on the results of tests at San Francisco Thermal and Chevron, the near-term approach selected by Alzeta for achieving low NOx is to use FGR. This decision was based on a number of factors, with the most important being that FGR has proved to be an easier approach to transfer to different facilities and boiler designs. In addition, staging has proved difficult to implement in a way that allows good combustion and emissions performance in a fully modulating system. In Phase 3 of the project, the RSB will be demonstrated as a very low emissions burner product suitable for continuous operation in a commercial installation. As such, the Phase 3 field demonstration will represent the first installation in which the RSB will be operated continuously with a sub-9 ppm guarantee.

  11. Particle deposition from turbulent flow: Review of published research and its applicability to ventilation ducts in commercial buildings

    E-Print Network [OSTI]

    Sippola, Mark R.; Nazaroff, William W.

    2002-01-01

    a 90° bend in a 15-cm square duct at a velocity of 5 m/s.M. and Wang, D. (1999) Duct systems in large commercialin ventilation air supply ducts. Proceedings of Indoor Air ‘

  12. Porokeratotic eccrine ostial and dermal duct nevus treated with a combination erbium/CO laser: A case and brief review

    E-Print Network [OSTI]

    Wong, Jillian W; Summers, Erika M; Taylor, Mark B; Harris, Ronald M

    2011-01-01

    of the palm — a sweat duct naevus? Br J Dermatol 1979; 101:eccrine ostial and dermal duct naevus. Br J Dermatol 1980;eccrine ostial and dermal duct nevus. Pediatric Dermatology

  13. Duct Leakage Modeling in EnergyPlus and Analysis of Energy Savings from Implementing SAV with InCITeTM

    E-Print Network [OSTI]

    Wray, Craig

    2010-01-01

    C. 2005. “Detecting Critical Supply Duct Pressure”. ASHRAEnl18/nl_18.html Wray, C.P. 2003. “Duct Thermal Performance12  Figure 10.  Duct Layout for Intervention Floor (control 

  14. Effects of a new cystic fibrosis transmembrane conductance regulator inhibitor on Cl- conductance in human sweat ducts

    E-Print Network [OSTI]

    Wang, X F; Reddy, M M; Quinton, Paul M

    2004-01-01

    conductance in human sweat ducts X. F. Wang 1 , M. M. Reddyand cystic ?brosis sweat ducts. P?ugers Arch 408, 505–510.secretion in the human sweat duct. Ann N Y Acad Sci 574,

  15. Advanced Strategy Guideline: Air Distribution Basics and Duct Design

    SciTech Connect (OSTI)

    Burdick, A.

    2011-12-01

    This report discusses considerations for designing an air distribution system for an energy efficient house that requires less air volume to condition the space. Considering the HVAC system early in the design process will allow adequate space for equipment and ductwork and can result in cost savings. Principles discussed that will maximize occupant comfort include delivery of the proper amount of conditioned air for appropriate temperature mixing and uniformity without drafts, minimization of system noise, the impacts of pressure loss, efficient return air duct design, and supply air outlet placement, as well as duct layout, materials, and sizing.

  16. Fundamental investigation of duct/ESP phenomena. Final report

    SciTech Connect (OSTI)

    Brown, C.A. [Radian Corp., Austin, TX (United States); Durham, M.D. [ADA Technologies, Inc., Englewood, CO (United States); Sowa, W.A. [California Univ., Irvine, CA (United States). Combustion Lab.; Himes, R.M. [Fossil Energy Research Corp., Laguna Hills, CA (United States); Mahaffey, W.A. [CHAM of North America, Inc., Huntsville, AL (United States)

    1991-10-21

    Radian Corporation was contracted to investigate duct injection and ESP phenomena in a 1.7 MW pilot plant constructed for this test program. This study was an attempt to resolve problems found in previous studies and answer remaining questions for the technology using an approach which concentrates on the fundamental mechanisms of the process. The goal of the study was to obtain a better understanding of the basic physical and chemical phenomena that control: (1) the desulfurization of flue gas by calcium-based reagent, and (2) the coupling of an existing ESP particulate collection device to the duct injection process. Process economics are being studied by others. (VC)

  17. Particle Concentration Dynamics in the Ventilation Duct after an Artificial Release: for Countering Potential Bioterriorist Attack

    E-Print Network [OSTI]

    You , Siming; Wan, Man Pun

    2014-01-01

    leads to In this work, the models of particle concentration dynamics in the ventilation duct following a resuspension

  18. Naturalness Under Stress: SUSY after 5 fb-1 West Coast LHC Meeting, December, 2011

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    Naturalness Under Stress: SUSY after 5 fb-1 West Coast LHC Meeting, December, 2011 Michael Dine of us in some productive, new directions. Some of the arguments will be bottom up, some top down scale in the TeV MZ energy range. Possibly within two weeks and almost certainly within a year, we

  19. Statistical maritime radar duct estimation using hybrid genetic algorithmMarkov

    E-Print Network [OSTI]

    Gerstoft, Peter

    Statistical maritime radar duct estimation using hybrid genetic algorithm­Markov chain Monte Carlo encountered in low- altitude maritime radar applications. This is done by statistically estimating the duct of unknowns. Citation: Yardim, C., P. Gerstoft, and W. S. Hodgkiss (2007), Statistical maritime radar duct

  20. Modal Scattering at an Impedance Transition in a Lined Flow Duct

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    Modal Scattering at an Impedance Transition in a Lined Flow Duct Sjoerd W. Rienstra Eindhoven CB3 0WA, UK. An explicit Wiener-Hopf solution is derived to describe the scattering of duct modes at a hard-soft wall impedance transition in a circular duct with uniform mean flow. Specifically, we have

  1. Seamless Handover in Buildings Using HVAC Ducts: A New System Architecture

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Seamless Handover in Buildings Using HVAC Ducts: A New System Architecture Ariton E. Xhafa, Paisarn ducts for wireless communications. The proposed solution is based on a new system architecture design of the indoor wireless networks that use the heating, ventilation, and air conditioning (HVAC) ducts

  2. Modeling, Control, and Flight Testing of a Small Ducted Fan Aircraft

    E-Print Network [OSTI]

    Johnson, Eric N.

    1 Modeling, Control, and Flight Testing of a Small Ducted Fan Aircraft Eric N. Johnson* and Michael A. Turbe Georgia Institute of Technology, Atlanta, GA, 30332 Small ducted fan autonomous vehicles for the GTSpy, a small ducted fan autonomous vehicle based on the Micro Autonomous Systems' Helispy

  3. On the solution to the Riemann problem for the compressible duct ow

    E-Print Network [OSTI]

    On the solution to the Riemann problem for the compressible duct ow Nikolai Andrianov and Gerald Warnecke #3; March 6, 2003 Abstract The quasi-one-dimensional Euler equations in a duct of variable cross of the Euler equations in a duct of corresponding geometry and compare it with the 1D results. Then

  4. ORNL/LTR-2014/283 A Comparison of Simulation Capabilities for Ducts

    E-Print Network [OSTI]

    Wang, Xiaorui "Ray"

    ORNL/LTR-2014/283 A Comparison of Simulation Capabilities for Ducts William A. Miller Som Shrestha and Transportation Sciences Division A Comparison of Simulation Capabilities for Ducts William A. Miller Som Shrestha...........................................................9 3 DUCTS PLACED IN UNCONDITIONED ZONES

  5. TEMPERATURE CONTROLLABILITY IN CROSS-FLOW HEAT EXCHANGERS AND LONG DUCTS

    E-Print Network [OSTI]

    Sen, Mihir

    TEMPERATURE CONTROLLABILITY IN CROSS-FLOW HEAT EXCHANGERS AND LONG DUCTS A Dissertation Submitted-FLOW HEAT EXCHANGERS AND LONG DUCTS Abstract by Sorour Abdulhadi Alotaibi The performance of thermal control and long ducts, are investigated, and the following issues are addressed. (a) The first is controllability

  6. Static Pressure Losses in 6, 8, and 10-inch Non-Metallic Flexible Ducts 

    E-Print Network [OSTI]

    Weaver, K.; Culp, C.

    2006-01-01

    This study measured airflow static pressure losses through non-metallic flexible ducts in compliance with ASHRAE Standard 120-1999, Methods of Testing to Determine Flow Resistance of HVAC Air Ducts and Fittings (ASHRAE 1999). Duct sizes of 6, 8...

  7. Experimental Demonstration of 2x2 MIMO Communications in a Reverberant Ventilation Duct

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Experimental Demonstration of 2x2 MIMO Communications in a Reverberant Ventilation Duct Environment- tilation duct. We further demonstrate that MIMO coefficients applied to transmit and receive antennas can that ventilation ducts are an attractive media for distributing RF communication signals indoors (See for example

  8. Theoretical Study and Numerical Validation of Sound Radiation from Coaxial Annular Duct

    E-Print Network [OSTI]

    Huang, Xun

    Theoretical Study and Numerical Validation of Sound Radiation from Coaxial Annular Duct Xin Liu-infinite annular duct. Our problem is different from previous works in that both its inner pipe and outer pipe are semi-infinite. Hence, this problem is a better representative of aircraft engine bypass duct

  9. RF propagation in an HVAC duct system: impulse response characteristics of the channel

    E-Print Network [OSTI]

    Stancil, Daniel D.

    RF propagation in an HVAC duct system: impulse response characteristics of the channel Pavel V, the heating, ventilation, and air conditioning (HVAC) duct system in buildings is a complex network of hollow at RF and microwave frequencies of com- mon interest. HVAC ducts can be used as a wireless communication

  10. EXACT RIEMANN SOLUTIONS TO COMPRESSIBLE EULER EQUATIONS IN DUCTS WITH DISCONTINUOUS CROSSSECTION

    E-Print Network [OSTI]

    EXACT RIEMANN SOLUTIONS TO COMPRESSIBLE EULER EQUATIONS IN DUCTS WITH DISCONTINUOUS CROSS solutions for the system of Euler equa- tions in a duct with discontinuous varying cross through a duct of variable cross­section with the area a(x). They are given in the perturbation form U

  11. Characterization of the Conus bullatus genome and its venom-duct transcriptome

    E-Print Network [OSTI]

    Yandell, Mark

    Characterization of the Conus bullatus genome and its venom-duct transcriptome Hu et al. Hu et al ARTICLE Open Access Characterization of the Conus bullatus genome and its venom-duct transcriptome Hao Hu1 bullatus genome and venom-duct transcriptome. We find that conopeptides are highly expressed within

  12. Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant M. P. Modera, O. Brzozowski**

    E-Print Network [OSTI]

    LBNL-42414 1 Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Particles M. P Abstract Electricity energy savings potential by eliminating air leakage from ducts in large commercial buildings, a new technology that simultaneously seals duct leaks and measures effective leakage area

  13. Multi-carrier Signal Transmission through HVAC Ducts: Experimental Results for Channel Capacity

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Multi-carrier Signal Transmission through HVAC Ducts: Experimental Results for Channel Capacity) ducts based on multi-carrier transmission technique and mea- sured channel frequency responses in the 2 through a building HVAC duct system demonstrate the ability to transmit with a spectral efficiency of 3

  14. AIAA 2008-2877 Sound Radiation from a Generic Bypass Duct with

    E-Print Network [OSTI]

    Huang, Xun

    1 AIAA 2008-2877 Sound Radiation from a Generic Bypass Duct with Bifurcations Xiaoxian Chen1 , Xun, United Kingdom The influence of bifurcations in an aero-engine bypass duct on noise radiation of the simulations were compared with those of a clean duct case. A circumferential mode of m=12 with radial mode

  15. Control of Flow Separation in S-ducts via Flow Injection and Suction

    E-Print Network [OSTI]

    Debiasi, Marco

    Control of Flow Separation in S-ducts via Flow Injection and Suction Marco Debiasi1 , Marco Robert as a mean to control the separation of flow in S-duct inlets. The overall goal is to reduce the distortion of the S-duct outlet flow and to improve its pressure recovery by using the least expenditure of energy. We

  16. Cut-on, cut-off transition of sound in slowly varying flow ducts

    E-Print Network [OSTI]

    Rienstra, Sjoerd W.

    Cut-on, cut-off transition of sound in slowly varying flow ducts Sjoerd W. Rienstra 19-walled duct with irrotational isentropic mean flow is studied. The usual turning point behaviour was found. 1 Introduction The exact multiple scale solution for sound propagation in a slowly varying lined flow duct

  17. LBNL# 40102 Field Investigation of Duct System Performance in California Light Commercial Buildings 1 of 26

    E-Print Network [OSTI]

    LBNL# 40102 Field Investigation of Duct System Performance in California Light Commercial Buildings 1 of 26 Field Investigation of Duct System Performance in California Light Commercial Buildings Wm National Laboratory Berkeley, California Synopsis This paper discusses field measurements of duct system

  18. SOUND TRANSMISSION IN SLOWLY VARYING CIRCULAR AND ANNULAR LINED DUCTS WITH FLOW a

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    SOUND TRANSMISSION IN SLOWLY VARYING CIRCULAR AND ANNULAR LINED DUCTS WITH FLOW a S.W. Rienstra/CEAS Aeroacoustics Conference, June 2­4, 1998, Toulouse ABSTRACT Sound transmission through straight circular ducts by a modal expansion. A natural ex­ tension for ducts with axially slowly varying properties (diameter

  19. Interior Duct Wall Pressure Downstream of a Low-Speed Scott C. Morris

    E-Print Network [OSTI]

    Alonso, Juan J.

    Interior Duct Wall Pressure Downstream of a Low-Speed Rotor Scott C. Morris , David B. Stephens The region downstream of a ducted rotor has been experimentally investigated in terms of its wake characteristics and the duct wall pressure fluctuations. The motivation for the measurements was to document

  20. Toward a Better Understanding of Ducted Rotor Antitorque and Directional Control in Forward Flight

    E-Print Network [OSTI]

    Toward a Better Understanding of Ducted Rotor Antitorque and Directional Control in Forward Flight of ducted rotors in low-power, near-edgewise flow conditions are not well understood. Motivated by phenomena was initiated to use CFD to improve the understanding of the dynamic relationship between ducted rotor thrust

  1. Performance Analysis of Dual-Fan, Dual-Duct Constant Volume Air-Handling Units 

    E-Print Network [OSTI]

    Joo, I. S.; Liu, M.

    2001-01-01

    Dual-fan, dual-duct air-handling units introduce outside air directly into the cooling duct and use two variable speed devices to independently maintain the static pressure of the hot and the cold air ducts. Analytical models have been developed...

  2. Duct Leakage Impacts on Airtightness, Infiltration, and Peak Electrical Demand in Florida Homes 

    E-Print Network [OSTI]

    Cummings, J. B.; Tooley, J. J.; Moyer, N.

    1990-01-01

    (ACHSO). When the duct registers were sealed, ACHSO decreased to 11.04, indicating that 12.2% of the house leaks were in the duct system. Duct leaks have a dramatic impact upon peak electrical demand. Based on theoretical analysis, a fifteen percent...

  3. Cooling air recycling for gas turbine transition duct end frame and related method

    DOE Patents [OSTI]

    Cromer, Robert Harold (Johnstown, NY); Bechtel, William Theodore (Scotia, NY); Sutcu, Maz (Niskayuna, NY)

    2002-01-01

    A method of cooling a transition duct end frame in a gas turbine includes the steps of a) directing cooling air into the end frame from a region external of the transition duct and the impingement cooling sleeve; and b) redirecting the cooling air from the end frame into the annulus between the transition duct and the impingement cooling sleeve.

  4. 44 Market St - Refurbishment of a Dual Duct Building 

    E-Print Network [OSTI]

    Bannister, P.; Foo, G.

    2013-01-01

    44 Market St is a high profile, A-grade, 27-storey, 28,000m2 office building constructed in the 1970s. In common with many other buildings of its era, it was equipped with a dual duct air-conditioning system, and its highest NABERS Rating at full...

  5. Handover Performance of HVAC Duct Based Indoor Wireless Networks

    E-Print Network [OSTI]

    Stancil, Daniel D.

    in indoor wireless net- works (IWN) that use heating, ventilation, and air conditioning (HVAC) ducts point to serve one floor and its staircase region achieves the best handover performance for IWN]. An alternative approach to transmitt/receive the RF signal is to use heating, ventilation, and airconditioning

  6. Hot repair of ceramic burner on hot blast stoves at USS/Kobe`s {number_sign}3 blast furnace

    SciTech Connect (OSTI)

    Bernarding, T.F.; Chemorov, M.; Shimono, S.; Phillips, G.R.

    1997-12-31

    During the 1992 reline of the No. 3 blast furnace, three new stoves were constructed. The design of the stoves, equipped with internal ceramic burners, was for providing a hot blast temperature of 2,000 F at a wind rate of 140,000 SCFM. After 3 years the performance had deteriorated so the burners were cleaned. When a second cleaning did not improve the performance of No. 3 blast furnace, it was decided to repair the refractory while still hot. The paper describes the hot repair procedures, taking a stove off for repairs, maintenance heat up during repairs, two stove operation, stove commissioning, repair of a ceramic burner, and wet gas prevention.

  7. Experiments measuring particle deposition from fully developed turbulent flow in ventilation ducts

    SciTech Connect (OSTI)

    Sippola, Mark R.; Nazaroff, William W.

    2003-08-01

    Particle deposition in ventilation ducts influences particle exposures of building occupants and may lead to a variety of indoor air quality concerns. Experiments have been performed in a laboratory to study the effects of particle size and air speed on deposition rates of particles from turbulent air flows in galvanized steel and internally insulated ducts with hydraulic diameters of 15.2 cm. The duct systems were constructed of materials typically found in commercial heating, ventilating and air conditioning (HVAC) systems. In the steel duct system, experiments with nominal particle sizes of 1, 3, 5, 9 and 16 {micro}m were conducted at each of three nominal air speeds: 2.2, 5.3 and 9.0 m/s. In the insulated duct system, deposition rates of particles with nominal sizes of 1, 3, 5, 8 and 13 {micro}m were measured at nominal air speeds of 2.2, 5.3 and 8.8 m/s. Fluorescent techniques were used to directly measure the deposition velocities of monodisperse fluorescent particles to duct surfaces (floor, wall and ceiling) at two straight duct sections where the turbulent flow profile was fully developed. In steel ducts, deposition rates were higher to the duct floor than to the wall, which were, in turn, greater than to the ceiling. In insulated ducts, deposition was nearly the same to the duct floor, wall and ceiling for a given particle size and air speed. Deposition to duct walls and ceilings was greatly enhanced in insulated ducts compared to steel ducts. Deposition velocities to each of the three duct surface orientations in both systems were found to increase with increasing particle size or air velocity over the ranges studied. Deposition rates measured in the current experiments were in general agreement with the limited observations of similar systems by previous researchers.

  8. Combustion characteristics and NOx emissions of two kinds of swirl burners in a 300-MWe wall-fired pulverized-coal utility boiler

    SciTech Connect (OSTI)

    Li, Z.Q.; Jing, J.P.; Chen, Z.C.; Ren, F.; Xu, B.; Wei, H.D.; Ge, Z.H.

    2008-07-01

    Measurements were performed in a 300-MWe wall-fired pulverized-coal utility boiler. Enhanced ignition-dual register (EI-DR) burners and centrally fuel rich (CFR) swirl coal combustion burners were installed in the bottom row of the furnace during experiments. Local mean concentrations of O{sub 2}, CO, CO{sub 2} and NOx gas species, gas temperatures, and char burnout were determined in the region of the two types of burners. For centrally fuel rich swirl coal combustion burners, local mean CO concentrations, gas temperatures and the temperature gradient are higher and mean concentrations of O{sub 2} and NOx along the jet flow direction in the burner region are lower than for the enhanced ignition-dual register burners. Moreover, the mean O{sub 2} concentration is higher and the gas temperature and mean CO concentration are lower in the side wall region. For centrally fuel rich swirl coal combustion burners in the bottom row, the combustion efficiency of the boiler increases from 96.73% to 97.09%, and NOx emission decreases from 411.5 to 355 ppm at 6% O{sub 2} compared to enhanced ignition-dual register burners and the boiler operates stably at 110 MWe without auxiliary fuel oil.

