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Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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1

HOGEN{trademark} proton exchange membrane hydrogen generators: Commercialization of PEM electrolyzers  

SciTech Connect (OSTI)

PROTON Energy Systems` new HOGEN series hydrogen generators are Proton Exchange Membrane (PEM) based water electrolyzers designed to generate 300 to 1000 Standard Cubic Feet Per Hour (SCFH) of high purity hydrogen at pressures up to 400 psi without the use of mechanical compressors. This paper will describe technology evolution leading to the HOGEN, identify system design performance parameters and describe the physical packaging and interfaces of HOGEN systems. PEM electrolyzers have served US and UK Navy and NASA needs for many years in a variety of diverse programs including oxygen generators for life support applications. In the late 1970`s these systems were advocated for bulk hydrogen generation through a series of DOE sponsored program activities. During the military buildup of the 1980`s commercial deployment of PEM hydrogen generators was de-emphasized as priority was given to new Navy and NASA PEM electrolysis systems. PROTON Energy Systems was founded in 1996 with the primary corporate mission of commercializing PEM hydrogen generators. These systems are specifically designed and priced to meet the needs of commercial markets and produced through manufacturing processes tailored to these applications. The HOGEN series generators are the first step along the path to full commercial deployment of PEM electrolyzer products for both industrial and consumer uses. The 300/1000 series are sized to meet the needs of the industrial gases market today and provide a design base that can transition to serve the needs of a decentralized hydrogen infrastructure tomorrow.

Smith, W.F.; Molter, T.M. [Proton Energy Systems, Inc., Rocky Hill, CT (United States)

1997-12-31T23:59:59.000Z

2

Intergovernmental Advanced Stationary PEM Fuel Cell System Demonstration Final Report  

SciTech Connect (OSTI)

A program to complete the design, construction and demonstration of a PEMFC system fuelled by Ethanol, LPG or NG for telecom applications was initiated in October 2007. Early in the program the economics for Ethanol were shown to be unfeasible and permission was given by DOE to focus on LPG only. The design and construction of a prototype unit was completed in Jun 2009 using commercially available PEM FC stack from Ballard Power Systems. During the course of testing, the high pressure drop of the stack was shown to be problematic in terms of control and stability of the reformer. Also, due to the power requirements for air compression the overall efficiency of the system was shown to be lower than a similar system using internally developed low pressure drop FC stack. In Q3 2009, the decision was made to change to the Plug power stack and a second prototype was built and tested. Overall net efficiency was shown to be 31.5% at 3 kW output. Total output of the system is 6 kW. Using the new stack hardware, material cost reduction of 63% was achieved over the previous Alpha design. During a November 2009 review meeting Plug Power proposed and was granted permission, to demonstrate the new, commercial version of Plug Power's telecom system at CERL. As this product was also being tested as part of a DOE Topic 7A program, this part of the program was transferred to the Topic 7A program. In Q32008, the scope of work of this program was expanded to include a National Grid demonstration project of a micro-CHP system using hightemperature PEM technology. The Gensys Blue system was cleared for unattended operation, grid connection, and power generation in Aug 2009 at Union College in NY state. The system continues to operate providing power and heat to Beuth House. The system is being continually evaluated and improvements to hardware and controls will be implemented as more is learned about the system's operation. The program is instrumental in improving the efficiency and reducing costs of PEMFC based power systems using LPG fuel and continues to makes steps towards meeting DOE's targets. Plug Power would like to thank DOE for their support of this program.

Rich Chartrand

2011-08-31T23:59:59.000Z

3

PEM fuel cells for transportation and stationary power generation applications  

SciTech Connect (OSTI)

We describe recent activities at LANL devoted to polymer electrolyte fuel cells in the contexts of stationary power generation and transportation applications. A low cost/high performance hydrogen or reformate/air stack technology is being developed based on ultralow Pt loadings and on non-machined, inexpensive elements for flow-fields and bipolar plates. On board methanol reforming is compared to the option of direct methanol fuel cells because of recent significant power density increases demonstrated in the latter.

Cleghorn, S.J.; Ren, X.; Springer, T.E.; Wilson, M.S.; Zawodzinski, C.; Zawodzinski, T.A. Jr.; Gottesfeld, S.

1996-05-01T23:59:59.000Z

4

PEM fuel cell degradation  

SciTech Connect (OSTI)

The durability of PEM fuel cells is a major barrier to the commercialization of these systems for stationary and transportation power applications. While significant progress has been made in understanding degradation mechanisms and improving materials, further improvements in durability are required to meet commercialization targets. Catalyst and electrode durability remains a primary degradation mode, with much work reported on understanding how the catalyst and electrode structure degrades. Accelerated Stress Tests (ASTs) are used to rapidly evaluate component degradation, however the results are sometimes easy, and other times difficult to correlate. Tests that were developed to accelerate degradation of single components are shown to also affect other component's degradation modes. Non-ideal examples of this include ASTs examining catalyst degradation performances losses due to catalyst degradation do not always well correlate with catalyst surface area and also lead to losses in mass transport.

Borup, Rodney L [Los Alamos National Laboratory; Mukundan, Rangachary [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

5

Multi-phase Multi-dimensional Analysis of PEM Fuel Cells with Carbon Monoxide Poisoning and Oxygen Bleeding.  

E-Print Network [OSTI]

??Polymer electrolyte membrane (PEM) fuel cells are promising alternative green power source for mobile, portable and stationary applications. However, their cost, durability, and performance are… (more)

Li, Yaqun

2010-01-01T23:59:59.000Z

6

Low Cost PEM Fuel Cell Metal Bipolar Plates  

E-Print Network [OSTI]

Low Cost PEM Fuel Cell Metal Bipolar Plates CH Wang TreadStone Technologies, Inc. Fuel Cell Project, stationary and automobile fuel cell systems. $0.00 $0.05 $0.10 $0.15 $0.20 $0.25 $0.30 $0.35 $0.40 $0.45 $0. · The technology has been evaluated by various clients and used in portable fuel cell power systems. Corporate

7

Cell Component Accelerated Stress Test Protocols for PEM Fuel...  

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

Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells Accelerated Stress Test Protocols for PEM...

8

Automotive Perspective on PEM Evaluation  

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

at least it's worth running FC tests * If HSF>10: material may be durable enough with MEA optimization Screening for PEM Chemical Stability Ex-situ Fenton's ageing tests are not...

9

PEM/SPE fuel cell  

DOE Patents [OSTI]

A PEM/SPE fuel cell is described including a membrane-electrode assembly (MEA) having a plurality of oriented filament embedded the face thereof for supporting the MEA and conducting current therefrom to contiguous electrode plates. 4 figs.

Grot, S.A.

1998-01-13T23:59:59.000Z

10

PEM/SPE fuel cell  

DOE Patents [OSTI]

A PEM/SPE fuel cell including a membrane-electrode assembly (MEA) having a plurality of oriented filament embedded the face thereof for supporting the MEA and conducting current therefrom to contiguous electrode plates.

Grot, Stephen Andreas (Henrietta, NY)

1998-01-01T23:59:59.000Z

11

Degradation Mechanisms and Accelerated Testing in PEM Fuel Cells  

SciTech Connect (OSTI)

The durability of PEM fuel cells is a major barrier to the commercialization of these systems for stationary and transportation power applications. Although there has been recent progress in improving durability, further improvements are needed to meet the commercialization targets. Past improvements have largely been made possible because of the fundamental understanding of the underlying degradation mechanisms. By investigating component and cell degradation modes; defining the fundamental degradation mechanisms of components and component interactions new materials can be designed to improve durability. Various factors have been shown to affect the useful life of PEM fuel cells. Other issues arise from component optimization. Operational conditions (such as impurities in either the fuel or oxidant stream), cell environment, temperature (including subfreezing exposure), pressure, current, voltage, etc.; or transient versus continuous operation, including start-up and shutdown procedures, represent other factors that can affect cell performance and durability.

Borup, Rodney L. [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

12

Degradation mechanisms and accelerated testing in PEM fuel cells  

SciTech Connect (OSTI)

The durability of PEM fuel cells is a major barrier to the commercialization of these systems for stationary and transportation power applications. Although there has been recent progress in improving durability, further improvements are needed to meet the commercialization targets. Past improvements have largely been made possible because of the fundamental understanding of the underlying degradation mechanisms. By investigating component and cell degradation modes; defining the fundamental degradation mechanisms of components and component interactions new materials can be designed to improve durability. Various factors have been shown to affect the useful life of PEM fuel cells. Other issues arise from component optimization. Operational conditions (such as impurities in either the fuel and oxidant stream), cell environment, temperature (including subfreezing exposure), pressure, current, voltage, etc.; or transient versus continuous operation, including start-up and shutdown procedures, represent other factors that can affect cell performance and durability. The need for Accelerated Stress Tests (ASTs) can be quickly understood given the target lives for fuel cell systems: 5000 hours ({approx} 7 months) for automotive, and 40,000 hrs ({approx} 4.6 years) for stationary systems. Thus testing methods that enable more rapid screening of individual components to determine their durability characteristics, such as off-line environmental testing, are needed for evaluating new component durability in a reasonable turn-around time. This allows proposed improvements in a component to be evaluated rapidly and independently, subsequently allowing rapid advancement in PEM fuel cell durability. These tests are also crucial to developers in order to make sure that they do not sacrifice durability while making improvements in costs (e.g. lower platinum group metal [PGM] loading) and performance (e.g. thinner membrane or a GDL with better water management properties). To achieve a deeper understanding and improve PEM fuel cell durability LANL is conducting research to better define fuel cell component degradation mechanisms and correlate AST measurements to component in 'real-world' situations.

Borup, Rodney L [Los Alamos National Laboratory; Mukundan, Rangachary [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

13

Drops, Slugs, and FloodingDrops, Slugs, and Flooding in PEM Fuel Cellsin PEM Fuel Cells  

E-Print Network [OSTI]

Drops, Slugs, and FloodingDrops, Slugs, and Flooding in PEM Fuel Cellsin PEM Fuel Cells A Study Fuel CellBackground: PEM Fuel Cell Graphic by Marc Marshall, Schatz Energy Research Center http ProjectDrag Project SetupSetup MFC (H2, N2 Inputs) Bubbler Current Humidity Sensor Modified PEM Fuel Cell

Petta, Jason

14

Novel, low-cost separator plates and flow-field elements for use in PEM fuel cells  

SciTech Connect (OSTI)

PEM fuel cells offer promise for a wide range of applications including vehicular (e.g., automotive) and stationary power generation. The performance and cost targets that must be met for PEM technology to be commercially successful varies to some degree with the application. However, in general the cost of PEM fuel cell stacks must be reduced substantially if they are to see widespread use for electrical power generation. A significant contribution to the manufactured cost of PEM fuel cells is the machined carbon plates that traditionally serve as bipolar separator plates and flow-field elements. In addition, carbon separator plates are inherently brittle and suffer from breakage due to shock, vibration, and improper handling. This report describes a bifurcated separator device with low resistivity, low manufacturing cost, compact size and durability.

Edlund, D.J. [Northwest Power Systems, LLC, Bend, OR (United States)

1996-12-31T23:59:59.000Z

15

Development and validation of a two-phase, three-dimensional model for PEM fuel cells.  

SciTech Connect (OSTI)

The objectives of this presentation are: (1) To develop and validate a two-phase, three-dimensional transport modelfor simulating PEM fuel cell performance under a wide range of operating conditions; (2) To apply the validated PEM fuel cell model to improve fundamental understanding of key phenomena involved and to identify rate-limiting steps and develop recommendations for improvements so as to accelerate the commercialization of fuel cell technology; (3) The validated PEMFC model can be employed to improve and optimize PEM fuel cell operation. Consequently, the project helps: (i) address the technical barriers on performance, cost, and durability; and (ii) achieve DOE's near-term technical targets on performance, cost, and durability in automotive and stationary applications.

Chen, Ken Shuang

2010-04-01T23:59:59.000Z

16

Phase 1 feasibility study of an integrated hydrogen PEM fuel cell system. Final report  

SciTech Connect (OSTI)

Evaluated in the report is the use of hydrogen fueled proton exchange membrane (PEM) fuel cells for devices requiring less than 15 kW. Metal hydrides were specifically analyzed as a method of storing hydrogen. There is a business and technical part to the study that were developed with feedback from each other. The business potential of a small PEM product is reviewed by examining the markets, projected sales, and required investment. The major technical and cost hurdles to a product are also reviewed including: the membrane and electrode assembly (M and EA), water transport plate (WTP), and the metal hydrides. It was concluded that the best potential stationary market for hydrogen PEM fuel cell less than 15 kW is for backup power use in telecommunications applications.

Luczak, F.

1998-03-01T23:59:59.000Z

17

Corrosion resistant PEM fuel cell  

DOE Patents [OSTI]

A PEM fuel cell having electrical contact elements comprising a corrosion-susceptible substrate metal coated with an electrically conductive, corrosion-resistant polymer containing a plurality of electrically conductive, corrosion-resistant filler particles. The substrate may have an oxidizable metal first layer (e.g., stainless steel) underlying the polymer coating.

Fronk, Matthew Howard (Honeoye Falls, NY); Borup, Rodney Lynn (East Rochester, NY); Hulett, Jay S. (Rochester, NY); Brady, Brian K. (North Chili, NY); Cunningham, Kevin M. (Romeo, MI)

2002-01-01T23:59:59.000Z

18

Corrosion resistant PEM fuel cell  

DOE Patents [OSTI]

A PEM fuel cell having electrical contact elements comprising a corrosion-susceptible substrate metal coated with an electrically conductive, corrosion-resistant polymer containing a plurality of electrically conductive, corrosion-resistant filler particles. The substrate may have an oxidizable metal first layer (e.g., stainless steel) underlying the polymer coating.

Fronk, Matthew Howard (Honeoye Falls, NY); Borup, Rodney Lynn (East Rochester, NY); Hulett, Jay S. (Rochester, NY); Brady, Brian K. NY); Cunningham, Kevin M. (Romeo, MI)

2011-06-07T23:59:59.000Z

19

PEM Electrolyzer Incorporating an Advanced  

E-Print Network [OSTI]

PEM Electrolyzer Incorporating an Advanced Low Cost Membrane Monjid Hamdan Giner Electrochemical (Academic)­ Membrane Development Collaborations 3M Fuel Cell Components Program­ NSTF Catalyst & Membrane Entegris ­ Carbon Cell Separators Tokuyama ­ Low-Cost Membrane Prof. R. Zalosh (WPI) ­ Hydrogen Safety

20

Design Considerations for a PEM Fuel Cell Powered Truck APU  

E-Print Network [OSTI]

performed a study on PEM fuel cell APUs. Based upon previousConsiderations for a PEM Fuel Cell Powered Truck APU Davidsuccessfully demonstrated a PEM fuel cell APU on a Century

Grupp, David J; Forrest, Matthew E.; Mader, Pippin G.; Brodrick, Christie-Joy; Miller, Marshall; Dwyer, Harry A.

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold...  

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

Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold Flooding During Continuous Fuel Cell Operation. Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold...

22

DOE Cell Component Accelerated Stress Test Protocols for PEM...  

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

Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells DOE Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells This document describes test protocols...

23

Mass Production Cost Estimation of Direct Hydrogen PEM Fuel Cell...  

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

Mass Production Cost Estimation of Direct Hydrogen PEM Fuel Cell Systems for Transportation Applications: 2012 Update Mass Production Cost Estimation of Direct Hydrogen PEM Fuel...

24

New Membranes for PEM Fuel Cells  

Broader source: Energy.gov [DOE]

Presentation on New Membranes for PEM Fuel Cells to the High Temperature Membrane Working Group Meeting held in Arlington, Virginia, May 26,2005.

25

Webinar: Advanced Electrocatalysts for PEM Fuel Cells  

Broader source: Energy.gov [DOE]

Video recording of the Fuel Cell Technologies Office webinar, Advanced Electrocatalysts for PEM Fuel Cells, originally presented on February 12, 2013.

26

Manufacturing Barriers to High Temperature PEM Commercialization...  

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

Barriers to High Temperature PEM Commercialization Presented at the NREL Hydrogen and Fuel Cell Manufacturing R&D Workshop in Washington, DC, August 11-12, 2011....

27

Corrosion resistant PEM fuel cell  

DOE Patents [OSTI]

The present invention contemplates a PEM fuel cell having electrical contact elements (including bipolar plates/septums) comprising a titanium nitride coated light weight metal (e.g., Al or Ti) core, having a passivating, protective metal layer intermediate the core and the titanium nitride. The protective layer forms a barrier to further oxidation/corrosion when exposed to the fuel cell's operating environment. Stainless steels rich in CR, Ni, and Mo are particularly effective protective interlayers.

Li, Yang (Troy, MI); Meng, Wen-Jin (Okemos, MI); Swathirajan, Swathy (West Bloomfield, MI); Harris, Stephen Joel (Bloomfield, MI); Doll, Gary Lynn (Orion Township, Oakland County, MI)

2002-01-01T23:59:59.000Z

28

Corrosion resistant PEM fuel cell  

DOE Patents [OSTI]

The present invention contemplates a PEM fuel cell having electrical contact elements (including bipolar plates/septums) comprising a titanium nitride coated light weight metal (e.g., Al or Ti) core, having a passivating, protective metal layer intermediate the core and the titanium nitride. The protective layer forms a barrier to further oxidation/corrosion when exposed to the fuel cell's operating environment. Stainless steels rich in CR, Ni, and Mo are particularly effective protective interlayers.

Li, Yang (Troy, MI); Meng, Wen-Jin (Okemos, MI); Swathirajan, Swathy (West Bloomfield, MI); Harris, Stephen J. (Bloomfield, MI); Doll, Gary L. (Orion Township, Oakland County, MI)

1997-01-01T23:59:59.000Z

29

Corrosion resistant PEM fuel cell  

DOE Patents [OSTI]

The present invention contemplates a PEM fuel cell having electrical contact elements (including bipolar plates/septums) comprising a titanium nitride coated light weight metal (e.g., Al or Ti) core, having a passivating, protective metal layer intermediate the core and the titanium nitride. The protective layer forms a barrier to further oxidation/corrosion when exposed to the fuel cell`s operating environment. Stainless steels rich in Cr, Ni, and Mo are particularly effective protective interlayers. 6 figs.

Li, Y.; Meng, W.J.; Swathirajan, S.; Harris, S.J.; Doll, G.L.

1997-04-29T23:59:59.000Z

30

PEM fuel cell monitoring system  

DOE Patents [OSTI]

Method and apparatus for monitoring the performance of H.sub.2 --O.sub.2 PEM fuel cells. Outputs from a cell/stack voltage monitor and a cathode exhaust gas H.sub.2 sensor are corrected for stack operating conditions, and then compared to predetermined levels of acceptability. If certain unacceptable conditions coexist, an operator is alerted and/or corrective measures are automatically undertaken.

Meltser, Mark Alexander (Pittsford, NY); Grot, Stephen Andreas (West Henrietta, NY)

1998-01-01T23:59:59.000Z

31

PEM fuel cell monitoring system  

DOE Patents [OSTI]

Method and apparatus are disclosed for monitoring the performance of H{sub 2}--O{sub 2} PEM fuel cells. Outputs from a cell/stack voltage monitor and a cathode exhaust gas H{sub 2} sensor are corrected for stack operating conditions, and then compared to predetermined levels of acceptability. If certain unacceptable conditions coexist, an operator is alerted and/or corrective measures are automatically undertaken. 2 figs.

Meltser, M.A.; Grot, S.A.

1998-06-09T23:59:59.000Z

32

Development of Sensors for Automotive PEM-based Fuel Cells  

E-Print Network [OSTI]

organization #12;4 Sensors for Automotive PEM Fuel Cells - Motivation Sensor Performance and Cost ImprovementsDevelopment of Sensors for Automotive PEM-based Fuel Cells DOE Agreement DE-FC04-02AL67616 Brian FC Series 200 - 50 kW PEM #12;2 Development of Sensors for Automotive PEM-based Fuel Cells ­ Program

33

Sensor Development for PEM Fuel Cell Systems  

SciTech Connect (OSTI)

This document reports on the work done by Honeywell Sensing and Control to investigate the feasibility of modifying low cost Commercial Sensors for use inside a PEM Fuel Cell environment. Both stationary and automotive systems were considered. The target environment is hotter (100 C) than the typical commercial sensor maximum of 70 C. It is also far more humid (100% RH condensing) than the more typical 95% RH non-condensing at 40 C (4% RH maximum at 100 C). The work focused on four types of sensors, Temperature, Pressure, Air Flow and Relative Humidity. Initial design goals were established using a market research technique called Market Driven Product Definition (MDPD). A series of interviews were conducted with various users and system designers in their facilities. The interviewing team was trained in data taking and analysis per the MDPD process. The final result was a prioritized and weighted list of both requirements and desires for each sensor. Work proceeded on concept development for the 4 types of sensors. At the same time, users were developing the actual fuel cell systems and gaining knowledge and experience in the use of sensors and controls systems. This resulted in changes to requirements and desires that were not anticipated during the MDPD process. The concepts developed met all the predicted requirements. At the completion of concept development for the Pressure Sensor, it was determined that the Fuel Cell developers were happy with off-the-shelf automotive pressure sensors. Thus, there was no incentive to bring a new Fuel Cell Specific Pressure Sensor into production. Work was therefore suspended. After the experience with the Pressure Sensor, the requirements for a Temperature Sensor were reviewed and a similar situation applied. Commercially available temperature sensors were adequate and cost effective and so the program was not continued from the Concept into the Design Phase.

Steve Magee; Richard Gehman

2005-07-12T23:59:59.000Z

34

FUEL CELL SYSTEM ECONOMICS: COMPARING THE COSTS OF GENERATING POWER WITH STATIONARY  

E-Print Network [OSTI]

FUEL CELL SYSTEM ECONOMICS: COMPARING THE COSTS OF GENERATING POWER WITH STATIONARY AND MOTOR VEHICLE PEM FUEL CELL SYSTEMS UCD-ITS-RP-04-21 April 2004 by Timothy Lipman University of California: itspublications@ucdavis.edu #12;Energy Policy 32 (2004) 101­125 Fuel cell system economics: comparing the costs

Kammen, Daniel M.

35

A retrospective on the LBNL PEM project  

E-Print Network [OSTI]

Submitted to Physica Medica LBNL 56612 [6] M. Pedrali- Noy,Submitted to Physica Medica LBNL 56612 ARETROSPECTIVE ON THE LBNL PEM PROJECT J.S. Huber, W.W.

2004-01-01T23:59:59.000Z

36

PEM Degradation Investigation Final Technical Report  

SciTech Connect (OSTI)

This project conducted fundamental studies of PEM MEA degradation. Insights gained from these studies were disseminated to assist MEA manufacturers in understanding degradation mechanisms and work towards DOE 2010 fuel cell durability targets.

Dan Stevenson; Lee H Spangler

2010-10-18T23:59:59.000Z

37

New Membranes for PEM Fuel Cells  

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

Membranes for PEM Fuel Cells Steve Hamrock 3M Fuel Cell Components Program 3M Center 201-1W-28 St Paul MN 55144 USA HTMWG Meeting 52705 This research was supported in part by the...

38

2007 Status of Manufacturing: Polymer Electrolyte Membrane (PEM) Fuel Cells  

SciTech Connect (OSTI)

In this document we assess the North American industry's current ability to manufacture polymer electrolyte membrane (PEM) fuel cells.

Wheeler, D.; Sverdrup, G.

2008-03-01T23:59:59.000Z

39

A comparative analysis of two PEM fuel cell modeling tools  

E-Print Network [OSTI]

A comparative analysis of two PEM fuel cell modeling tools M.L. Sarmiento-Carnevali*1 , S. Strahl1-electrolyte- membrane (PEM) fuel cells, Energy, 33(9): 1331-1352, 2008. [2] M. Mangold, A. Bück, and R. Hanke-Rauschenbach, Passivity based control of a distributed PEM fuel cell model, Journal of Process Control, 20(3): 292

Batlle, Carles

40

NUMERICAL PREDICTION OF TEMPERATURE DISTRIBUTION IN PEM FUEL CELLS  

E-Print Network [OSTI]

NUMERICAL PREDICTION OF TEMPERATURE DISTRIBUTION IN PEM FUEL CELLS S. Shimpalee and S. Dutta distribution inside a straight channel proton exchange membrane ( PEM) fuel cell and the effect of heat is called the proton exchange membrane (PEM) fuel cell that operates at a signi¢cantly lower temperature

Van Zee, John W.

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Final Scientific Report, New Proton Conductive Composite Materials for PEM Fuel Cells  

SciTech Connect (OSTI)

This project covered one of the main challenges in present-day PEM fuel cell technology: to design a membrane capable of maintaining high conductivity and mechanical integrity when temperature is elevated and water vapor pressure is severely reduced. The DOE conductivity milestone of 0.1 S cm-1 at 120 degrees C and 50 % relative humidity (RH) for designed membranes addressed the target for the project. Our approach presumed to develop a composite membrane with hydrophilic proton-conductive inorganic material and the proton conductive polymeric matrix that is able to “bridge” the conduction paths in the membrane. The unique aspect of our approach was the use of highly functionalized inorganic additives to benefit from their water retention properties and high conductivity as well. A promising result turns out that highly hydrophilic phosphorsilicate gels added in Nafion matrix improved PEM fuel cell performance by over 50% compared with bare Nafion membrane at 120 degrees C and 50 % RH. This achievement realizes that the fuel cell operating pressure can be kept low, which would make the PEM fuel cell much more cost efficient and adaptable to practical operating conditions and facilitate its faster commercialization particularly in automotive and stationary applications.

Lvov, Serguei

2010-11-08T23:59:59.000Z

42

Brazed bipolar plates for PEM fuel cells  

DOE Patents [OSTI]

A liquid-cooled, bipolar plate separating adjacent cells of a PEM fuel cell comprises corrosion-resistant metal sheets brazed together so as to provide a passage between the sheets through which a dielectric coolant flows. The brazement comprises a metal which is substantially insoluble in the coolant. 6 figs.

Neutzler, J.K.

1998-07-07T23:59:59.000Z

43

Low Temperature PEM Fuel Cell Manufacturing Needs  

E-Print Network [OSTI]

Low Temperature PEM Fuel Cell Manufacturing Needs Presented by Duarte Sousa, PE Manufacturing Fuel Cell Manhattan Project #12; Cost drivers were identified for the following: · MEA · Plates · Balance of Plant (BOP) · Fuel Processing Manufacturing Fuel Cell Project ­ Phase 1 Note that this presentation

44

Polyphenylene Sulfonic Acid: a new PEM  

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

swelling. *Can be directly cast on electrode as PEM in MEA processing for low power micro-fuel cells. CF 2 CF 2 CF 2 CF O CF 2 C O CF 2 CF 2 CF 3 F SO 3 H n m Nafion The most...

45

Brazed bipolar plates for PEM fuel cells  

DOE Patents [OSTI]

A liquid-cooled, bipolar plate separating adjacent cells of a PEM fuel cell comprising corrosion-resistant metal sheets brazed together so as to provide a passage between the sheets through which a dielectric coolant flows. The brazement comprises a metal which is substantially insoluble in the coolant.

Neutzler, Jay Kevin (Rochester, NY)

1998-01-01T23:59:59.000Z

46

Forecasting the Costs of Automotive PEM Fuel Cell Systems: Using Bounded Manufacturing Progress Functions  

E-Print Network [OSTI]

s pilot-scale PEM fuel cell manufactunng cost, and theproductaon, PEM fuel cell systems could cost $35 - 90/kW,is how PEM fuel cell system manufactunng costs might evolve

Lipman, Timonthy E.; Sperling, Daniel

2001-01-01T23:59:59.000Z

47

Liquid-Water Uptake and Removal in PEM Fuel-Cell Components  

E-Print Network [OSTI]

Uptake and Removal in PEM Fuel-Cell Components Prodip K. DasWater management in PEM fuel cells is critical for optimumof droplet dynamics in PEM fuel-cell gas flow channels has

Das, Prodip K.

2013-01-01T23:59:59.000Z

48

Forecasting the Costs of Automotive PEM Fuel Cell Systems: Using Bounded Manufacturing Progress Functions  

E-Print Network [OSTI]

Costs of Automotive PEM Fuel Cell Systems - Using BoundedCosts of Automotive PEM Fuel Cell Systems - Using BoundedCosts of Automotive PEM Fuel Cell Systems Forecasting the

Lipman, Timonthy E.; Sperling, Daniel

2001-01-01T23:59:59.000Z

49

E-Print Network 3.0 - applications pem fuel Sample Search Results  

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

for: applications pem fuel Page: << < 1 2 3 4 5 > >> 1 High Performance PEM Fuel Cells The development of high performance PEM fuel cells reflects the need Summary: been...

50

The Corrosion of PEM Fuel Cell Catalyst Supports and Its Implications...  

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

The Corrosion of PEM Fuel Cell Catalyst Supports and Its Implications for Developing Durable Catalysts. The Corrosion of PEM Fuel Cell Catalyst Supports and Its Implications for...

51

E-Print Network 3.0 - advanced pem fuel Sample Search Results  

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

tolerant PEM Fuel Cell System utilizing advanced components, high temperature membrane Praxair Process... Powders Reformate-Tolerant Membrane Electrode Assemblies (MEAs) for PEM...

52

Comprehensive, Consistent and Systematic Approach to the Mathematical Modeling of PEM Fuel Cells.  

E-Print Network [OSTI]

??Polymer electrolyte membrane (PEM) fuel cells are a promising zero-emission power source for transportation applications. An important tool for advancing PEM fuel cell technology is… (more)

Baschuk, Jeffrey

2006-01-01T23:59:59.000Z

53

Mass Production Cost Estimation of Direct Hydrogen PEM Fuel Cell...  

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

Mass Production Cost Estimation of Direct H 2 PEM Fuel Cell Systems for Transportation Applications: 2012 Update October 18, 2012 Prepared By: Brian D. James Andrew B. Spisak...

54

Manufacturing R&D of PEM Fuel Cells  

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

for the Hydrogen Economy Manufacturing Research & Development of PEM Fuel Cell Systems for Transportation Applications Background Material for the Manufacturing R&D Workshop to be...

55

Water Transport in PEM Fuel Cells: Advanced Modeling, Material...  

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

Testing, and Design Optimization Water Transport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing, and Design Optimization This presentation, which focuses on...

56

Water Transport in PEM Fuel Cells: Advanced Modeling, Material...  

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

Testing and Design Optimization Water Transport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing and Design Optimization Part of a 100 million fuel cell award...

57

DOE Cell Component Accelerated Stress Test Protocols for PEM...  

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

CELL COMPONENT ACCELERATED STRESS TEST PROTOCOLS FOR PEM FUEL CELLS (Electrocatalysts, Supports, Membranes, and Membrane Electrode Assemblies) March 2007 Fuel cells, especially for...

58

Investigation of metallic bipolar plates for PEM fuel cells.  

E-Print Network [OSTI]

?? High cost and a short lifetime are the two main reasons why the PEM fuel cell is yet to be commercialized. The bipolar plate… (more)

Lædre, Sigrid

2011-01-01T23:59:59.000Z

59

Novel Catalyst Support Materials for PEM Fuel Cells: Current...  

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

great influence on the cost, performance, and durability of polymer electrolyte membrane (PEM) fuel cells. This review paper is to summarize several important kinds of novel...

60

Cell Component Accelerated Stress Test Protocols for PEM Fuel...  

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

USCAR FUEL CELL TECH TEAM CELL COMPONENT ACCELERATED STRESS TEST PROTOCOLS FOR PEM FUEL CELLS (Electrocatalysts, Supports, Membranes, and Membrane Electrode Assemblies) Revised May...

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Assessment of humidity management effects on PEM fuel cell performance.  

E-Print Network [OSTI]

?? The electrical energy output and the performance of a PEM fuel cell is dependent on the ion transfer in the fuel cell. The ion… (more)

Osamudiamen Ose Micah, Ose Micah

2011-01-01T23:59:59.000Z

62

Mass Transfer and GDL Electric Resistance in PEM Fuel Cells.  

E-Print Network [OSTI]

??Many modeling studies have been carried out to simulate the current distribution across the channel and shoulder direction in a proton exchange membrane (PEM) fuel… (more)

Wang, Lin

2010-01-01T23:59:59.000Z

63

Development of Micro-structural Mitigation Strategies for PEM...  

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

Development of Micro-structural Mitigation Strategies for PEM Fuel Cells: Morphological Simulation and Experimental Approaches Development of Micro-structural Mitigation Strategies...

64

Surface Wettability Impact on Water Management in PEM Fuel Cell.  

E-Print Network [OSTI]

??Excessive water formation inside the polymer electrolyte membrane (PEM) fuel cell’s structures leads to the flooding of the cathode gas diffusion layer (GDL) and cathode… (more)

Al Shakhshir, Saher

2012-01-01T23:59:59.000Z

65

Webinar: Micro-Structural Mitigation Strategies for PEM Fuel Cells  

Broader source: Energy.gov [DOE]

Video recording of the Fuel Cell Technologies Office webinar, Micro-Structural Mitigation Strategies for PEM Fuel Cells, originally presented on November 19, 2013.

66

Fiber Optic Sensors for PEM Fuel Cells Nigel David  

E-Print Network [OSTI]

Fiber Optic Sensors for PEM Fuel Cells by Nigel David B.Sc., Simon Fraser University, 2004 M or other means, without the permission of the author. #12;ii Fiber Optic Sensors for PEM Fuel Cells Fyles, Outside Member (Department of Chemistry) ABSTRACT Fibre-optic sensing techniques for application

Victoria, University of

67

Water Management in Polymer Electrolyte Membrane (PEM) Fuel Cells  

E-Print Network [OSTI]

Water Management in Polymer Electrolyte Membrane (PEM) Fuel Cells Catherine Chan & Lauren Isbell objectives Important variables that lead to results Conclusion #12;Basic Operation of a PEM Fuel Cell fuel cell? A flow channel? The importance of water management Experimental setup and methods Project

Petta, Jason

68

The performance of PEM fuel cells fed with oxygen through the free-convection mode  

E-Print Network [OSTI]

The performance of PEM fuel cells fed with oxygen through the free-convection mode Pei-Wen Li; accepted 27 September 2002 Abstract The feasibility and restrictions of feeding oxygen to a PEM fuel cell in the fuel cell. Experimental tests were conducted for one PEM fuel cell stack and two single PEM fuel cell

69

MATHEMATICAL MODELING OF CHANNEL POROUS LAYER INTERFACES IN PEM FUEL CELLS  

E-Print Network [OSTI]

two types of PEM fuel cells: H2 PEM fuel cells (H2PEMFC) driven by gaseous hydrogen, and directMATHEMATICAL MODELING OF CHANNEL ­ POROUS LAYER INTERFACES IN PEM FUEL CELLS M. EHRHARDT, J, Germany ABSTRACT In proton exchange membrane (PEM) fuel cells, the transport of the fuel to the active

Ehrhardt, Matthias

70

Pattern recognition monitoring of PEM fuel cell  

DOE Patents [OSTI]

The CO-concentration in the H.sub.2 feed stream to a PEM fuel cell stack is monitored by measuring current and voltage behavior patterns from an auxiliary cell attached to the end of the stack. The auxiliary cell is connected to the same oxygen and hydrogen feed manifolds that supply the stack, and discharges through a constant load. Pattern recognition software compares the current and voltage patterns from the auxiliary cell to current and voltage signature determined from a reference cell similar to the auxiliary cell and operated under controlled conditions over a wide range of CO-concentrations in the H.sub.2 fuel stream.

Meltser, Mark Alexander (Pittsford, NY)

1999-01-01T23:59:59.000Z

71

Pattern recognition monitoring of PEM fuel cell  

DOE Patents [OSTI]

The CO-concentration in the H{sub 2} feed stream to a PEM fuel cell stack is monitored by measuring current and voltage behavior patterns from an auxiliary cell attached to the end of the stack. The auxiliary cell is connected to the same oxygen and hydrogen feed manifolds that supply the stack, and discharges through a constant load. Pattern recognition software compares the current and voltage patterns from the auxiliary cell to current and voltage signature determined from a reference cell similar to the auxiliary cell and operated under controlled conditions over a wide range of CO-concentrations in the H{sub 2} fuel stream. 4 figs.

Meltser, M.A.

1999-08-31T23:59:59.000Z

72

Research and Development of a PEM Fuel Cell, Hydrogen Reformer, and Vehicle Refueling Facility  

SciTech Connect (OSTI)

Air Products and Chemicals, Inc. has teamed with Plug Power, Inc. of Latham, NY, and the City of Las Vegas, NV, to develop, design, procure, install and operate an on-site hydrogen generation system, an alternative vehicle refueling system, and a stationary hydrogen fuel cell power plant, located in Las Vegas. The facility will become the benchmark for validating new natural gas-based hydrogen systems, PEM fuel cell power generation systems, and numerous new technologies for the safe and reliable delivery of hydrogen as a fuel to vehicles. Most important, this facility will serve as a demonstration of hydrogen as a safe and clean energy alternative. Las Vegas provides an excellent real-world performance and durability testing environment.

Edward F. Kiczek

2007-08-31T23:59:59.000Z

73

Next Generation Bipolar Plates for Automotive PEM Fuel Cells  

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

Bipolar Plates for Automotive PEM Fuel Cells (Topic 4) GrafTech International, Ltd. * Funding DOE Cost Share Recipient Cost Share TOTAL 2,325,943 581,486 2,907,429 80% 20% 100%...

74

Development of Micro-structural Mitigation Strategies for PEM...  

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

R D P O W E R S Y S T E M S Development of Micro-structural Mitigation Strategies for PEM Fuel Cells: Morphological Simulation and Experimental Approaches DOE Fuel Cell Projects...

75

A liquid water management strategy for PEM fuel cell stacks  

E-Print Network [OSTI]

Gas and water management are key to achieving good performance from a PEM fuel cell stack. Previous experimentation had found, and this experimentation confirms, that one very effective method of achieving proper gas and water management is the use...

Van Nguyen, Trung; Knobbe, M. W.

2003-02-25T23:59:59.000Z

76

Advanced Cathode Catalysts and Supports for PEM Fuel Cells  

E-Print Network [OSTI]

1 Advanced Cathode Catalysts and Supports for PEM Fuel Cells Mark K. Debe 3M Company May 15, 2012 group) Project Management - 3M (A. Steinbach, M. Kurkowski, S. Hendricks, A. Hester, P. Kadera, G

77

Bootstrapping a Sustainable North American PEM Fuel Cell Industry...  

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

and fuel cell vehicles (Greene et al., 2008). The market for non-automotive PEM fuel cells, on the other hand, may be much closer to commercial viability (Stone, 2006)....

78

In situ PEM fuel cell water measurements  

SciTech Connect (OSTI)

Efficient PEM fuel cell performance requires effective water management. The materials used, their durability, and the operating conditions under which fuel cells run, make efficient water management within a practical fuel cell system a primary challenge in developing commercially viable systems. We present experimental measurements of water content within operating fuel cells. in response to operational conditions, including transients and freezing conditions. To help understand the effect of components and operations, we examine water transport in operating fuel cells, measure the fuel cell water in situ and model the water transport within the fuel cell. High Frequency Resistance (HFR), AC Impedance and Neutron imaging (using NIST's facilities) were used to measure water content in operating fuel cells with various conditions, including current density, relative humidity, inlet flows, flow orientation and variable GDL properties. Ice formation in freezing cells was also monitored both during operation and shut-down conditions.

Borup, Rodney L [Los Alamos National Laboratory; Mukundan, Rangachary [Los Alamos National Laboratory; Davey, John R [Los Alamos National Laboratory; Spendalow, Jacob S [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

79

Advanced Materials for PEM-Based Fuel Cell Systems  

SciTech Connect (OSTI)

Proton exchange membrane fuel cells (PEMFCs) are quickly becoming attractive alternative energy sources for transportation, stationary power, and small electronics due to the increasing cost and environmental hazards of traditional fossil fuels. Two main classes of PEMFCs include hydrogen/air or hydrogen/oxygen fuel cells and direct methanol fuel cells (DMFCs). The current benchmark membrane for both types of PEMFCs is Nafion, a perfluorinated sulfonated copolymer made by DuPont. Nafion copolymers exhibit good thermal and chemical stability, as well as very high proton conductivity under hydrated conditions at temperatures below 80 degrees C. However, application of these membranes is limited due to their high methanol permeability and loss of conductivity at high temperatures and low relative humidities. These deficiencies have led to the search for improved materials for proton exchange membranes. Potential PEMs should have good thermal, hydrolytic, and oxidative stability, high proton conductivity, selective permeability, and mechanical durability over long periods of time. Poly(arylene ether)s, polyimides, polybenzimidazoles, and polyphenylenes are among the most widely investigated candidates for PEMs. Poly(arylene ether)s are a promising class of proton exchange membranes due to their excellent thermal and chemical stability and high glass transition temperatures. High proton conductivity can be achieved through post-sulfonation of poly(arylene ether) materials, but this most often results in very high water sorption or even water solubility. Our research has shown that directly polymerized poly(arylene ether) copolymers show important advantages over traditional post-sulfonated systems and also address the concerns with Nafion membranes. These properties were evaluated and correlated with morphology, structure-property relationships, and states of water in the membranes. Further improvements in properties were achieved through incorporation of inorganic fillers, such as phosphotungstic acid and zirconium hydrogen phosphate. Block copolymers were also studied due to the possibility to achieve a desired combination of homopolymer properties as well as the unique morphologies that are possible with block copolymers. Bezoyl substituted poly(p-phenylene) blocks were combined with poly(arylene ether) blocks to merge the structural rigidity of the poly(p-phenylene) with the ductility and high protonic conductivity of the poly(arylene ether)s. As evidenced by our many refereed publications and preprints, the research that we have conducted over the past several years has made a valuable and significant contribution to the literature and to the state of understanding of proton exchange membranes. Our early efforts at scale-up have suggested that the directly polymerized disulfonated poly(arylene ether sulfone) copolymers are commercially viable alternatives for proton exchange membranes. A new process for bipolar plates was developed and is described. An important single domain PEMFC model was developed and is documented in herein.

James E. McGrath; Donald G. Baird; Michael von Spakovsky

2005-10-26T23:59:59.000Z

80

Advanced Materials for PEM-Based Fuel Cell Systems  

SciTech Connect (OSTI)

Proton exchange membrane fuel cells (PEMFCs) are quickly becoming attractive alternative energy sources for transportation, stationary power, and small electronics due to the increasing cost and environmental hazards of traditional fossil fuels. Two main classes of PEMFCs include hydrogen/air or hydrogen/oxygen fuel cells and direct methanol fuel cells (DMFCs). The current benchmark membrane for both types of PEMFCs is Nafion, a perfluorinated sulfonated copolymer made by DuPont. Nafion copolymers exhibit good thermal and chemical stability, as well as very high proton conductivity under hydrated conditions at temperatures below 80 �������������������������������°C. However, application of these membranes is limited due to their high methanol permeability and loss of conductivity at high temperatures and low relative humidities. These deficiencies have led to the search for improved materials for proton exchange membranes. Potential PEMs should have good thermal, hydrolytic, and oxidative stability, high proton conductivity, selective permeability, and mechanical durability over long periods of time. Poly(arylene ether)s, polyimides, polybenzimidazoles, and polyphenylenes are among the most widely investigated candidates for PEMs. Poly(arylene ether)s are a promising class of proton exchange membranes due to their excellent thermal and chemical stability and high glass transition temperatures. High proton conductivity can be achieved through post-sulfonation of poly(arylene ether) materials, but this most often results in very high water sorption or even water solubility. Our research has shown that directly polymerized poly(arylene ether) copolymers show important advantages over traditional post-sulfonated systems and also address the concerns with Nafion membranes. These properties were evaluated and correlated with morphology, structure-property relationships, and states of water in the membranes. Further improvements in properties were achieved through incorporation of inorganic fillers, such as phosphotungstic acid and zirconium hydrogen phosphate. Block copolymers were also studied due to the possibility to achieve a desired combination of homopolymer properties as well as the unique morphologies that are possible with block copolymers. Bezoyl substituted poly(p-phenylene) blocks were combined with poly(arylene ether) blocks to merge the structural rigidity of the poly(p-phenylene) with the ductility and high protonic conductivity of the poly(arylene ether)s. As evidenced by our many refereed publications and preprints, the research that we have conducted over the past several years has made a valuable and significant contribution to the literature and to the state of understanding of proton exchange membranes. Our early efforts at scale-up have suggested that the directly polymerized disulfonated poly(arylene ether sulfone) copolymers are commercially viable alternatives for proton exchange membranes. A new process for bipolar plates was developed and is described. An important single domain PEMFC model was developed and is documented in this final report.