  9. A Review of Thermal Acoustical and Special Project Requirements Data in Designing a Duct System 

    E-Print Network [OSTI]

    Lebens, A. F.

    1986-01-01

    or duct wrap because of their low resistance to punctures. As we all know, it would be impossible to clean out a lined sheet metal duct or fiberglass duct. Specifications on a remodel project should include flexibility for jobsite redesign without...). Lined sheet metal (1" 2.0 pcf density) had a U of .23; wrapped sheet metal (2" .75 pcf density) at 25 percent compression had a U of .16; fiberglass duct 1" thick was .19 U-value; and insulated flexible duct 1" thick had a .18 U-value. This data...

  10. Development of a full-flow burner regeneration type diesel particulate filter using SiC honeycomb

    SciTech Connect (OSTI)

    Okazoe, Hiroshi; Shimizu, Kenji; Watanabe, Yoshito; Santiago, E.; Kugland, P.; Ruth, W.

    1996-09-01

    A diesel particulate filter (DPF) for city buses was developed that combines a SiC filter and a full-now type burner for regeneration. Filter crack problems were averted by suppressing the peak temperature inside the filter to under 900 C. This was done by setting the maximum tolerable amount of collected particulate mass before regeneration at 50 g and controlling the burner so as to increase the regeneration gas temperature slowly up to a set value. This DPF was retrofitted to a Tokyo metropolitan bus to conduct a field test. The field test has been under way for half a year without any trouble or deterioration of system performance.

  11. Modeling Population Exposures to Pollutants Emitted from Natural Gas Cooking Burners

    SciTech Connect (OSTI)

    Lobscheid, Agnes; Singer, Brett C.; Klepeis, Neil E.

    2011-06-01

    We developed a physics-based data-supported model to investigate indoor pollutant exposure distributions resulting from use of natural gas cooking appliances across households in California. The model was applied to calculate time-resolved indoor concentrations of CO, NO2 and formaldehyde resulting from cooking burners and entry with outdoor air. Exposure metrics include 1-week average concentrations and frequency of exceeding ambient air quality standards. We present model results for Southern California (SoCal) using two air-exchange scenarios in winter: (1) infiltration-only, and (2) air exchange rate (AER) sampled from lognormal distributions derived from measurements. In roughly 40percent of homes in the SoCal cohort (N=6634) the 1-hour USEPA NO2 standard (190 ?g/m3) was exceeded at least once. The frequency of exceeding this standard was largely independent of AER assumption, and related primarily to building volume, emission rate and amount of burner use. As expected, AER had a more substantial impact on one-week average concentrations.

  12. Multi-ported, internally recuperated burners for direct flame impingement heating applications

    DOE Patents [OSTI]

    Abbasi, Hamid A. (Naperville, IL); Kurek, Harry (Dyer, IN); Chudnovsky, Yaroslav (Skokie, IL); Lisienko, Vladimir G. (Ekaterinburg, RU); Malikov, German K. (Ekaterinburg, RU)

    2010-08-03

    A direct flame impingement method and apparatus employing at least one multi-ported, internally recuperated burner. The burner includes an innermost coaxial conduit having a first fluid inlet end and a first fluid outlet end, an outermost coaxial conduit disposed around the innermost coaxial conduit and having a combustion products outlet end proximate the first fluid inlet end of the innermost coaxial conduit and a combustion products inlet end proximate the first fluid outlet end of the innermost coaxial conduit, and a coaxial intermediate conduit disposed between the innermost coaxial conduit and the outermost coaxial conduit, whereby a second fluid annular region is formed between the innermost coaxial conduit and the intermediate coaxial conduit and a combustion products annular region is formed between the intermediate coaxial conduit and the outermost coaxial conduit. The intermediate coaxial conduit has a second fluid inlet end proximate the first fluid inlet end of the innermost coaxial conduit and a second fluid outlet end proximate the combustion products inlet end of the outermost coaxial conduit.

  13. Swozzle based burner tube premixer including inlet air conditioner for low emissions combustion

    DOE Patents [OSTI]

    Tuthill, Richard Sterling (Bolton, CT); Bechtel, II, William Theodore (Scotia, NY); Benoit, Jeffrey Arthur (Scotia, NY); Black, Stephen Hugh (Duanesburg, NY); Bland, Robert James (Clifton Park, NY); DeLeonardo, Guy Wayne (Scotia, NY); Meyer, Stefan Martin (Troy, NY); Taura, Joseph Charles (Clifton Park, NY); Battaglioli, John Luigi (Glenville, NY)

    2002-01-01

    A burner for use in a combustion system of a heavy-duty industrial gas turbine includes a fuel/air premixer having an air inlet, a fuel inlet, and an annular mixing passage. The fuel/air premixer mixes fuel and air into a uniform mixture for injection into a combustor reaction zone. The burner also includes an inlet flow conditioner disposed at the air inlet of the fuel/air premixer for controlling a radial and circumferential distribution of incoming air. The pattern of perforations in the inlet flow conditioner is designed such that a uniform air flow distribution is produced at the swirler inlet annulus in both the radial and circumference directions. The premixer includes a swozzle assembly having a series of preferably air foil shaped turning vanes that impart swirl to the airflow entering via the inlet flow conditioner. Each air foil contains internal fuel flow passages that introduce natural gas fuel into the air stream via fuel metering holes that pass through the walls of the air foil shaped turning vanes. By injecting fuel in this manner, an aerodynamically clean flow field is maintained throughout the premixer. By injecting fuel via two separate passages, the fuel/air mixture strength distribution can be controlled in the radial direction to obtain optimum radial concentration profiles for control of emissions, lean blow outs, and combustion driven dynamic pressure activity as machine and combustor load are varied.

  14. Investigation on Flame Characteristics and Burner Operability Issues of Oxy-Fuel Combustion

    SciTech Connect (OSTI)

    Choudhuri, Ahsan

    2013-05-30

    Oxy-fuel combustion has been used previously in a wide range of industrial applications. Oxy- combustion is carried out by burning a hydrocarbon fuel with oxygen instead of air. Flames burning in this configuration achieve higher flame temperatures which present opportunities for significant efficiency improvements and direct capture of CO{sub 2} from the exhaust stream. In an effort to better understand and characterize the fundamental flame characteristics of oxy-fuel combustion this research presents the experimental measurements of flame stability of various oxyfuel flames. Effects of H{sub 2} concentration, fuel composition, exhaust gas recirculation ratio, firing inputs, and burner diameters on the flame stability of these fuels are discussed. Effects of exhaust gas recirculation i.e. CO{sub 2} and H{sub 2}O (steam) acting as diluents on burner operability are also presented. The roles of firing input on flame stability are then analyzed. For this study it was observed that many oxy-flames did not stabilize without exhaust gas recirculation due to their higher burning velocities. In addition, the stability regime of all compositions was observed to decrease as the burner diameter increased. A flashback model is also presented, using the critical velocity gradient g{sub F}) values for CH{sub 4}-O{sub 2}-CO{sub 2} flames. The scaling relation (𝐠{sub F} = 𝐜 𝐒{sub 𝐋}{sup 2}/𝛂) for different burner diameters was obtained for various diameter burners. The report shows that results correlated linearly with a scaling value of c =0.0174. The second part of the study focuses on the experimental measurements of the flow field characteristics of premixed CH{sub 4}/21%O{sub 2}/79%N{sub 2} and CH{sub 4}/38%O{sub 2}/72%CO{sub 2} mixtures at constant firing input of 7.5 kW, constant, equivalence ratio of 0.8, constant swirl number of 0.92 and constant Reynolds Numbers. These measurements were taken in a swirl stabilized combustor at atmospheric pressure. The flow field visualization using Particle Imaging Velocimetry (PIV) technique is implemented to make a better understanding of the turbulence characteristics of CH{sub 4}/air and CH{sub 4}/38%O{sub 2}/72%CO{sub 2} combustion. The velocity fluctuations, turbulence intensities and local propagation velocities along the combustion chamber have been determined. The turbulent intensities increase as we move away from the combustor axis. CH{sub 4}-38%O{sub 2}-72%CO{sub 2} flames have low radial velocity and turbulent intensity distributions at different axial distances when compared with CH{sub 4}-Air flames.

  15. VOL. 28, NO. 8, AUGUST 1990 AIAA JOURNAL 1447 Flow Distortion in a Circular-to-Rectangular Transition Duct

    E-Print Network [OSTI]

    Leu, Tzong-Shyng "Jeremy"

    -to-Rectangular Transition Duct J. J. Miau,* T. S. Leu,? J. H. Chou,f S. A. Lint National Cheng Kung University, Tainan, Taiwan, Republic of China Experiments were made for three circular-to-rectangular transition ducts of the transition duct. The results indicate that the major driving force for flow in the duct to behave three

  16. Decay constants $f_B$ and $f_{B_s}$ from HISQ simulations

    E-Print Network [OSTI]

    Fermilab Lattice; MILC Collaborations; :; A. Bazavov; C. Bernard; C. Bouchard; N. Brown; C. DeTar; D. Du; A. X. El-Khadra; E. D. Freeland; E. Gįmiz; Steven Gottlieb; U. M. Heller; J. Komijani; A. S. Kronfeld; J. Laiho; L. Levkova; P. B. Mackenzie; C. Monahan; T. Primer; Heechang Na; E. T. Neil; J. N. Simone; R. L. Sugar; D. Toussaint; R. S. Van de Water; R. Zhou

    2015-11-07

    We give a progress report on a project aimed at a high-precision calculation of the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy valence-quark masses on ensembles with 2+1+1 flavors of HISQ sea quarks at five lattice spacings and several light sea-quark mass ratios $m_{ud}/m_s$, including approximately physical sea-quark masses. This range of parameters provides excellent control of the continuum limit and of heavy-quark discretization errors. We present a preliminary error budget with projected uncertainties of 2.2~MeV and 1.5~MeV for $f_B$ and $f_{B_s}$, respectively.

  17. Decay constants $f_B$ and $f_{B_s}$ from HISQ simulations

    E-Print Network [OSTI]

    Lattice, Fermilab; Bazavov, A; Bernard, C; Bouchard, C; Brown, N; DeTar, C; Du, D; El-Khadra, A X; Freeland, E D; Gįmiz, E; Gottlieb, Steven; Heller, U M; Komijani, J; Kronfeld, A S; Laiho, J; Levkova, L; Mackenzie, P B; Monahan, C; Primer, T; Na, Heechang; Neil, E T; Simone, J N; Sugar, R L; Toussaint, D; Van de Water, R S; Zhou, R

    2015-01-01

    We give a progress report on a project aimed at a high-precision calculation of the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy valence-quark masses on ensembles with 2+1+1 flavors of HISQ sea quarks at five lattice spacings and several light sea-quark mass ratios $m_{ud}/m_s$, including approximately physical sea-quark masses. This range of parameters provides excellent control of the continuum limit and of heavy-quark discretization errors. We present a preliminary error budget with projected uncertainties of 2.2~MeV and 1.5~MeV for $f_B$ and $f_{B_s}$, respectively.

  18. Ducts in Conditioned Space - Building America Top Innovation | Department

    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:FinancingPetroleum Based| Department8,Department of2 FederalEnergyDucts Sealing Using

  19. Pollutant exposures from unvented gas cooking burners: A Simulation-based Assessment for Southern California

    SciTech Connect (OSTI)

    Logue, Jennifer M.; Klepeis, Neil E.; Lobscheid, Agnes B.; Singer, Brett C.

    2014-01-01

    Residential natural gas cooking burners (NGCBs) can emit substantial quantities of pollutants, and they are typically used without venting range hoods. In this study, LBNL researchers quantified pollutant concentrations and occupant exposures resulting from NGCB use in California homes.The simulation model estimated that—in homes using NGCBs without coincident use of venting range hoods -- 62%, 9%, and 53% of occupants are routinely exposed to NO2, CO, and HCHO levels that exceed acute health-based standards and guidelines. NGCB use increased the sample median of the highest simulated 1-hr indoor concentrations by 100, 3,000, and 20 ppb for NO2, CO, and HCHO, respectively. The study recommends that reducing pollutant exposures from NGCBs should be a public health priority. Simulation results suggest that regular use of even moderately effective venting range hoods would dramatically reduce the percentage of homes in which concentrations exceed health-based standards.

  20. Multifractal detrended fluctuation analysis of combustion flames in four-burner impinging entrained-flow gasifier

    E-Print Network [OSTI]

    Niu, Miao-Ren; Yan, Zhuo-Yong; Guo, Qing-Hua; Liang, Qin-Feng; Wang, Fu-Chen; Yu, Zun-Hong

    2007-01-01

    On a laboratory-scale testing platform of impinging entrained-flow gasifier with four opposed burners, the flame images for diesel combustion and gasification process were measured with a single charge coupled device (CCD) camera. The two-dimensional multifractal detrended fluctuation analysis was employed to investigate the multifractal nature of the flame images. Sound power-law scaling in the annealed average of detrended fluctuations was unveiled when the order $q>0$ and the multifractal feature of flame images were confirmed. Further analyses identified two multifractal parameters, the minimum and maximum singularity $\\alpha_{\\min}$ and $\\alpha_{\\max}$, serving as characteristic parameters of the multifractal flames. These two characteristic multifractal parameters vary with respect to different experimental conditions.

  1. Mechanical swirler for a low-NO.sub.x, weak-swirl burner

    DOE Patents [OSTI]

    Cheng, Robert K. (Kensington, CA); Yegian, Derek T. (Berkeley, CA)

    1999-01-01

    Disclosed is a mechanical swirler for generating diverging flow in lean premixed fuel burners. The swirler of the present invention includes a central passage with an entrance for accepting a feed gas, a flow balancing insert that introduces additional pressure drop beyond that occurring in the central passage in the absence of the flow balancing insert, and an exit aligned to direct the feed gas into a combustor. The swirler also has an annular passage about the central passage and including one or more vanes oriented to impart angular momentum to feed gas exiting the annular passage. The diverging flow generated by the swirler stabilizes lean combustion thus allowing for lower production of pollutants, particularly oxides of nitrogen.

  2. Assessment of Startup Fuel Options for the GNEP Advanced Burner Reactor (ABR)

    SciTech Connect (OSTI)

    Jon Carmack; Kemal O. Pasamehmetoglu; David Alberstein

    2008-02-01

    The Global Nuclear Energy Program (GNEP) includes a program element for the development and construction of an advanced sodium cooled fast reactor to demonstrate the burning (transmutation) of significant quantities of minor actinides obtained from a separations process and fabricated into a transuranic bearing fuel assembly. To demonstrate and qualify transuranic (TRU) fuel in a fast reactor, an Advanced Burner Reactor (ABR) prototype is needed. The ABR would necessarily be started up using conventional metal alloy or oxide (U or U, Pu) fuel. Startup fuel is needed for the ABR for the first 2 to 4 core loads of fuel in the ABR. Following start up, a series of advanced TRU bearing fuel assemblies will be irradiated in qualification lead test assemblies in the ABR. There are multiple options for this startup fuel. This report provides a description of the possible startup fuel options as well as possible fabrication alternatives available to the program in the current domestic and international facilities and infrastructure.

  3. Mechanical swirler for a low-NO{sub x}, weak-swirl burner

    DOE Patents [OSTI]

    Cheng, R.K.; Yegian, D.T.

    1999-03-09

    Disclosed is a mechanical swirler for generating diverging flow in lean premixed fuel burners. The swirler of the present invention includes a central passage with an entrance for accepting a feed gas, a flow balancing insert that introduces additional pressure drop beyond that occurring in the central passage in the absence of the flow balancing insert, and an exit aligned to direct the feed gas into a combustor. The swirler also has an annular passage about the central passage and including one or more vanes oriented to impart angular momentum to feed gas exiting the annular passage. The diverging flow generated by the swirler stabilizes lean combustion thus allowing for lower production of pollutants, particularly oxides of nitrogen. 16 figs.

  4. High-Performance Ducts in Hot-Dry Climates Hoeschele, Marc [National

    Office of Scientific and Technical Information (OSTI)

    Performance Ducts in Hot-Dry Climates Hoeschele, Marc National Renewable Energy Laboratory (NREL), Golden, CO (United States); Chitwood, Rick National Renewable Energy...

  5. Building America Case Study: High Performance Ducts in Hot-Dry...

    Office of Scientific and Technical Information (OSTI)

    Ducts in Hot-Dry Climates; Technology Solutions for New and Existing Homes, Energy Efficiency & Renewable Energy (EERE) Citation Details In-Document Search Title: Building...

  6. DEVELOPING FLOW AND HEAT TRANSFER IN STRONGLY CURVED DUCTS OF RECTANGULAR CROSS-SECTION

    E-Print Network [OSTI]

    Yee, G.

    2010-01-01

    DEVELOpiNG FLOW AND HEAT TRANSFER IN STRONGLY CURVED DUCTS9092 Developing Flow and Heat Transfer in Strongly CurvedForced Convection Heat Transfer in Curved Rectangular

  7. The first of a series of high efficiency, high bmep, turbocharged two-stroke cycle diesel engines; the general motors EMD 645FB engine

    SciTech Connect (OSTI)

    Kotlin, J.J.; Dunteman, N.R.; Scott, D.I.; Williams, H.A. Jr.

    1983-01-01

    The current Electro-Motive Division 645 Series turbocharged engines are the Model FB and EC. The FB engine combines the highest thermal efficiency with the highest specific output of any EMD engine to date. The FB Series incorporates 16:1 compression ratio with a fire ring piston and an improved turbocharger design. Engine components included in the FB engine provide very high output levels with exceptional reliability. This paper also describes the performance of the lower rated Model EC engine series which feature high thermal efficiency and utilize many engine components well proven in service and basic to the Model FB Series.

  8. Model-Based Commissioning Methodology for Simple Duct System 

    E-Print Network [OSTI]

    Odajima, T.; Takashi, M.; Juckel-Murakami, B.

    2004-01-01

    and HEPA filter. For the system the VAV is used as constant air volume control device. Controlled room pressure generates airflow from Room B to A and B to C (i.e., pressure in Room B is (+ +), pressure in Room A is (+) and pressure in Room C... shown in Figure 7. As the room leakage is not a subject of this paper, it is not amplified. Figure 3. Air volume pattern for the positive pressure (++) room The duct leakage is calculated from AHU to diffuser (HEPA filter) as shown...

  9. Duct Remediation Program: Material characterization and removal/handling

    SciTech Connect (OSTI)

    Beckman, T.d.; Davis, M.M.; Karas, T.M.

    1992-11-01

    Remediation efforts were successfully performed at Rocky Flats to locate, characterize, and remove plutonium holdup from process exhaust ducts. Non-Destructive Assay (NDA) techniques were used to determine holdup locations and quantities. Visual characterization using video probes helped determine the physical properties of the material, which were used for remediation planning. Assorted equipment types, such as vacuum systems, scoops, brushes, and a rotating removal system, were developed to remove specific material types. Personnel safety and material handling requirements were addressed throughout the project.

  10. Duct Leakage Repeatability Testing (Technical Report) | SciTech Connect

    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 NaturalDukeWakefield Municipal GasAdministration Medal01TechnicalScientific andScientificDOE Data ID Service DOEandDuct

  11. Duct Chase Sprinkler Replacement Project (4594), 5/31/2012

    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 like submit theCovalentLaboratory |Sectorfor $1.14 Per GallonDataEnergyDuct Chase

  12. Low NO{sub x}/SO{sub x} Burner retrofit for utility cyclone boilers. Quarterly technical progress report, July--September 1991

    SciTech Connect (OSTI)

    Not Available

    1991-12-31

    Work on process design and LNS Burner design was deferred during this period, pending a reassessment of the project by TransAlta prior to commencement of Budget Period II, and only limited Balance of Plant engineering work was done.

  13. Evaluation of the Repeatability of the Delta Q Duct Leakage Testing Technique Including Investigation of Robust Analysis Techniques and Estimates of Weather Induced Uncertainty

    E-Print Network [OSTI]

    Dickerhoff, Darryl

    2008-01-01

    Deve lop m ent of a New Duct Leakage Test: Delta Q.    than a few cfm for tight duct systems as long as at leastHowever houses with leakier duct systems seem to have less

  14. EPA's (Environmental Protection Agency's) program for evaluation and demonstration of low-cost retrofit LIMB (Limestone Injection Multistage Burner) technology

    SciTech Connect (OSTI)

    Stern, R.D.