James E. McGrath

2005-10-26T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Final Report - MEA and Stack Durability for PEM Fuel Cells  

SciTech Connect (OSTI)

Proton exchange membrane fuel cells are expected to change the landscape of power generation over the next ten years. For this to be realized one of the most significant challenges to be met for stationary systems is lifetime, where 40,000 hours of operation with less than 10% decay is desired. This project conducted fundamental studies on the durability of membrane electrode assemblies (MEAs) and fuel cell stack systems with the expectation that knowledge gained from this project will be applied toward the design and manufacture of MEAs and stack systems to meet DOE’s 2010 stationary fuel cell stack systems targets. The focus of this project was PEM fuel cell durability – understanding the issues that limit MEA and fuel cell system lifetime, developing mitigation strategies to address the lifetime issues and demonstration of the effectiveness of the mitigation strategies by system testing. To that end, several discoveries were made that contributed to the fundamental understanding of MEA degradation mechanisms. (1) The classically held belief that membrane degradation is solely due to end-group “unzipping” is incorrect; there are other functional groups present in the ionomer that are susceptible to chemical attack. (2) The rate of membrane degradation can be greatly slowed or possibly eliminated through the use of additives that scavenge peroxide or peroxyl radicals. (3) Characterization of GDL using dry gases is incorrect due to the fact that fuel cells operate utilizing humidified gases. The proper characterization method involves using wet gas streams and measuring capillary pressure as demonstrated in this project. (4) Not all Platinum on carbon catalysts are created equally – the major factor impacting catalyst durability is the type of carbon used as the support. (5) System operating conditions have a significant impact of lifetime – the lifetime was increased by an order of magnitude by changing the load profile while all other variables remain the same. (6) Through the use of statistical lifetime analysis methods, it is possible to develop new MEAs with predicted durability approaching the DOE 2010 targets. (7) A segmented cell was developed that extend the resolution from ~ 40 to 121 segments for a 50cm2 active area single cell which allowed for more precise investigation of the local phenomena in a operating fuel cell. (8) The single cell concept was extended to a fuel size stack to allow the first of its kind monitoring and mapping of an operational fuel cell stack. An internal check used during this project involved evaluating the manufacturability of any new MEA component. If a more durable MEA component was developed in the lab, but could not be scaled-up to ‘high speed, high volume manufacturing’, then that component was not selected for the final MEA-fuel cell system demonstration. It is the intent of the team to commercialize new products developed under this project, but commercialization can not occur if the manufacture of said new components is difficult or if the price is significantly greater than existing products as to make the new components not cost competitive. Thus, the end result of this project is the creation of MEA and fuel cell system technology that is capable of meeting the DOEs 2010 target of 40,000 hours for stationary fuel cell systems (although this lifetime has not been demonstrated in laboratory or field testing yet) at a cost that is economically viable for the developing fuel cell industry. We have demonstrated over 2,000 hours of run time for the MEA and system developed under this project.

Yandrasits, Michael A.

2008-02-15T23:59:59.000Z

82

Free air breathing planar PEM fuel cell design for portable electronics  

E-Print Network [OSTI]

PEM fuel cell technology is an energy source that can provide several times more energy per unit volume then current lithium ion batteries. However, PEM fuel cells remain to be optimized in volume and mass to create a ...

Crumlin, Ethan J

2005-01-01T23:59:59.000Z

83

A Total Cost of Ownership Model for Low Temperature PEM Fuel...  

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

A Total Cost of Ownership Model for Low Temperature PEM Fuel Cells in Combined Heat and Power and Backup Power Applications A Total Cost of Ownership Model for Low Temperature PEM...

84

Mass Production Cost Estimation of Direct H2 PEM Fuel Cell Systems...  

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

Mass Production Cost Estimation of Direct H2 PEM Fuel Cell Systems for Transportation Applications: 2013 Update Mass Production Cost Estimation of Direct H2 PEM Fuel Cell Systems...

85

Vessel Cold-Ironing Using a Barge Mounted PEM Fuel Cell: Project...  

Office of Environmental Management (EM)

Vessel Cold-Ironing Using a Barge Mounted PEM Fuel Cell: Project Scoping and Feasibility Vessel Cold-Ironing Using a Barge Mounted PEM Fuel Cell: Project Scoping and Feasibility...

86

Method of monitoring CO concentrations in hydrogen feed to a PEM fuel cell  

DOE Patents [OSTI]

The CO concentration in the H.sub.2 feed stream to a PEM fuel cell stack is monitored by measuring current and/or voltage behavior patterns from a PEM-probe communicating with the reformate feed stream. Pattern recognition software may be used to compare the current and voltage patterns from the PEM-probe to current and voltage telltale outputs determined from a reference cell similar to the PEM-probe and operated under controlled conditions over a wide range of CO concentrations in the H.sub.2 fuel stream. The PEM-probe is intermittently purged of any CO build-up on the anode catalyst (e.g., by (1) flushing the anode with air, (2) short circuiting the PEM-probe, or (3) reverse biasing the PEM-probe) to keep the PEM-probe at peak performance levels.

Grot, Stephen Andreas (Rochester, NY); Meltser, Mark Alexander (Pittsford, NY); Gutowski, Stanley (Pittsford, NY); Neutzler, Jay Kevin (Rochester, NY); Borup, Rodney Lynn (East Rochester, NY); Weisbrod, Kirk (Los Alamos, NM)

2000-01-01T23:59:59.000Z

87

Forecasting the Costs of Automotive PEM Fuel Cell Systems: Using Bounded Manufacturing Progress Functions  

E-Print Network [OSTI]

the manufactunng costs of fuel cells systems from presentlevel and manufactunng cost of PEM fuel cell systems, for amthe present cost cf PEM fuel cell systems by consldenng a

Lipman, Timonthy E.; Sperling, Daniel

2001-01-01T23:59:59.000Z

88

Design of graphene sheets-supported Pt catalyst layer in PEM...  

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

graphene sheets-supported Pt catalyst layer in PEM fuel cells. Design of graphene sheets-supported Pt catalyst layer in PEM fuel cells. Abstract: A series of cathodes using Pt...

89

Heat and Mass Transfer Modeling of Dry Gases in the Cathode of PEM Fuel Cells  

E-Print Network [OSTI]

Heat and Mass Transfer Modeling of Dry Gases in the Cathode of PEM Fuel Cells M.J. Kermani1 J and N2, through the cathode of a proton exchange membrane (PEM) fuel cell is studied numerically) an energy equation, written in a form that has enthalpy as the dependent variable. Keywords: PEM fuel cells

Stockie, John

90

Fuel Cells for Transportation FY 2001 Progress Report V. PEM STACK COMPONENT COST REDUCTION1  

E-Print Network [OSTI]

Fuel Cells for Transportation FY 2001 Progress Report 113 V. PEM STACK COMPONENT COST REDUCTION1 A. High-Performance, Matching PEM Fuel Cell Components and Integrated Pilot Manufacturing Processes Mark K polymer electrolyte membrane (PEM) fuel cell components and pilot manufacturing processes to facilitate

91

Degradation Characteristics of Elastomeric Gasket Materials in a Simulated PEM Fuel Cell Environment  

E-Print Network [OSTI]

Degradation Characteristics of Elastomeric Gasket Materials in a Simulated PEM Fuel Cell; in revised form December 9, 2007) Polymer electrolyte membrane (PEM) fuel cell stack requires gaskets after exposure to the simulated PEM fuel cell environment over time. Keywords ATR-FTIR, degradation

Van Zee, John W.

92

MODELING THE EFFECT OF FLOW FIELD DESIGN ON PEM FUEL CELL PERFORMANCE  

E-Print Network [OSTI]

MODELING THE EFFECT OF FLOW FIELD DESIGN ON PEM FUEL CELL PERFORMANCE Jeffrey Glandt, Sirivatch University of South Carolina Columbia, SC 29208 vanzee@engr.sc.edu Key words: PEM fuel cell, flow field or printed in its publications. #12;2 MODELING THE EFFECT OF FLOW FIELD DESIGN ON PEM FUEL CELL PERFORMANCE

Van Zee, John W.

93

Performance and endurance of a high temperature PEM fuel cell operated on methanol reformate  

E-Print Network [OSTI]

Performance and endurance of a high temperature PEM fuel cell operated on methanol reformate Samuel September 2014 Available online xxx Keywords: High temperature PEM Fuel cell Methanol Impedance spectroscopy]. The report forecasts even more success for fuel cells in the near future. Proton exchange membrane (PEM) fuel

Kær, Søren Knudsen

94

Thermal modeling and temperature control of a PEM fuel cell system for forklift applications  

E-Print Network [OSTI]

Thermal modeling and temperature control of a PEM fuel cell system for forklift applications simulation System modeling and control PEMFC a b s t r a c t Temperature changes in PEM fuel cell stacks. Stack thermal management and control are, thus, crucial issues in PEM fuel cell systems especially

Berning, Torsten

95

Modeling and simulation of a reformate supplied PEM fuel cell stack, application to fault detection  

E-Print Network [OSTI]

Modeling and simulation of a reformate supplied PEM fuel cell stack, application to fault detection exchange membrane (PEM) fuel cells are the main type of fuel cell developed for ground vehicle applications tool for thermal characteristic and fault detection of a PEM fuel cell stack. The fuel cell stack model

Paris-Sud XI, Université de

96

Active Water Management for PEM Fuel Cells Shawn Litster, Cullen R. Buie, Tibor Fabian,  

E-Print Network [OSTI]

Active Water Management for PEM Fuel Cells Shawn Litster, Cullen R. Buie, Tibor Fabian, John K, California 94305, USA Proton exchange membrane PEM fuel cells require humidified gases to maintain proper challenge for polymer electro- lyte membrane PEM fuel cells with perfluorosulfonic acid PFSA type membranes

Santiago, Juan G.

97

Accepted Manuscript Title: Advanced computational tools for pem fuel cell design  

E-Print Network [OSTI]

Accepted Manuscript Title: Advanced computational tools for pem fuel cell design ­ Part 1.C. Sui, S. Kumar, N. Djilali, Advanced computational tools for pem fuel cell design ­ Part 1: Development TOOLS FOR PEM FUEL CELL DESIGN ­ Part 1: Development and Base Case Simulations P.C. Sui , S. Kumar and N

Djilali, Ned

98

Sputter-Deposited Pt PEM Fuel Cell Electrodes: Particles vs M. D. Gasda,a  

E-Print Network [OSTI]

Sputter-Deposited Pt PEM Fuel Cell Electrodes: Particles vs Layers M. D. Gasda,a R. Teki,b T.-M. Lu as cathode electrodes in proton exchange membrane PEM fuel cells using Nafion 1135 membranes and Teflon, 2009. Published March 24, 2009. Polymer electrolyte membrane or proton exchange membrane PEM fuel cells

Gall, Daniel

99

Pt/CARBON XEROGEL CATALYSTS FOR PEM FUEL CELLS Nathalie JOBa  

E-Print Network [OSTI]

Pt/CARBON XEROGEL CATALYSTS FOR PEM FUEL CELLS Nathalie JOBa , Frédéric MAILLARDb , Jean of proton exchange membrane (PEM) fuel cells in order to decrease the mass transport limitations The catalytic layer configuration is a key-element in the design of PEM fuel cells [1]. Indeed, besides

Paris-Sud XI, Université de

100

Sensors for Safety & Performance Stationary Systems  

E-Print Network [OSTI]

for PEM Fuel Cell Vehicles · Interfacial Stability of Thin Film H2 Sensors · Sensors for Automotive Fuel Cell Systems · Micro-Machined Thin Film H2 Gas Sensors · Sensor Development for PEM Fuel Cell Systems for Fuel Cell Monitoring #12;Discussion Points Barriers ·Cost ·Application ·Lifetime ·Flexibility ·Public

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

In situ PEM fuel cell water measurements  

SciTech Connect (OSTI)

Efficient PEM (Polymer Electrolyte Membrane) fuel cell performance requires effective water management. To achieve a deeper understanding of water transport and performance issues associated with water management, we have conducted in situ water examinations to help understand the effects of components and operations. High Frequency Resistance (HFR), AC Impedance and Neutron imaging were used to measure water content in operating fuel cells, with various conditions, including current density, relative humidity, inlet flows, flow orientation and variable Gas Diffusion Layer (GDL) properties. High resolution neutron radiography was used to image fuel cells during a variety of conditions. The effect of specific operating conditions, including flow direction (co-flow or counter-flow) was examined. Counter-flow operation was found to result in higher water content than co-flow operation, which correlates to lower membrane resistivity. A variety of cells were used to quantify the membrane water in situ during exposure to saturated gases, during fuel cell operation, and during hydrogen pump operation. The quantitative results show lower membrane water content than previous results suggested.

Borup, Rodney L [Los Alamos National Laboratory; Mukundan, Rangachary [Los Alamos National Laboratory; Davey, John R [Los Alamos National Laboratory; Spendelow, Jacob S [Los Alamos National Laboratory; Hussey, Daniel S [NIST; Jacobson, David L [NIST; Arif, Muhammad [NIST

2009-01-01T23:59:59.000Z

102

Transportation and Stationary Power Integration: Workshop Proceedings...  

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

Integration: Workshop Proceedings Transportation and Stationary Power Integration: Workshop Proceedings Proceedings for the Transportation and Stationary Power Integration Workshop...

103

Recent Progress in Nanostructured Electrocatalysts for PEM Fuel Cells  

SciTech Connect (OSTI)

Polymer electrolyte membrane (PEM) fuel cells are attracting much attention as promising clean power sources and an alternative to conventional internal combustion engines, secondary batteries, and other power sources. Much effort from government laboratories, industry, and academia has been devoted to developing PEM fuel cells, and great advances have been achieved. Although prototype cars powered by fuel cells have been delivered, successful commercialization requires fuel cell electrocatalysts, which are crucial components at the heart of fuel cells, meet exacting performance targets. In this review, we present a brief overview of the recent progress in fuel cell electrocatalysts, which involves catalyst supports, Pt and Pt-based electrocatalysts, and non-Pt electrocatalysts.

Zhang, Sheng; Shao, Yuyan; Yin, Geping; Lin, Yuehe

2013-03-30T23:59:59.000Z

104

Ceramic stationary gas turbine  

SciTech Connect (OSTI)

The performance of current industrial gas turbines is limited by the temperature and strength capabilities of the metallic structural materials in the engine hot section. Because of their superior high-temperature strength and durability, ceramics can be used as structural materials for hot section components (blades, nozzles, combustor liners) in innovative designs at increased turbine firing temperatures. The benefits include the ability to increase the turbine inlet temperature (TIT) to about 1200{degrees}C ({approx}2200{degrees}F) or more with uncooled ceramics. It has been projected that fully optimized stationary gas turbines would have a {approx}20 percent gain in thermal efficiency and {approx}40 percent gain in output power in simple cycle compared to all metal-engines with air-cooled components. Annual fuel savings in cogeneration in the U.S. would be on the order of 0.2 Quad by 2010. Emissions reductions to under 10 ppmv NO{sub x} are also forecast. This paper describes the progress on a three-phase, 6-year program sponsored by the U.S. Department of Energy, Office of Industrial Technologies, to achieve significant performance improvements and emissions reductions in stationary gas turbines by replacing metallic hot section components with ceramic parts. Progress is being reported for the period September 1, 1994, through September 30, 1995.

Roode, M. van

1995-12-31T23:59:59.000Z

105

HT-PEM Fuel Cell System with Integrated Thermoelectric Exhaust  

E-Print Network [OSTI]

submitted to the Faculty of Engineering and Science at Aalborg University in partial fulfillment submitted for assessment in partial fulfilment of the PhD degree. The scientific #12;papers are not included the efficiency and the load- following capability of a high temperature polymer electrolyte membrane (HT- PEM

Berning, Torsten

106

Fiber Optic Temperature Sensor for PEM Fuel Cells  

E-Print Network [OSTI]

Fiber Optic Temperature Sensor for PEM Fuel Cells S.W. Allison, T.J. McIntyre, L.C. Maxey, M Objectives · Develop a low cost, robust temperature sensor for monitoring fuel cell condition and performance Hydrogren and Fuel Cells Merit Review Meeting May 19-22, 2003, Berkeley, California #12;Program Goals

107

Design and optimization of polymer electrolyte membrane (PEM) fuel cells  

E-Print Network [OSTI]

Design and optimization of polymer electrolyte membrane (PEM) fuel cells M. Grujicic* , K optimization algorithm to determine an optimum design of the fuel cell with respect to the operation difference has the largest effect on the predicted polarization curve of the fuel cell. However, the optimal

Grujicic, Mica

108

PEM FUEL CELL TECHNOLOGY Key Research Needs and Approaches  

E-Print Network [OSTI]

Developer University #12;8 FUEL CELL RESEARCH NEEDS MEA optimization should focus on new materials Pt (full1 PEM FUEL CELL TECHNOLOGY Key Research Needs and Approaches Tom Jarvi UTC Power South Windsor, CT 06074 23 January 2008 #12;2 UTC POWER MARKET FOCUS Transportation Fuel Cells On-Site Power Solutions #12

109

PSO project: 4760 High Temperature PEM Fuel Cell  

E-Print Network [OSTI]

PSO project: 4760 High Temperature PEM Fuel Cell Final report - Public part - #12;Project, Technical University of Denmark Partners: IRD Fuel Cells A/S Danish Power Systems Aps DONG Energy Authors, and a steady reduction of production cost is also desired (as in general for fuel cells). However, during

110

Data-stationary pipelined machine  

SciTech Connect (OSTI)

The paper presents the data-stationary control concept of pipelined machines, with emphasis on its application in image processing systems. A parallel array of pipelined machines for image processing is considered, and data-stationary control is compared with time-stationary control. A system is proposed that is a parallel array of pipelined machines. Each pipeline is a multifunctional, statically configured, data-stationary device. The pipelines do not accommodate branching instructions or interrupts, and the design focus on vector processing only. The system can be used in other applications such as signal processing and arithmetic number crunching. 5 references.

Abdou, I.E.

1984-01-01T23:59:59.000Z

111

Development of Novel PEM Membrane and Multiphase CD Modeling of PEM Fuel Cell  

SciTech Connect (OSTI)

To understand heat and water management phenomena better within an operational proton exchange membrane fuel cell's (PEMFC) conditions, a three-dimensional, two-phase computational fluid dynamic (CFD) flow model has been developed and simulated for a complete PEMFC. Both liquid and gas phases are considered in the model by taking into account the gas flow, diffusion, charge transfer, change of phase, electro-osmosis, and electrochemical reactions to understand the overall dynamic behaviors of species within an operating PEMFC. The CFD model is solved numerically under different parametric conditions in terms of water management issues in order to improve cell performance. The results obtained from the CFD two-phase flow model simulations show improvement in cell performance as well as water management under PEMFCs operational conditions as compared to the results of a single phase flow model available in the literature. The quantitative information obtained from the two-phase model simulation results helped to develop a CFD control algorithm for low temperature PEM fuel cell stacks which opens up a route in designing improvement of PEMFC for better operational efficiency and performance. To understand heat and water management phenomena better within an operational proton exchange membrane fuel cell's (PEMFC) conditions, a three-dimensional, two-phase computational fluid dynamic (CFD) flow model has been developed and simulated for a complete PEMFC. Both liquid and gas phases are considered in the model by taking into account the gas flow, diffusion, charge transfer, change of phase, electro-osmosis, and electrochemical reactions to understand the overall dynamic behaviors of species within an operating PEMFC. The CFD model is solved numerically under different parametric conditions in terms of water management issues in order to improve cell performance. The results obtained from the CFD two-phase flow model simulations show improvement in cell performance as well as water management under PEMFCs operational conditions as compared to the results of a single phase flow model available in the literature. The quantitative information obtained from the two-phase model simulation results helped to develop a CFD control algorithm for low temperature PEM fuel cell stacks which opens up a route in designing improvement of PEMFC for better operational efficiency and performance.

K. J. Berry; Susanta Das

2009-12-30T23:59:59.000Z

112

Universal Membrane Classification Scheme: Maximizing the Return on High Temperature PEM Membrane Research  

Broader source: Energy.gov [DOE]

This presentation on maximizing the return of high temperature PEM membrane research was given at the High Temperature Membrane Working Group Meeting in May 2007.

113

Webinar: Hydrogen Production by Polymer Electrolyte Membrane (PEM) Electrolysis—Spotlight on Giner and Proton  

Broader source: Energy.gov [DOE]

Video recording of the webinar, Hydrogen Production by Polymer Electrolyte Membrane (PEM) Electrolysis—Spotlight on Giner and Proton, originally presented on May 23, 2011.

114

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems...  

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

Application Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Application This report estimates fuel cell system cost for systems produced in the...

115

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems...  

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

07 Update Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Applications: 2007 Update This report estimates fuel cell system cost for systems...

116

Optimization of channel geometry in a proton exchange membrane (PEM) fuel cell.  

E-Print Network [OSTI]

??Bipolar plates are the important components of the PEM fuel cell. The flow distribution inside the bipolar plate should be uniform. Non-uniform flow distribution inside… (more)

Kasukurthi, Jephanya

2009-01-01T23:59:59.000Z

117

Dynamic characteristics of a commercial Proton Exchange Membrane (PEM) fuel cell.  

E-Print Network [OSTI]

??Fast growing application of Proton Exchange Membrane (PEM) Fuel Cell in automotive industries, has brought the necessity of conducting research on automotive aspects of the… (more)

Toutounchian, Hamid

2008-01-01T23:59:59.000Z

118

Convection-type PEM fuel cell control system performance testing and modeling.  

E-Print Network [OSTI]

??The PEM (Polymer Electrolyte Membrane) fuel cell is a promising technology for mobile applications because of its compactness, low operating temperature, and quick startup time.… (more)

Hoy, Jeannette M.

2008-01-01T23:59:59.000Z

119

Lateral Current Density Variation in PEM Fuel Cells with Interdigitated Flow Fields.  

E-Print Network [OSTI]

??Proton exchange membrane (PEM) fuel cell is regarded as one of the most promising power systems for the future vehicles. When supplied with air and… (more)

Luo, Song

2014-01-01T23:59:59.000Z

120

Modeling and simulation for a PEM fuel cell with catalyst layers in finite thickness.  

E-Print Network [OSTI]

??A detailed non-isothermal computational fluid dynamics (CFD) model for proton electrolyte membrane (PEM) fuel cells is developed in this thesis. This model consists of the… (more)

Yin, Jianghui (Author)

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

SYNTHESIS, CHARACTERIZATION AND PERFORMANCE TESTING OF PT- BASED ELECTROCATALYSTS FOR LOW TEMPERATURE PEM FUEL CELLS.  

E-Print Network [OSTI]

??The oxygen reduction reaction (ORR) activity on the cathode plays a significant role in deciding the overall performance of proton exchange membrane (PEM) fuel cells.… (more)

Gong, Yanming

2008-01-01T23:59:59.000Z

122

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems...  

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

Application Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Application This presentation reports on the status of mass production cost...

123

Upcoming Webinar November 19: Micro-Structural Mitigation Strategies for PEM Fuel Cells  

Broader source: Energy.gov [DOE]

On November 19, the Energy Department will present a webinar on micro-structural mitigation strategies for PEM fuel cells focusing on morphological simulations and experimental approaches.

124

Transportation and Stationary Power Integration Workshop Attendees...  

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

Attendees List Transportation and Stationary Power Integration Workshop Attendees List List of attendees for the Transportation and Stationary Power Integration Workshop...

125

Stationary distributions of continuous time Markov chains  

E-Print Network [OSTI]

Apr 13, 2012 ... stationary distribution as the limiting fraction of time spent in states. 1 Stationary measures in continuous time. The following theorem is an ...

2012-04-13T23:59:59.000Z

126

WaterTransport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing and Design Optimization  

SciTech Connect (OSTI)

Water management in Proton Exchange Membrane, PEM, Fuel Cells is challenging because of the inherent conflicts between the requirements for efficient low and high power operation. Particularly at low powers, adequate water must be supplied to sufficiently humidify the membrane or protons will not move through it adequately and resistance losses will decrease the cell efficiency. At high power density operation, more water is produced at the cathode than is necessary for membrane hydration. This excess water must be removed effectively or it will accumulate in the Gas Diffusion Layers, GDLs, between the gas channels and catalysts, blocking diffusion paths for reactants to reach the catalysts and potentially flooding the electrode. As power density of the cells is increased, the challenges arising from water management are expected to become more difficult to overcome simply due to the increased rate of liquid water generation relative to fuel cell volume. Thus, effectively addressing water management based issues is a key challenge in successful application of PEMFC systems. In this project, CFDRC and our partners used a combination of experimental characterization, controlled experimental studies of important processes governing how water moves through the fuel cell materials, and detailed models and simulations to improve understanding of water management in operating hydrogen PEM fuel cells. The characterization studies provided key data that is used as inputs to all state-of-the-art models for commercially important GDL materials. Experimental studies and microscopic scale models of how water moves through the GDLs showed that the water follows preferential paths, not branching like a river, as it moves toward the surface of the material. Experimental studies and detailed models of water and airflow in fuel cells channels demonstrated that such models can be used as an effective design tool to reduce operating pressure drop in the channels and the associated costs and weight of blowers and pumps to force air and hydrogen gas through the fuel cell. Promising improvements to materials structure and surface treatments that can potentially aid in managing the distribution and removal of liquid water were developed; and improved steady-state and freeze-thaw performance was demonstrated for a fuel cell stack under the self-humidified operating conditions that are promising for stationary power generation with reduced operating costs.

J. Vernon Cole; Abhra Roy; Ashok Damle; Hari Dahr; Sanjiv Kumar; Kunal Jain; Ned Djilai

2012-10-02T23:59:59.000Z

127

Development of a lithium hydride powered hydrogen generator for use in long life, low power PEM fuel cell power supplies  

E-Print Network [OSTI]

This thesis studies a hybrid PEM fuel cell system for use in low power, long life sensor networks. PEM fuel cells offer high efficiency and environmental friendliness but have not been widely adopted due to cost, reliability, ...

Strawser, Daniel DeWitt

2012-01-01T23:59:59.000Z

128

Stationary Fuel Cell Evaluation (Presentation)  

SciTech Connect (OSTI)

This powerpoint presentation discusses its objectives: real world operation data from the field and state-of-the-art lab; collection; analysis for independent technology validation; collaboration with industry and end users operating stationary fuel cell systems and reporting on technology status, progress and technical challenges. The approach and accomplishments are: A quarterly data analysis and publication of first technical stationary fuel cell composite data products (data through June 2012).

Kurtz, J.; Wipke, K.; Sprik, S.; Ramsden, T.; Ainscough, C.

2012-05-01T23:59:59.000Z

129

Design and Control of High Temperature PEM Fuel Cell Systems using Methanol Reformers with Air or Liquid Heat Integration  

E-Print Network [OSTI]

Design and Control of High Temperature PEM Fuel Cell Systems using Methanol Reformers with Air PEM fuel cell systems fuelled by steam reformed methanol. Various fuel cell system solutions exist, they mainly differ depending on the desired fuel used. High temperature PEM (HTPEM) fuel cells offer

Berning, Torsten

130

Condensation in the Cathode of a PEM Fuel Cell M. J. Kermani J. M. Stockie A. G. Gerber  

E-Print Network [OSTI]

Condensation in the Cathode of a PEM Fuel Cell M. J. Kermani J. M. Stockie A. G. Gerber University@unb.ca. ABSTRACT Three species condensing flow in the cathode of a Proton Exchange Membrane (PEM) fuel cell of an ongoing effort to carefully model individual elements of the PEM fuel cell, with a par- ticular focus

Stockie, John

131

Quantification of Liquid Water Saturation in a PEM Fuel Cell Diffusion Medium Using X-ray Microtomography  

E-Print Network [OSTI]

Quantification of Liquid Water Saturation in a PEM Fuel Cell Diffusion Medium Using X understanding of the two-phase flow and flooding occurrence in proton exchange membrane PEM fuel cells. We have as ice formation during cold start of PEM fuel cells. The water present in these porous layers

132

A single-phase, non-isothermal model for PEM fuel cells Hyunchul Ju, Hua Meng, Chao-Yang Wang *  

E-Print Network [OSTI]

A single-phase, non-isothermal model for PEM fuel cells Hyunchul Ju, Hua Meng, Chao-Yang Wang October 2004 Available online 8 December 2004 Abstract A proton exchange membrane (PEM) fuel cell produces a comprehensive study of thermal and water management in PEM fuel cells. Numerical simulations reveal

133

Nanorod PEM Fuel Cell Cathodes with Controlled Porosity M. D. Gasda, G. A. Eisman,* and D. Gallz  

E-Print Network [OSTI]

Nanorod PEM Fuel Cell Cathodes with Controlled Porosity M. D. Gasda, G. A. Eisman,* and D. Gallz as cathode electrodes in proton exchange membrane PEM fuel cells. Deposition on flat substrates yields February 4, 2010. Proton exchange membrane PEM fuel cells are promising for future automotive applications

Gall, Daniel

134

Sputter-Deposited Pt/CrN Nanoparticle PEM Fuel Cell Cathodes: Limited Proton Conductivity Through Electrode  

E-Print Network [OSTI]

Sputter-Deposited Pt/CrN Nanoparticle PEM Fuel Cell Cathodes: Limited Proton Conductivity Through for proton exchange membrane PEM fuel cells. X-ray diffraction and scanning electron microscopy show manuscript received September 17, 2009. Published November 13, 2009. Proton exchange membrane PEM fuel cells

Gall, Daniel

135

Dynamic Thermal Model of Polymer Electrolyte Membrane (PEM) Fuel Cell Budi Hadisujoto, Rehan Refai, Dongmei Chen, Tess J. Moon  

E-Print Network [OSTI]

Dynamic Thermal Model of Polymer Electrolyte Membrane (PEM) Fuel Cell Budi Hadisujoto, Rehan Refai to improve the performance of a PEM fuel cell Simulation Results Advanced Power Systems and Controls (GDL) to reduce water saturation · Model water transport in PEM fuel cell Contribution: · Dynamic

Ben-Yakar, Adela

136

Constructal flow structure for a PEM fuel cell J.V.C. Vargas a,*, J.C. Ordonez b  

E-Print Network [OSTI]

Constructal flow structure for a PEM fuel cell J.V.C. Vargas a,*, J.C. Ordonez b , A. Bejan c the internal structure (relative sizes, spacings) and external shape (aspect ratios) of a unit PEM fuel cell so) level of a fuel cell stack, i.e., the unit PEM fuel cell, which is modeled as a unidirectional flow

Ordonez, Juan C.

137

Prognostics of PEM fuel cell in a particle filtering framework Marine Jouin  

E-Print Network [OSTI]

Prognostics of PEM fuel cell in a particle filtering framework Marine Jouin , Rafael Gouriveau.jouin@femto-st.fr Abstract Proton Exchange Membrane Fuel Cells (PEMFC) suffer from a limited lifespan, which impedes of the proposed approach. Keywords: Proton exchange membrane (PEM) fuel cell, Prognostics, Remaining useful life

Paris-Sud XI, Université de

138

Experimental evaluation of cell temperature effects on miniature, air-breathing PEM fuel cells  

E-Print Network [OSTI]

Experimental evaluation of cell temperature effects on miniature, air-breathing PEM fuel cells Z June 2011 Available online 14 June 2011 Keywords: Air-breathing PEM fuel cell Temperature effects Air) fuel cells is investi- gated using polarization and impedance spectroscopy. Three active area sizes

Lee, Tonghun

139

Odne Stokke Burheim Thermal Signature and Thermal Conductivities of PEM Fuel Cells  

E-Print Network [OSTI]

Odne Stokke Burheim Thermal Signature and Thermal Conductivities of PEM Fuel Cells Thesis-Holst for believing in me and for giving me the opportunity to join the work on the "Thermal Effects in Fuel cell The work presented here gives estimates on thermal gradients within the PEM fuel cell, an experimental

Kjelstrup, Signe

140

A non-isothermal PEM fuel cell model including two water transport mechanisms in the  

E-Print Network [OSTI]

A non-isothermal PEM fuel cell model including two water transport mechanisms in the membrane K Freiburg Germany A dynamic two-phase flow model for proton exchange mem- brane (PEM) fuel cells and the species concentrations. In order to describe the charge transport in the fuel cell the Poisson equations

Münster, Westfälische Wilhelms-Universität

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Carbon Corrosion in PEM Fuel Cell Dead-Ended Anode Jixin Chen,*,z  

E-Print Network [OSTI]

Carbon Corrosion in PEM Fuel Cell Dead-Ended Anode Operations Jixin Chen,*,z Jason B. Siegel on the electrode carbon corrosion of the Proton Exchange Membrane (PEM) fuel cell. A reduced order isothermal model. This model explains, and can be used to quantify, the carbon corrosion behavior dur- ing DEA operation

Stefanopoulou, Anna

142

Estimation of CO concentration in high temperature PEM fuel cells using electrochemical impedance spectroscopy  

E-Print Network [OSTI]

Estimation of CO concentration in high temperature PEM fuel cells using electrochemical impedance (Numbers are presented in Tian et al. (2010)) and cost effectiveness (Price development for Fuel Cells / grid during the test. Efforts have been made in increasing operating temperatures of PEM fuel cells

Berning, Torsten

143

Mass Production Cost Estimation of Direct H2 PEM Fuel Cell Systems for  

E-Print Network [OSTI]

1 Mass Production Cost Estimation of Direct H2 PEM Fuel Cell Systems for Transportation (2012), annually updated costs analyses will be conducted for PEM fuel cell passenger buses as well established detailed cost targets for automotive fuel cell systems and components. To help achieve

144

The Effect of Slip Velocity on Saturation for Multiphase Condensing Mixtures in a PEM Fuel Cell  

E-Print Network [OSTI]

The Effect of Slip Velocity on Saturation for Multiphase Condensing Mixtures in a PEM Fuel Cell in computed results reported in the fuel cell literature, but which has not yet received a satisfactory to treat the slip velocity between phases. Keywords: Condensation ­ Two Phase Flow ­ PEM Fuel Cell ­ Slip

Stockie, John

145

Forecasting the Costs of Automotive PEM Fuel Cell Systems: Using Bounded Manufacturing Progress Functions  

E-Print Network [OSTI]

fuel cell stacks (Savote (1998)) Estimating manufactunng costfuel cell stacks, $20/kWfor fuel processors, and $20/kWfor "balance of plant" auxlhary components These costCosts of Automotive PEM Fuel Cell Systems (PEM)fuel cell stack

Lipman, Timonthy E.; Sperling, Daniel

2001-01-01T23:59:59.000Z

146

Sulfonated Polysulfone/POSS Nanofiber Composite Membranes for PEM Fuel Cells  

E-Print Network [OSTI]

Sulfonated Polysulfone/POSS Nanofiber Composite Membranes for PEM Fuel Cells Jonghyun Choi. Historically, most of the research work on Nafion replacements for proton exchange membrane PEM fuel cells has in H2/air fuel cells that operate at low humidity. The membranes were fabricated from electrospun

Mather, Patrick T.

147

Effect of electrode configuration and electronic conductivity on current density distribution measurements in PEM fuel cells  

E-Print Network [OSTI]

EFFECT OF ELECTRODE CONFIGURATION AND ELECTRONIC CONDUCTIVITY ON CURRENT DENSITY DISTRIBUTION MEASUREMENTS IN PEM FUEL CELLS by Dilip Natarajan and Trung Van Nguyen* Department of Chemical and Petroleum Engineering University of Kansas... words: PEM fuel cells, conventional gas distributor, current density distribution, segmented electrode, mathematical modeling * Author to whom correspondence should be addressed ABSTRACT Current density and potential distribution measurements...

Natarajan, Dilip; Nguyen, Trung Van

2004-09-03T23:59:59.000Z

148

Fuzzy Logic-Based State-of-Health Determination of PEM Craig Fennie and David Reisner  

E-Print Network [OSTI]

and increasing their development efforts to reduce the cost of fuel cell stacks, preparing for introductionFuzzy Logic-Based State-of-Health Determination of PEM Fuel Cells Craig Fennie and David Reisner US University Villanova, PA 19085 Abstract Proton exchange membrane (PEM) fuel cells are being rapidly developed

Singh, Pritpal

149

The Effect of Reformate on PEM Fuel Cell Performance Mahesh Murthy  

E-Print Network [OSTI]

Exchanged Membrane (PEM) fuel cells in a "hydrogen-challenged" economy, hydrogen can be produced contains about 35 - 40 % hydrogen [1]. The effects of reformate fuel on the performance of PEM fuel cells in hydrogen for a laboratory polymer electrolyte membrane fuel cell [3, 4]. In these earlier studies

Van Zee, John W.

150

Novel Hydrogen Purification Device Integrated with PEM Fuel Cells  

SciTech Connect (OSTI)

A prototype device containing twelve membrane tubes was designed, built, and demonstrated. The device produced almost 300 scfh of purified hydrogen at 200 psig feed pressure. The extent of purification met the program target of selectively removing enough impurities to enable industrial-grade hydrogen to meet purity specifications for PEM fuel cells. An extrusion process was developed to produce substrate tubes. Membranes met several test objectives, including completing 20 thermal cycles, exceeding 250 hours of operating life, and demonstrating a flux of 965 scfh/ft2 at 200 psid and 400 C.

Joseph Schwartz; Hankwon Lim; Raymond Drnevich

2010-12-31T23:59:59.000Z

151

Techno-economic Analysis of PEM Electrolysis for Hydrogen Production  

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 RankCombustion |Energy Usage »of Energy StrainClientDesignOffice - 20142012 | PEM Electrolysis for

152

Low Temperature PEM Fuel Cell Manufacturing Needs | 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:Year in3.pdfEnergy Health andofIanJenniferLeslieEnergy LoanOfficial Dr.TechnicalLowLowPEM

153

95TILING FOR STATIONARY METHODS SPARSE TILING FOR STATIONARY  

E-Print Network [OSTI]

­Seidel operating on sparse matrices. In scientific applications such as finite element analysis, these itera- tive of stationary iterative methods operating on sparse matrices. In scientific appli- cations, such as finite element analysis (FEA), these iter- ative methods dominate the execution time. FEA is a numerical

Strout, Michelle Mills

154

Hydrogen PEM Fuel Cells: A Market Need Provides Research Opportunities  

SciTech Connect (OSTI)

It has been said that necessity is the mother of invention. Another way this can be stated is that market demands create research opportunities. Because of the increasing demand for oil (especially for fueling vehicles utilizing internal combustion engines) and the fact that oil is a depleting (not renewable) energy source, a market need for a renewable source of energy has created significant opportunities for research. This paper addresses the research opportunities associated with producing a market competitive (i.e., high performance, low cost and durable) hydrogen proton exchange membrane (PEM) fuel cell. Of the many research opportunities, the primary ones to be addressed directly are: Alternative membrane materials, Alternative catalysts, Impurity effects, and Water transport. A status of Department of Energy-sponsored research in these areas will be summarized and the impact of each on the ability to develop a market-competitive hydrogen PEM fuel cell powered vehicle will be discussed. Also, activities of the International Partnership for the Hydrogen Economy in areas such as advanced membranes for fuel cells and materials for storage will be summarized.

Payne, Terry L [ORNL; Brown, Gilbert M [ORNL; Bogomolny, David [Sentech, Inc.

2010-01-01T23:59:59.000Z

155

Distributed/Stationary Fuel Cell Systems | Department of Energy  

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

DistributedStationary Fuel Cell Systems DistributedStationary Fuel Cell Systems Photo of stationary fuel cell The Department of Energy (DOE) is developing high-efficiency fuel...

156

Stationary Fuel Cells: Overview of Hydrogen and Fuel Cell Activities...  

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

Stationary Fuel Cells: Overview of Hydrogen and Fuel Cell Activities Stationary Fuel Cells: Overview of Hydrogen and Fuel Cell Activities Presentation covers stationary fuel cells...

157

Vessel Cold-Ironing Using a Barge Mounted PEM Fuel Cell: Project...  

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

Unlimited Release Printed February 2013 Vessel Cold-Ironing Using a Barge Mounted PEM Fuel Cell: Project Scoping and Feasibility Joseph W. Pratt and Aaron P. Harris Prepared by...

158

A Total Cost of Ownership Model for Low Temperature PEM Fuel...  

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

LBNL-6772E A Total Cost of Ownership Model for Low Temperature PEM Fuel Cells in Combined Heat and Power and Backup Power Applications Max Wei, Timothy Lipman 1 , Ahmad Mayyas 1 ,...

159

FREEWAY PERFORMANCE MEASUREMENT SYSTEM (PeMS): AN OPERATIONAL ANALYSIS TOOL  

E-Print Network [OSTI]

and calibrate simulation models. The paper describes the use of PeMS in conducting operational analysis from case studies on conducting freeway operational analyses, bottleneck identification, Level and researchers in conducting freeway operational analyses, bottleneck identification, determining the Level

Varaiya, Pravin

160

Cost Analysis of PEM Fuel Cell Systems for Transportation: September 30, 2005  

SciTech Connect (OSTI)

The results of sensitivity and Monte Carlo analyses on PEM fuel cell components and the overall system are presented including the most important cost factors and the effects of selected scenarios.

Carlson, E. J.; Kopf, P.; Sinha, J.; Sriramulu, S.; Yang, Y.

2005-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems...  

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

Application: 2009 Update Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Application: 2009 Update This report is the third annual update of a...

162

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems...  

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

10 Update Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Applications: 2010 Update This report is the fourth annual update of a comprehensive...

163

Effect of Hydrogen Inlets on Planar μPEM Fuel Cell Stacks.  

E-Print Network [OSTI]

??Planar μPEM Fuel Cell Stacks are designed and fabricated in-house through a deep UV lithography technique, with SU 8 photoresist used as the microstructure mold… (more)

Yeh, Jian-liang

2010-01-01T23:59:59.000Z

164

Polyelectrolyte multilayers (PEM) in micro / nanofluidics for novel BioMEMS platforms  

E-Print Network [OSTI]

The overall goal of this thesis was to exploit the versatility of the polyelectrolyte multilayer (PEM) to fabricate a novel micro/nanofluidic device for patterning bacteria in BioMEMS. Nanofluidic channels offer new ...

Jang, Hongchul

2010-01-01T23:59:59.000Z

165

Three-dimensional effects of liquid water flooding in the cathode of a PEM fuel cell  

E-Print Network [OSTI]

. Researchers all over the world are focusing on optimizing this system to be cost competitive with energy conversion devices currently available. It is a well known fact that the cathode of the PEM fuel cell is the performance limiting component due...THREE DIMENSIONAL EFFECTS OF LIQUID WATER FLOODING IN THE CATHODE OF A PEM FUEL CELL by Dilip Natarajan and Trung Van Nguyen* Department of Chemical and Petroleum Engineering University of Kansas Lawrence, KS 66045, USA Submitted...

Natarajan, Dilip; Van Nguyen, Trung

2003-03-27T23:59:59.000Z

166

Method of making MEA for PEM/SPE fuel cell  

DOE Patents [OSTI]

A method of making a membrane-electrode-assembly (MEA) for a PEM/SPE fuel cell comprising applying a slurry of electrode-forming material directly onto a membrane-electrolyte film. The slurry comprises a liquid vehicle carrying catalyst particles and a binder for the catalyst particles. The membrane-electrolyte is preswollen by contact with the vehicle before the electrode-forming slurry is applied to the membrane-electrolyte. The swollen membrane-electrolyte is constrained against shrinking in the "x" and "y" directions during drying. Following assembly of the fuel cell, the MEA is rehydrated inside the fuel cell such that it swells in the "z" direction for enhanced electrical contact with contiguous electrically conductive components of the fuel cell.

Hulett, Jay S. (West Henrietta, NY)

2000-01-01T23:59:59.000Z

167

A portable power system using PEM fuel cells  

SciTech Connect (OSTI)

Ball has developed a proof-of-concept, small, lightweight, portable power system. The power system uses a proton exchange membrane (PEM) fuel cell stack, stored hydrogen, and atmospheric oxygen as the oxidant to generate electrical power. Electronics monitor the system performance to control cooling air and oxidant flow, and automatically do corrective measures to maintain performance. With the controller monitoring the system health, the system can operate in an ambient environment from 0 C to +50 C. The paper describes system testing, including load testing, thermal and humidity testing, vibration and shock testing, field testing, destructive testing of high-pressure gas tanks, and test results on the fuel cell power system, metal hydride hydrogen storage, high-pressure hydrogen gas storage, and chemical hydride hydrogen storage.