    1987-09-01

    This paper discusses program objectives, approaches, current status and results, future activities, and schedules for EPA's program for research and development, field evaluation, and demonstration of Limestone Injection Multistage Burner (LIMB) technology. Primary emphasis is on: (1) the full-scale demonstration being conducted on Ohio Edison's 104-MW wall-fired Edgewater Station Unit 4; (2) evaluation on a 50 million Btu/hr tangentially fired prototype nearing completion; (3) on-going field evaluation on Richmond Power and Light's 61-MW tangentially fired Whitewater Valley Generating Station Unit 2. The new program for demonstration on Virginia Electric Power's 180-MW tangentially fired Yorktown II Plant is also described. The LIMB process is based on injecting dry sorbents into the boiler for direct capture of SO/sub 2/ from the combustion gases. LIMB combines sorbent injection for SO/sub 2/ control with the use of low-NOx burners, in which staged combustion is utilized for NOx control.

  15. Low NO{sub x}/SO{sub x} Burner retrofit for utility cyclone boilers. Public design report

    SciTech Connect (OSTI)

    Not Available

    1991-09-01

    This Public Design Report provides available nonproprietary design information on the Low NO{sub x}SO{sub x} Burner Retrofit of Utility Cyclone Boilers project. In addition to the design aspects, the history of the project, the organization of the project, and the role of the funding parties are discussed. An overview of the Low NO{sub x}SO{sub x} (LNS) Burner, the cyclone boiler and the Southern Illinois Power Cooperative host site is presented. A detailed nonproprietary description of the individual process steps, plant systems, and resulting performance then follows. Narrative process descriptions, simplified process flow diagrams, input/output stream data, operating conditions and requirements are given for each unit. The plant demonstration program and start up provisions, the environmental considerations and control, monitoring and safety factors that are considered are also addressed.

  16. Phase Stability of an HT-9 Duct Irradiated in FFTF

    SciTech Connect (OSTI)

    O. Anderoglu; J. Van den Bosch; B. H. Sencer; E. Stergar; D. Bhattacharya; P. Dickerson; M. Hartl; S.A. Maloy; P. Hosemann

    2012-11-01

    A fuel test assembly known as ACO-3 duct made out of a fully tempered ferritic/martensitic steel (HT-9) was previously irradiated in the Fast Flux Test Reactor Facility (FFTF) up to 155 dpa at a temperature range of 380-504°C. The microstructures of the samples from 5 different zones along the face of the duct were analyzed using a combination of TEM based techniques, SANS and APT. A high density of Cr rich a' precipitates together with moderate density G-phase precipitates with an average sizes of 5 and 11 nm respectively were found at 20 dpa, 380°C zone. It was found that the precipitations of the second phases are more sensitive to temperature then the dose. In general, the density of both precipitates decreases with increasing irradiation temperature. No significant change is observed in average size of a' while the average size of G-phase precipitates increases up to 27 nm at 440°C. Voids are seen at 100 (410°C) and 155 (440°C) dpa zones but none was detected at 96 dpa (466°C) zone. In contrast to what is reported in the literature, no laves or Chi phases were found in any of the zones.

  17. Reflection and Ducting of Gravity Waves Inside the Sun

    E-Print Network [OSTI]

    MacGregor, K B

    2011-01-01

    Internal gravity waves excited by overshoot at the bottom of the convection zone can be influenced by rotation and by the strong toroidal magnetic field that is likely to be present in the solar tachocline. Using a simple Cartesian model, we show how waves with a vertical component of propagation can be reflected when traveling through a layer containing a horizontal magnetic field with a strength that varies with depth. This interaction can prevent a portion of the downward-traveling wave energy flux from reaching the deep solar interior. If a highly reflecting magnetized layer is located some distance below the convection zone base, a duct or wave guide can be set up, wherein vertical propagation is restricted by successive reflections at the upper and lower boundaries. The presence of both upward- and downward-traveling disturbances inside the duct leads to the existence of a set of horizontally propagating modes that have significantly enhanced amplitudes. We point out that the helical structure of these ...

  18. Simplified configuration for the combustor of an oil burner using a low pressure, high flow air-atomizing nozzle

    DOE Patents [OSTI]

    Butcher, Thomas A. (Port Jefferson, NY); Celebi, Yusuf (Middle Island, NY); Fisher, Leonard (Colrain, MA)

    2000-09-15

    The invention relates to clean burning of fuel oil with air. More specifically, to a fuel burning combustion head using a low-pressure, high air flow atomizing nozzle so that there will be a complete combustion of oil resulting in a minimum emission of pollutants. The improved fuel burner uses a low pressure air atomizing nozzle that does not result in the use of additional compressors or the introduction of pressurized gases downstream, nor does it require a complex design. Inventors:

  19. Experimental study on NOx emission and unburnt carbon of a radial biased swirl burner for coal combustion

    SciTech Connect (OSTI)

    Shan Xue; Shi'en Hui; Qulan Zhou; Tongmo Xu

    2009-07-15

    Pilot tests were carried out on a 1 MW thermal pulverized coal fired testing furnace. Symmetrical combustion was implemented by use of two whirl burners with dual air adjustment. The burnout air device was installed in various places at the top of the main burner, which consists of a primary air pipe with a varying cross-section and an impact ring. In the primary air pipe, the air pulverized coal (PC) stream was separated into a whirling stream that was thick inside and thin outside, thus realizing the thin-thick distribution at the burner nozzle in the radial direction. From the comparative combustion tests of three coals with relatively great characteristic differences, Shaanbei Shenhua high rank bituminous coal (SH coal), Shanxi Hejin low rank bituminous coal (HJ coal), and Shanxi Changzhi meager coal (CZ coal), were obtained such test results as the primary air ratio, inner secondary air ratio, outer secondary air ratio, impact of the change of outer secondary air, change of the relative position for the layout of burnout air, change of the swirling intensity of the primary air and secondary air, etc., on the NOx emission, and unburnt carbon content in fly ash (CFA). At the same time, the relationship between the NOx emission and burnout ratio and affecting factors of the corresponding test items on the combustion stability and economic results were also acquired. The results may provide a vital guiding significance to engineering designs and practical applications. According to the experimental results, the influence of each individual parameter on NOx formation and unburned carbon in fly ash agrees well with the existing literature. In this study, the influences of various combinations of these parameters are also examined, thus providing some reference for the design of the radial biased swirl burner, the configuration of the furnace, and the distribution of the air. 23 refs., 14 figs., 2 tabs.

  20. Non-Newtonian Bile Flow in Elastic Cystic Duct: One-and Three-Dimensional Modeling

    E-Print Network [OSTI]

    Luo, Xiaoyu

    - tion) and in gallbladder pain. In this paper, we extend our previous study of the human biliary system2 Sudden expansion head-loss coefficient c4 Head-loss coefficient for a 90Ā° bend d Internal diameter of duct, mm E Young's modulus of cystic duct wall, Pa f Darcy friction factor f0 Darcy friction factor

  1. Ducted Turbine Blade Optimization Using Numerical Simulation Michael Shives and Curran Crawford

    E-Print Network [OSTI]

    Pedersen, Tom

    Ducted Turbine Blade Optimization Using Numerical Simulation Michael Shives and Curran Crawford analysis and optimization of ducted turbines. The model is similar to standard blade element momentum. This eliminates many assumptions used in applying the typical blade element momentum (BEM) theory to a turbine

  2. Static Pressure Loss in 12”, 14”, and 16” Non-metallic Flexible Duct 

    E-Print Network [OSTI]

    Cantrill, David Lee

    2013-08-01

    This study was conducted to determine the effects of compression on pressure drops in non-metallic flexible duct. Duct sizes of 12”, 14” and 16” diameters were tested at a five different compression ratios (maximum stretch, 4%, 15%, 30% and 45...

  3. Contrasting the efficiency of radiation belt losses caused by ducted and nonducted whistlermode waves

    E-Print Network [OSTI]

    Cummer, Steven A.

    Contrasting the efficiency of radiation belt losses caused by ducted and nonducted whistlermode, nonducted VLF waves are much less effective in driving radiation belt pitch angle scattering. Citation. Parrot, and J.J. Berthelier (2010), Contrasting the efficiency of radiation belt losses caused by ducted

  4. Physics Basis and Mechanical Design of the Actively Cooled Duct Scraper Protection for the JET Neutral Beam Enhancement

    E-Print Network [OSTI]

    Physics Basis and Mechanical Design of the Actively Cooled Duct Scraper Protection for the JET Neutral Beam Enhancement

  5. Laminar burn rates of gun propellants measured in the high-pressure strand burner

    SciTech Connect (OSTI)

    Reaugh, J. E., LLNL

    1997-10-01

    The pressure dependence of the laminar burn rate of gun propellants plays a role in the design and behavior of high-performance guns. We have begun a program to investigate the effects of processing variables on the laminar burn rates, using our high-pressure strand burner to measure these rates at pressures exceeding 700 MPa. We have burned JA2 and M43 propellant samples, provided by Dr. Arpad Juhasz, ARL, from propellant lots previously used in round-robin tests. Our results at room temperature are in accord with other measurements. In addition, we present results measured for propellant that has been preheated to 50 C before burning. We used our thermochemical equilibrium code, CHEETAH, to help interpret the simultaneous pressure and temperature measurements taken during the testing, and show examples of its use. It has been modified to provide performance measures and equations of state for the products that are familiar to the gun-propellant community users of BLAKE.

  6. Oxy-Combustion Burner and Integrated Pollutant Removal Research and Development Test Facility

    SciTech Connect (OSTI)

    Mark Schoenfield; Manny Menendez; Thomas Ochs; Rigel Woodside; Danylo Oryshchyn

    2012-09-30

    A high flame temperature oxy-combustion test facility consisting of a 5 MWe equivalent test boiler facility and 20 KWe equivalent IPRĀ® was constructed at the Hammond, Indiana manufacturing site. The test facility was operated natural gas and coal fuels and parametric studies were performed to determine the optimal performance conditions and generated the necessary technical data required to demonstrate the technologies are viable for technical and economic scale-up. Flame temperatures between 4930-6120F were achieved with high flame temperature oxy-natural gas combustion depending on whether additional recirculated flue gases are added to balance the heat transfer. For high flame temperature oxy-coal combustion, flame temperatures in excess of 4500F were achieved and demonstrated to be consistent with computational fluid dynamic modeling of the burner system. The project demonstrated feasibility and effectiveness of the Jupiter Oxygen high flame temperature oxy-combustion process with Integrated Pollutant Removal process for CCS and CCUS. With these technologies total parasitic power requirements for both oxygen production and carbon capture currently are in the range of 20% of the gross power output. The Jupiter Oxygen high flame temperature oxy-combustion process has been demonstrated at a Technology Readiness Level of 6 and is ready for commencement of a demonstration project.

  7. Global Search for New Physics with 2.0 fb88-1 at CDF

    SciTech Connect (OSTI)

    Aaltonen, T.; Adelman, J.; Akimoto, T.; Albrow, Michael G.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, Dante E.; Anastassov, A.; Annovi, Alberto; Antos, J.; Apollinari, G.; /Fermilab /Purdue U.

    2008-09-01

    Data collected in Run II of the Fermilab Tevatron are searched for indications of new electroweak-scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with the standard model prediction. A model-independent approach (VISTA) considers gross features of the data, and is sensitive to new large cross-section physics. Further sensitivity to new physics is provided by two additional algorithms: a Bump Hunter searches invariant mass distributions for 'bumps' that could indicate resonant production of new particles; and the Sleuth procedure scans for data excesses at large summed transverse momentum. This combined global search for new physics in 2.0 fb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV reveals no indication of physics beyond the standard model.

  8. Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb?¹ of pp? collisions

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

    Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; et al

    2011-09-16

    We present an updated measurement of the anomalous like-sign dimuon charge asymmetry Absl for semileptonic b-hadron decays in 9.0 fb?¹ of pp? collisions recorded with the D0 detector at a center-of-mass energy of ?s=1.96 TeV at the Fermilab Tevatron collider. We obtain Absl=(-0.787±0.172(stat)±0.093(syst))%. This result differs by 3.9 standard deviations from the prediction of the standard model and provides evidence for anomalously large CP violation in semileptonic neutral B decay. The dependence of the asymmetry on the muon impact parameter is consistent with the hypothesis that it originates from semileptonic b-hadron decays.

  9. Design of an Overmoded-Waveguide Directional Antenna for Use in In-Building Ventilation Duct Wireless Networks

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Design of an Overmoded-Waveguide Directional Antenna for Use in In-Building Ventilation Duct ventilation ducts. We obtain experimentally the element size and spacing of a reflector and driven element that can be used for IEEE 802.11b/g/n signals in a cylindrical duct to provide 3.1 dB of gain and a front

  10. Cut-on cut-off transition in flow ducts: comparing multiple-scales and finite-element solutions

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    Cut-on cut-off transition in flow ducts: comparing multiple-scales and finite-element solutions Eindhoven, The Netherlands. The phenomenon of cut-on cut-off transition of acoustic modes in ducts with mean from a numerical finite-element method. The analytical solution, derived for an arbitrary duct

  11. Numerical Analysis of Turbine Blade Cooling Ducts M.J. Noot and R.M.M. Mattheij

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    Numerical Analysis of Turbine Blade Cooling Ducts M.J. Noot and R.M.M. Mattheij Eindhoven the cooling ducts with ribs, so­called turbulators. It is investigated how these ribs influence the heat the quality of these cooling ducts. 1 Introduction Gas turbines play an important role in aviation

  12. Design of efficient lens ducts Rulian Fu, Guangjun Wang, Zhaoqi Wang, Enxu Ba, Guoguang Mu, and Xin-Hua Hu

    E-Print Network [OSTI]

    Design of efficient lens ducts Rulian Fu, Guangjun Wang, Zhaoqi Wang, Enxu Ba, Guoguang Mu, and Xin-Hua Hu Lens ducts have the potential to couple the output from a laser diode array efficiently- tigate different design approaches of lens ducts and demonstrate the possibility to obtain an output beam

  13. Title: Overexpression of Follistatin in the Mouse Epididymis Disrupts Fluid Resorption and Sperm Transit in Testicular Excurrent Ducts.

    E-Print Network [OSTI]

    and Sperm Transit in Testicular Excurrent Ducts. Short Title: Elevated follistatin causes epididymal ducts and initial segment of the epididymis, as indicated by accumulation of fluid and sperm stasis is essential for normal testicular excurrent duct function and that its blockade impairs fertility

  14. Wednesday, 06 October, 2010 Contrasting the efficiency of radiation belt losses caused by ducted and non-1

    E-Print Network [OSTI]

    Otago, University of

    Wednesday, 06 October, 2010 1 Contrasting the efficiency of radiation belt losses caused by ducted and non-1 ducted whistler mode waves from ground-based transmitters2 Craig J. Rodger and Bonar R. Carson3 plasmaspheric whistler ducts which guide the waves. For non-guided cases these waves are21 said to be "nonducted

  15. 1736 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 51, NO. 10, OCTOBER 2003 Impulse Response of the HVAC Duct as a

    E-Print Network [OSTI]

    Stancil, Daniel D.

    of the HVAC Duct as a Communication Channel Pavel V. Nikitin, Member, IEEE, Daniel D. Stancil, Senior Member (HVAC) ducts in buildings behave as multimode waveguides when excited at radio frequencies and thus, can be used to distribute radio signals. The channel properties of the ducts are different from the properties

  16. Stability analysis and design of time-domain acoustic impedance boundary conditions for lined duct with mean flow

    E-Print Network [OSTI]

    Huang, Xun

    Stability analysis and design of time-domain acoustic impedance boundary conditions for lined duct in a lined duct with uniform mean flow, which has important practical interest for noise emission by aero boundary conditions act as closed-loop feedbacks to an overall duct acoustic system. It turns out

  17. Secondary ow and forced convection heat transfer near endwall boundary layer fences in a 90 turning duct

    E-Print Network [OSTI]

    Camci, Cengiz

    ° turning duct Cengiz Camci *, Dean H. Rizzo Turbomachinery Heat Transfer Laboratory, Department with the secondary Æow and heat transfer aspects of endwall boundary layer fences in 90° turning ducts. Boundary coolant channel is simulated by a 90° turning duct (ReD 360,000) to study the aerothermal interaction

  18. Study of instabilities and quasi-two-dimensional turbulence in volumetrically heated magnetohydrodynamic flows in a vertical rectangular duct

    E-Print Network [OSTI]

    Abdou, Mohamed

    magnetohydrodynamic flows in a vertical rectangular duct N. Vetcha, S. Smolentsev, M. Abdou, and R. Moreau Citation in a vertical rectangular duct N. Vetcha,1 S. Smolentsev,1,a) M. Abdou,1 and R. Moreau2 1 Mechanical 2013; published online 15 February 2013) We consider magnetohydrodynamic (MHD) rectangular duct flows

  19. 7/11/00-draft copy: do not quote 1 of 30 New Technologies for Residential HVAC Ducts

    E-Print Network [OSTI]

    7/11/00-draft copy: do not quote 1 of 30 New Technologies for Residential HVAC Ducts Burke Treidler, and are difficult to install in a manner which will insure no leaks. This report summarizes the potential for new technologies for ducts, duct fittings, and insulation. It begins with a review of what technology is currently

  20. Protein Expression Profile of an Environmentally Important Bacterial Strain: the Chromate Response of Arthrobacter Species Strain FB24

    SciTech Connect (OSTI)

    Henne, Kristene L.; Turse, Joshua E.; Nakatsu, C. H.; Konopka, Allan

    2011-05-03

    The global proteomic response of Arthrobacter sp. strain FB24 to different levels of chromate stress was evaluated with both two-dimensional gel electrophoresis (2-DGE) and liquid chromatography coupled to tandem mass spectrometry (LC/LC-MS/MS) [Henne et al. 2009b]. Proteome coverage of 22% and 71% was obtained with 2-DGE and LC/LC-MS/MS, respectively. The strong response of strain FB24 to chromate suggests a condition of sulfur limitation, which could be driven by competition for the sulfate transporter by the structurally similar chromate ion. Additionally, the involvement of genes hypothesized to be directly involved in chromate resistance in strain FB24 was supported at the protein level.

  1. Duct leakage impacts on VAV system performance in California large commercial buildings

    SciTech Connect (OSTI)

    Wray, Craig P.; Matson, Nance E.

    2003-10-01

    The purpose of this study is to evaluate the variability of duct leakage impacts on air distribution system performance for typical large commercial buildings in California. Specifically, a hybrid DOE-2/TRNSYS sequential simulation approach was used to model the energy use of a low-pressure terminal-reheat variable-air-volume (VAV) HVAC system with six duct leakage configurations (tight to leaky) in nine prototypical large office buildings (representing three construction eras in three California climates where these types of buildings are common). Combined fan power for the variable-speed-controlled supply and return fans at design conditions was assumed to be 0.8 W/cfm. Based on our analyses of the 54 simulation cases, the increase in annual fan energy is estimated to be 40 to 50% for a system with a total leakage of 19% at design conditions compared to a tight system with 5% leakage. Annual cooling plant energy also increases by about 7 to 10%, but reheat energy decreases (about 3 to 10%). In combination, the increase in total annual HVAC site energy is 2 to 14%. The total HVAC site energy use includes supply and return fan electricity consumption, chiller and cooling tower electricity consumption, boiler electricity consumption, and boiler natural gas consumption. Using year 2000 average commercial sector energy prices for California ($0.0986/kWh and $7.71/Million Btu), the energy increases result in 9 to 18% ($7,400 to $9,500) increases in HVAC system annual operating costs. Normalized by duct surface area, the increases in annual operating costs are 0.14 to 0.18 $/ft{sup 2}. Using a suggested one-time duct sealing cost of $0.20 per square foot of duct surface area, these results indicate that sealing leaky ducts in VAV systems has a simple payback period of about 1.3 years. Even with total leakage rates as low as 10%, duct sealing is still cost effective. This suggests that duct sealing should be considered at least for VAV systems with 10% or more total duct leakage. The VAV system that we simulated had perfectly insulated ducts, and maintained constant static pressure in the ducts upstream of the VAV boxes and a constant supply air temperature at the airhandler. Further evaluations of duct leakage impacts should be carried out in the future after methodologies are developed to deal with duct surface heat transfer effects, to deal with airflows entering VAV boxes from ceiling return plenums (e.g., to model parallel fan-powered VAV boxes), and to deal with static pressure reset and supply air temperature reset strategies.