Long, E. [Ball Aerospace and Technologies Corp., Boulder, CO (United States)

1997-12-31T23:59:59.000Z

168

PEM Electrolyzer Incorporating an Advanced Low-Cost Membrane  

SciTech Connect (OSTI)

The Department of Energy (DOE) has identified hydrogen production by electrolysis of water at forecourt stations as a critical technology for transition to the hydrogen economy; however, the cost of hydrogen produced by present commercially available electrolysis systems is considerably higher than the DOE 2015 and 2020 cost targets. Analyses of proton-exchange membrane (PEM) electrolyzer systems indicate that reductions in electricity consumption and electrolyzer stack and system capital cost are required to meet the DOE cost targets. The primary objective is to develop and demonstrate a cost-effective energy-based system for electrolytic generation of hydrogen. The goal is to increase PEM electrolyzer efficiency and to reduce electrolyzer stack and system capital cost to meet the DOE cost targets for distributed electrolysis. To accomplish this objective, work was conducted by a team consisting of Giner, Inc. (Giner), Virginia Polytechnic Institute & University (VT), and domnick hunter group, a subsidiary of Parker Hannifin (Parker). The project focused on four (4) key areas: (1) development of a high-efficiency, high-strength membrane; (2) development of a long-life cell-separator; (3) scale-up of cell active area to 290 cm2 (from 160 cm²); and (4) development of a prototype commercial electrolyzer system. In each of the key stack development areas Giner and our team members conducted focused development in laboratory-scale hardware, with analytical support as necessary, followed by life-testing of the most promising candidate materials. Selected components were then scaled up and incorporated into low-cost scaled-up stack hardware. The project culminated in the fabrication and testing of a highly efficient electrolyzer system for production of 0.5 kg/hr hydrogen and validation of the stack and system in testing at the National Renewable Energy Laboratory (NREL).

Hamdan, Monjid [Giner, Inc.] [Giner, Inc.

2013-08-29T23:59:59.000Z

169

A polymer electrolyte fuel cell stack for stationary power generation from hydrogen fuel  

SciTech Connect (OSTI)

The fuel cell is the most efficient device for the conversion of hydrogen fuel to electric power. As such, the fuel cell represents a key element in efforts to demonstrate and implement hydrogen fuel utilization for electric power generation. A central objective of a LANL/Industry collaborative effort supported by the Hydrogen Program is to integrate PEM fuel cell and novel stack designs at LANL with stack technology of H-Power Corporation (H-Power) in order to develop a manufacturable, low-cost/high-performance hydrogen/air fuel cell stack for stationary generation of electric power. A LANL/H-Power CRADA includes Tasks ranging from exchange, testing and optimization of membrane-electrode assemblies of large areas, development and demonstration of manufacturable flow field, backing and bipolar plate components, and testing of stacks at the 3-5 cell level and, finally, at the 4-5 kW level. The stack should demonstrate the basic features of manufacturability, overall low cost and high energy conversion efficiency. Plans for future work are to continue the CRADA work along the time line defined in a two-year program, to continue the LANL activities of developing and testing stainless steel hardware for longer term stability including testing in a stack, and to further enhance air cathode performance to achieve higher energy conversion efficiencies as required for stationary power application.

Zawodzinski, C.; Wilson, M.; Gottesfeld, S. [Los Alamos National Lab., NM (United States)

1996-10-01T23:59:59.000Z

170

Low Cost PEM Fuel Cell Metal Bipolar Plates  

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

manufacture. - Demonstrate our metal plate application in portable, stationary and automobile fuel cell systems. 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50...

171

Engineered nano-scale ceramic supports for PEM fuel cells  

SciTech Connect (OSTI)

Catalyst support durability is currently a technical barrier for commercialization of polymer electrolyte membrane (PEM) fuel cells, especially for transportation applications. Degradation and corrosion of the conventional carbon supports leads to losses in active catalyst surface area and, consequently, reduced performance. As a result, the major aim of this work is to develop support materials that interact strongly with Pt, yet sustain bulk-like catalytic activities with very highly dispersed particles. This latter aspect is key to attaining the 2015 DOE technical targets for platinum group metal (PGM) loadings (0.20 mg/cm{sup 2}). The benefits of the use of carbon-supported catalysts to drastically reduce Pt loadings from the early, conventional Pt-black technology are well known. The supported platinum catalyzed membrane approach widely used today for fabrication of membrane electrode assemblies (MEAs) was developed shortly thereafter these early reports. Of direct relevance to this present work, are the investigations into Pt particle growth in PEM fuel cells, and subsequent follow-on work showing evidence of Pt particles suspended free of the support within the catalyst layer. Further, durability work has demonstrated the detrimental effects of potential cycling on carbon corrosion and the link between electrochemical surface area and particle growth. To avoid the issues with carbon degradation altogether, it has been proposed by numerous fuel cell research groups to replace carbon supports with conductive materials that are ceramic in nature. Intrinsically, these many conductive oxides, carbides, and nitrides possess the prerequisite electronic conductivity required, and offer corrosion resistance in PEMFC environments; however, most reports indicate that obtaining sufficient surface area remains a significant barrier to obtaining desirable fuel ceU performance. Ceramic materials that exhibit high electrical conductivity and necessary stability under fuel cell conditions must also exhibit high surface area as a necessary adjunct to obtaining high Pt dispersions and Pt utilization targets. Our goal in this work is to identify new synthesis approaches together with materials that will lead to ceramic supports with high surface areas and high Pt dispersions. Several strong candidates for use as PEMFC catalyst supports include: transition metal nitrides and substoichiometric titanium oxides, which hither to now have been prepared by other researcher groups with relatively low surface areas (ca. 1-50 m{sup 2}/g typical). To achieve our goals of engineering high surface area, conductive ceramic support for utilization in PEMFCs, a multi-institutional and multi-disciplinary team with experience synthesizing and investigating these materials has been assembled. This team is headed by Los Alamos National Laboratory and includes Oak Ridge National Laboratory and the University of New Mexico. This report describes our fiscal year 2010 technical progress related to applying advanced synthetiC methods towards the development of new ceramic supports for Pt catalysts for PEM fuel cells.

Brosha, Eric L [Los Alamos National Laboratory; Blackmore, Karen J [Los Alamos National Laboratory; Burrell, Anthony K [Los Alamos National Laboratory; Henson, Neil J [Los Alamos National Laboratory; Phillips, Jonathan [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

172

Transportation and Stationary Power Integration Workshop Agenda...  

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

Agenda, October 27, 2008, Phoenix, Arizonia Transportation and Stationary Power Integration Workshop Agenda, October 27, 2008, Phoenix, Arizonia Agenda for the Transportation and...

173

Transportation and Stationary Power Integration with Hydrogen...  

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

with Hydrogen and Fuel Cell Technology in Connecticut Transportation and Stationary Power Integration with Hydrogen and Fuel Cell Technology in Connecticut Overview of strengths,...

174

Transportation and Stationary Power Integration Workshop: ""An...  

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

""An Automaker's Views on the Transition to Hydrogen and Fuel Cell Vehicles Transportation and Stationary Power Integration Workshop: ""An Automaker's Views on the Transition to...

175

Transportation and Stationary Power Integration Workshop Session...  

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

Integration Workshop Session II: State and Industry Perspectives Transportation and Stationary Power Integration Workshop Session II: State and Industry Perspectives Opportunities...

176

Development of a 400 W High Temperature PEM Fuel Cell Power Pack : Fuel Cell S. Andreasen, M. Bang, A. Korsgaard, M. Nielsen, S. Kr  

E-Print Network [OSTI]

Development of a 400 W High Temperature PEM Fuel Cell Power Pack : Fuel Cell Stack Test S, containing about 8 times more energy by volume. Fuelling NaÃ?on based low temperature PEM (LTPEM) fuel cells]. PBI (polybenzoemidazole) based high temperature PEM (HTPEM) fuel cells can operate stable at much

Berning, Torsten

177

Determination of the Dynamic Characteristics in the CO Transient Process in a PEM Fuel Cell Woo-kum Lee and J. W. Van Zee  

E-Print Network [OSTI]

Determination of the Dynamic Characteristics in the CO Transient Process in a PEM Fuel Cell Woo Road, Elkton, MD 21922-1488 Key words: PEM Fuel Cell, CO transient, Time constant Prepared publications #12;1 Determination of the Dynamic Characteristics in the CO Transient Process in a PEM Fuel Cell

Van Zee, John W.

178

Postdoctoral Fellowships in PEM Fuel Cell Catalyst Development The Center for Electrochemical Engineering (http://www.che.sc.edu/centers/CEE/),  

E-Print Network [OSTI]

Postdoctoral Fellowships in PEM Fuel Cell Catalyst Development The Center for Electrochemical membrane (PEM) fuel cell catalysts for oxygen reduction reaction (ORR) having ultra-low Pt loading in #12;Pt and Pt-alloy catalysts development for PEM fuel cells and MEA preparation using decal transfer

Popov, Branko N.

179

Journal of Power Sources 162 (2006) 388399 Model-based condition monitoring of PEM fuel cell using  

E-Print Network [OSTI]

Journal of Power Sources 162 (2006) 388­399 Model-based condition monitoring of PEM fuel cell using of polymer electrolyte membrane (PEM) fuel cell systems, temporary faults in such systems still might occur/uncertainty of the fuel cell system, and the measurement noise. In this research, we propose a model-based condition

Ding, Yu

2006-01-01T23:59:59.000Z

180

Fiber-optic sensor for detection of hydrogen peroxide in PEM fuel cells Juan F. Botero-Cadavid  

E-Print Network [OSTI]

Fiber-optic sensor for detection of hydrogen peroxide in PEM fuel cells by Juan F. Botero-optic sensor for detection of hydrogen peroxide in PEM fuel cells by Juan F. Botero-Cadavid Mech electrolyte membrane fuel cells (PEMFCs), and the presence and formation of this peroxide has been associated

Victoria, University of

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Novel Catalyst Support Materials for PEM Fuel Cells: Current Status and Future Prospects  

SciTech Connect (OSTI)

The catalyst supports exhibit great influence on the cost, performance, and durability of polymer electrolyte membrane (PEM) fuel cells. This review paper is to summarize several important kinds of novel support materials for PEM fuel cells (including direct methanol fuel cell, DMFC): nanostructured carbon materials (carbon nanotubes/carbon nanofibers, mesoporous carbon), conductive doped diamonds and nanodiamonds, conductive oxides (tin oxide/indium tin oxide, titanium oxide, tungsten oxide) and carbides (tungsten carbides). The advantages and disadvantages, the acting mechanism to promote electrocatalysis, and the strategies to improve present catalyst support materials and to search for new ones are discussed. This is expected to throw light on future development of catalyst support for PEM fuel cells.

Shao, Yuyan; Liu, Jun; Wang, Yong; Lin, Yuehe

2008-12-15T23:59:59.000Z

182

HYDROGEN PRODUCTION THROUGH ELECTROLYSIS Robert J. Friedland  

E-Print Network [OSTI]

HYDROGEN PRODUCTION THROUGH ELECTROLYSIS Robert J. Friedland A. John Speranza Proton Energy Systems of the Department of Energy (DOE). Proton's goal is to drive the cost of PEM electrolysis to levels of $600 per years of the cost reduction efforts for the HOGEN 40 hydrogen generator on this program are in line

183

160 C PROTON EXCHANGE MEMBRANE (PEM) FUEL CELL SYSTEM DEVELOPMENT  

SciTech Connect (OSTI)

The objectives of this program were: (a) to develop and demonstrate a new polymer electrolyte membrane fuel cell (PEMFC) system that operates up to 160 C temperatures and at ambient pressures for stationary power applications, and (b) to determine if the GTI-molded composite graphite bipolar separator plate could provide long term operational stability at 160 C or higher. There are many reasons that fuel cell research has been receiving much attention. Fuel cells represent environmentally friendly and efficient sources of electrical power generation that could use a variety of fuel sources. The Gas Technology Institute (GTI), formerly Institute of Gas Technology (IGT), is focused on distributed energy stationary power generation systems. Currently the preferred method for hydrogen production for stationary power systems is conversion of natural gas, which has a vast distribution system in place. However, in the conversion of natural gas into a hydrogen-rich fuel, traces of carbon monoxide are produced. Carbon monoxide present in the fuel gas will in time cumulatively poison, or passivate the active platinum catalysts used in the anodes of PEMFC's operating at temperatures of 60 to 80 C. Various fuel processors have incorporated systems to reduce the carbon monoxide to levels below 10 ppm, but these require additional catalytic section(s) with sensors and controls for effective carbon monoxide control. These CO cleanup systems must also function especially well during transient load operation where CO can spike 300% or more. One way to circumvent the carbon monoxide problem is to operate the fuel cell at a higher temperature where carbon monoxide cannot easily adsorb onto the catalyst and poison it. Commercially available polymer membranes such as Nafion{trademark} are not capable of operation at temperatures sufficiently high to prevent this. Hence this project investigated a new polymer membrane alternative to Nafion{trademark} that is capable of operation at temperatures up to 160 C.

L.G. Marianowski

2001-12-21T23:59:59.000Z

184

Fuel Quality Issues in Stationary Fuel Cell Systems | Department...  

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

Fuel Quality Issues in Stationary Fuel Cell Systems Fuel Quality Issues in Stationary Fuel Cell Systems This report, prepared by Argonne National Laboratory, looks at impurities...

185

Procuring Fuel Cells for Stationary Power: A Guide for Federal...  

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

Procuring Fuel Cells for Stationary Power: A Guide for Federal Facility Decision Makers Procuring Fuel Cells for Stationary Power: A Guide for Federal Facility Decision Makers This...

186

Energy Storage Technologies: State of Development for Stationary...  

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

Technologies: State of Development for Stationary and Vehicular Applications Energy Storage Technologies: State of Development for Stationary and Vehicular Applications Testimony...

187

Fact Sheet: Lithium-Ion Batteries for Stationary Energy Storage...  

Energy Savers [EERE]

Fact Sheet: Lithium-Ion Batteries for Stationary Energy Storage (October 2012) Fact Sheet: Lithium-Ion Batteries for Stationary Energy Storage (October 2012) DOE's Energy Storage...

188

Overview of Hydrogen and Fuel Cell Activities: 2011 IPHE Stationary...  

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

Overview of Hydrogen and Fuel Cell Activities: 2011 IPHE Stationary Fuel Cell Workshop Overview of Hydrogen and Fuel Cell Activities: 2011 IPHE Stationary Fuel Cell Workshop...

189

Procuring Fuel Cells for Stationary Power: A Guide for Federal...  

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

Procuring Fuel Cells for Stationary Power: A Guide for Federal Decision Makers Procuring Fuel Cells for Stationary Power: A Guide for Federal Decision Makers Download presentation...

190

Stationary and Portable Fuel Cell Systems Codes and Standards...  

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

Stationary and Portable Fuel Cell Systems Codes and Standards Citations Stationary and Portable Fuel Cell Systems Codes and Standards Citations This document lists codes and...

191

Overview of Hydrogen and Fuel Cell Activities: 2011 IPHE Stationary...  

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

Cell Activities: 2011 IPHE Stationary Fuel Cell Workshop Overview of Hydrogen and Fuel Cell Activities: 2011 IPHE Stationary Fuel Cell Workshop Presentation by Rick Farmer at the...

192

Three-Dimensional Computational Analysis of Transport Phenomena in a PEM Fuel Cell  

E-Print Network [OSTI]

Three-Dimensional Computational Analysis of Transport Phenomena in a PEM Fuel Cell by Torsten or other means, without permission of the author. #12;Supervisor: Dr. N. Djilali Abstract Fuel cells-isothermal computational model of a proton exchange membrane fuel cell (PEMFC). The model was developed to improve

Victoria, University of

193

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for  

E-Print Network [OSTI]

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Applications number of vehicles it represents, DOE has established detailed cost targets for automotive fuel cell and track the cost of automotive fuel cell systems as progress is made in fuel cell technology. The purpose

194

Degradation phenomena in PEM fuel cell with dead-ended anode  

E-Print Network [OSTI]

Degradation phenomena in PEM fuel cell with dead-ended anode Toyoaki Matsuura, Jixin Chen*, Jason B of Energy (DOE) target of 30 $/kW for automotive application by 2015 [1], cost reduction in both fuel cell currently ac- counts for around 50% of the fuel cell system cost, is also essential [1]. Conventional fuel

Stefanopoulou, Anna

195

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for  

E-Print Network [OSTI]

Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Applications: 2010 Update it represents, the DOE has established detailed cost targets for automotive fuel cell systems and components of automotive fuel cell systems as progress is made in fuel cell technology. The purpose of these cost analyses

196

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for  

E-Print Network [OSTI]

Mass Production Cost Estimation for Direct H2 PEM Fuel Cell Systems for Automotive Applications for transportation. Fuel cell systems will have to be cost-competitive with conventional and advanced vehicle it represents, the DOE has established detailed cost targets for automotive fuel cell systems and components

197

Water Transport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing,  

E-Print Network [OSTI]

Optimization J. Vernon Cole and Ashok Gidwani CFDRC Prepared for: DOE Hydrogen Fuel Cell Kickoff MeetingWater Transport in PEM Fuel Cells: Advanced Modeling, Material Selection, Testing, and Design fuel cell design and operation; Demonstrate improvements in water management resulting in improved

198

Draft Funding Opportunity Announcement Research and Development of Polymer Electrolyte Membrane (PEM)  

E-Print Network [OSTI]

are a critical component of the fuel cell stack and must be durable and tolerate a wide range of operating's humidity requirements add complexity to the fuel cell system that impacts the system cost and durability Membrane (PEM) Fuel Cells for the Hydrogen Economy The Department of Energy (DOE) is planning to issue

199

Water Transport Characteristics of Gas Diffusion Layer in a PEM Fuel Cell  

SciTech Connect (OSTI)

A presentation addressing the following: Water transport in PEM Fuel Cells - a DoE Project 1. Gas Diffusion Layer--Role and Characteristics 2. Capillary Pressure Determinations of GDL Media 3. Gas Permeability Measurements of GDL Media 4. Conclusions and Future Activities

Ashok S. Damle; J. Vernon Cole

2008-11-01T23:59:59.000Z

200

A Three-Dimensional Computational Model of PEM Fuel Cell with Serpentine Gas Channels  

E-Print Network [OSTI]

A Three-Dimensional Computational Model of PEM Fuel Cell with Serpentine Gas Channels by Phong) fuel cell with serpentine gas flow channels is presented in this thesis. This comprehensive model accounts for important transport phenomena in a fuel cell such as heat transfer, mass transfer, electrode

Victoria, University of

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

PEM fuel cell cost minimization using ``Design For Manufacture and Assembly`` techniques  

SciTech Connect (OSTI)

Polymer Electrolyte Membrane (PEM) fuel cells fueled with direct hydrogen have demonstrated substantial technical potential to replace Internal Combustion Engines (ICE`s) in light duty vehicles. Such a transition to a hydrogen economy offers the potential of substantial benefits from reduced criteria and greenhouse emissions as well as reduced foreign fuel dependence. Research conducted for the Ford Motor Co. under a US Department of Energy contract suggests that hydrogen fuel, when used in a fuel cell vehicle (FCV), can achieve a cost per vehicle mile less than or equal to the gasoline cost per mile when used in an ICE vehicle. However, fuel cost parity is not sufficient to ensure overall economic success: the PEM fuel cell power system itself must be of comparable cost to the ICE. To ascertain if low cost production of PEM fuel cells is feasible, a powerful set of mechanical engineering tools collectively referred to as Design for Manufacture and Assembly (DFMA) has been applied to several representative PEM fuel cell designs. The preliminary results of this work are encouraging, as presented.

Lomax, F.D. Jr.; James, B.D. [Directed Technologies, Inc., Arlington, VA (United States); Mooradian, R.P. [Ford Motor Co., Dearborn, MI (United States)

1997-12-31T23:59:59.000Z

202

Algorithm Development for Electrochemical Impedance Spectroscopy Diagnostics in PEM Fuel Cells  

E-Print Network [OSTI]

Algorithm Development for Electrochemical Impedance Spectroscopy Diagnostics in PEM Fuel Cells Abstract The purpose of this work is to develop algorithms to identify fuel cell faults using-board fuel cell diagnostic hardware. Impedance can identify faults that cannot be identified solely by a drop

Victoria, University of

203

Sulfur Dioxide Crossover during the Production of Hydrogen and Sulfuric Acid in a PEM Electrolyzer  

E-Print Network [OSTI]

Sulfur Dioxide Crossover during the Production of Hydrogen and Sulfuric Acid in a PEM Electrolyzer in the thermochemical conversion of sulfur dioxide to sulfuric acid for the large-scale production of hydrogen, 2009. Published May 19, 2009. The hybrid sulfur process is being investigated as an efficient way

Weidner, John W.

204

Superconducting Coil fed by PEM Fuel Cell M. Hinaje, K. Berger, J. Lvque, B. Davat  

E-Print Network [OSTI]

Superconducting Coil fed by PEM Fuel Cell M. Hinaje, K. Berger, J. Lévêque, B. Davat Université de, 54516 Vandoeuvre-lès-Nancy, France Melika.Hinaje@univ-lorraine.fr Abstract- Fuel cells and around 0.6 V in nominal conditions of power generation. Fuel cells are then by essence low voltage

Boyer, Edmond

205

Stationary phase deposition based on onium salts  

DOE Patents [OSTI]

Onium salt chemistry can be used to deposit very uniform thickness stationary phases on the wall of a gas chromatography column. In particular, the stationary phase can be bonded to non-silicon based columns, especially microfabricated metal columns. Non-silicon microfabricated columns may be manufactured and processed at a fraction of the cost of silicon-based columns. In addition, the method can be used to phase-coat conventional capillary columns or silicon-based microfabricated columns.

Wheeler, David R. (Albuquerque, NM); Lewis, Patrick R. (Albuquerque, NM); Dirk, Shawn M. (Albuquerque, NM); Trudell, Daniel E. (Albuquerque, NM)

2008-01-01T23:59:59.000Z

206

Next Generation Bipolar Plates for Automotive PEM Fuel Cells  

SciTech Connect (OSTI)

The results of a successful U.S. Department of Energy (DoE) funded two-year $2.9 MM program lead by GrafTech International Inc. (GrafTech) are reported and summarized. The program goal was to develop the next generation of high temperature proton exchange membrane (PEM) fuel cell bipolar plates for use in transportation fuel cell applications operating at temperatures up to 120 °C. The bipolar plate composite developed during the program is based on GrafTech’s GRAFCELL? resin impregnated flexible graphite technology and makes use of a high temperature Huntsman Advanced Materials resin system which extends the upper use temperature of the composite to the DoE target. High temperature performance of the new composite is achieved with the added benefit of improvements in strength, modulus, and dimensional stability over the incumbent resin systems. Other physical properties, including thermal and electrical conductivity of the new composite are identical to or not adversely affected by the new resin system. Using the new bipolar plate composite system, machined plates were fabricated and tested in high temperature single-cell fuel cells operating at 120 °C for over 1100 hours by Case Western Reserve University. Final verification of performance was done on embossed full-size plates which were fabricated and glued into bipolar plates by GrafTech. Stack testing was done on a 10-cell full-sized stack under a simulated drive cycle protocol by Ballard Power Systems. Freeze-thaw performance was conducted by Ballard on a separate 5-cell stack and shown to be within specification. A third stack was assembled and shipped to Argonne National Laboratory for independent performance verification. Manufacturing cost estimate for the production of the new bipolar plate composite at current and high volume production scenarios was performed by Directed Technologies Inc. (DTI). The production cost estimates were consistent with previous DoE cost estimates performed by DTI for the DoE on metal plates. The final result of DTI’s analysis for the high volume manufacturing scenario ($6.85 /kW) came in slightly above the DoE target of $3 to $5/kW. This estimate was derived using a “Best Case Scenario” for many of the production process steps and raw material costs with projections to high volumes. Some of the process improvements assumed in this “Best Case Scenario” including high speed high impact forming and solvent-less resins, have not yet been implemented, but have a high probability of potential success.