  2. Device for temporarily closing duct-formers in well completion apparatus

    SciTech Connect (OSTI)

    Zandmer, H.M.; Zandmer, S.M.

    1981-08-25

    A duct-forming device is disclosed for use in a well completion apparatus of the kind, wherein a bore hole casing is positioned in a bore hole and duct-forming devices of alkali- and acid resistant metal-such as steel-are secured at spaced levels to the casing in alignment with holes machined in the casing wall. In accordance with the invention, a closure device is arranged within the duct-forming device which permits flow of predetermined amounts of liquid, such as acid, from the interior of the casing through the duct-forming device and into the producing formation, while gradually being moved by the liquid into a position in which such fluid flow is prevented. After the fluid flow has been stopped by the closure device and when the formation pressure exceeds the pressure within the duct-forming device and the casing, fluid from the formation then forces the closure device toward and into the casing space to permit thereafter free flow of formation fluid into the duct-forming device and the casing or of pressurized treatment liquid from the casing into the formation. The inventive arrangement permits inter alia the establishment of a sufficient and substantially uniform feeding rate of treatment liquid, such as acid, from the casing into the producing formation through all the duct-formers in preparation for subsequent acidification or other treatments, such as sand fracking.

  3. Qualification of Fan Generated Duct Rumble Noise: Part 1: Test Facility(RP 1219) 

    E-Print Network [OSTI]

    Kading, J.; Mann, A.; Pate, M.B.

    2008-01-01

    :4. The transition was enclosed in a 53” by 93” by 3’ tall box constructed from MDF and lined with 2” duct board fiber- glass. The box was designed to isolate the transition duct from break in noise from the fan room. The fiberglass insulation on the inside... (MDF) shell that was mounted on a 2x4 structure. The interior consisted of three layers. The first was fiberglass board 2’x 4’ x 2”, these boards were cut to be stacked and fill in between the MDF and the duct lining insu- lation. The second layer...

  4. Advanced Fuel Cycle Economic Analysis of Symbiotic Light-Water Reactor and Fast Burner Reactor Systems

    SciTech Connect (OSTI)

    D. E. Shropshire

    2009-01-01

    The Advanced Fuel Cycle Economic Analysis of Symbiotic Light-Water Reactor and Fast Burner Reactor Systems, prepared to support the U.S. Advanced Fuel Cycle Initiative (AFCI) systems analysis, provides a technology-oriented baseline system cost comparison between the open fuel cycle and closed fuel cycle systems. The intent is to understand their overall cost trends, cost sensitivities, and trade-offs. This analysis also improves the AFCI Program’s understanding of the cost drivers that will determine nuclear power’s cost competitiveness vis-a-vis other baseload generation systems. The common reactor-related costs consist of capital, operating, and decontamination and decommissioning costs. Fuel cycle costs include front-end (pre-irradiation) and back-end (post-iradiation) costs, as well as costs specifically associated with fuel recycling. This analysis reveals that there are large cost uncertainties associated with all the fuel cycle strategies, and that overall systems (reactor plus fuel cycle) using a closed fuel cycle are about 10% more expensive in terms of electricity generation cost than open cycle systems. The study concludes that further U.S. and joint international-based design studies are needed to reduce the cost uncertainties with respect to fast reactor, fuel separation and fabrication, and waste disposition. The results of this work can help provide insight to the cost-related factors and conditions needed to keep nuclear energy (including closed fuel cycles) economically competitive in the U.S. and worldwide. These results may be updated over time based on new cost information, revised assumptions, and feedback received from additional reviews.

  5. Hurricane Disturbance Alters Secondary Forest Recovery in Puerto Rico Dan F.B. Flynn1,7

    E-Print Network [OSTI]

    Uriarte, Maria

    Hurricane Disturbance Alters Secondary Forest Recovery in Puerto Rico Dan F.B. Flynn1,7 , Mar structure and composition. How introduced species respond to disturbances such as hurricanes in post-agriculture forest recovery is of particular interest. To examine the effects of hurricane disturbance and previous

  6. 11th AIAA/CEAS Aeroacoustics Conference, 23-25 May 2005, Monterey, CA, USA Acoustic Modes in a Ducted Shear Flow

    E-Print Network [OSTI]

    Rienstra, Sjoerd W.

    in a Ducted Shear Flow Gregory Vilenski Sjoerd W. Rienstra Eindhoven University of Technology, 5600 MB inside a duct is considered. For isentropic flow in a circular duct with zero swirl and constant mean on the coordinate axes x,r and , p = density and pressure s = tip-to-hub ratio h = dimensional inner duct radius d

  7. Static Pressure Losses in 6 in., 8 in., and 10 in. Nonmetallic Flexible Duct (RP-1333) 

    E-Print Network [OSTI]

    Weaver, K.; Culp, C.H.

    2007-01-01

    with permission of the copyright owner. Further reproduction prohibited without permission. Static Pressure Losses in Nonmetallic Flexible Duct Weaver, Kevin;Culp, Charles ASHRAE Transactions; 2007; 113, ProQuest pg. 400 Reproduced with permission...

  8. Turbulent mixing in ducts, theory and experiment application to aerosol single point sampling 

    E-Print Network [OSTI]

    Langari, Abdolreza

    1997-01-01

    The Environmental Protection Agency (EPA) has announced rules for continuous emissions monitoring (CEM) of stacks and ducts in nuclear facilities. EPA has recently approved use of Alternative Reference Methodologies (ARM) for air sampling in nuclear...

  9. Particle image velocimetry in an advanced, serpentine jet engine inlet duct 

    E-Print Network [OSTI]

    Tichenor, Nathan Ryan

    2009-05-15

    The overarching objective of this research project was to gain improved basic understanding of the fluid mechanisms governing the development of secondary flow structures in complex, three-dimensional inlet ducts. To accomplish this objective...

  10. Inspection, Assessment, and Repair of Grouted Ducts in Post-tensioned Bridge 

    E-Print Network [OSTI]

    Im, Seok Been

    2011-02-22

    Segmental post-tensioned (PT) bridges are major structures that carry significant traffic. Recent investigations of these bridges have identified voids in their ducts. and some of these exposed strands at these void locations are undergoing...

  11. On the Fundamental Unsteady Fluid Dynamics of Shock-Induced Flows through Ducts 

    E-Print Network [OSTI]

    Mendoza, Nicole Renee

    2013-04-29

    Unsteady shock wave propagation through ducts has many applications, ranging from blast wave shelter design to advanced high-speed propulsion systems. The research objective of this study was improved fundamental understanding of the transient flow...

  12. An Experimental Evaluation of Duct-Mounted Relative Humidity Sensors: Part 2 – Accuracy Results 

    E-Print Network [OSTI]

    Joshi, S.N.; Pate, M.B.; Nelson, R.M; House, J.H.; Klaasen, C.J.

    2005-01-01

    Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. An Experimental Evaluation of Duct-Mounted Relative Humidity Sensors: Part 2-Accuracy Results Joshi, Shailesh N;House, John M;Pate, Michael B...

  13. DOE Zero Energy Ready Home Ducts in Conditioned Space Webinar (Text Version)

    Broader source: Energy.gov [DOE]

    Below is a text version of the webinar titled "Design Strategies for Ducts in Conditioned Spaces," originally presented in March 2014 and part of DOE Challenge Home's Tech Training Webinar Series....

  14. Augmentation of Power Output of Axisymmetric Ducted Wind Turbines by Porous Trailing Edge Disks

    E-Print Network [OSTI]

    widnall, sheila

    2014-06-30

    This paper presents analytical and experimental results that demonstrated that the power output from a ducted wind turbine can be dramatically increased by the addition of a trailing edge device such as a porous disk. In ...

  15. Observations on the Anterior Testicular Ducts in Snakes With Emphasis on Sea Snakes and

    E-Print Network [OSTI]

    Sever, David M.

    and Ultrastructure in the Yellow-Bellied Sea Snake, Pelamis platurus David M. Sever* and Layla R. Freeborn Department, Pelamis platurus, only the third such study on snakes. The anterior testicular ducts are similar in his

  16. A Computational Study of Icing Effects on the Performance of an S-Duct Inlet

    E-Print Network [OSTI]

    Jin, Wonjin

    2009-01-01

    The performance of a diffusing S-duct inlet (M2129) is computationally studied for the effects of inlet icing. Different ice accretion shapes, predicted by numerical analysis in the literature reviewed, are simulated on the inlet lip. Two commercial...

  17. Comparative Study: CFD ?P Versus Measured ?P for 30% Flexible Ducts 

    E-Print Network [OSTI]

    Ugursal, A.; Culp, C.

    2006-01-01

    VERSUS MEASURED ?P FOR 30% FLEXIBLE DUCTS Ahmet U?ursal Ph.D. Student, Department of Architecture Texas A&M University College Station, TX Charles Culp, Ph.D., P.E. Associate Professor, Department of Architecture & Associate Director, Energy... Systems Lab Texas A&M University College Station, TX ABSTRACT This study modeled air flow and pressure drops in non-metallic flexible ducts using Computational Fluid Dynamic (CFD) analysis. CFD simulation results showed very close comparison...

  18. An optimal path to transition in a duct

    E-Print Network [OSTI]

    Biau, Damien; 10.1098/rsta.2008.0191

    2010-01-01

    This paper is concerned with the transition of the laminar flow in a duct of square cross-section. Like in the similar case of the pipe flow, the motion is linearly stable for all Reynolds numbers, rendering this flow a suitable candidate for a study of the 'bypass' path to turbulence. It has already been shown \\citep{Biau_JFM_2008} that the classical linear optimal perturbation problem, yielding optimal disturbances in the form of longitudinal vortices, fails to provide an 'optimal' path to turbulence, i.e. optimal perturbations do not elicit a significant nonlinear response from the flow. Previous simulations have also indicated that a pair of travelling waves generates immediately, by nonlinear quadratic interactions, an unstable mean flow distortion, responsible for rapid breakdown. By the use of functions quantifying the sensitivity of the motion to deviations in the base flow, the 'optimal' travelling wave associated to its specific defect is found by a variational approach. This optimal solution is the...

  19. Use of freeze-casting in advanced burner reactor fuel design

    SciTech Connect (OSTI)

    Lang, A. L.; Yablinsky, C. A.; Allen, T. R. [Dept. of Engineering Physics, Univ. of Wisconsin Madison, 1500 Engineering Drive, Madison, WI 53711 (United States); Burger, J.; Hunger, P. M.; Wegst, U. G. K. [Thayer School of Engineering, Dartmouth College, 8000 Cummings Hall, Hanover, NH 03755 (United States)

    2012-07-01

    This paper will detail the modeling of a fast reactor with fuel pins created using a freeze-casting process. Freeze-casting is a method of creating an inert scaffold within a fuel pin. The scaffold is created using a directional solidification process and results in open porosity for emplacement of fuel, with pores ranging in size from 300 microns to 500 microns in diameter. These pores allow multiple fuel types and enrichments to be loaded into one fuel pin. Also, each pore could be filled with varying amounts of fuel to allow for the specific volume of fission gases created by that fuel type. Currently fast reactors, including advanced burner reactors (ABR's), are not economically feasible due to the high cost of operating the reactors and of reprocessing the fuel. However, if the fuel could be very precisely placed, such as within a freeze-cast scaffold, this could increase fuel performance and result in a valid design with a much lower cost per megawatt. In addition to competitive costs, freeze-cast fuel would also allow for selective breeding or burning of actinides within specific locations in fast reactors. For example, fast flux peak locations could be utilized on a minute scale to target specific actinides for transmutation. Freeze-cast fuel is extremely flexible and has great potential in a variety of applications. This paper performs initial modeling of freeze-cast fuel, with the generic fast reactor parameters for this model based on EBR-II. The core has an assumed power of 62.5 MWt. The neutronics code used was Monte Carlo N-Particle (MCNP5) transport code. Uniform pore sizes were used in increments of 100 microns. Two different freeze-cast scaffold materials were used: ceramic (MgO-ZrO{sub 2}) and steel (SS316L). Separate models were needed for each material because the freeze-cast ceramic and metal scaffolds have different structural characteristics and overall porosities. Basic criticality results were compiled for the various models. Preliminary results show that criticality is achievable with freeze-cast fuel pins despite the significant amount of inert fuel matrix. Freeze casting is a promising method to achieve very precise fuel placement within fuel pins. (authors)

  20. Preliminary core design studies for the advanced burner reactor over a wide range of conversion ratios.

    SciTech Connect (OSTI)

    Hoffman, E. A.; Yang, W. S.; Hill, R. N.; Nuclear Engineering Division

    2008-05-05

    A consistent set of designs for 1000 MWt commercial-scale sodium-cooled Advance Burner Reactors (ABR) have been developed for both metal and oxide-fueled cores with conversion ratios from breakeven (CR=1.0) to fertile-free (CR=0.0). These designs are expected to satisfy thermal and irradiation damage limits based on the currently available data. The very low conversion ratio designs require fuel that is beyond the current fuel database, which is anticipated to be qualified by and for the Advanced Burned Test Reactor. Safety and kinetic parameters were calculated, but a safety analysis was not performed. Development of these designs was required to achieve the primary goal of this study, which was to generate representative fuel cycle mass flows for system studies of ABRs as part of the Global Nuclear Energy Partnership (GNEP). There are slight variations with conversion ratio but the basic ABR configuration consists of 144 fuel assemblies and between 9 and 22 primary control assemblies for both the metal and oxide-fueled cores. Preliminary design studies indicated that it is feasible to design the ABR to accommodate a wide range of conversion ratio by employing different assembly designs and including sufficient control assemblies to accommodate the large reactivity swing at low conversion ratios. The assemblies are designed to fit within the same geometry, but the size and number of fuel pins within each assembly are significantly different in order to achieve the target conversion ratio while still satisfying thermal limits. Current irradiation experience would allow for a conversion ratio of somewhat below 0.75. The fuel qualification for the first ABR should expand this experience to allow for much lower conversion ratios and higher bunrups. The current designs were based on assumptions about the performance of high and very high enrichment fuel, which results in significant uncertainty about the details of the designs. However, the basic fuel cycle performance trends such as conversion ratio and mass flow parameters are less sensitive to these parameters and the current results should provide a good basis for static and dynamic system analysis. The conversion ratio is fundamentally a ratio of the macroscopic cross section of U-238 capture to that of TRU fission. Since the microscopic cross sections only change moderately with fuel design and isotopic concentration for the fast reactor, a specific conversion ratio requires a specific enrichment. The approximate average charge enrichment (TRU/HM) is 14%, 21%, 33%, 56%, and 100% for conversion ratios of 1.0, 0.75, 0.50, 0.25, and 0.0 for the metal-fueled cores. The approximate average charge enrichment is 17%, 25%, 38%, 60%, and 100% for conversion ratios of 1.0, 0.75, 0.50, 0.25, and 0.0 for the oxide-fueled core. For the split batch cores, the maximum enrichment will be somewhat higher. For both the metal and oxide-fueled cores, the reactivity feedback coefficients and kinetics parameters seem reasonable. The maximum single control assembly reactivity faults may be too large for the low conversion ratio designs. The average reactivity of the primary control assemblies was increased, which may cause the maximum reactivity of the central control assembly to be excessive. The values of the reactivity coefficients and kinetics parameters show that some values appear to improve significantly at lower conversion ratios while others appear far less favorable. Detailed safety analysis is required to determine if these designs have adequate safety margins or if appropriate design modifications are required. Detailed system analysis data has been generated for both metal and oxide-fueled core designs over the entire range of potential burner reactors. Additional data has been calculated for a few alternative fuel cycles. The systems data has been summarized in this report and the detailed data will be provided to the systems analysis team so that static and dynamic system analyses can be performed.

  1. A note on comparing response times in the M/GI/1/FB and M/GI/1/PS queues

    E-Print Network [OSTI]

    the overall mean response time (a.k.a. sojourn time) of the PS and FB queues under an M/GI/1 system. We show from optimal mean response time (a.k.a sojourn time). The Shortest-Remaining-Processing-Time (SRPT have the least attained service (a.k.a age), they time-share the processor via PS. By biasing towards

  2. A note on comparing response times in the M/GI/1/FB and M/GI/1/PS queues

    E-Print Network [OSTI]

    the overall mean response time (a.k.a. sojourn time) of the PS and FB queues under an M/GI/1 system. We show from optimal mean response time (a.k.a sojourn time). The ShortestĀ­RemainingĀ­ProcessingĀ­Time (SRPT have the least attained service (a.k.a age), they timeĀ­share the processor via PS. By biasing towards

  3. Pressure Losses in 12”, 15” and 16” Non-Metallic Flexible Ducts with Compression and Sag (RP-1333) 

    E-Print Network [OSTI]

    Culp, C.H.; Cantrill, D.

    2009-01-01

    is based on findings resulting from ASHRAE Research Project RP-1333. ABSTRACT A study was conducted to measure air pressure loss in non- metallic flexible ducts and included 12” (305 mm), 14” (356 mm) and 16” (406 mm) diameter ducts on a flat surface... and also positioned over joists on 24” (610 mm) centers. For this study, flexible duct compression configurations were fully stretched and 4%, 15%, 30% and 45% compressed. Measure- ments were performed at each compression. All tests were performed...

  4. Low NO{sub x}/SO{sub x} Burner retrofit for utility cyclone boilers. Quarterly technical progress report, June--September 1990

    SciTech Connect (OSTI)

    Not Available

    1990-12-31

    The objective of this project is to demonstrate the LNS Burner as retrofitted to the host cyclone boiler for effective low-cost control of NO{sub x} and SO{sub x} emissions while firing a bituminous coal. The LNS Burner employs a simple, innovative combustion process to burn pulverized coal at high temperatures and provides effective, low-cost control of sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) emissions. The coal ash contains sulfur and is removed in the form of molten slag and flyash. Cyclone-fired boiler units are typically older units firing high-sulfur bituminous coals at very high temperatures which results in very high NO{sub x} and SO{sub x} emissions. The addition of conventional emission control equipment, such as wet scrubbers, to these older cyclone units in order to meet current and future environmental regulations is generally not economic. Further, the units are generally not compatible with low sulfur coal switching for S0{sub 2} control or selective catalytic reduction technologies for NO{sub x} control. Because the LNS Burner operates at the same very high temperatures as a typical cyclone boiler and produces a similar slag product, it may offer a viable retrofit option for cyclone boiler emission control. This was confirmed by the Cyclone Boiler Retrofit Feasibility Study carried out by TransAlta and an Operating Committee formed of cyclone boiler owners in 1989. An existing utility cyclone boiler, was then selected for the evaluation of the cost and performance study. It was concluded that the LNS Burner retrofit would be a cost-effective option for control of cyclone boiler emissions. A full-scale demonstration of the LNS Burner retrofit was selected in October 1988 as part of the DOE`s Clean Coal Technology Program Round II.

  5. Cko.efer f. (i.f\\~f':tn\\ltt E'~~CS'\\'~ A~\\ !f~ \\fb a... 'T":~4.r.-t..

    E-Print Network [OSTI]

    Li, Kin-Yin

    QC~-®! Cko.efer f. (i.f\\~f':tn\\ltt E'~~CS'\\'~ A~\\ !f~ \\fb a... 'T":~4.r.-t.. ~c-l.;~. ~e...CA weo

  6. Search for Sneutrino Production in e? Final States in 5.3??fb(?1) of pp-bar Collisions at s?=1.96??TeV

    E-Print Network [OSTI]

    Baringer, Philip S.; Bean, Alice; Clutter, Justace Randall; McGivern, Carrie Lynne; Sekaric, Jadranka; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.

    2010-11-05

    We report the results of a search for R parity violating (RPV) interactions leading to the production of supersymmetric sneutrinos decaying into e? final states using 5.3??fb(?1) of integrated luminosity collected by the ...

  7. Active flow control in an advanced serpentine jet engine inlet duct 

    E-Print Network [OSTI]

    Kirk, Aaron Michael

    2009-05-15

    . This advantage is particularly important in unmanned aerial vehicles (UAV?s). A scaling analysis performed by engineers at Lockheed Martin showed that reducing duct length by one duct diameter can decrease the empty weight of UAV?s by 15%1. In typical... on this plumbing could be very difficult. A team of researchers at North Carolina State University designed a bleed air system that added approximately 3% to the empty weight of a scaled UAV designed by NASA and 10 Lockheed Martin17. To cool the bleed air...

  8. Electric coheating as a means to test duct efficiency: A review and analysis of the literature

    SciTech Connect (OSTI)

    Andrews, J.W.

    1995-08-01

    Recent published literature on electric coheating was reviewed in order to assess its suitability for use in a method of test for the efficiency of residential duct systems. Electric coheating is the research use of electric heaters within the heated space to assess the thermal integrity of the building envelope. Information was sought in two primary areas: (1) experimental methodology and (2) accuracy of the coheating method. A variety of experimental variations was found, and the method was judged, on the basis of published data, to be capable of sufficient accuracy for use in duct testing.

  9. Scaleup tests and supporting research for the development of duct injection technology

    SciTech Connect (OSTI)

    Gooch, J.P.; Dismukes, E.B.; Dahlin, R.S.; Faulkner, M.G. (Southern Research Inst., Birmingham, AL (United States)); Klett, M.G.; Buchanan, T.L.; Hunt, J.E. (Gilbert/Commonwealth, Inc., Reading, PA (United States))

    1989-05-01

    Gilbert Commonwealth, Southern Research Institute and the American Electric Power Service Corporation have embarked on a program to convert DOE's Duct Injection Test Facility located at the Muskingum River Power Plant of Ohio Power Company to test alternate duct injection technologies. The technologies to be tested include slurry sorbent injection of hydrated lime using dual fluid nozzles, or a rotary atomizer and pneumatic injection of hydrated lime, with flue gas humidification before or after sorbent injection. The literature review and analysis contained in this report is a part of the preparatory effort for the test program.

  10. 16th AIAA/CEAS Aeroacoustics Conference, 7-9 June 2010, Stockholm, Sweden Sound Radiation from a Lined Exhaust Duct

    E-Print Network [OSTI]

    Rienstra, Sjoerd W.

    a Lined Exhaust Duct with Lined Afterbody Ahmet Demir Department of Mathematics, Gebze Institute of Technology Aft fan noise radiating from a lined bypass exhaust duct with lined afterbody is modelled in a way AFT fan noise radiating from the bypass exhaust duct is usually attenuated by acoustic lining along

  11. 12th AIAA/CEAS Aeroacoustics Conference, 8-10 May 2006, Cambridge, MA, USA Sound Radiation from an Annular Duct with Jet Flow

    E-Print Network [OSTI]

    Eindhoven, Technische Universiteit

    an Annular Duct with Jet Flow and a Lined Centerbody A. Demir Eindhoven University of Technology, 5600 MB, The Netherlands. Analytical solutions for the problem of radiation of sound from a duct with flow have been shown of problem parameters and their combinations. I. Introduction THE problem of radiation of sound from a duct

  12. Formation and spread of callus tissue and tangential rows of resin ducts in Larix decidua and Picea abies following rockfall impacts

    E-Print Network [OSTI]

    Butler, David R. - Department of Geography, Texas State University

    Formation and spread of callus tissue and tangential rows of resin ducts in Larix decidua and Picea After mechanical wounding, callus tissue and tangential rows of traumatic resin ducts (TRDs) are formed extension, traumatic resin ducts. Introduction Rockfall is a common mass movement process in alpine

  13. Wireless RF Distribution in Buildings using Heating and Ventilation Ducts Christopher P. Diehl, Benjamin E. Henty, Nikhil Kanodia, and Daniel D. Stancil

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Wireless RF Distribution in Buildings using Heating and Ventilation Ducts Christopher P. Diehl in buildings is proposed in which the heating and ventilation ducts are used as waveguides. Because to a lower-cost system. Initial experimental results are presented that demonstrate duct-assisted propagation

  14. The Delta Q Method of Testing the Air Leakage of Ducts Walker, I.S., Dickerhoff, D.J. and Sherman, M.H.

    E-Print Network [OSTI]

    LBNL-49749 The Delta Q Method of Testing the Air Leakage of Ducts Walker, I.S., Dickerhoff, D in energy efficiency calculations and for compliance testing of duct systems. The DeltaQ test combines a model of the house and duct system with the results of house pressurization tests with the air handler

  15. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 51, NO. 5, MAY 2003 945 Propagation Model for the HVAC Duct as a

    E-Print Network [OSTI]

    Hannaford, Blake

    for the HVAC Duct as a Communication Channel Pavel V. Nikitin, Member, IEEE, Daniel D. Stancil, Senior Member (HVAC) ducts in buildings are typically hollow metal pipes which can be used as waveguides to carry such a communication system. This paper presents a propagation model for a straight HVAC duct terminated at both ends

  16. 11th AIAA/CEAS Aeroacoustics Conference, 23-25 May 2005, Monterey, CA, USA An Analytic Green's Function for a Lined Circular Duct

    E-Print Network [OSTI]

    Rienstra, Sjoerd W.

    's Function for a Lined Circular Duct Containing Uniform Mean Flow (corr.) Sjoerd W. Rienstra Eindhoven, Southampton S017 1BJ, UK. An analytic Green's function is derived for a lined circular duct, both hollow is not considered in the present study. We show that the analytic Green's function for a lined hollow circular duct

  17. 3D NUMERICAL STUDY OF MHD FLOW IN A RECTANGULAR DUCT WITH A FLOW CHANNEL INSERT Damien Sutevski, Sergey Smolentsev, Neil Morley, Mohamed Abdou

    E-Print Network [OSTI]

    Abdou, Mohamed

    3D NUMERICAL STUDY OF MHD FLOW IN A RECTANGULAR DUCT WITH A FLOW CHANNEL INSERT Damien Sutevski of magnetohydrodynamic (MHD) flows in poloidal ducts of the Dual-Coolant Lead-Lithium (DCLL) blanket with an insulating- conducting FCI. The FCI and duct geometry match those of an experiment performed recently in Southwestern

  18. In Proc. 1996 ACEEE Summer Study, August 1996, Asilomar, CA Field Measurements of Efficiency and Duct Retrofit Effectiveness in Residential Forced air

    E-Print Network [OSTI]

    of Efficiency and Duct Retrofit Effectiveness in Residential Forced air Distribution Systems David A. Jump, Iain. The systems in these houses included conventional air conditioning, gas furnaces, electric furnaces and heat, duct air temperatures, ambient temperatures, surface areas of ducts, and HVAC equipment energy

  19. Comparative Analysis of CFD ?P vs. Measured ?P for Compressed Flexible Ducts 

    E-Print Network [OSTI]

    Ugursal, A.; Culp, C.H.

    2007-01-01

    with permission of the copyright owner. Further reproduction prohibited without permission. Comparative Analysis of CFD [Delta]P vs. Measured [Delta]P for Compressed Flexible Ducts Ugursal, Ahmet;Culp, Charles ASHRAE Transactions; 2007; 113, ProQuest pg. 462...

  20. An Advanced Economizer Controller for Dual Duct Air Handling Systems - with a Case Application 

    E-Print Network [OSTI]

    Liu, M.; Claridge, D. E.

    1996-01-01

    Heating penalty is expected when economizers are applied to dual-duct air handling systems. The heating penalty can even be higher than the cooling savings when the hot air flow is higher than the cold air flow. To avoid the excessive heating...

  1. 96 ASHRAE Transactions: Research Current duct design methods for variable air volume

    E-Print Network [OSTI]

    -round electrical energy cost of the fan. The initial cost of the fan is not included. The calculation procedure to determine duct sizes, overall system pressure drop, and fan energy cost. However, in VAV systems for effective, energy-efficient, and comfortable heating, ventilat- ing, and air-conditioning (HVAC) systems

  2. Nonlinear self-excited thermoacoustic oscillations of a ducted premixed flame: bifurcations and routes to chaos

    E-Print Network [OSTI]

    Kashinath, Karthik; Waugh, Iain C.; Juniper, Matthew P.

    2014-11-25

    Thermoacoustic systems can oscillate self-excitedly, and often non-periodically, due to coupling between unsteady heat release and acoustic waves. We study a slot-stabilized two-dimensional premixed flame in a duct via numerical simulations of a G...

  3. 1 | Building America eere.energy.gov Evaluation of Ducted GE

    E-Print Network [OSTI]

    1 | Building America eere.energy.gov Evaluation of Ducted GE Hybrid Heat Pump Water Heater in PNNL Lab Homes Sarah Widder Building America Program Review April 24-25, 2013 #12;2 | Building America eere Technologies Program ­ DOE, Office of Electricity Project Partners #12;3 | Building America eere

  4. Global evaluation of mass transfer effects: In-duct injection flue gas desulfurization

    SciTech Connect (OSTI)

    Cole, J.A.; Newton, G.H.; Kramlich, J.C.; Payne, R.

    1990-09-30

    Sorbent injection is a low capital cost, low operating cost approach to SO{sub 2} control targeted primarily at older boilers for which conventional fuel gas desulfurization is not economically viable. Duct injection is one variation of this concept in which the sorbent, either a dry powder or a slurry, is injected into the cooler regions of the boiler, generally downstream of the air heaters. The attractiveness of duct injection is tied to the fact that it avoids much of the boiler heat transfer equipment and thus has minimal impact of boiler performance. Both capital and operating cost are low. This program has as its objectives three performance related issues to address: (1) experimentally identify limits on sorbent performance. (2) identify and test sorbent performance enhancement strategies. (3) develop a compute model of the duct injection process. Two major tasks are described: a laboratory-scale global experiment and development of process model. Both are aimed at understanding and quantifying the rate-limiting processes which control SO{sub 2} capture by lime slurry during boiler duct injection. 29 refs., 35 figs., 4 tabs.

  5. INTERNAL FORCED iquid or gas flow through pipes or ducts is commonly used in heating and

    E-Print Network [OSTI]

    Ghajar, Afshin J.

    to flow by a fan or pump through a flow section that is sufficiently long to accomplish the desired heat Transitional Flow in Tubes* An important design problem in industrial heat exchangers arises when flow inside or ducts is commonly used in heating and cooling applications. The fluid in such applications is forced

  6. Duct System Flammability and Air Sealing Fire Separation Assemblies in the International Residential Code

    SciTech Connect (OSTI)

    Rudd, A.; Prahl, D.

    2014-12-01

    IBACOS identified two barriers that limit the ability of builders to cost-effectively achieve higher energy efficiency levels in housing. These are (1) the use of duct system materials that inherently achieve airtightness and are appropriately sized for low-load houses and (2) the ability to air seal fire separation assemblies. The issues identified fall into a gray area of the codes.

  7. Duct System Flammability and Air Sealing Fire Separation Assemblies in the International Residential Code

    SciTech Connect (OSTI)

    Rudd, A.; Prahl, D.

    2014-12-01

    IBACOS identified two barriers that limit the ability of builders to cost-effectively achieve higher energy efficiency levels in housing. These are the use of duct system materials that inherently achieve airtightness and are appropriately sized for low-load houses and the ability to air seal fire separation assemblies. The issues identified fall into a gray area of the codes.

  8. The structural design of air and gas ducts for power stations and industrial boiler applications

    SciTech Connect (OSTI)

    Schneider, R.L.

    1996-10-01

    The purpose of this paper is to discuss the new American Society of Civil Engineers (ASCE) book entitled, The Structural Design of Air and Gas Ducts for Power Stations and Industrial Boiler Applications. This 312 page book was published by the ASCE in August of 1995. This ASCE publication was created to assist structural engineers in performing the structural analysis and design of air and flue-gas ducts. The structural behavior of steel ductwork can be difficult to understand for structural engineers inexperienced in ductwork analysis and design. Because of this needed expertise, the ASCE committee that created this document highly recommends that the structural analysis and design of ducts be performed by qualified structural engineers, not be technicians, designers or drafters. There is a history within the power industry of failures and major degradation of flue-gas ductwork. There are many reasons for these failures or degradation, but in many cases, the problems may have been voided by a better initial design. This book attempts to help the structural engineer with this task. This book is not intended to be used to size or configure ductwork for flow and pressure drop considerations. But it does recommend that the ductwork system arrangement consider the structural supports and the structural behavior of the duct system.

  9. Tracer Gas as a Practical Field Diagnostic Tool for Assessing Duct System Leaks 

    E-Print Network [OSTI]

    Cummings, J. B.

    1989-01-01

    diagnostic tools for detecting and locating leaks in the air distribution system. The tracer gas tests described are a good complement to these tools in the detection, location, and measurement of duct leakage. Testing for house infiltration once with the air...

  10. Low NO{sub x} combustion system with DSVS{trademark} rotating classifier retrofit for a 630 MW{sub e} cell burner unit

    SciTech Connect (OSTI)

    Bryk, S.A.; Maringo, G.J.; Shah, A.I. [Babcock and Wilcox, Barberton, OH (United States); Madden, V.F. [New England Power, Westborough, MA (United States)

    1996-12-31

    New England Power Company`s (NEP) 630 MW{sub e} Brayton Point Unit 3 is a universal pressure (UP) type supercritical boiler originally equipped with pulverized coal (PC) fired cell burners. In order to comply with the Phase 1 NO{sub x} emissions requirements under Title I of the 1990 Clean Air Act Amendments, the unit has been retrofitted with a low NO{sub x} staged combustion system during the spring 1995 outage. The unit was restarted in early May 1995 and was operating under the State Compliance emission levels by the end of the month. Additional optimization testing was performed in August, 1995. The retrofit scope consisted of replacing the cell burners with low NO{sub x} DRB-XCL{reg_sign} type PC/oil burners and overfire air ports within the existing open windbox, with no change in the firing pattern. A 70% NO{sub x} reduction from baseline levels was achieved while maintaining acceptable unburned carbon (UBC) and carbon monoxide (CO) emission levels. To maintain low UBC levels, the scope included modifying the MPS-89 pulverizers by replacing the existing stationary classifiers with the B and W DSVS{trademark} (Dynamically Staged Variable Speed) two stage rotating classifiers. The DSVS{trademark} classifiers provide higher fineness for UBC control without derating the mill capacity. This paper will describe the project and discuss the retrofit emissions data. The paper will conclude with recommendations for retrofitting other similarly designed units.

  11. Flame-synthesis limits and self-catalytic behavior of carbon nanotubes using a double-faced wall stagnation flow burner

    SciTech Connect (OSTI)

    Woo, S.K.; Hong, Y.T.; Kwon, O.C.

    2009-10-15

    Flame-synthesis limits of carbon nanotubes (CNTs) are measured using a double-faced wall stagnation flow (DWSF) burner that shows potential in mass production of CNTs. With nitrogen-diluted premixed ethylene-air flames established on the nickel-coated stainless steel double-faced plate wall, the limits of CNT formation are determined using field-emission scanning and transmission electron microscopies and Raman spectroscopy. Also, self-catalytic behavior of the synthesized CNTs is evaluated using the DWSF burner with a CNT-deposited stainless steel double-faced plate wall. Results show narrow fuel-equivalence ratio limits of multi-walled CNT (MWCNT)-synthesis at high flame stretch rates and substantially extended limits at low flame stretch rates. This implies that the synthesis limits are very sensitive to the fuel-equivalence ratio variation for the high stretch rate conditions, yielding a lot of impurities and soot rather than MWCNTs. The enhanced ratio of tube inner diameter to wall thickness of the MWCNTs synthesized using a CNT self-catalytic flame-synthesis process is observed, indicating that the quality of metal-catalytic, flame-synthesized MWCNTs can be much improved via the process. Thus, using a DWSF burner with the CNT self-catalytic process has potential in mass production of MWCNTs with improved quality. (author)

  12. Air-Side Energy Use Calculations for Four HVAC Systems: Dual Duct Constant Volume (DDCAV), Dual Duct Variable Volume (DDVAV), Constant Volume with Reheat (CAVRH), Variable Volume with Reheat (VAVRH), Four Pipe Fan Coil Unit (FC), Four Pipe Induction Unit (FI), and Single Zone (SZ) Systems, Revised June 2002 

    E-Print Network [OSTI]

    Haberl, J. S.; Bou-Saada, T. E.; Saman, N. F.

    2001-01-01

    This report contains engineering calculations for seven (7) air-side, heating, ventilating and air conditioning systems (HVAC) systems, including: dual duct constant volume (DDCAV), dual duct variable volume (DDVAV), ...

  13. Measurement of the W boson helicity in top quark decays using 5.4 fb?¹ of pp? collision data

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

    Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; et al

    2011-02-01

    We present a measurement of the helicity of the W boson produced in top quark decays using ttÆ decays in the l+jets and dilepton final states selected from a sample of 5.4 fb?¹ of collisions recorded using the D0 detector at the Fermilab Tevatron pp? collider. We measure the fractions of longitudinal and right-handed W bosons to be f?=0.669±0.102[±0.078(stat.)±0.065(syst.)] and f?=0.023±0.053[±0.041(stat.)±0.034(syst.)], respectively. This result is consistent at the 98% level with the standard model. A measurement with f? fixed to the value from the standard model yields f?=0.010±0.037[±0.022(stat.)±0.030(syst.)].

  14. Search for WH associated production in 5.3 fb -1 of ppÆ collisions at the Fermilab Tevatron

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

    Abazov, V.M.; Abbott, B.; Acharya, B.S.; Adams, M.; Adams, T.; Alexeev, G.D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G.A.; et al

    2011-03-01

    We present a search for associated production of Higgs and W bosons in collisions at a center of mass energy of in 5.3 fb -1 of integrated luminosity recorded by the D0 experiment. Multivariate analysis techniques are applied to events containing one lepton, an imbalance in transverse energy, and one or two b-tagged jets to discriminate a potential WH signal from Standard Model backgrounds. We observe good agreement between data and expected backgrounds, and set an upper limit of 4.5 (at 95% confidence level and for mH=115 GeV) on the ratio of the WH cross section multiplied by the branchingmore »fraction of H ? bbÆ to its Standard Model prediction, which is consistent with an expected limit of 4.8.« less

  15. Application of an ASHRAE 152-2004 Duct Model for Simulating Code-Compliant 2000/2001 IECC Residences 

    E-Print Network [OSTI]

    Haberl, J.S.; Kim, S.

    2010-01-01

    This paper presents the results of the application of the duct model based on ASHRAE 152-2004 - Method of Test for Determining the Design and Seasonal Efficiencies of Residential Thermal Distribution Systems (ASHRAE 2004) to the code compliant 2001...

  16. An Experimental Evaluation of Duct-Mounted Relative Humidity Sensors: Part 3 – Repeatability, Hysteresis and Linearity Results 

    E-Print Network [OSTI]

    Joshi, S.N.; Pate, M.B.; Nelson, R.M.; House, J.H.; Klaassen, C.J.

    2005-01-01

    Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. An Experimental Evaluation of Duct-Mounted Relative Humidity Sensors: Part 3-Repeatability, Hyste... Joshi, Shailesh N;House, John M...

  17. Evaluation of mixing downstream of tees in duct systems with respect to single point representative air sampling 

    E-Print Network [OSTI]

    Kim, Taehong

    2003-01-01

    Air duct systems in nuclear facilities must meet the requirements of ANSI N13.1-1999 and the Environmental Protection Agency (EPA) that the exhaust airflow be monitored with continuous sampling in case of an accidental release of airborne...

  18. Use of Statistical Approach to Design an Optimal Duct System for On-demand Industrial Exhaust Ventilation 

    E-Print Network [OSTI]

    Litomisky, A.

    2010-01-01

    This paper elaborates on how to use statistics to calculate optimal parameters (including duct diameters) of energy-efficient industrial ventilation systems. Based on the fan-law, on-demand ventilation can save up to 80% of electricity compared...