Orest Adrianowycz; Julian Norley; David J. Stuart; David Flaherty; Ryan Wayne; Warren Williams; Roger Tietze; Yen-Loan H. Nguyen; Tom Zawodzinski; Patrick Pietrasz

2010-04-15T23:59:59.000Z

207

High resolution neutron imaging of water in PEM fuel cells  

SciTech Connect (OSTI)

Optimal water management in Polymer Electrolyte Membrane (PEM) fuel cells is critical to improving the performance and durability of fuel cell systems especially during transient, start-up and shut-down operations. For example, while a high water content is desirable for improved membrane and catalyst ionomer conductivity, high water content can also block gas access to the triple-phase boundary resulting in lowered performance due to catalyst and gas diffusion layer (GDL) flooding. Visualizing liquid water by neutron imaging has been used over the past decade to study the water distribution inside operating fuel cells. In this paper, the results from our imaging at NIST using their recently installed higher resolution ({approx} 25 mm) Microchannel Plate (MCP) detector with a pixel pitch of 14.7 mm are presented. This detector is capable of quantitatively imaging the water inside the MEA (Membrane Electrode Assembly)/GDL (Gas Diffusion Layer) of working fuel cells and can provide the water profiles within these various components in addition to the channel water. Specially designed fuel cells (active area = 2.25 cm{sup 2}) have been used in order to take advantage of the full detector resolution. The cell design is illustrated in a figure where one of the current collector/end plates is shown. The serpentine pattern was machined into a block of aluminum and plated with nickel and then gold to form the flow field. The measurements were performed using beam no. 1 and aperture no. 2 with a fluence rate of 1.9 x 10{sup 6} neutrons cm{sup -2} sec{sup -1}. The cells were assembled with Gore{sup TM} Primea{sup R} MEAs and SGL Sigracet {sup R} 24 series GDLs (PRIMEA, GORE-SELECT and GORE are trademarks of W. L. Gore & Associates, Inc). All the cells were tested at 80 {sup o}C with 1.2 stoichiometry H{sub 2} and 2.0 stoichiometry air flows.

Mukundan, Rangachary [Los Alamos National Laboratory; Borup, Rodney L [Los Alamos National Laboratory; Davey, John R [Los Alamos National Laboratory; Spendelow, Jacob S [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

208

Feasibility and electromagnetic compatibility study of the ClearPEM front-end electronics for simultaneous PET-MR imaging  

E-Print Network [OSTI]

electromagnetic interference (EMI) effects between both systems were evaluated on a 7 T magnet by characterizing. Materials and methods The mutual electromagnetic interference tests between Clear- PEM front-end electronics

Dalang, Robert C.

209

Optimization of the Cathode Catalyst Layer Composition of a PEM Fuel Cell Using a Novel 2-Step Preparation Method  

E-Print Network [OSTI]

For good performance and high durability PEM fuel cells run at high water saturation levels. However, excess liquid water generated by the oxygen reduction reaction at the cathode can block pores in the catalyst layer so ...

Friedmann, Roland

2009-03-05T23:59:59.000Z

210

Sacred Cars? Cost-Effective Regulation of Stationary and Non-stationary Pollution Sources  

E-Print Network [OSTI]

Sacred Cars? Cost-Effective Regulation of Stationary and Non-stationary Pollution Sources Meredith reasons, environmental regulations sometimes treat point source polluters, such as power plants, differently from mobile source polluters, such as vehicles. This paper measures the extent of this regulatory

Sadoulet, Elisabeth

211

Sacred Cars? Cost-Effective Regulation of Stationary and Non-stationary Pollution Sources  

E-Print Network [OSTI]

asymmetry in the case of nitrogen oxides (NOx), the most recalcitrant criteria air pollutant in the UnitedSacred Cars? Cost-Effective Regulation of Stationary and Non-stationary Pollution Sources Meredith, differently from mobile-source polluters, such as vehicles. This paper measures the extent of this regulatory

Fowlie, Meredith

212

Development of Ultra-low Platinum Alloy C th d C t l t f PEM F l C ll  

E-Print Network [OSTI]

Fuel Cells 2010 DOE Hydrogen Program Fuel Cell Project Kick-Off P I : Branko N PopovP. I.: Branko N of the catalyst layers which increases the cell resistance. ¾¾ Pt catalyst accelerates the rate of carbonDevelopment of Ultra-low Platinum Alloy C th d C t l t f PEM F l C ll Cathode Catalyst for PEM

213

A Mathematical Model for Predicting the Life of PEM Fuel Cell Membranes Subjected to Hydration Cycling  

E-Print Network [OSTI]

Under typical PEM fuel cell operating conditions, part of membrane electrode assembly is subjected to humidity cycling due to variation of inlet gas RH and/or flow rate. Cyclic membrane hydration/dehydration would cause cyclic swelling/shrinking of the unconstrained membrane. In a constrained membrane, it causes cyclic stress resulting in mechanical failure in the area adjacent to the gas inlet. A mathematical modeling framework for prediction of the lifetime of a PEM FC membrane subjected to hydration cycling is developed in this paper. The model predicts membrane lifetime as a function of RH cycling amplitude and membrane mechanical properties. The modeling framework consists of three model components: a fuel cell RH distribution model, a hydration/dehydration induced stress model that predicts stress distribution in the membrane, and a damage accrual model that predicts membrane life-time. Short descriptions of the model components along with overall framework are presented in the paper. The model was used...

Burlatsky, S F; O'Neill, J; Atrazhev, V V; Varyukhin, A N; Dmitriev, D V; Erikhman, N S

2013-01-01T23:59:59.000Z

214

Investigating Methods of Heat Recovery from Low-Temperature PEM Fuel Cells in CHP Applications  

SciTech Connect (OSTI)

Heat recovery from low-temperature proton exchange membrane (PEM) fuel cells poses a number of challenges. In response to these challenges, thermodynamic assessments of proposed heat recovery methods are studied in the context of combined heat and power (CHP) for building applications. Preheating combustion air in conjunction with desiccant dehumidification and absorption cooling technologies is one of the two strategies examined in this study. The other approach integrates the PEM fuel cell with a water-loop heat pump (WLHP) for direct heat recovery. As the primary objective, energy-saving potentials of the adopted heat recovery strategies are estimated with respect to various benchmarks. The quantified energy-saving potentials are translated into effective CHP performance indices and compared with those typically specified by the manufacturers for service hot water applications. The need for developing CHP performance protocols is also discussed in light of the proposed energy recovery techniques - thereby, accomplishing the secondary objective.

Jalalzadeh-Azar, A. A.

2004-01-01T23:59:59.000Z

215

Process for recycling components of a PEM fuel cell membrane electrode assembly  

DOE Patents [OSTI]

The membrane electrode assembly (MEA) of a PEM fuel cell can be recycled by contacting the MEA with a lower alkyl alcohol solvent which separates the membrane from the anode and cathode layers of the assembly. The resulting solution containing both the polymer membrane and supported noble metal catalysts can be heated under mild conditions to disperse the polymer membrane as particles and the supported noble metal catalysts and polymer membrane particles separated by known filtration means.

Shore, Lawrence (Edison, NJ)

2012-02-28T23:59:59.000Z

216

NON-STATIONARY CONDITION MONITORING THROUGH EVENT  

E-Print Network [OSTI]

in large diesel engines used for propulsion and power generation. Such operation involves frequent changes the technique for non-stationary condition monitoring of large diesel engines based on acoustical emission that cannot be separated from alarms originating from real faults. MAN B&W Diesel has conducted experiments

217

Test profiles for stationary energy storage applications  

SciTech Connect (OSTI)

Evaluation of battery and other energy storage technologies for stationary uses is progressing rapidly toward application-specific testing that uses computer-based data acquisition and control equipment, active electronic loads and power supplies, and customized software, to enable sophisticated test regimes that simulate actual use conditions. These simulated-use tests provide more accurate performance and life evaluations than simple constant resistance or current testing regimes. Some of the tests use stepped constant-power charge and discharge regimes to simulate conditions created by electric utility applications such as frequency regulation and spinning reserve. Other test profiles under development simulate conditions for the energy storage component of Remote Area Power Supplies (RAPS) that include renewable and/or fossil-fueled generators. Various RAPS applications have unique sets of service conditions that require specialized test profiles. However, almost all RAPS tests and many tests that represent other stationary applications need to simulate significant time periods during which storage devices operate at low-to-medium states-of-charge without full recharge. Consideration of these and similar issues in simulated-use test regimes is necessary to effectively predict the responses of the various types of batteries in specific stationary applications. This paper describes existing and evolving stationary applications for energy storage technologies and test regimes that are designed to simulate them. The paper also discusses efforts to develop international testing standards.

Butler, P.C. [Sandia National Labs., Albuquerque, NM (United States); Cole, J.F. [International Lead Zinc Research Organization, Research Triangle Park, NC (United States); Taylor, P.A. [Energetics, Inc., Columbia, MD (United States)

1998-09-01T23:59:59.000Z

218

8, 1084110872, 2008 Non-stationary  

E-Print Network [OSTI]

ACPD 8, 10841­10872, 2008 Non-stationary dispersion on complex terrain J. L. Palau et al. Title on complex terrain under summer conditions J. L. Palau 1 , G. P´erez-Landa 2 , and M. M. Mill´an 1 1 Fundaci ­ Published: 5 June 2008 Correspondence to: J. L. Palau (jlp@confluencia.biz) Published by Copernicus

Paris-Sud XI, Université de

219

Full Counting Statistics of Stationary Particle Beams  

E-Print Network [OSTI]

We present a general scheme for treating particle beams as many particle systems. This includes the full counting statistics and the requirements of Bose/Fermi symmetry. In the stationary limit, i.e., for longer and longer beams, the total particle number diverges, and a description in Fock space is no longer possible. We therefore extend the formalism to include stationary beams. These beams exhibit a well-defined "local" counting statistics, by which we mean the full counting statistics of all clicks falling into any given finite interval. We treat in detail a model of a source, creating particles in a fixed state, which then evolve under the free time evolution, and we determine the resulting stationary beam in the far field. In comparison to the one-particle picture we obtain a correction due to Bose/Fermi statistics, which depends on the emission rate. We also consider plane waves as stationary many particle states, and determine the distribution of intervals between successive clicks in such a beam.

J. Kiukas; A. Ruschhaupt; R. F. Werner

2011-03-07T23:59:59.000Z

220

Gauge equivalence in stationary radiative transport through media ...  

E-Print Network [OSTI]

Stability of the Gauge Equivalent Classes in Inverse. Stationary Transport. Stephen McDowall† , Plamen Stefanov‡ , and Alexandru. Tamasan§. †

2009-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

L. Placca, R. Kouta, D. Candusso, J-F. Blachot, W. Charon (mai 2010). Analysis of PEM fuel cell experimental data using Principal Component Analysis and multi-linear regression.  

E-Print Network [OSTI]

· L. Placca, R. Kouta, D. Candusso, J-F. Blachot, W. Charon (mai 2010). Analysis of PEM fuel cell of Hydrogen Energy. Vol. 35, n°10, pp. 4582-4591. Ed. Elsevier. Analysis of PEM fuel cell experimental data Laboratory (FC LAB) at Belfort on a PEM fuel cell stack using a homemade fully instrumented test bench led

Paris-Sud XI, Université de

222

An Overview of Stationary Fuel Cell Technology  

SciTech Connect (OSTI)

Technology developments occurring in the past few years have resulted in the initial commercialization of phosphoric acid (PA) fuel cells. Ongoing research and development (R and D) promises further improvement in PA fuel cell technology, as well as the development of proton exchange membrane (PEM), molten carbonate (MC), and solid oxide (SO) fuel cell technologies. In the long run, this collection of fuel cell options will be able to serve a wide range of electric power and cogeneration applications. A fuel cell converts the chemical energy of a fuel into electrical energy without the use of a thermal cycle or rotating equipment. In contrast, most electrical generating devices (e.g., steam and gas turbine cycles, reciprocating engines) first convert chemical energy into thermal energy and then mechanical energy before finally generating electricity. Like a battery, a fuel cell is an electrochemical device, but there are important differences. Batteries store chemical energy and convert it into electrical energy on demand, until the chemical energy has been depleted. Depleted secondary batteries may be recharged by applying an external power source, while depleted primary batteries must be replaced. Fuel cells, on the other hand, will operate continuously, as long as they are externally supplied with a fuel and an oxidant.

DR Brown; R Jones

1999-03-23T23:59:59.000Z

223

184 IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 26, NO. 1, MARCH 2011 PEM Fuel Cell Stack Modeling for Real-Time  

E-Print Network [OSTI]

184 IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 26, NO. 1, MARCH 2011 PEM Fuel Cell Stack Modeling membrane (PEM) fuel cell stack itself cannot be used directly as an en- ergy supply and require stack. In addition, fuel cell test costs (hydrogen consumption and the need of safety installations) are still

Simões, Marcelo Godoy

224

Experimental and Modeling Studies of Two-Phase Flow in Porous Media and Its Effects on the Performance of a PEM Fuel Cell  

E-Print Network [OSTI]

An experimental investigation was conducted to study the two-phase flow properties of porous media used in proton exchange membrane (PEM) fuel cells. The liquid and gas phase relative permeability of porous media used in PEM fuel cells was measured...

Wang, Xuhai

2010-01-01T23:59:59.000Z

225

Final Scientific Report : Development of Transition Metal/ Chalcogen Based Cathode Catalysts for PEM Fuel Cells  

SciTech Connect (OSTI)

The aim of this project was to investigate the potential for using base metal sulfides and selenides as low cost replacements for precious metal catalysts, such as platinum, currently being used in PEM fuel cells. The approach was to deposit thin films of the materials to be evaluated onto inert electrodes and evaluate their activity for the cathode reaction (oxygen reduction) as well as ex-situ structural and compositional characterization. The most active materials identified are CoS2 and the 50:50 solid solution (Co,Ni)S2. However, the OCP of these materials is still considered too low, at 0.83V and 0.89V vs. RHE respectively, for testing in fuel cells. The methods employed here were necessary to compare with the activity of platinum as, when nano-dispersed on carbon supports, the active surface area of these materials is difficult to measure, making comparisons inaccurate. This research adds to the knowledge of potential candidates for platinum replacement in order to reduce the cost of PEM fuel cell technology and promote commercialization. Although the fabrication methods employed here are strictly experimental, methods were also developed to produce nano-dispersed catalysts with similar compositions, structure and activity. Cycling of these catalysts to highly oxidizing potentials resulted in an increase of the open circuit voltage to approach that of platinum, however, it proved difficult to determine why using these dispersed materials. The potential for non-precious, non-metallic, low cost, compound catalysts for PEM fuel cells has been investigated and demonstrated.

Campbell, Stephen, A.

2008-02-29T23:59:59.000Z

226

System Design of a Natural Gas PEM Fuel Cell Power Plant for Buildings  

SciTech Connect (OSTI)

The following conclusions are made based on this analysis effort: (1) High-temperature PEM data are not available; (2) Stack development effort for Phase II is required; (3) System results are by definition preliminary, mostly due to the immaturity of the high-temperature stack; other components of the system are relatively well defined; (4) The Grotthuss conduction mechanism yields the preferred system characteristics; the Grotthuss conduction mechanism is also much less technically mature than the vehicle mechanism; (5) Fuel processor technology is available today and can be procured for Phase II (steam or ATR); (6) The immaturity of high-temperature membrane technology requires that a robust system design be developed in Phase II that is capable of operating over a wide temperature and pressure range - (a) Unpressurized or Pressurized PEM (Grotthuss mechanism) at 140 C, Highest temperature most favorable, Lowest water requirement most favorable, Pressurized recommended for base loaded operation, Unpressurized may be preferred for load following; (b) Pressurized PEM (vehicle mechanism) at about 100 C, Pressure required for saturation, Fuel cell technology currently available, stack development required. The system analysis and screening evaluation resulted in the identification of the following components for the most promising system: (1) Steam reforming fuel processor; (2) Grotthuss mechanism fuel cell stack operating at 140 C; (3) Means to deliver system waste heat to a cogeneration unit; (4) Pressurized system utilizing a turbocompressor for a base-load power application. If duty cycling is anticipated, the benefits of compression may be offset due to complexity of control. In this case (and even in the base loaded case), the turbocompressor can be replaced with a blower for low-pressure operation.

Joe Ferrall, Tim Rehg, Vesna Stanic

2000-09-30T23:59:59.000Z

227

Platinum-Loading Reduction in PEM Fuel Cells - Energy Innovation Portal  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006Photovoltaic Theory andVelocityPlatinum-Loading Reduction in PEM

228

Manufacturing R&D of PEM Fuel Cells | 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 RankCombustion | Department of Energy Low-TemperatureEnergyAllPre-SolicitationEnergyPEM Fuel

229

Final Report: Development of a Thermal and Water Management System for PEM Fuel Cell  

SciTech Connect (OSTI)

This final program report is prepared to provide the status of program activities performed over the period of 9 years to develop a thermal and water management (TWM) system for an 80-kW PEM fuel cell power system. The technical information and data collected during this period are presented in chronological order by each calendar year. Balance of plant (BOP) components of a PEM fuel cell automotive system represents a significant portion of total cost based on the 2008 study by TIAX LLC, Cambridge, MA. The objectives of this TWM program were two-fold. The first objective was to develop an advanced cooling system (efficient radiator) to meet the fuel cell cooling requirements. The heat generated by the fuel cell stack is a low-quality heat (small difference between fuel cell stack operating temperature and ambient air temperature) that needs to be dissipated to the ambient air. To minimize size, weight, and cost of the radiator, advanced fin configurations were evaluated. The second objective was to evaluate air humidification systems which can meet the fuel cell stack inlet air humidity requirements. The moisture from the fuel cell outlet air is transferred to inlet air, thus eliminating the need for an outside water source. Two types of humidification devices were down-selected: one based on membrane and the other based on rotating enthalpy wheel. The sub-scale units for both of these devices have been successfully tested by the suppliers. This project addresses System Thermal and Water Management.

Zia Mirza, Program Manager

2011-12-06T23:59:59.000Z

230

A Mathematical Model for Predicting the Life of PEM Fuel Cell Membranes Subjected to Hydration Cycling  

E-Print Network [OSTI]

Under typical PEM fuel cell operating conditions, part of membrane electrode assembly is subjected to humidity cycling due to variation of inlet gas RH and/or flow rate. Cyclic membrane hydration/dehydration would cause cyclic swelling/shrinking of the unconstrained membrane. In a constrained membrane, it causes cyclic stress resulting in mechanical failure in the area adjacent to the gas inlet. A mathematical modeling framework for prediction of the lifetime of a PEM FC membrane subjected to hydration cycling is developed in this paper. The model predicts membrane lifetime as a function of RH cycling amplitude and membrane mechanical properties. The modeling framework consists of three model components: a fuel cell RH distribution model, a hydration/dehydration induced stress model that predicts stress distribution in the membrane, and a damage accrual model that predicts membrane life-time. Short descriptions of the model components along with overall framework are presented in the paper. The model was used for lifetime prediction of a GORE-SELECT membrane.

S. F. Burlatsky; M. Gummalla; J. O'Neill; V. V. Atrazhev; A. N. Varyukhin; D. V. Dmitriev; N. S. Erikhman

2013-06-19T23:59:59.000Z

231

On-Board Vehicle, Cost Effective Hydrogen Enhancement Technology for Transportation PEM Fuel Cells  

SciTech Connect (OSTI)

Final Report of On-Board Vehicle, Cost Effective Hydrogen Enhancement Technology for Transportation PEM Fuel Cells. The objective of this effort was to technologically enable a compact, fast start-up integrated Water Gas Shift-Pd membrane reactor for integration into an On Board Fuel Processing System (FPS) for an automotive 50 kWe PEM Fuel Cell (PEM FC). Our approach was to: (1) use physics based reactor and system level models to optimize the design through trade studies of the various system design and operating parameters; and (2) synthesize, characterize and assess the performance of advanced high flux, high selectivity, Pd alloy membranes on porous stainless steel tubes for mechanical strength and robustness. In parallel and not part of this program we were simultaneously developing air tolerant, high volumetric activity, thermally stable Water Gas Shift catalysts for the WGS/membrane reactor. We identified through our models the optimum WGS/membrane reactor configuration, and best Pd membrane/FPS and PEM FC integration scheme. Such a PEM FC power plant was shown through the models to offer 6% higher efficiency than a system without the integrated membrane reactor. The estimated FPS response time was < 1 minute to 50% power on start-up, 5 sec transient response time, 1140 W/L power density and 1100 W/kg specific power with an estimated production cost of $35/kW. Such an FPS system would have a Catalytic Partial Oxidation System (CPO) rather than the slower starting Auto-Thermal Reformer (ATR). We found that at optimum WGS reactor configuration that H{sub 2} recovery efficiencies of 95% could be achieved at 6 atm WGS pressure. However optimum overall fuel to net electrical efficiency ({approx}31%) is highest at lower fuel processor efficiency (67%) with 85% H{sub 2} recovery because less parasitic power is needed. The H{sub 2} permeance of {approx}45 m{sup 3}/m{sup 2}-hr-atm{sup 0.5} at 350 C was assumed in these simulations. In the laboratory we achieved a H{sub 2} permeance of 50 m{sup 3}/(m{sup 2}-hr-atm{sup 0.5}) with a H{sub 2}/N{sub 2} selectivity of 110 at 350 C with pure Pd. We also demonstrated that we could produce Pd-Ag membranes. Such alloy membranes are necessary because they aren't prone to the Pd-hydride {alpha}-{beta} phase transition that is known to cause membrane failure in cyclic operation. When funding was terminated we were on track to demonstrated Pd-Ag alloy deposition on a nano-porous ({approx}80 nm) oxide layer supported on porous stainless steel tubing using a process designed for scale-up.