  19. Deterministic and stochastic algorithms for resolving the flow fields in ducts and networks using energy minimization

    E-Print Network [OSTI]

    Sochi, Taha

    2014-01-01

    Several deterministic and stochastic multi-variable global optimization algorithms (Conjugate Gradient, Nelder-Mead, Quasi-Newton, and Global) are investigated in conjunction with energy minimization principle to resolve the pressure and volumetric flow rate fields in single ducts and networks of interconnected ducts. The algorithms are tested with seven types of fluid: Newtonian, power law, Bingham, Herschel-Bulkley, Ellis, Ree-Eyring and Casson. The results obtained from all those algorithms for all these types of fluid agree very well with the analytically derived solutions as obtained from the traditional methods which are based on the conservation principles and fluid constitutive relations. The results confirm and generalize the findings of our previous investigations that the energy minimization principle is at the heart of the flow dynamics systems. The investigation also enriches the methods of Computational Fluid Dynamics for solving the flow fields in tubes and networks for various types of Newtoni...

  20. Real-time imaging of density ducts between the plasmasphere and ionosphere

    E-Print Network [OSTI]

    Loi, Shyeh Tjing; Cairns, Iver H; Menk, Frederick W; Waters, Colin L; Erickson, Philip J; Trott, Cathryn M; Hurley-Walker, Natasha; Morgan, John; Lenc, Emil; Offringa, Andre R; Bell, Martin E; Ekers, Ronald D; Gaensler, B M; Lonsdale, Colin J; Feng, Lu; Hancock, Paul J; Kaplan, David L; Bernardi, G; Bowman, J D; Briggs, F; Cappallo, R J; Deshpande, A A; Greenhill, L J; Hazelton, B J; Johnston-Hollitt, M; McWhirter, S R; Mitchell, D A; Morales, M F; Morgan, E; Oberoi, D; Ord, S M; Prabu, T; Shankar, N Udaya; Srivani, K S; Subrahmanyan, R; Tingay, S J; Wayth, R B; Webster, R L; Williams, A; Williams, C L

    2015-01-01

    Ionization of the Earth's atmosphere by sunlight forms a complex, multi-layered plasma environment within the Earth's magnetosphere, the innermost layers being the ionosphere and plasmasphere. The plasmasphere is believed to be embedded with cylindrical density structures (ducts) aligned along the Earth's magnetic field, but direct evidence for these remains scarce. Here we report the first direct wide-angle observation of an extensive array of field-aligned ducts bridging the upper ionosphere and inner plasmasphere, using a novel ground-based imaging technique. We establish their heights and motions by feature-tracking and parallax analysis. The structures are strikingly organized, appearing as regularly-spaced, alternating tubes of overdensities and underdensities strongly aligned with the Earth's magnetic field. These findings represent the first direct visual evidence for the existence of such structures.

  1. Technology Solutions Case Study: High-Performance Ducts in Hot-Dry Climates

    SciTech Connect (OSTI)

    M. Hoeschele, A. German, E. Weitzel, R. Chitwood

    2015-08-01

    Ducts in conditioned space (DCS) represent a high priority measure for moving the next generation of new homes to the Zero Net Energy performance level. Various strategies exist for incorporating ducts within the conditioned thermal envelope. To support this activity, in 2013 the Pacific Gas & Electric Company initiated a project with Davis Energy Group (lead for the Building America team, Alliance for Residential Building Innovation) to solicit builder involvement in California to participate in field demonstrations of various DCS strategies. Builders were given incentives and design support in exchange for providing site access for construction observation, diagnostic testing, and builder survey feedback. Information from the project was designed to feed into California's 2016 Title 24 process, but also to serve as an initial mechanism to engage builders in more high performance construction strategies. This Building America project complemented information collected in the California project with BEopt simulations of DCS performance in hot/dry climate regions.

  2. Single channel double-duct liquid metal electrical generator using a magnetohydrodynamic device

    DOE Patents [OSTI]

    Haaland, C.M.; Deeds, W.E.

    1999-07-13

    A single channel double-duct liquid metal electrical generator using a magnetohydrodynamic (MHD) device. The single channel device provides useful output AC electric energy. The generator includes a two-cylinder linear-piston engine which drives liquid metal in a single channel looped around one side of the MHD device to form a double-duct contra-flowing liquid metal MHD generator. A flow conduit network and drive mechanism are provided for moving liquid metal with an oscillating flow through a static magnetic field to produce useful AC electric energy at practical voltages and currents. Variable stroke is obtained by controlling the quantity of liquid metal in the channel. High efficiency is obtained over a wide range of frequency and power output. 5 figs.

  3. Single channel double-duct liquid metal electrical generator using a magnetohydrodynamic device

    DOE Patents [OSTI]

    Haaland, Carsten M. (Dadeville, AL); Deeds, W. Edward (Knoxville, TN)

    1999-01-01

    A single channel double-duct liquid metal electrical generator using a magnetohydrodynamic (MHD) device. The single channel device provides useful output AC electric energy. The generator includes a two-cylinder linear-piston engine which drives liquid metal in a single channel looped around one side of the MHD device to form a double-duct contra-flowing liquid metal MHD generator. A flow conduit network and drive mechanism are provided for moving liquid metal with an oscillating flow through a static magnetic field to produce useful AC electric energy at practical voltages and currents. Variable stroke is obtained by controlling the quantity of liquid metal in the channel. High efficiency is obtained over a wide range of frequency and power output.

  4. Reducing Thermal Losses and Gains With Buried and Encapsulated Ducts in Hot-Humid Climates

    SciTech Connect (OSTI)

    Shapiro, C.; Magee, A.; Zoeller, W.

    2013-02-01

    The Consortium for Advanced Residential Buildings (CARB) monitored three houses in Jacksonville, FL, to investigate the effectiveness of encapsulated and encapsulated/buried ducts in reducing thermal losses and gains from ductwork in unconditioned attics. Burying ductwork beneath loose-fill insulation has been identified as an effective method of reducing thermal losses and gains from ductwork in dry climates, but it is not applicable in humid climates where condensation may occur on the outside of the duct jacket. By encapsulating the ductwork in closed cell polyurethane foam (ccSPF) before burial beneath loose-fill mineral fiber insulation, the condensation potential may be reduced while increasing the R-value of the ductwork.

  5. Travelling-waves consistent with turbulence-driven secondary flow in a square duct

    E-Print Network [OSTI]

    Uhlmann, Markus; Pinelli, Alfredo; 10.1063/1.3466661

    2010-01-01

    We present numerically determined travelling-wave solutions for pressure-driven flow through a straight duct with a square cross-section. This family of solutions represents typical coherent structures (a staggered array of counter-rotating streamwise vortices and an associated low-speed streak) on each wall. Their streamwise average flow in the cross-sectional plane corresponds to an eight vortex pattern much alike the secondary flow found in the turbulent regime.

  6. Simulations of Detonation Wave Propagation in Rectangular Ducts Using a Three-Dimensional WENO Scheme

    E-Print Network [OSTI]

    Dou, Hua-Shu; Khoo, Boo Cheong; Qiu, Jianxian

    2010-01-01

    This paper reports high resolution simulations using a fifth-order weighted essentially non-oscillatory (WENO) scheme with a third order TVD Runge-Kutta time stepping method to examine the features of detonation front and physics in square ducts. The simulations suggest that two and three-dimensional detonation wave front formations are greatly enhanced by the presence of transverse waves. The motion of transverse waves generates triple points (zones of high pressure and large velocity coupled together), which cause the detonation front to become locally overdriven and thus form "hot spots". The transversal motion of these hot spots maintains the detonation to continuously occur along the whole front in two and three-dimensions. The present simulations indicate that the influence of the transverse waves on detonation is more profound in three dimensions and the pattern of quasi-steady detonation fronts also depends on the duct size. For a narrow duct (4LX4L where L is the half reaction length), the detonation...

  7. Ducts Sealing Using Injected Spray Sealant, Raleigh, North Carolina (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-03-01

    In multifamily and attached buildings, traditional duct sealing methods are often impractical or costly and disruptive because of the difficulty in accessing leakage sites. In this project, two retrofit duct sealing techniques - manually-applied sealants and injecting a spray sealant, were implemented in several low-rise multi-unit buildings. An analysis on the cost and performance of the two methods are presented. Each method was used in twenty housing units: approximately half of each group of units are single story and the remainder two-story. Results show that duct leakage to the outside was reduced by an average of 59% through the use of manual methods, and by 90% in the units where the injected spray sealant was used. It was found that 73% of the leakage reduction in homes that were treated with injected spray sealant was attributable to the manual sealing done at boots, returns and the air handler. The cost of manually-applying sealant ranged from $275 to $511 per unit and for the injected spray sealant the cost was $700 per unit. Modeling suggests a simple payback of 2.2 years for manual sealing and 4.7 years for the injected spray sealant system. Utility bills were collected for one year before and after the retrofits. Utility bill analysis shows 14% and 16% energy savings using injected spray sealant system and hand sealing procedure respectively in heating season whereas in cooling season, energy savings using injected spray sealant system and hand sealing were both 16%.

  8. ENERGY ECONOMY CII5fB 81 (R3) (L2) (M2) UDC 728.3 (489) Low-energy houses

    E-Print Network [OSTI]

    solutions as to design, choice of building materials, heating systems, energy sources, etc. (ref. 1). EachENERGY ECONOMY CII5fB 81 (R3) (L2) (M2) UDC 728.3 (489) Low-energy houses: insulation and air tightness by Bjarne Saxhof and Allan A. Nielsen 142 The Hjortekar project of six low energy house designs

  9. Achieving New Source Performance Standards (NSPS) Emission Standards Through Integration of Low-NOx Burners with an Optimization Plan for Boiler Combustion

    SciTech Connect (OSTI)

    Wayne Penrod

    2006-12-31

    The objective of this project was to demonstrate the use of an Integrated Combustion Optimization System to achieve NO{sub X} emission levels in the range of 0.15 to 0.22 lb/MMBtu while simultaneously enabling increased power output. The project plan consisted of the integration of low-NO{sub X} burners and advanced overfire air technology with various process measurement and control devices on the Holcomb Station Unit 1 boiler. The plan included the use of sophisticated neural networks or other artificial intelligence technologies and complex software to optimize several operating parameters, including NO{sub X} emissions, boiler efficiency, and CO emissions. The program was set up in three phases. In Phase I, the boiler was equipped with sensors that can be used to monitor furnace conditions and coal flow to permit improvements in boiler operation. In Phase II, the boiler was equipped with burner modifications designed to reduce NO{sub X} emissions and automated coal flow dampers to permit on-line fuel balancing. In Phase III, the boiler was to be equipped with an overfire air system to permit deep reductions in NO{sub X} emissions. Integration of the overfire air system with the improvements made in Phases I and II would permit optimization of boiler performance, output, and emissions. This report summarizes the overall results from Phases I and II of the project. A significant amount of data was collected from the combustion sensors, coal flow monitoring equipment, and other existing boiler instrumentation to monitor performance of the burner modifications and the coal flow balancing equipment.

  10. DEVELOPMENT OF A NOVEL RADIATIVELY/CONDUCTIVELY STABILIZED BURNER FOR SIGNIFICANT REDUCTION OF NOx EMISSIONS AND FOR ADVANCING THE MODELING AND UNDERSTANDING OF PULVERIZED COAL COMBUSTION AND EMISSIONS

    SciTech Connect (OSTI)

    Noam Lior; Stuart W. Churchill

    2003-10-01

    The primary objective of the proposed study was the study and analysis of, and design recommendations for, a novel radiatively-conductively stabilized combustion (RCSC) process for pulverized coal, which, based on our prior studies with both fluid fuels and pulverized coal, holds a high promise to reduce NO{sub x} production significantly. We have primarily engaged in continuing and improving our process modeling and analysis, obtained a large amount of quantitative information about the effects of the major parameters on NO{sub x} production, conducted an extensive exergy analysis of the process, evaluated the practicalities of employing the Radiatively-Conductively Stabilized Combustor (RCSC) to large power and heat plants, and improved the experimental facility. Prior experimental work has proven the feasibility of the combustor, but slagging during coal combustion was observed and should be dealt with. The primary outcomes and conclusions from the study are: (1) we developed a model and computer program that represents the pulverized coal combustion in the RCSC, (2) the model predicts that NO{sub x} emissions can be reduced by a number of methods, detailed in the report. (3) the exergy analysis points out at least a couple of possible ways to improve the exergetic efficiency in this combustor: increasing the effectiveness of thermal feedback, and adjusting the combustor mixture exit location, (4) because of the low coal flow rates necessitated in this study to obtain complete combustion in the burner, the size of a burner operating under the considered conditions would have to be up to an order of magnitude, larger than comparable commercial burners, but different flow configurations of the RCSC can yield higher feed rates and smaller dimensions, and should be investigated. Related to this contract, eleven papers were published in journals and conference proceedings, and ten invited presentations were given at university and research institutions, as well as at the Gordon Conference on Modern Development in Thermodynamics. The results obtained are very encouraging for the development of the RCSC as a commercial burner for significant reduction of NO{sub x} emissions, and highly warrants further study and development.

  11. Energy Savings and Peak Demand Reduction of a SEER 21 Heat Pump vs. a SEER 13 Heat Pump with Attic and Indoor Duct Systems

    SciTech Connect (OSTI)

    Cummings, J.

    2014-03-01

    This report describes results of experiments that were conducted in an unoccupied 1600 square foot house--the Manufactured Housing (MH Lab) at the Florida Solar Energy Center (FSEC)--to evaluate the delivered performance as well as the relative performance of a SEER 21 variable capacity heat pump versus a SEER 13 heat pump. The performance was evaluated with two different duct systems: a standard attic duct system and an indoor duct system located in a dropped-ceiling space.

  12. Combined search for the Standard Model Higgs boson using up to 4.9 fb[superscript ?1] of pp collision data at ?s = 7 TeV with the ATLAS detector at the LHC

    E-Print Network [OSTI]

    Taylor, Frank E.

    A combined search for the Standard Model Higgs boson with the ATLAS experiment at the LHC using datasets corresponding to integrated luminosities from 1.04 fb[superscript ?1] to 4.9 fb[superscript ?1] of pp collisions ...

  13. Building America Case Study: Raised Ceiling Interior Duct System, New Smyrna, Florida (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-09-01

    One of BA-PIRC's longtime Habitat for Humanity partners, S.E. Volusia CO (SEVHFH), was interested in building a home to the new Challenge Home standards. SEVHFH routinely builds ENERGY STAR V3.1 homes. The only modification to their design needed to comply with the Challenge Home criteria was the interior duct requirement. Unwilling to incur the added costs of a foam roof deck or wall heights above 8 feet to accommodate a fur-down chase SEVHFH opted to build a fur-up or raised ceiling chase.

  14. An advanced economizer controller for dual-duct air-handling systems -- with a case application

    SciTech Connect (OSTI)

    Liu, M.; Claridge, D.E.; Park, B.Y.

    1997-12-31

    A heating penalty is expected when economizers are applied to dual-duct air-handling systems. The heating penalty can be even higher than the cooling savings when the hot airflow is higher than the cold airflow. To avoid the excessive heating penalty, advanced economizers are developed in this paper. The application of the advanced economizer has resulted in savings of $7,000/yr in one 95,000-ft{sup 2} (8,800-m{sup 2}) school building since 1993. The impacts of cold and hot deck settings on the energy consumption are also discussed.

  15. Measurement of flowfield in a simulated solid-propellant ducted rocket combustor using laser Doppler velocimetry

    SciTech Connect (OSTI)

    Hsieh, W.H.; Yang, V.; Chuang, C.L.; Yang, A.S.; Cherng, D.L.

    1989-01-01

    A two-component LDV system was used to obtain detailed flow velocity and turbulence measurements in order to study the flow characteristics in a simulated solid-propellant ducted rocket combustor. The vortical structures near the dome region, the size of the recirculation zone, and the location of the reattachment point are all shown to be strongly affected by the jet momentum of both ram air and fuel streams. It is found that the turbulence intensity is anisotropic throughout the front portion of the simulated conbustor, and that the measured Reynolds stress conmponent distribution is well correlated with the local mean velocity vector distribution. 25 refs.

  16. Nitrogen and hydrogen CARS temperature measurements in a hydrogen/air flame using a near-adiabatic flat-flame burner

    SciTech Connect (OSTI)

    Hancock, R.D.; Bertagnolli, K.E.; Lucht, R.P.

    1997-05-01

    Coherent anti-Stokes Raman scattering (CARS) spectroscopy of diatomic nitrogen and hydrogen was used to measure flame temperatures in hydrogen/air flames produced using a nonpremixed, near-adiabatic, flat-flame Hencken burner. The CARS temperature measurements are compared with adiabatic flame temperatures calculated by the NASA-Lewis equilibrium code for equivalence ratios from 0.5--2.5. The nitrogen CARS temperatures are in excellent agreement with the equilibrium code calculations. Comparison of nitrogen CARS data and the equilibrium code calculations confirms that for sufficiently high flow rates the Hencken burner produces nearly adiabatic flames. Hydrogen CARS temperature measurements are compared to both nitrogen CARS temperature measurements and equilibrium code predictions in order to evaluate and improve the accuracy of hydrogen CARS as a temperature diagnostic tool. Hydrogen CARS temperatures for fuel-rich flames are on average 70 K ({approximately}3%) above the equilibrium code predictions and nitrogen CARS temperatures. The difference between temperatures measured using hydrogen and nitrogen CARS is probably due primarily to uncertainties in hydrogen linewidths and line-broadening mechanisms at these conditions.

  17. Experimental and numerical study of the accuracy of flame-speed measurements for methane/air combustion in a slot burner

    SciTech Connect (OSTI)

    Selle, L.; Ferret, B. [Universite de Toulouse, INPT, UPS, IMFT, Institut de Mecanique des Fluides de Toulouse (France); CNRS, IMFT, Toulouse (France); Poinsot, T. [Universite de Toulouse, INPT, UPS, IMFT, Institut de Mecanique des Fluides de Toulouse (France); CNRS, IMFT, Toulouse (France); CERFACS, Toulouse (France)

    2011-01-15

    Measuring the velocities of premixed laminar flames with precision remains a controversial issue in the combustion community. This paper studies the accuracy of such measurements in two-dimensional slot burners and shows that while methane/air flame speeds can be measured with reasonable accuracy, the method may lack precision for other mixtures such as hydrogen/air. Curvature at the flame tip, strain on the flame sides and local quenching at the flame base can modify local flame speeds and require corrections which are studied using two-dimensional DNS. Numerical simulations also provide stretch, displacement and consumption flame speeds along the flame front. For methane/air flames, DNS show that the local stretch remains small so that the local consumption speed is very close to the unstretched premixed flame speed. The only correction needed to correctly predict flame speeds in this case is due to the finite aspect ratio of the slot used to inject the premixed gases which induces a flow acceleration in the measurement region (this correction can be evaluated from velocity measurement in the slot section or from an analytical solution). The method is applied to methane/air flames with and without water addition and results are compared to experimental data found in the literature. The paper then discusses the limitations of the slot-burner method to measure flame speeds for other mixtures and shows that it is not well adapted to mixtures with a Lewis number far from unity, such as hydrogen/air flames. (author)

  18. Whistler wave radiation from a pulsed loop antenna located in a cylindrical duct with enhanced plasma density

    SciTech Connect (OSTI)

    Kudrin, Alexander V.; Shkokova, Natalya M.; Ferencz, Orsolya E.; Zaboronkova, Tatyana M.

    2014-11-15

    Pulsed radiation from a loop antenna located in a cylindrical duct with enhanced plasma density is studied. The radiated energy and its distribution over the spatial and frequency spectra of the excited waves are derived and analyzed as functions of the antenna and duct parameters. Numerical results referring to the case where the frequency spectrum of the antenna current is concentrated in the whistler range are reported. It is shown that under ionospheric conditions, the presence of an artificial duct with enhanced density can lead to a significant increase in the energy radiated from a pulsed loop antenna compared with the case where the same source is immersed in the surrounding uniform magnetoplasma. The results obtained can be useful in planning active ionospheric experiments with pulsed electromagnetic sources operated in the presence of artificial field-aligned plasma density irregularities that are capable of guiding whistler waves.