Thomas H. Vanderspurt; Zissis Dardas; Ying She; Mallika Gummalla; Benoit Olsommer

2005-12-30T23:59:59.000Z

232

Modeling and Control for PEM Fuel Cell Stack System I Jay T. Pukrushpan, Anna G. Stefanopoulou, Huei Peng  

E-Print Network [OSTI]

Modeling and Control for PEM Fuel Cell Stack System I Jay T. Pukrushpan, Anna G. Stefanopoulou~umich, edu, hpeng@umich, edu Abstract A nonlinear fuel cell system dynamic model that is suit- able, the reactant partial pres- sures. Characterization of the Fuel Cell polarization curves based on time varying

Peng, Huei

233

A Parametric Study of Cathode Catalyst Layer Structural Parameters on the Performance of a PEM Fuel Cell  

E-Print Network [OSTI]

exchange membrane fuel cell (PEMFC) and how changes in its structural parameters affect performance. These results give useful guidelines for manufactures of PEMFC catalyst layers. Keywords: PEM fuel cell In a proton exchange membrane fuel cell (or PEMFC), electrical energy is generated directly through

Stockie, John

234

Pore Formation by In Situ Etching of Nanorod PEM Fuel Cell M. D. Gasda, G. A. Eisman,* and D. Gallz  

E-Print Network [OSTI]

Pore Formation by In Situ Etching of Nanorod PEM Fuel Cell Electrodes M. D. Gasda, G. A. Eisman a significant fraction of the overall cost of the fuel cell system, and much effort has therefore been directed electrolyte membranes for testing as cathode electrodes in fuel cells. The rods were etched within fully

Gall, Daniel

235

Water management studies in PEM fuel cells, part IV: Effects of channel surface wettability, geometry and orientation on the  

E-Print Network [OSTI]

Water management studies in PEM fuel cells, part IV: Effects of channel surface wettability in the commercialization of proton exchange membrane fuel cells (PEMFCs) due to its association with the performance, cost-phase flow in parallel gas channels of proton exchange membrane fuel cells (PEMFCs) are investigated. Ex situ

Kandlikar, Satish

236

Oxygen transport resistance correlated to liquid water saturation in the gas diffusion layer of PEM fuel cells  

E-Print Network [OSTI]

22 November 2013 Accepted 24 December 2013 Keywords: Fuel cells PEM Diffusion Saturation Neutron than 0.15 gPt kWÃ?1 will not be cost competitive. As a result, fuel cell researchers are exploring fuel cells Jon P. Owejan a,b, , Thomas A. Trabold c , Matthew M. Mench b a SUNY Alfred State College

Mench, Matthew M.

237

PEM fuel cell stack performance using dilute hydrogen mixture. Implications on electrochemical engine system performance and design  

SciTech Connect (OSTI)

Onboard fuel processing to generate a hydrogen-rich fuel for PEM fuel cells is being considered as an alternative to stored hydrogen fuel for transportation applications. If successful, this approach, contrasted to operating with onboard hydrogen, utilizes the existing fuels infrastructure and provides required vehicle range. One attractive, commercial liquid fuels option is steam reforming of methanol. However, expanding the liquid methanol infrastructure will take both time and capital. Consequently technology is also being developed to utilize existing transportation fuels, such as gasoline or diesel, to power PEM fuel cell systems. Steam reforming of methanol generates a mixture with a dry gas composition of 75% hydrogen and 25% carbon dioxide. Steam reforming, autothermal reforming, and partial oxidation reforming of C{sub 2} and larger hydrocarbons produces a mixture with a more dilute hydrogen concentration (65%-40%) along with carbon dioxide ({approx}20%) and nitrogen ({approx}10%-40%). Performance of PEM fuel cell stacks on these dilute hydrogen mixtures will affect the overall electrochemical engine system design as well as the overall efficiency. The Los Alamos Fuel Cell Stack Test facility was used to access the performance of a PEM Fuel cell stack over the range of gas compositions chosen to replicate anode feeds from various fuel processing options for hydrocarbon and alcohol fuels. The focus of the experiments was on the anode performance with dilute hydrogen mixtures with carbon dioxide and nitrogen diluents. Performance with other anode feed contaminants, such as carbon monoxide, are not reported here.

Inbody, M.A.; Vanderborgh, N.E.; Hedstrom, J.C.; Tafoya, J.I. [Los Alamos National Lab., NM (United States)

1996-12-31T23:59:59.000Z

238

Water management studies in PEM fuel cells, Part II: Ex situ investigation of flow maldistribution, pressure drop  

E-Print Network [OSTI]

by externally humidified air and hydrogen gas streams, must be present within the fuel cell to maintain 4 5 6 #12;a fuel cell blocks gas transport pathways in the catalyst layers, gas diffusion layersWater management studies in PEM fuel cells, Part II: Ex situ investigation of flow maldistribution

Kandlikar, Satish

239

Surface Self-Diffusion and Mean Displacement of Hydrogen on Graphite and a PEM Fuel Cell Catalyst Support  

E-Print Network [OSTI]

Surface Self-Diffusion and Mean Displacement of Hydrogen on Graphite and a PEM Fuel Cell Catalyst molecules and a carbon material commonly used in polymer electrolyte membrane fuel cells (PEMFC), called XC coefficient at each temperature. At 350 K, a typical fuel cell temperature, the temperature function

Kjelstrup, Signe

240

Water management studies in PEM fuel cells, Part I: Fuel cell design and in situ water distributions  

E-Print Network [OSTI]

schematically in Fig. 1, a fuel cell supplies two reactant streams, consisting of a fuel (hydrogen, H2Water management studies in PEM fuel cells, Part I: Fuel cell design and in situ water. Trabolda, * a General Motors Fuel Cell Laboratory, 10 Carriage Street, Honeoye Falls, New York, USA b

Kandlikar, Satish

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

PEM fuel cellstack development based on membrane-electrode assemblies of ultra-low platinum loadings  

SciTech Connect (OSTI)

Attempt is made to scale-up single cell technology, based on ultra-low platinum loadings, to develop a polymer electrolyte membrane fuel cell stack for stationary power generation.

Zawodzinski, C.; Wilson, M.S.; Gottesfeld, S.

1995-09-01T23:59:59.000Z

242

Transportation and Stationary Power Integration Workshop: A California...  

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

A California Perspective Transportation and Stationary Power Integration Workshop: A California Perspective Overview of California regulations, latest funded hydrogen stations, and...

243

Abatement of Air Pollution: Permit to Construct and Operate Stationary...  

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

Permits are required for the construction or major modification of a stationary source or emission unit. Some exemptions apply. These regulations describe permit requirements,...

244

Power Generating Stationary Engines Nox Control: A Closed Loop...  

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

A Low-Cost Continuous Emissions Monitoring System for Mobile and Stationary Engine SCRDPF ApplicationsData-Logger for Vehicle Data Acquisition Active DPF for Off-Road...

245

Fuel Quality Issues in Stationary Fuel Cell Systems  

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

Quality Issues in Stationary Fuel Cell Systems ANLCSEFCTFQ-2011-11 Chemical Sciences and Engineering Division Availability of This Report This report is available, at no cost,...

246

Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview...  

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

560-49072 September 2010 Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis Robert Remick National Renewable Energy Laboratory Douglas Wheeler...

247

Evaluation of Stationary Fuel Cell Deployments, Costs, and Fuels (Presentation)  

SciTech Connect (OSTI)

This presentation summarizes NREL's technology validation of stationary fuel cell systems and presents data on number of deployments, system costs, and fuel types.

Ainscough, C.; Kurtz, J.; Peters, M.; Saur, G.

2013-10-01T23:59:59.000Z

248

an inverse boundary value problem for the stationary transport ...  

E-Print Network [OSTI]

outer normal to ?X at x ? ?X. Let us denote by f the solution (if exists) to the following boundary value problem for the stationary linear transport (Boltzmann)

249

Final Project Report: Development of Micro-Structural Mitigation Strategies for PEM Fuel Cells: Morphological Simulations and Experimental Approaches  

SciTech Connect (OSTI)

The durability of PEM fuel cells is a primary requirement for large scale commercialization of these power systems in transportation and stationary market applications that target operational lifetimes of 5,000 hours and 40,000 hours by 2015, respectively. Key degradation modes contributing to fuel cell lifetime limitations have been largely associated with the platinum-based cathode catalyst layer. Furthermore, as fuel cells are driven to low cost materials and lower catalyst loadings in order to meet the cost targets for commercialization, the catalyst durability has become even more important. While over the past few years significant progress has been made in identifying the underlying causes of fuel cell degradation and key parameters that greatly influence the degradation rates, many gaps with respect to knowledge of the driving mechanisms still exist; in particular, the acceleration of the mechanisms due to different structural compositions and under different fuel cell conditions remains an area not well understood. The focus of this project was to address catalyst durability by using a dual path approach that coupled an extensive range of experimental analysis and testing with a multi-scale modeling approach. With this, the major technical areas/issues of catalyst and catalyst layer performance and durability that were addressed are: 1. Catalyst and catalyst layer degradation mechanisms (Pt dissolution, agglomeration, Pt loss, e.g. Pt in the membrane, carbon oxidation and/or corrosion). a. Driving force for the different degradation mechanisms. b. Relationships between MEA performance, catalyst and catalyst layer degradation and operational conditions, catalyst layer composition, and structure. 2. Materials properties a. Changes in catalyst, catalyst layer, and MEA materials properties due to degradation. 3. Catalyst performance a. Relationships between catalyst structural changes and performance. b. Stability of the three-phase boundary and its effect on performance/catalyst degradation. The key accomplishments of this project are: • The development of a molecular-dynamics based description of the carbon supported-Pt and ionomer system • The development of a composition-based, 1D-statistical Unit Cell Performance model • A modified and improved multi-pathway ORR model • An extension of the existing micro-structural catalyst model to transient operation • The coupling of a Pt Dissolution model to the modified ORR pathway model • The Development A Semi-empirical carbon corrosion model • The integration and release of an open-source forward predictive MEA performance and degradation model • Completion of correlations of BOT (beginning of test) and EOT (end of test) performance loss breakdown with cathode catalyst layer composition, morphology, material properties, and operational conditions • Catalyst layer durability windows and design curves • A design flow path of interactions from materials properties and catalyst layer effective properties to performance loss breakdown for virgin and degraded catalyst layers In order to ensure the best possible user experience we will perform a staged release of the software leading up to the webinar scheduled in October 2013. The release schedule will be as follows (please note that the manual will be released with the beta release as direct support is provided in Stage 1): • Stage 0 - Internal Ballard Release o Cross check of compilation and installation to ensure machine independence o Implement code on portable virtual machine to allow for non-UNIX use (pending) • Stage 1 - Alpha Release o The model code will be made available via a GIT, sourceforge, or other repository (under discussion at Ballard) for download and installation by a small pre-selected group of users o Users will be given three weeks to install, apply, and evaluate features of the code, providing feedback on issues or software bugs that require correction prior to beta release • Stage 2 - Beta Release o The model code repository is opened to the general public on a beta release c

Wessel, Silvia [Ballard Materials Products] [Ballard Materials Products; Harvey, David [Ballard Materials Products] [Ballard Materials Products

2013-06-28T23:59:59.000Z

250

Separable geodesic action slicing in stationary spacetimes  

E-Print Network [OSTI]

A simple observation about the action for geodesics in a stationary spacetime with separable geodesic equations leads to a natural class of slicings of that spacetime whose orthogonal geodesic trajectories represent freely falling observers. The time coordinate function can then be taken to be the observer proper time, leading to a unit lapse function. This explains some of the properties of the original Painlev\\'e-Gullstrand coordinates on the Schwarzschild spacetime and their generalization to the Kerr-Newman family of spacetimes, reproducible also locally for the G\\"odel spacetime. For the static spherically symmetric case the slicing can be chosen to be intrinsically flat with spherically symmetric geodesic observers, leaving all the gravitational field information in the shift vector field.

Donato Bini; Andrea Geralico; Robert T. Jantzen

2014-08-22T23:59:59.000Z

251

Stationary turbine component with laminated skin  

DOE Patents [OSTI]

A stationary turbine engine component, such as a turbine vane, includes a internal spar and an external skin. The internal spar is made of a plurality of spar laminates, and the external skin is made of a plurality of skin laminates. The plurality of skin laminates interlockingly engage the plurality of spar laminates such that the external skin is located and held in place. This arrangement allows alternative high temperature materials to be used on turbine engine components in areas where their properties are needed without having to make the entire component out of such material. Thus, the manufacturing difficulties associated with making an entire component of such a material and the attendant high costs are avoided. The skin laminates can be made of advanced generation single crystal superalloys, intermetallics and refractory alloys.

James, Allister W. (Orlando, FL)

2012-08-14T23:59:59.000Z

252

A Novel Non-Platinum Group Electrocatalyst for PEM Fuel Cell Application  

SciTech Connect (OSTI)

Precious-metal catalysts (predominantly Pt or Pt-based alloys supported on carbon) have traditionally been used to catalyze the electrode reactions in polymer electrolyte membrane (PEM) fuel cells. However as PEM fuel systems begin to approach commercial reality, there is an impending need to replace Pt with a lower cost alternative. The present study investigates the performance of a carbon-supported tantalum oxide material as a potential oxygen reduction reaction (ORR) catalyst for use on the cathode side of the PEM fuel cell membrane electrode assembly. Although bulk tantalum oxide tends to exhibit poor electrochemical performance due to limited electrical conductivity, it displays a high oxygen reduction potential; one that is comparable to Pt. Analysis of the Pourbaix electrochemical equilibrium database also indicates that tantalum oxide (Ta2O5) is chemically stable under the pH and applied potential conditions to which the cathode catalyst is typically exposed during stack operation. Nanoscale tantalum oxide catalysts were fabricated using two approaches, by reactive oxidation sputtering and by direct chemical synthesis, each carried out on a carbon support material. Nanoscale tantalum oxide particles measuring approximately 6nm in size that were sputtered onto carbon paper exhibited a mass-specific current density as high as one-third that of Pt when measured at 0.6V vs. NHE. However because of the two-dimensional nature of this particle-on-paper structure, which limits the overall length of the triple phase boundary junctions where the oxide, carbon paper, and aqueous electrolyte meet, the corresponding area-specific current density was quite low. The second synthesis approach yielded a more extended, three-dimensional structure via chemical deposition of nanoscale tantalum oxide particles on carbon powder. These catalysts exhibited a high ORR onset potential, comparable to that of Pt, and displayed a significant improvement in the area-specific current density. Overall, the highest mass-specific current density of the carbon-powder supported catalyst was ~ 9% of that of Pt.

Kim, Jin Yong; Oh, Takkeun; Shin, Yongsoon; Bonnett, Jeff F.; Weil, K. Scott

2011-04-01T23:59:59.000Z

253

Stationary Applications of Energy Storage Technologies for Transit Systems  

E-Print Network [OSTI]

Stationary Applications of Energy Storage Technologies for Transit Systems Paul Radcliffe, James S, Ontario, Canada paul.radcliffe@utoronto.ca Abstract ­ Stationary energy storage technologies can improve the efficiency of transit systems. In this paper, three different demonstrations of energy storage technologies

Shu, Lily H.

254

Bootstrapping a Sustainable North American PEM Fuel Cell Industry: Could a Federal Acquisition Program Make a Difference?  

SciTech Connect (OSTI)

The North American Proton Exchange Membrane (PEM) fuel cell industry may be at a critical juncture. A large-scale market for automotive fuel cells appears to be several years away and in any case will require a long-term, coordinated commitment by government and industry to insure the co-evolution of hydrogen infrastructure and fuel cell vehicles (Greene et al., 2008). The market for non-automotive PEM fuel cells, on the other hand, may be much closer to commercial viability (Stone, 2006). Cost targets are less demanding and manufacturers appear to be close, perhaps within a factor of two, of meeting them. Hydrogen supply is a significant obstacle to market acceptance but may not be as great a barrier as it is for hydrogen-powered vehicles due to the smaller quantities of hydrogen required. PEM fuel cells appear to be potentially competitive in two markets: (1) Backup power (BuP) supply, and (2) electrically-powered MHE (Mahadevan et al., 2007a, 2007b). There are several Original Equipment Manufacturers (OEMs) of PEM fuel cell systems for these applications but production levels have been quite low (on the order of 100-200 per year) and cumulative production experience is also limited (on the order of 1,000 units to date). As a consequence, costs remain above target levels and PEM fuel cell OEMs are not yet competitive in these markets. If cost targets can be reached and acceptable solutions to hydrogen supply found, a sustainable North American PEM fuel cell industry could be established. If not, the industry and its North American supply chain could disappear within a year or two. The Hydrogen Fuel Cell and Infrastructure Technologies (HFCIT) program of the U.S. Department of Energy (DOE) requested a rapid assessment of the potential for a government acquisition program to bootstrap the market for non-automotive PEM fuel cells by driving down costs via economies of scale and learning-by-doing. The six week study included in-depth interviews of three manufacturers, visits to two production facilities, review of the literature on potential markets in North America and potential federal government procurements, development of a cost model reflecting economies of scale and learning-by-doing, and estimation of the impact of federal PEM fuel cell procurements on fuel cell system costs and the evolution of private market demand. This report presents the findings of that study. Section 2 outlines the status of the industry and describes potential markets based on interviews of manufacturers and the existing literature. Section 3 describes the modeling methodology including key premises and assumptions, and presents estimates of market evolution under four scenarios: (1) Base Case with no federal government procurement program, (2) Scenario 1, an aggressive program beginning with less than 200 units procured in 2008 ramping up to more than 2,000 units in 2012, (3) Scenario 2 which is identical to Scenario 1 except that the private market is assumed to be twice as sensitive to price, and (4) Scenario 3, a delayed, smaller federal procurement program beginning in 2011 increasing to a maximum of just over 1,000 units per year in 2012. The analysis suggests that the aggressive program of Scenario 1 would likely stimulate a sustainable, competitive North American non-automotive PEM fuel cell industry. Given plausible assumptions about learning rates and scale economies, the procurements assumed in Scenario 1 appear to be sufficient to drive down costs to target levels. These findings are conditional on the evolution of acceptable hydrogen supply strategies, which were not explicitly analyzed in this study. Success is less certain under Scenarios 2 and 3, and there appears to be a strong probability that existing OEMs would not survive until 2011. In the Base Case, no program, a viable North American industry does not emerge before 2020.

Greene, David L [ORNL; Duleep, Dr. K. G. [Energy and Environmental Analysis, Inc., an ICF Company

2008-10-01T23:59:59.000Z

255

Iron-based alloy and nitridation treatment for PEM fuel cell bipolar plates  

DOE Patents [OSTI]

A corrosion resistant electrically conductive component that can be used as a bipolar plate in a PEM fuel cell application is composed of an alloy substrate which has 10-30 wt. % Cr, 0.5 to 7 wt. % V, and base metal being Fe, and a continuous surface layer of chromium nitride and vanadium nitride essentially free of base metal. A oxide layer of chromium vanadium oxide can be disposed between the alloy substrate and the continuous surface nitride layer. A method to prepare the corrosion resistant electrically conductive component involves a two-step nitridization sequence by exposing the alloy to a oxygen containing gas at an elevated temperature, and subsequently exposing the alloy to an oxygen free nitrogen containing gas at an elevated temperature to yield a component where a continuous chromium nitride layer free of iron has formed at the surface.

Brady, Michael P. (Oak Ridge, TN) [Oak Ridge, TN; Yang, Bing (Oak Ridge, TN) [Oak Ridge, TN; Maziasz, Philip J. (Oak Ridge, TN) [Oak Ridge, TN

2010-11-09T23:59:59.000Z

256

Vessel Cold-Ironing Using a Barge Mounted PEM Fuel Cell: Project Scoping and Feasibility.  

SciTech Connect (OSTI)

A barge-mounted hydrogen-fueled proton exchange membrane (PEM) fuel cell system has the potential to reduce emissions and fossil fuel use of maritime vessels in and around ports. This study determines the technical feasibility of this concept and examines specific options on the U.S. West Coast for deployment practicality and potential for commercialization.The conceptual design of the system is found to be straightforward and technically feasible in several configurations corresponding to various power levels and run times.The most technically viable and commercially attractive deployment options were found to be powering container ships at berth at the Port of Tacoma and/or Seattle, powering tugs at anchorage near the Port of Oakland, and powering refrigerated containers on-board Hawaiian inter-island transport barges. Other attractive demonstration options were found at the Port of Seattle, the Suisun Bay Reserve Fleet, the California Maritime Academy, and an excursion vessel on the Ohio River.

Pratt, Joseph William; Harris, Aaron P

2013-01-01T23:59:59.000Z

257

High performance robust F-doped tin oxide based oxygen evolution electro-catalysts for PEM based water electrolysis  

SciTech Connect (OSTI)

Identification and development of non-noble metal based electro-catalysts or electro-catalysts comprising compositions with significantly reduced amounts of expensive noble metal contents (e.g. IrO{sub 2}, Pt) with comparable electrochemical performance to the standard noble metal/metal oxide for proton exchange membrane (PEM) based water electrolysis would signify a major breakthrough in hydrogen generation via water electrolysis. Development of such systems would lead to two primary outcomes: first, a reduction in the overall capital costs of PEM based water electrolyzers, and second, attainment of the targeted hydrogen production costs (<$3.00/gge delivered by 2015) comparable to conventional liquid fuels. In line with these goals, by exploiting a two-pronged theoretical first principles and experimental approach herein, we demonstrate for the very first time a solid solution of SnO{sub 2}:10 wt% F containing only 20 at.% IrO{sub 2} [e.g. (Sn{sub 0.80}Ir{sub 0.20})O{sub 2}:10F] displaying remarkably similar electrochemical activity and comparable or even much improved electrochemical durability compared to pure IrO{sub 2}, the accepted gold standard in oxygen evolution electro-catalysts for PEM based water electrolysis. We present the results of these studies.

Datta, Moni Kanchan; Kadakia, Karan; Velikokhatnyi, Oleg I.; Jampani, Prashanth H.; Chung, Sung Jae; Poston, James A.; Manivannan, Ayyakkannu; Kumta, Prashant N.