  19. Combined CDF and D0 Searches for the Standard Model Higgs Boson Decaying to Two Photons with up to 8.2 fb^-1

    E-Print Network [OSTI]

    The CDF Collaboration; the D0 Collaboration; the Tevatron New Physics; Higgs Working Group

    2011-07-25

    We combine results from CDF and D0's direct searches for the standard model (SM) Higgs boson (H) produced in ppbar collisions at the Fermilab Tevatron at sqrt{s}=1.96 TeV, focusing on the decay H\\rightarrow\\gamma\\gamma. We compute upper limits on the Higgs boson production cross section times the decay branching fraction in the range 100Higgs boson. With datasets corresponding to 7.0 fb-1 (CDF) and 8.2 fb-1 (D0), the 95% C.L. upper limits on Higgs boson production is a factor of 10.5 times the SM cross section for a Higgs boson mass of 115 GeV/c^2.

  20. Dark matter burners

    E-Print Network [OSTI]

    Moskalenko, I V

    2006-01-01

    We show that a star orbiting close enough to an adiabatically grown supermassive black hole can capture a large number of weakly interacting massive particles (WIMPs) during its lifetime. WIMP annihilation energy release in low- to medium-mass stars is comparable with or even exceeds the luminosity of such stars due to thermonuclear burning. The excessive energy release in the stellar core may result in an evolution scenario different from what is expected for a regular star. The model thus predicts the existence of unusual stars within the central parsec of galactic nuclei. If found, such stars would provide evidence for the existence of particle dark matter. The excess luminosity of such stars attributed to WIMP "burning" can be used to infer the local WIMP matter density. A white dwarf with a highly eccentric orbit around the central black hole may exhibit variations in brightness correlated with the orbital phase. On the other hand, white dwarfs shown to lack such orbital brightness variations can be used...

  1. Linear stability of magnetohydrodynamic flow in a square duct with thin conducting walls

    E-Print Network [OSTI]

    Priede, J?nis; Bühler, Leo

    2015-01-01

    This study is concerned with numerical linear stability analysis of liquid metal flow in a square duct with thin electrically conducting walls subject to a uniform transverse magnetic field. We derive an asymptotic solution for the base flow which is valid not only for high but also moderate magnetic fields. This solution shows that for low wall conductance ratios $c\\ll1,$ an extremely strong magnetic field with the Hartmann number $Ha\\sim c^{-4}$ is required to attain the asymptotic flow regime considered in the previous studies. We use a vector stream function/vorticity formulation and a Chebyshev collocation method to solve the eigenvalue problem for three-dimensional small-amplitude perturbations in ducts with realistic wall conductance ratios $c=1,0.1,0.01$ and Hartmann numbers up to $10^{4}.$ As for similar flows, instability in a sufficiently strong magnetic field is found to occur in the side-wall jets with the characteristic thickness $\\delta\\sim Ha^{-1/2}.$ This results in the critical Reynolds numb...

  2. Linear stability of magnetohydrodynamic flow in a perfectly conducting rectangular duct

    E-Print Network [OSTI]

    Priede, J?nis; Molokov, Sergei

    2011-01-01

    We analyse numerically the linear stability of a liquid metal flow in a rectangular duct with perfectly electrically conducting walls subject to a uniform transverse magnetic field. A vector stream function formulation is used with Chebyshev collocation method to solve the eigenvalue problem for small-amplitude perturbations. A relatively weak magnetic field is found to render the flow linearly unstable as two weak jets appear close to the centre of the duct at the Hartmann number Ha \\approx 9.6. In a sufficiently strong magnetic field, the instability following the jets becomes confined in the layers of characteristic thickness \\delta \\sim Ha^{-1/2} located at the walls parallel to the magnetic field. In this case the instability is determined by \\delta, which results in both the critical Reynolds and wavenumbers numbers scaling as \\sim \\delta^{-1}. Instability modes can have one of the four different symmetry combinations along and across the magnetic field. The most unstable is a pair of modes with an even...

  3. Laminar and transitional liquid metal duct flow near a magnetic point dipole

    E-Print Network [OSTI]

    Tympel, Saskia; Schumacher, Jörg

    2013-01-01

    The flow transformation and the generation of vortex structures by a strong magnetic dipole field in a liquid metal duct flow is studied by means of three-dimensional direct numerical simulations. The dipole is considered as the paradigm for a magnetic obstacle which will deviate the streamlines due to Lorentz forces acting on the fluid elements. The duct is of square cross-section. The dipole is located above the top wall and is centered in spanwise direction. Our model uses the quasi-static approximation which is applicable in the limit of small magnetic Reynolds numbers. The analysis covers the stationary flow regime at small hydrodynamic Reynolds numbers $Re$ as well as the transitional time-dependent regime at higher values which may generate a turbulent flow in the wake of the magnetic obstacle. We present a systematic study of these two basic flow regimes and their dependence on $Re$ and on the Hartmann number $Ha$, a measure of the strength of the magnetic dipole field. Furthermore, three orientations...

  4. Establishment of three-dimensional cultures of human pancreatic duct epithelial cells

    SciTech Connect (OSTI)

    Gutierrez-Barrera, Angelica M. [Department of Gastrointestinal Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Unit 426, 1515 Holcombe Boulevard, Houston, TX 77030 (United States); Menter, David G. [Department of Thoracic Head and Neck Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX (United States); Abbruzzese, James L. [Department of Gastrointestinal Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Unit 426, 1515 Holcombe Boulevard, Houston, TX 77030 (United States); Reddy, Shrikanth A.G. [Department of Gastrointestinal Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Unit 426, 1515 Holcombe Boulevard, Houston, TX 77030 (United States)]. E-mail: sa08366@wotan.mdacc.tmc.edu

    2007-07-06

    Three-dimensional (3D) cultures of epithelial cells offer singular advantages for studies of morphogenesis or the role of cancer genes in oncogenesis. In this study, as part of establishing a 3D culture system of pancreatic duct epithelial cells, we compared human pancreatic duct epithelial cells (HPDE-E6E7) with pancreatic cancer cell lines. Our results show, that in contrast to cancer cells, HPDE-E6E7 organized into spheroids with what appeared to be apical and basal membranes and a luminal space. Immunostaining experiments indicated that protein kinase Akt was phosphorylated (Ser473) and CTMP, a negative Akt regulator, was expressed in both HPDE-E6E7 and cancer cells. However, a nuclear pool of CTMP was detectable in HPDE-E6E7 cells that showed a dynamic concentrated expression pattern, a feature that further distinguished HPDE-E637 cells from cancer cells. Collectively, these data suggest that 3D cultures of HPDE-E6E7 cells are useful for investigating signaling and morphological abnormalities in pancreatic cancer cells.

  5. Scaleup tests and supporting research for the development of duct injection technology

    SciTech Connect (OSTI)

    Felix, L.G.; Dismukes, E.B.; Gooch, J.P. (Southern Research Inst., Birmingham, AL (United States)); Klett, M.G.; Demian, A.G. (Gilbert/Commonwealth, Inc., Reading, PA (United States))

    1992-04-20

    This Topical Report No. 2 is an interim report on the Duct Injection Test Facility being operated for the Department of Energy at Beverly, Ohio. Either dry calcium hydroxide or an aqueous slurry of calcium hydroxide (prepared by slaking quicklime) is injected into a slipstream of flue gas to achieve partial removal of SO{sub 2} from a coal-burning power station. Water injected with the slurry or injected separately from the dry sorbents cools the flue gas and increases the water vapor content of the gas. The addition of water, either in the slurry or in a separate spray, makes the extent of reaction between the sorbent and the SO{sub 2} more complete; the presumption is that water is effective in the liquid state, when it is able to wet the sorbent particles physically, and not especially effective in the vapor state. An electrostatic precipitator collects the combination of suspended solids (fly ash from the boiler and sorbent from the duct injection process). All of the operations are being carried out on the scale of approximately 50,000 acfm of flue gas.

  6. Search for New Heavy Resonances Decaying To t+t^- Pairs at the LHC with Square Root S= 7 TEV (L = 5.0 FB^-1) 

    E-Print Network [OSTI]

    Suarez, Indara

    2015-01-22

    for Heavy Resonances . . . . . . . . . . . . . . . . 17 3. THE LARGE HADRON COLLIDER AND THE CMS DETECTOR . . . 21 3.1 The Large Hadron Collider . . . . . . . . . . . . . . . . . . . . . . . . 21 3.2 The Compact Muon Solenoid Detector...V center-of-mass energy to the CMS detector. CMS recorded 5.55 fb?1 of data. . . . . . . . . . . 23 3.3 Cross-sectional View of the CMS Detector. The subdetectors in or- der from the interaction point outward are the pixel detector, the sili- con tracker...

  7. Scaleup tests and supporting research for the development of duct injection technology. Topical report No. 1, Literature review

    SciTech Connect (OSTI)

    Gooch, J.P.; Dismukes, E.B.; Dahlin, R.S.; Faulkner, M.G. [Southern Research Inst., Birmingham, AL (United States); Klett, M.G.; Buchanan, T.L.; Hunt, J.E. [Gilbert/Commonwealth, Inc., Reading, PA (United States)

    1989-05-01

    Gilbert Commonwealth, Southern Research Institute and the American Electric Power Service Corporation have embarked on a program to convert DOE`s Duct Injection Test Facility located at the Muskingum River Power Plant of Ohio Power Company to test alternate duct injection technologies. The technologies to be tested include slurry sorbent injection of hydrated lime using dual fluid nozzles, or a rotary atomizer and pneumatic injection of hydrated lime, with flue gas humidification before or after sorbent injection. The literature review and analysis contained in this report is a part of the preparatory effort for the test program.

  8. Proceedings of the 32nd ISR(International Symposium on Robotics), 19-21 April 2001 Climbing Service Robot for Duct Inspection and Maintenance Applications in a

    E-Print Network [OSTI]

    Chen, Sheng

    Robot for Duct Inspection and Maintenance Applications in a Nuclear Reactor B.L. Luk1 , T.S. White2 , D to perform non-destructive testing of various welds on the main reactor cooling gas ducts at Sizewell 'A of the frames, and pneumatic cylinders for compliant leg control. Vacuum grippers are used for climbing vertical

  9. Duct Leakage Modeling in EnergyPlus and Analysis of Energy Savings from Implementing SAV with InCITeTM

    SciTech Connect (OSTI)

    Wray, Craig; Sherman, Max

    2010-03-01

    This project addressed two significant deficiencies in air-handling systems for large commercial building: duct leakage and duct static pressure reset. Both constitute significant energy reduction opportunities for these buildings. The overall project goal is to bridge the gaps in current duct performance modeling capabilities, and to expand our understanding of air-handling system performance in California large commercial buildings. The purpose of this project is to provide technical support for the implementation of a duct leakage modeling capability in EnergyPlus, to demonstrate the capabilities of the new model, and to carry out analyses of field measurements intended to demonstrate the energy saving potential of the SAV with InCITeTM duct static pressure reset (SPR) technology. A new duct leakage model has been successfully implemented in EnergyPlus, which will enable simulation users to assess the impacts of leakage on whole-building energy use and operation in a coupled manner. This feature also provides a foundation to support code change proposals and compliance analyses related to Title 24 where duct leakage is an issue. Our example simulations continue to show that leaky ducts substantially increase fan power: 10percent upstream and 10percent downstream leakage increases supply fan power 30percent on average compared to a tight duct system (2.5percent upstream and 2.5percent downstream leakage). Much of this increase is related to the upstream leakage rather than to the downstream leakage. This does not mean, however, that downstream leakage is unimportant. Our simulations also demonstrate that ceiling heat transfer is a significant effect that needs to be included when assessing the impacts of duct leakage in large commercial buildings. This is not particularly surprising, given that ?ceiling regain? issues have already been included in residential analyses as long as a decade ago (e.g., ASHRAE Standard 152); mainstream simulation programs that are used for large commercial building energy analyses have not had this capability until now. Our analyses of data that we collected during our 2005 tests of the SAV with InCITeTM duct static pressure reset technology show that this technology can substantially reduce fan power (in this case, by about 25 to 30percent). Tempering this assessment, however, is that cooling and heating coil loads were observed to increase or decrease significantly depending on the time window used. Their impact on cooling and heating plant power needs to be addressed in future studies; without translating the coil loads to plant equipment energy use, it is not possible to judge the net impact of this SPR technology on whole-building energy use. If all of the loads had decreased, such a step would not be as necessary.

  10. Search for Randall-Sundrum Gravitons in Dilepton and Diphoton Final States with 1 fb-1 of Data

    SciTech Connect (OSTI)

    Das, Amitabha; /Boston U.

    2007-05-01

    The work presented in this thesis is the search for Randall-Sundrum (RS) gravitons from an analysis of approximately 1 fb{sup -1} data collected with the D0 detector at Fermilab. The standard model has been a great success in explaining all experimental observations in particle physics. However, we also know that it has fundamental problems. One of these problems, called the hierarchy problem, is related to the large difference between the electroweak scale and the Planck scale. The model proposed by Randall and Sundrum presents a possible solution to the hierarchy problem by introducing physics beyond the standard model. Randall and Sundrum's theory postulates the existence of a 4th spatial dimension in addition to the conventional (3+1)-dimensional space. Gravity is localized on a 3+1 dimensional subspace, called a brane (Planck brane) that is separated in this new 4th spatial dimension from the standard model brane. As one moves away from this Planck brane, gravity is exponentially suppressed and this explains why gravity appears so weak at the standard model brane. In the simplest RS model, the only particles that propagate in the extra dimension are gravitons. The graviton manifests itself on the standard model brane as a series of excited states that couple to standard model particles with similar strength as the electroweak interaction. The ground state is the massless graviton and the order of magnitude of the mass of the lowest excited state is expected to be one TeV. The first excited mode of the graviton might be produced resonantly at the Tevatron. Gravitons can decay into fermion-antifermion or diboson pairs. Here I search for gravitons through their decay to e{sup +}e{sup -} and {gamma}{gamma} final states. These final states have similar signatures in our detector and can thus be treated together. After analyzing the data I do not find any excess over standard model expectations and set an upper limit on the production rate of such gravitons. I compare this limit to the production rate predicted by the theory for a range of possible couplings and set mass limits on the lowest excited gravitons state of up to 898 GeV.

  11. Titanium subhydride potassium perchlorate (TiH1.65/KClO4) burn rates from hybrid closed bomb-strand burner experiments.

    SciTech Connect (OSTI)

    Cooper, Marcia A.; Oliver, Michael S.

    2012-08-01

    A hybrid closed bomb-strand burner is used to measure the burning behavior of the titanium subhydride potassium perchlorate pyrotechnic with an equivalent hydrogen concentration of 1.65. This experimental facility allows for simultaneous measurement of the closed bomb pressure rise and pyrotechnic burn rate as detected by electrical break wires over a range of pressures. Strands were formed by pressing the pyrotechnic powders to bulk densities between 60% and 90% theoretical maximum density. The burn rate dependance on initial density and vessel pressure are measured. At all initial strand densities, the burn is observed to transition from conductive to convective burning within the strand. The measured vessel pressure history is further analyzed following the closed bomb analysis methods developed for solid propellants.

  12. Procedure and Application for Determining the Cold Deck and Hot Deck Airflow in a Dual-Duct System 

    E-Print Network [OSTI]

    Liu, G.; Mingsheng, L.

    2006-01-01

    This paper introduces an innovative method to determine the cold and hot airflow through a dual-duct variable air volume (VAV) system. The actual building load can be identified based on the calculated airflow and temperature for both the cold...

  13. Osmotic Stress Regulates Mineralocorticoid Receptor Expression in a Novel Aldosterone-Sensitive Cortical Collecting Duct Cell Line

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Osmotic Stress Regulates Mineralocorticoid Receptor Expression in a Novel Aldosterone 49 59 67 32; E-mail: marc.lombes@u-psud.fr Abbreviated Title: Osmotic Stress and MR Expression Precis: Osmotic Stress Regulates Mineralocorticoid Receptor Expression in Cortical Collecting Duct Cells

  14. Longevity of Duct Tape in Residential Air Distribution Systems: 1-D, 2-D, and 3-D Joints 

    E-Print Network [OSTI]

    Abushakra, B.

    2003-01-01

    . The study concluded that the duct tape performance in sealing joints depends on the joint's space dimensions; it gets worse as the number of dimensions required to describe the joint increases (1-D to 3-D). This is essentially caused by the shrinkage...

  15. FDR for non destructive evaluation: inspection of external post-tensioned ducts and measurement of water content in concrete

    E-Print Network [OSTI]

    Boyer, Edmond

    of water content in concrete F. Visco-Comandini(1) , T. Bore(2) , G. Six(1) , F. Sagnard(1) , S. Delepine water content assessment technologies [18]. Another example concerns the bridges which include "external of post tensioned ducts or to measure the water content in concrete, we propose a structural health

  16. Slow Sound in a duct, effective transonic flows and analogue black holes

    E-Print Network [OSTI]

    Aurégan, Yves; Michel, Florent; Pagneux, Vincent; Parentani, Renaud

    2015-01-01

    We propose a new system suitable for studying analogue gravity effects, consisting of a gas flowing in a duct with a compliant wall. Effective transonic flows are obtained from uniform, low Mach number flows through the reduction of the one-dimensional speed of sound induced by the wall compliance. We show that the modified equation for linear perturbations can be written in a Hamiltonian form. We perform a one-dimensional reduction consistent with the canonical formulation, and deduce the analogue metric along with the first dispersive term. In a weak dispersive regime, the spectrum emitted from a sonic horizon is numerically shown to be Planckian, and with a temperature fixed by the analogue surface gravity.

  17. Slow Sound in a duct, effective transonic flows and analogue black holes

    E-Print Network [OSTI]

    Yves Aurégan; Pierre Fromholz; Florent Michel; Vincent Pagneux; Renaud Parentani

    2015-03-09

    We propose a new system suitable for studying analogue gravity effects, consisting of a gas flowing in a duct with a compliant wall. Effective transonic flows are obtained from uniform, low Mach number flows through the reduction of the one-dimensional speed of sound induced by the wall compliance. We show that the modified equation for linear perturbations can be written in a Hamiltonian form. We perform a one-dimensional reduction consistent with the canonical formulation, and deduce the analogue metric along with the first dispersive term. In a weak dispersive regime, the spectrum emitted from a sonic horizon is numerically shown to be Planckian, and with a temperature fixed by the analogue surface gravity.

  18. Effect of Initial Disturbance on The Detonation Front Structure of a Narrow Duct

    E-Print Network [OSTI]

    Dou, Hua-Shu

    2010-01-01

    The effect of an initial disturbance on the detonation front structure in a narrow duct is studied by three-dimensional numerical simulation. The numerical method used includes a high resolution fifth-order weighted essentially non-oscillatory scheme for spatial discretization, coupled with a third order total variation diminishing Runge-Kutta time stepping method. Two types of disturbances are used for the initial perturbation. One is a random disturbance which is imposed on the whole area of the detonation front, and the other is a symmetrical disturbance imposed within a band along the diagonal direction on the front. The results show that the two types of disturbances lead to different processes. For the random disturbance, the detonation front evolves into a stable spinning detonation. For the symmetrical diagonal disturbance, the detonation front displays a diagonal pattern at an early stage, but this pattern is unstable. It breaks down after a short while and it finally evolves into a spinning detonati...

  19. Application of an EASM model for turbulent convective heat transfer in ribbed duct

    SciTech Connect (OSTI)

    Saidi, A.; Sunden, B.

    1999-07-01

    A numerical investigation is performed to predict local and mean thermal-hydraulic characteristics in rib-roughened ducts. The Navier-Stokes and energy equations, and a low-Re number {kappa}-{epsilon} turbulence model are solved with two methods for determination of the Reynolds stresses, eddy viscosity model (EVM) and explicit algebraic stress model (EASM). The numerical solution procedure uses a collocated grid, and the pressure-velocity coupling is handled by the SIMPLEC algorithm. The assumption of fully developed periodic conditions is applied. The calculated mean and local heat transfer enhancement values are compared with experimental data and fairly good agreement on mean Nu numbers is achieved. The prediction capabilities of the two turbulence models (EVM and EASM) are discussed. Both models have similar ability to predict the mean Nusselt numbers but the EASM model is superior in description of the flow field structure.

  20. Technology Solutions Case Study: Raised Ceiling Interior Duct System, New Smyrna, Florida

    SciTech Connect (OSTI)

    2014-09-01

    Builder S.E. Volusia County Habitat for Humanity (SEVHFH) was interested in constructing a home to the new U.S. Department of Energy (DOE) Zero Energy Ready Home standards. SEVHFH partners with DOE team Building America Partnership for Improved Residential Construction on Habitat for Humanity homes and routinely builds to ENERGY STAR V3.1. The only modification to the design needed to comply with the Zero Energy Ready Home criteria was the interior duct requirement. Unwilling to incur the added costs of a foam roof deck or wall heights that exceed 8 ft to accommodate a fur-down chase, SEVHFH opted to build a fur-up or raised ceiling chase. This case study describes the project.

  1. Linear and non-linear forced response of a conical, ducted, laminar premixed flame

    SciTech Connect (OSTI)

    Karimi, Nader; Brear, Michael J.; Jin, Seong-Ho; Monty, Jason P. [Department of Mechanical Engineering, University of Melbourne, Parkville, 3010 Vic. (Australia)

    2009-11-15

    This paper presents an experimental study on the dynamics of a ducted, conical, laminar premixed flame subjected to acoustic excitation of varying amplitudes. The flame transfer function is measured over a range of forcing frequencies and equivalence ratios. In keeping with previous works, the measured flame transfer function is in good agreement with that predicted by linear kinematic theory at low amplitudes of acoustic velocity excitation. However, a systematic departure from linear behaviour is observed as the amplitude of the velocity forcing upstream of the flame increases. This non-linearity is mostly in the phase of the transfer function and manifests itself as a roughly constant phase at high forcing amplitude. Nonetheless, as predicted by non-linear kinematic arguments, the response always remains close to linear at low forcing frequencies, regardless of the forcing amplitude. The origin of this phase behaviour is then sought through optical data post-processing. (author)

  2. PIV velocity measurements in the wake of an obstruction simulating a Taylor bubble in a duct

    SciTech Connect (OSTI)

    Vassallo, P.; Kumar, R.

    1997-06-01

    Mean velocity measurements in the wake of an obstruction simulating a Taylor bubble (or slug) have been obtained using Particle Image Velocimetry (PIV) in a duct. Two flow rates were established: one represented the flow behind a large gas slug rising in quiescent fluid and the other represented an idealized slug rising with a higher relative velocity, as typically found in higher void fraction churn-turbulent flow. The results indicate that, in a reference frame fixed to the slug, the flow around the sides of the slug behaves like wall bounded jets which eventually merge downstream of the slug. The ratio of wake volume to slug volume is nearly the same for both Reynolds numbers tested (i.e., 3.0 at Re = 3,628 and 2.9 at Re = 7.257) although the measurements suggest that the wake size decreases somewhat as the Reynolds number is increased.

  3. Impact of Ducting on Heat Pump Water Heater Space Conditioning Energy Use and Comfort

    SciTech Connect (OSTI)

    Widder, Sarah H.; Petersen, Joseph M.; Parker, Graham B.; Baechler, Michael C.

    2014-07-21

    Increasing penetration of heat pump water heaters (HPWHs) in the residential sector will offer an important opportunity for energy savings, with a theoretical energy savings of up to 63% per water heater and up to 11% of residential energy use (EIA 2009). However, significant barriers must be overcome before this technology will reach widespread adoption in the Pacific Northwest region and nationwide. One significant barrier noted by the Northwest Energy Efficiency Alliance (NEEA) is the possible interaction with the homes’ space conditioning system for units installed in conditioned spaces. Such complex interactions may decrease the magnitude of whole-house savings available from HPWH installed in the conditioned space in cold climates and could lead to comfort concerns (Larson et al. 2011; Kresta 2012). Modeling studies indicate that the installation location of HPWHs can significantly impact their performance and the resultant whole-house energy savings (Larson et al. 2012; Maguire et al. 2013). However, field data are not currently available to validate these results. This field evaluation of two GE GeoSpring HPWHs in the PNNL Lab Homes is designed to measure the performance and impact on the Lab Home HVAC system of a GE GeoSpring HPWH configured with exhaust ducting compared to an unducted GeoSpring HPWH during heating and cooling season periods; and measure the performance and impact on the Lab Home HVAC system of the GeoSpring HPWH with both supply and exhaust air ducting as compared to an unducted GeoSpring HPWH during heating and cooling season periods. Important metrics evaluated in these experiments include water heater energy use, HVAC energy use, whole house energy use, interior temperatures (as a proxy for thermal comfort), and cost impacts. This technical report presents results from the PNNL Lab Homes experiment.

  4. Search for the Standard Model Higgs Boson in the Diphoton Decay Channel with 4.9??fb[superscript -1] of pp Collision Data at ?s=7??TeV with ATLAS

    E-Print Network [OSTI]

    Taylor, Frank E.

    A search for the standard model Higgs boson is performed in the diphoton decay channel. The data used correspond to an integrated luminosity of 4.9??fb[superscript -1] collected with the ATLAS detector at the Large Hadron ...

  5. Search for Randall-Sundrum Gravitons in Dielectron and Diphoton Final States with 5.4fb-1 of D0 Data

    SciTech Connect (OSTI)

    Zhou, Ning; /Columbia U.

    2010-03-01

    A search for the lightest Kaluza-Klein mode of the graviton in the Randall-Sundrum model with a warped extra dimension is performed in the dielectron and diphoton channels. The data set used for the search corresponds to 5.4 fb{sup -1} of data from p{bar p} collisions at a center-of-mass energy of 1.96 TeV, collected with the D0 detector at the Fermilab Tevatron between July 2002 and Summer 2009. We search for resonances in the invariant mass spectrum of two electromagnetic showers from the decay of the graviton to either electron-positron pairs or photon pairs. To optimize the sensitivity, the dielectron and diphoton channels are analyzed separately, then the results are combined together in the end. We also investigate whether, due to the unique spin-2 nature of the graviton, the angular distribution of the final state particles can be used to significantly enhance the sensitivity of the search. We set 95% confidence level upper limits on the graviton production cross section times branching fraction into electron-positron pairs of between {approx} 7 fb and {approx} 0.5 fb for a range of graviton masses from 220 GeV and 1050 GeV, respectively. Compared with Randall-Sundrum model predictions, these results correspond to lower limits on the lightest graviton mass between 440 GeV and 1040 GeV, for the dimensionless graviton coupling to the Standard Model fields k/{bar M}{sub Pl} in the range from 0.01 to 0.1. In addition, for coupling k/{bar M}{sub Pl} of 0.01, gravitons with masses between 460 GeV and 560 GeV are also excluded at 95% confidence level. These results represent the most sensitive limits to date.

  6. Research Results from A Few Alternate Methods of Interior Duct Systems in Factory Built Housing Located In the Hot Humid Climate 

    E-Print Network [OSTI]

    Moyer, N.; Stroer, D.; Hoak, D.; McIlvaine, J.; Chandra, S.

    2008-01-01

    were 15.3% and 20.2% (5.8% improvement for duct design). The MHLab had the largest savings compared to the benchmark of 30.5% and 33.4% (4.1% improvement with interior ducts). DUCT DESIGN The Title 24 HUD Code Sec. 3280.511 Comfort cooling... 30% to 50% savings in whole- house energy use through a combination of energy efficiency and renewable energy measures. BAIHP focuses on factory builders (HUD code, Modular and Panelized), which is the housing segment not emphasized by the other...

  7. A steady state thermal duct model derived by fin-theory approach and applied on an unglazed solar collector

    SciTech Connect (OSTI)

    Stojanovic, B.; Hallberg, D.; Akander, J.

    2010-10-15

    This paper presents the thermal modelling of an unglazed solar collector (USC) flat panel, with the aim of producing a detailed yet swift thermal steady-state model. The model is analytical, one-dimensional (1D) and derived by a fin-theory approach. It represents the thermal performance of an arbitrary duct with applied boundary conditions equal to those of a flat panel collector. The derived model is meant to be used for efficient optimisation and design of USC flat panels (or similar applications), as well as detailed thermal analysis of temperature fields and heat transfer distributions/variations at steady-state conditions; without requiring a large amount of computational power and time. Detailed surface temperatures are necessary features for durability studies of the surface coating, hence the effect of coating degradation on USC and system performance. The model accuracy and proficiency has been benchmarked against a detailed three-dimensional Finite Difference Model (3D FDM) and two simpler 1D analytical models. Results from the benchmarking test show that the fin-theory model has excellent capabilities of calculating energy performances and fluid temperature profiles, as well as detailed material temperature fields and heat transfer distributions/variations (at steady-state conditions), while still being suitable for component analysis in junction to system simulations as the model is analytical. The accuracy of the model is high in comparison to the 3D FDM (the prime benchmark), as long as the fin-theory assumption prevails (no 'or negligible' temperature gradient in the fin perpendicularly to the fin length). Comparison with the other models also shows that when the USC duct material has a high thermal conductivity, the cross-sectional material temperature adopts an isothermal state (for the assessed USC duct geometry), which makes the 1D isothermal model valid. When the USC duct material has a low thermal conductivity, the heat transfer course of events adopts a 1D heat flow that reassembles the conditions of the 1D simple model (for the assessed USC duct geometry); 1D heat flow through the top and bottom fins/sheets as the duct wall reassembles a state of adiabatic condition. (author)

  8. Combined CDF and D0 Upper Limits on Standard Model Higgs Boson Production with up to 8.2 fb-1 of Data

    E-Print Network [OSTI]

    The CDF; D0 Collaborations; the TEVNPHWG Working Group

    2011-08-16

    We combine results from CDF and D0's direct searches for the standard model (SM) Higgs boson (H) produced in p-pbar collisions at the Fermilab Tevatron at sqrt(s)=1.96 TeV. The results presented here include those channels which are most sensitive to Higgs bosons with mass between 130 and 200 GeV/c^2, namely searches targeted at Higgs boson decays to W+W-, although acceptance for decays into tau+tau- and gamma gamma is included. Compared to the previous Tevatron Higgs search combination, more data have been added and the analyses have been improved to gain sensitivity. We use the MSTW08 parton distribution functions and the latest gg to H theoretical cross section predictions when testing for the presence of a SM Higgs boson. With up to 7.1 fb-1 of data analyzed at CDF, and up to 8.2 fb-1 at D0, the 95% C.L. upper limits on Higgs boson production is a factor of 0.54 times the SM cross section for a Higgs boson mass of 165 GeV/c^2. We exclude at the 95% C.L. the region 158

  9. Combined CDF and D0 Searches for the Standard Model Higgs Boson Decaying to Two Photons with up to 8.2 fb^-1

    SciTech Connect (OSTI)

    Not Available

    2011-07-01

    We combine results from CDF and D0's direct searches for the standard model (SM) Higgs boson (H) produced in p{bar p} collisions at the Fermilab Tevatron at {radical}s = 1.96 TeV, focusing on the decay H {yields} {gamma}{gamma}. We compute upper limits on the Higgs boson production cross section times the decay branching fraction in the range 100 < m{sub H} < 150 GeV/c{sup 2}, and we interpret the results in the context of the standard model. We use the MSTW08 parton distribution functions and the latest theoretical cross section predictions when testing for the presence of a SM Higgs boson. With datasets corresponding to 7.0 fb{sup -1} (CDF) and 8.2 fb{sup -1} (D0), the 95% C.L. upper limits on Higgs boson production is a factor of 10.5 times the SM cross section for a Higgs boson mass of 115 GeV/c{sup 2}.

  10. PASSIVE CONTROL OF PARTICLE DISPERSION IN A PARTICLE-LADEN CIRCULAR JET USING ELLIPTIC CO-ANNULAR FLOW: A MEANS FOR IMPROVING UTILIZATION AND EMISSION REDUCTIONS IN PULVERIZED COAL BURNER

    SciTech Connect (OSTI)

    Ahsan R. Choudhuri

    2003-06-01

    A passive control technology utilizing elliptic co-flow to control the particle flinging and particle dispersion in a particle (coal)-laden flow was investigated using experimental and numerical techniques. Preferential concentration of particles occurs in particle-laden jets used in pulverized coal burner and causes uncontrollable NO{sub x} formation due to inhomogeneous local stoichiometry. This particular project was aimed at characterizing the near-field flow behavior of elliptic coaxial jets. The knowledge gained from the project will serve as the basis of further investigation on fluid-particle interactions in an asymmetric coaxial jet flow-field and thus is important to improve the design of pulverized coal burners where non-homogeneity of particle concentration causes increased NO{sub x} formation.

  11. Development of a Laboratory Verified Single-Duct VAV System Model with Fan Powered Terminal Units Optimized Using Computational Fluid Dynamics 

    E-Print Network [OSTI]

    Davis, Michael A.

    2011-10-21

    Single Duct Variable Air Volume (SDVAV) systems use series and parallel Fan Powered Terminal Units to control the air flow in conditioned spaces. This research developed a laboratory verified model of SDVAV systems that ...

  12. Building America Technology Solutions for New and Existing Homes: New Insights for Improving the Designs of Flexible Duct Junction Boxes (Fact Sheet)

    Office of Energy Efficiency and Renewable Energy (EERE)

    IBACOS explored the relationships between pressure and physical configurations of flexible duct junction boxes by using computational fluid dynamics simulations to predict individual box parameters and total system pressure, thereby ensuring improved HVAC performance.

  13. In situ remediation of plutonium from glovebox exhaust ducts at the Department of Energy`s Rocky Flats Plant

    SciTech Connect (OSTI)

    Dugdale, J.S.; Humiston, T.J.; Omer, G.E.

    1993-10-01

    Plutonium and other miscellaneous hold-up materials have been accumulating in the glovebox exhaust ducts at the Rocky Flats Plant over the 40 years of weapons production at the site. The Duct Remediation Project was undertaken to assess the safety impacts of this material, and to remove it from the ductwork. The project necessitated the development of specialized tools, equipment and methods to remediate the material from continuously operating ventilation systems. Special engineered access locations were also required to provide access to the ductwork, and to ensure that safety and system operability were not degraded as a result of the remediation efforts. Operations personnel underwent significant training and development, and became an important asset to the success of the project. In total, the project succeeded in removing over 40 kilograms of plutonium-bearing material from one of the major weapons production buildings at the plant.

  14. Saving work to a CD-RW using the Optical CD Drive (CD Burner) Saving files to a Rewritable CD (or CD-RW) is very similar to the process described

    E-Print Network [OSTI]

    Machel, Hans

    Saving work to a CD-RW using the Optical CD Drive (CD Burner) Saving files to a Rewritable CD (or CD-RW) is very similar to the process described above for saving files to a Recordable CD (or CD to accept files again, so drag-and-drop the files that are on the desktop that you wish to save and when you

  15. EA-1472: Commercial Demonstration fo the Low Nox Burner/Separated Over-Fire Air (LNB/SOFA) Integration System Emission Reduction Technology, Holcolm Station, Sunflower Electric Power Corporation Finnety County, Kansas

    Broader source: Energy.gov [DOE]

    The DOE has prepared an Environmental Assessment (EA), to analyze the potential impacts of the commercial application of the Low-NOx Burner/Separated Over-Fire Air (LNB/SOFA) integration system to achieve nitrogen oxide (NOx) emissions reduction at Sunflower’s Holcomb Unit No. 1 (Holcomb Station), located near Garden City, in Finney County, Kansas. The Holcomb Station would be modified in three distinct phases to demonstrate the synergistic effect of layering NOx control technologies.

  16. Remote Duct Sealing in Residential and Commercial Buildings: Ā¨Saving Money, Saving Energy and Improving PerformanceĀˇ

    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:Financing Tool FitsProject Developsfor UCNIEnvironmentalAHRIRemote Duct Sealing in Residential and

  17. Particle deposition from turbulent flow: Review of published research and its applicability to ventilation ducts in commercial buildings

    SciTech Connect (OSTI)

    Sippola, Mark R.; Nazaroff, William W.

    2002-06-01

    This report reviews published experimental and theoretical investigations of particle deposition from turbulent flows and considers the applicability of this body of work to the specific case of particle deposition from flows in the ducts of heating, ventilating and air conditioning (HVAC) systems. Particle deposition can detrimentally affect the performance of HVAC systems and it influences the exposure of building occupants to a variety of air pollutants. The first section of this report describes the types of HVAC systems under consideration and discusses the components, materials and operating parameters commonly found in these systems. The second section reviews published experimental investigations of particle deposition rates from turbulent flows and considers the ramifications of the experimental evidence with respect to HVAC ducts. The third section considers the structure of turbulent airflows in ventilation ducts with a particular emphasis on turbulence investigations that have been used as a basis for particle deposition models. The final section reviews published literature on predicting particle deposition rates from turbulent flows.

  18. Formation mechanism of hairpin vortices in the wake of a truncated square cylinder in a duct

    E-Print Network [OSTI]

    Dousset, Vincent

    2010-01-01

    We investigate the laminar shedding of hairpin vortices in the wake of a truncated square cylinder placed in a duct, for Reynolds numbers around the critical threshold of the onset of vortex shedding. We single out the formation mechanism of the hairpin vortices by means of a detailed analysis of the flow patterns in the steady regime. We show that unlike in previous studies of similar structures, the dynamics of the hairpin vortices is entwined with that of the counter-rotating pair of streamwise vortices, which we found to be generated in the bottom part of the near wake (these are usually referred to as base vortices). In particular, once the hairpin structure is released, the base vortices attach to it, forming its legs, so these are streamwise, and not spanwise as previously observed in unconfined wakes or behind cylinders of lower aspect ratios. We also single out a trail of Omega-shaped vortices, generated between successive hairpin vortices through a mechanism that is analogous to that active in near-...

  19. Comprehensive report to Congress: Clean Coal Technology program: Evaluation of gas reburning and low-NO sub x burners on a wall-fired boiler

    SciTech Connect (OSTI)

    Not Available

    1990-09-01

    This report briefly describes the Gas Reburning and Low-NO{sub x} Burners technology which is a low-cost technology that can be applied in both retrofit and new applications. This demonstration will be conducted on a utility boiler in Colorado at Cherokee Station {number sign}3; however, the technology is applicable to industrial boilers and other combustion systems. Although this technology is primarily a NO{sub x} reduction technology, some reductions in other emissions will take place. Since 15--20% of the coal is replaced with natural gas, SO{sub 2} and particulate emissions are reduced commensurately. Also the lower carbon-to-hydrogen ratio of natural gas compared to coal reduces CO{sub 2} emissions. The formation of NO{sub x} is controlled by several factors: (1) the amount of nitrogen that is chemically bound in the fuel; (2) the flame temperature; (3) the residence time that combustion products remain at very high temperatures; and (4) the amount of excess oxygen available, especially at the hottest parts of the flame. Decreasing any of these parameters, tends to reduce NO{sub x} formation. 6 figs., 1 tab.

  20. Measurement of the ? ? * distribution of muon pairs with masses between 30 and 500 GeV in 10.4 fb - 1 of p p Æ collisions

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

    Abazov, V.?M.; Abbott, B.; Acharya, B.?S.; Adams, M.; Adams, T.; Agnew, J.?P.; Alexeev, G.?D.; Alkhazov, G.; Alton, A.; Askew, A.; et al

    2015-04-06

    We present a measurement of the distribution of the variable ?*? for muon pairs with masses between 30 and 500 GeV, using the complete run II data set collected by the D0 detector at the Fermilab Tevatron proton-antiproton collider. This corresponds to an integrated luminosity of 10.4 fb?¹ at ?s=1.96 TeV. The data are corrected for detector effects and presented in bins of dimuon rapidity and mass. The variable ?*? probes the same physical effects as the Z/?* boson transverse momentum, but is less susceptible to the effects of experimental resolution and efficiency. These are the first measurements at anymore »collider of the ?*? distributions for dilepton masses away from the Z?l?l? boson mass peak. The data are compared to QCD predictions based on the resummation of multiple soft gluons.« less