2013-01-01T23:59:59.000Z

258

Geophysics-based method of locating a stationary earth object  

DOE Patents [OSTI]

A geophysics-based method for determining the position of a stationary earth object uses the periodic changes in the gravity vector of the earth caused by the sun- and moon-orbits. Because the local gravity field is highly irregular over a global scale, a model of local tidal accelerations can be compared to actual accelerometer measurements to determine the latitude and longitude of the stationary object.

Daily, Michael R. (Albuquerque, NM); Rohde, Steven B. (Corrales, NM); Novak, James L. (Albuquerque, NM)

2008-05-20T23:59:59.000Z

259

Static- and Stationary-complete Spacetimes: Algebraic and Causal Structures  

E-Print Network [OSTI]

This is intended as an analysis of the global properties of static and stationary spacetimes with complete (timelike) Killing field, with particular attention to quotients by group actions. This is presented in terms of algebraic structures which are fairly simple for the static case and more involved for the stationary case; the most important tool, the fundamental cocycle, is a cohomological class for static spacetimes but of somewhat looser structure in the stationary case. In particular: (1) A new measurement, similar to the spacetime interval in Minkowski space, is devised for detecting whether two points are causally related in a stationary spacetime; this proves very useful for analysis. (2) All stationary spacetimes are categorized by how they behave with respect to the fundamental cocycle; this enables a complete characterization of global causality properties. (3) It is shown how these tools determine whether global hyperbolicity of a stationary spacetime is inherited by its quotients. (4) Examples are examined in detail, a large range including both ones of mathematical curiosity and ones of physical interest, such as cosmic strings in flat, accelerated, Schwarzschild, Kerr, and other backgrounds.

Steven G. Harris

2014-12-24T23:59:59.000Z

260

THE EFFECT OF LOW CONCENTRATIONS OF TETRACHLOROETHYLENE ON THE PERFORMANCE OF PEM FUEL CELLS  

SciTech Connect (OSTI)

Polymer electrolyte membrane (PEM) fuel cells use components that are susceptible to contaminants in the fuel stream. To ensure fuel quality, standards are being set to regulate the amount of impurities allowable in fuel. The present study investigates the effect of chlorinated impurities on fuel cell systems using tetrachloroethylene (PCE) as a model compound for cleaning and degreasing agents. Concentrations between 0.05 parts per million (ppm) and 30 ppm were studied. We show how PCE causes rapid drop in cell performances for all concentrations including 0.05 ppm. At concentrations of 1 and 0.05 ppm, PCE poisoned the cell at a rate dependent on the dosage of the contaminant delivered to the cell. PCE appears to affect the cell when the cell potential was over potentials higher than approximately 0.2 V. No effects were observed at voltages around or below 0.2 V and the cells could be recovered from previous poisoning performed at higher potentials. Recoveries at those low voltages could be induced by changing the operating voltage or by purging the system. Poisoning did not appear to affect the membrane conductivity. Measurements with long-path length IR results suggested catalytic decomposition of the PCE by hydrogen over the anode catalyst.

COLON-MERCHADO, H.; MARTINEZ-RODRIGUEZ, M.; FOX, E.; RHODES, W.; MCWHORTER, C.; GREENWAY, S.

2011-04-18T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Binary Black Holes in Quasi-Stationary Circular Orbits  

E-Print Network [OSTI]

We propose a method of determining solutions to the constraint equations of General Relativity approximately describing binary black holes in quasi-stationary circular orbits. Black holes with arbitrary linear momenta are constructed in the manner suggested by Brandt and Brugmann. The quasi-stationary circular orbits are determined by local minima in the ADM mass in a manner similar to Baumgarte and Cook; however, rather than fixing the area of the apparent horizon, we fix the value of the bare masses of the holes. We numerically generate an evolutionary sequence of quasi-stationary circular orbits up to and including the innermost stable circular orbit. We compare our results with post-Newtonian expectations as well as the results of Cook and Baumgarte. We also generate additional numerical results describing the dynamics of the geometry due to the emission of gravitational radiation.

Brian D. Baker

2002-05-18T23:59:59.000Z

262

Purely electrical damping of vibrations in arbitrary PEM plates: a mixed non-conforming FEM-Runge-Kutta time evolution analysis  

E-Print Network [OSTI]

A new numerical code, based upon a mixed FEM-Runge-Kutta method, is used for the analysis and design of plane 2-D smart structures. The code is applied to the study of arbitrarily shaped PEM plates, based on a weak formulation of their governing equations, [17]. The optimal parameters needed to synthesize appropriate electric networks are computed, and the overall performances of such plates are investigated. Two examples are studied: firstly, a simple case is used to test the main features of the code; secondly, a more complex PEM plate is designed and analyzed by means of the proposed numerical approach.

F. dell'Isola; E. Santini; D. Vigilante

2010-07-09T23:59:59.000Z

263

2004 DOE Hydrogen, Fuel Cells & Infrastructure Technologies Program Review Presentation COST AND PERFORMANCE ENHANCEMENTS FOR A PEM FUEL CELL TURBOCOMPRESSOR  

SciTech Connect (OSTI)

The objective is to assist the Department of Energy in the development of a low cost, reliable and high performance air compressor/expander. Technical Objective 1: Perform a turbocompressor systems PEM fuel cell trade study to determine the enhanced turbocompressor approach. Technical Objective 2: Using the results from technical objective 1, an enhanced turbocompressor will be fabricated. The design may be modified to match the flow requirements of a selected fuel cell system developer. Technical Objective 3: Design a cost and performance enhanced compact motor and motor controller. Technical Objective 4: Turbocompressor/motor controller development.

Mark K. Gee

2004-04-01T23:59:59.000Z

264

Simulation of dust streaming in toroidal traps: Stationary flows  

SciTech Connect (OSTI)

Molecular-dynamic simulations were performed to study dust motion in a toroidal trap under the influence of the ion drag force driven by a Hall motion of the ions in E x B direction, gravity, inter-particle forces, and friction with the neutral gas. This article is focused on the inhomogeneous stationary streaming motion. Depending on the strength of friction, the spontaneous formation of a stationary shock or a spatial bifurcation into a fast flow and a slow vortex flow is observed. In the quiescent streaming region, the particle flow features a shell structure which undergoes a structural phase transition along the flow direction.

Reichstein, Torben; Piel, Alexander [IEAP, Christian-Albrechts-Universitaet, D-24098 Kiel (Germany)

2011-08-15T23:59:59.000Z

265

Cost Analysis of Fuel Cell Systems for Transportation Compressed Hydrogen and PEM Fuel Cell System  

SciTech Connect (OSTI)

PEMFC technology for transportation must be competitive with internal combustion engine powertrains in a number of key metrics, including performance, life, reliability, and cost. Demonstration of PEMFC cost competitiveness has its own challenges because the technology has not been applied to high volume automotive markets. The key stack materials including membranes, electrodes, bipolar plates, and gas diffusion layers have not been produced in automotive volumes to the exacting quality requirements that will be needed for high stack yields and to the evolving property specifications of high performance automotive stacks. Additionally, balance-of-plant components for air, water, and thermal management are being developed to meet the unique requirements of fuel cell systems. To address the question of whether fuel cells will be cost competitive in automotive markets, the DOE has funded this project to assess the high volume production cost of PEM fuel cell systems. In this report a historical perspective of our efforts in assessment of PEMFC cost for DOE is provided along with a more in-depth assessment of the cost of compressed hydrogen storage is provided. Additionally, the hydrogen storage costs were incorporated into a system cost update for 2004. Assessment of cost involves understanding not only material and production costs, but also critical performance metrics, i.e., stack power density and associated catalyst loadings that scale the system components. We will discuss the factors influencing the selection of the system specification (i.e., efficiency, reformate versus direct hydrogen, and power output) and how these have evolved over time. The reported costs reflect internal estimates and feedback from component developers and the car companies. Uncertainty in the cost projection was addressed through sensitivity analyses.

Eric J. Carlson

2004-10-20T23:59:59.000Z

266

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

The operating cost for the PEM Fuel Cell/Reformer energyForecasting the Costs of Automotive PEM Fuel Cells UsingCosts of Generating Power with Stationary and Motor Vehicle PEM Fuel Cell

Weinert, Jonathan X.; Lipman, Timothy

2006-01-01T23:59:59.000Z

267

A Near-Term Economic Analysis of Hydrogen Fueling Stations  

E-Print Network [OSTI]

PEM Fuel Cell Additional Equipment Installation CostsFuel Cell_PAFC Fuel Cell_PEM Power (units/ yr) Total Cost Ccosts of generating power with stationary and motor vehicle PEM fuel cell

Weinert, Jonathan X.

2005-01-01T23:59:59.000Z

268

A Near-term Economic Analysis of Hydrogen Fueling Stations  

E-Print Network [OSTI]

PEM Fuel Cell Additional Equipment Installation CostsFuel Cell_PAFC Fuel Cell_PEM Power (units/ yr) Total Cost Ccosts of generating power with stationary and motor vehicle PEM fuel cell

Weinert, Jonathan X.

2005-01-01T23:59:59.000Z

269

Air Traffic Control Using Virtual Stationary Automata Matthew D. Brown  

E-Print Network [OSTI]

Air Traffic Control Using Virtual Stationary Automata by Matthew D. Brown B.S., Massachusetts by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Arthur C. Smith Chairman, Department Committee on Graduate Students #12;Air Traffic Control Using Virtual of Engineering Abstract As air travel has become an essential part of modern life, the air traffic control system

Lynch, Nancy

270

Iteration Bounds for Finding the ?-Stationary Points for Structured ...  

E-Print Network [OSTI]

Oct 15, 2014 ... where ? = p/q with 1/p + 1/q = 1, then we prove that the new algorithms have an overall iteration complexity bound of O(1/?q) in finding an ?-stationary ...... + Mr,. (35) which means that if the perturbation is small, then the ...

2014-10-15T23:59:59.000Z

271

Ceramic stationary gas turbine development. Final report, Phase 1  

SciTech Connect (OSTI)

This report summarizes work performed by Solar Turbines Inc. and its subcontractors during the period September 25, 1992 through April 30, 1993. The objective of the work is to improve the performance of stationary gas turbines in cogeneration through implementation of selected ceramic components.

NONE

1994-09-01T23:59:59.000Z

272

No hair theorems for stationary axisymmetric black holes  

E-Print Network [OSTI]

We present a non-perturbative proof of the no hair theorems corresponding to scalar and Proca fields for stationary axisymmetric de Sitter black hole spacetimes. Our method also applies to asymptotically flat and under a reasonable assumption, to asymptotically anti-de Sitter spacetimes.

Sourav Bhattacharya; Amitabha Lahiri

2011-05-20T23:59:59.000Z

273

BREAKOUT GROUP 4: LOW TEMPERATURE FUEL CELL SYSTEM BOP & FUEL PROCESSORS FOR STATIONARY AND AUTOMOTIVE PARTICIPANTS  

E-Print Network [OSTI]

Hydrogen Heat and Power (CHHP), Combined Heat and Power (CHP). · Operating and Maintenance costs are high · Combine hydrogen purification and compression · Cost effective H2 separation membranes ­ palladium PEM Frank Hydrogenics Jamie Holladay Pacific Northwest National Laboratory Terry Johnson Sandia National

274

FINAL REPORT FOR PSO project 5728 Title of the project: Development of more efficient and cheaper MEA's for PEM fuel cells  

E-Print Network [OSTI]

MEA's for PEM fuel cells Projekttitel på dansk: Udvikling af mere effektive og billigere MEA'er til, Technical University of Denmark (KI-DTU) IRD Fuel Cell A/S (IRD) Danish Power System Aps (DPS) Dansk Polymer.............................................................................................................................20 3.6. FUEL CELL PERFORMANCE

275

Remaining useful life estimates of a PEM fuel cell stack by including characterization-induced disturbances in a particle filter model  

E-Print Network [OSTI]

Remaining useful life estimates of a PEM fuel cell stack by including characterization- induced Besançon, France rgourive@ens2m.fr ABSTRACT: Proton Exchange Membrane Fuel Cells (PEMFC) are available, Prognostics, Remaining Useful life, Particle filter 1. Introduction Proton Exchange Membrane Fuel Cells

Paris-Sud XI, Université de

276

Investigation of Water Droplet Interaction with the Sidewalls of the Gas Channel in a PEM Fuel Cell in the Presence of Gas Flow  

E-Print Network [OSTI]

forms of hydrogen powered technologies exist and have been well-researched, fuel cells is considered efficiently in the fuel cells (4). Inefficient water removal results in flooding of the catalyst layerInvestigation of Water Droplet Interaction with the Sidewalls of the Gas Channel in a PEM Fuel Cell

Kandlikar, Satish

277

Engineered Nano-scale Ceramic Supports for PEM Fuel Cells. Tech Team Meeting Presentaion  

SciTech Connect (OSTI)

Catalyst support durability is currently a technical barrier for commercialization of polymer electrolyte membrane (PEM) fuel cells, especially for transportation applications. Degradation and corrosion of the conventional carbon supports leads to losses in active catalyst surface area and, consequently, reduced performance. As a result, the goal of this work is to develop support materials that interact strongly with Pt, yet sustain bulk-like catalytic activities with very highly dispersed particles. Ceramic materials that are prepared using conventional solid-state methods have large grain sizes and low surface areas that can only be minimally ameliorated through grinding and ball milling. Other synthesis routes to produce ceramic materials must be investigated and utilized in order to obtain desired surface areas. In this work, several different synthesis methods are being utilized to prepare electronically conductive ceramic boride, nitride, and oxide materials with high surface areas and have the potential for use as PEMFC catalyst supports. Polymer-assisted deposition (PAD) and aerosol-through plasma (A-T-P) torch are among several methods used to obtain ceramic materials with surface areas that are equal to, or exceed Vulcan XC-72R supports. Cubic Mo-based ceramic phases have been prepared with average XRD-determined crystallite sizes as low as 1.6 nm (from full profile, XRD fitting) and a BET surface area exceeding 200 m{sup 2}/g. Additionally, black, sub-stoichiometric TiO{sub 2-x}, have been prepared with an average crystallite size in the 4 nm range and surface areas exceeding 250 m{sup 2}/gr. Pt disposition using an incipient wetness approach produced materials with activity for hydrogen redox reactions and ORR. Cyclic voltammetry data will be shown for a variety of potential Pt/ceramic catalysts. Initial experiments indicate enhanced Pt metal-support interactions as well. Plane wave periodic density functional calculations (VASP) are being used to predict the thermodynamic and activation barriers for fundamental electrode processes occurring at platinum surfaces supported on thin films of the ceramic support materials. The results of this work will be used in order to optimize support properties.

Brosha, Eric L. [Los Alamos National Laboratory; Elbaz Alon, Lior [Los Alamos National Laboratory; Henson, Neil J. [Los Alamos National Laboratory; Rockward, Tommy [Los Alamos National Laboratory; Roy, Aaron [University of New Mexico; Serov, Alexey [University of New Mexico; Ward, Timothy [University of New Mexico

2012-08-13T23:59:59.000Z

278

Heat-transfer characteristics of flowing and stationary particle-bed-type fusion-reactor blankets  

SciTech Connect (OSTI)

The following five appendices are included: (1) physical properties of materials, (2) thermal entrance length Nusselt number variations, (3) stationary particle bed temperature variations, (4) falling bed experimental data and calculations, and (5) stationary bed experimental data and calculations. (MOW)

Nietert, R.E.

1983-02-01T23:59:59.000Z

279

PHYSICAL REVIEW E 85, 026211 (2012) Weakly subcritical stationary patterns: Eckhaus instability and homoclinic snaking  

E-Print Network [OSTI]

PHYSICAL REVIEW E 85, 026211 (2012) Weakly subcritical stationary patterns: Eckhaus instability from subcritical to supercritical stationary periodic patterns is described by the one of localized structures in systems exhibiting homoclinic snaking during the transition from subcriticality

Knobloch, Edgar

280

Anisotropic fluids in the case of stationary and axisymmetric spaces of General Relativity  

E-Print Network [OSTI]

We present a stationary axisymmetric solution belonging to Carter's family [A] of spaces and representing an anisotropic fluid configuration.

T. Papakostas

2001-05-03T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Stationary and Portable Fuel Cell Systems Codes and Standards Citations (Brochure)  

SciTech Connect (OSTI)

This document lists codes and standards typically used for U.S. stationary and portable fuel cell systems.

Not Available

2011-05-01T23:59:59.000Z

282

Gravitational field of a stationary circular cosmic string loop  

E-Print Network [OSTI]

Gravitational field of a stationary circular cosmic string loop has been studied in the context of full nonlinear Einstein's theory of gravity. It has been assumed that the radial and tangential stresses of the loop are equal to the energy density of the string loop. An exact solution for the system has been presented which has a singularity at a finite distance from the axis,but is regular for any other distances from the axis of the loop.

A; A. Sen; N. Banerjee

1998-06-22T23:59:59.000Z

283

Photon propagation in a stationary warp drive space-time  

E-Print Network [OSTI]

We simplify the warp drive space-time so that it becomes stationary and the distorsion becomes one-dimensional and static. We use this simplified warp drive space-time as a background for a photon field. We shall especially use the Drummond\\&Hathrell action in order to investigate the velocity effects on photons in this background. Finally, we discuss the limitations of this model.

Claes R Cramer

1995-11-01T23:59:59.000Z

284

International Stationary Fuel Cell Demonstration | 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:YearRound-UpHeatMulti-Dimensionalthe10 DOE VehicleStationary Fuel Cell Demonstration International

285

Non-stationary measurements of Chiral Magnetic Effect  

SciTech Connect (OSTI)

We discuss the Chiral Magnetic Effect from the quantum theory of measurements point of view for non-stationary measurements. The effect of anisotropy for fluctuations of electric currents in a magnetic field is addressed. It is shown that anisotropy caused by nonzero axial chemical potential is indistinguishable in this framework from anisotropy caused by finite measurement time or finite lifetime of the magnetic field, and in all cases it is related to abelian triangle anomaly. Possible P-odd effects in central heavy-ion collisions (where the Chiral Magnetic Effect is absent) are discussed in this context. This paper is dedicated to the memory of Professor Mikhail Polikarpov (1952–2013). -- Highlights: •Asymmetry in the response function for vector currents of massless fermions in the magnetic field is computed. •Asymmetry caused by axial chemical potential is practically indistinguishable from the one caused by non-stationarity. •The CME current is non-dissipative in the stationary case and dissipative in the non-stationary case. •Importance of studies of P-odd signatures in central collisions is emphasized.

Shevchenko, V.I., E-mail: vladimir.i.shevchenko@gmail.com

2013-12-15T23:59:59.000Z

286

Stationary Nonaxisymmetric Configurations of Magnetized Singular Isothermal Disks  

E-Print Network [OSTI]

Accepted.... Received...; in original form... We construct both aligned and unaligned (logarithmic spiral) stationary configurations of nonaxisymmetric magnetohydrodynamic (MHD) disks from either a full or a partial razor-thin power-law axisymmetric magnetized singular isothermal disk (MSID) that is embedded with a coplanar azimuthal magnetic field B? of a non-force-free radial scaling r?1/2 and that rotates differentially with a flat rotation curve of speed aD, where a is the isothermal sound speed and D is the dimensionless rotation parameter. Analytical solutions and stability criteria for determining D2 are derived. For aligned nonaxisymmetric MSIDs, eccentric m = 1 displacements may occur at arbitrary D2 in a full MSID but are allowed only with a2D2 = C2 A /2 in a partial MSID (CA is the Alfvén speed), while each case of |m | ? 1 gives two possible values of D2 for purely azimuthal propagations of fast and slow MHD density waves (FMDWs and SMDWs) that appear stationary in an inertial frame of reference. For disk galaxies modeled by a partial MSID resulting from a massive dark-matter halo with a flat rotation curve and a2D2 ? C2 A, stationary aligned perturbations of m = 1 are not allowed. For

Yu-qing Lou

2003-01-01T23:59:59.000Z

287

2005 DOE Hydrogen Program Review PresentationCOST AND PERFORMANCE ENHANCEMENTS FOR A PEM FUEL CELL TURBOCOMPRESSOR  

SciTech Connect (OSTI)

The objectives of the program during the past year was to complete Technical Objectives 2 and 3 and initiate Technical Objective 4 are described. To assist the Department of Energy in the development of a low cost, reliable and high performance air compressor/expander. Technical Objective 1: Perform a turbocompressor systems PEM fuel cell trade study to determine the enhanced turbocompressor approach. Technical Objective 2: Using the results from technical objective 1, an enhanced turbocompressor will be fabricated. The design may be modified to match the flow requirements of a selected fuel cell system developer. Technical Objective 3: Design a cost and performance enhanced compact motor and motor controller. Technical Objective 4: Turbocompressor/motor controller development.

Mark K. Gee

2005-04-01T23:59:59.000Z

288

Symmetry groups of non-stationary planar ideal plasticity  

E-Print Network [OSTI]

This paper is a study of the Lie groups of point symmetries admitted by a system describing a non-stationary planar flow of an ideal plastic material. For several types of forces involved in the system, the infinitesimal generators which generate the Lie algebra of symmetries have been obtained. In the case of a monogenic force, the classification of one- and two- dimensional subalgebras into conjugacy classes under the action of the group of automorphisms has been accomplished. The method of symmetry reduction is applied for certain subalgebra classes in order to obtain invariant solutions.

Vincent Lamothe

2014-09-30T23:59:59.000Z

289

Longer life for glyco-based stationary engine coolants  

SciTech Connect (OSTI)

Large, stationary diesel engines used to compress natural gas that is to be transported down pipelines generate a great deal of heat. Unless this heat is dissipated efficiently, it will eventually cause an expensive breakdown. Whether the coolant uses ethylene glycol or propylene glycol, the two major causes of glycol degradation are heat and oxidation. The paper discusses inhibitors that enhance coolant service life and presents a comprehensive list of do`s and don`ts for users to gain a 20-year coolant life.

Hohlfeld, R. [Dow Chemical Co., Houston, TX (United States)

1996-07-01T23:59:59.000Z

290

Polymer electrolyte fuel cells: Potential transportation and stationary applications  

SciTech Connect (OSTI)

The application of the polymer electrolyte fuel cell (PEFC) as a primary power source in electric vehicles has received increasing attention during the last few years. This increased attention is the result of a combination of significant technical advances in this fuel cell technology and the initiation of some projects for the demonstration of a complete, PEFC-based power system a bus or in a passenger car. Such demonstration projects reflect an increase in industry's faith in the potential of this technology for transportation applications, or, at least, in the need for a detailed evaluation of this potential. Nevertheless, large scale transportation applications of PEFCs require a continued concerted effort of research on catalysis, materials and components, combined with the engineering efforts addressing the complete power system. This is required to achieve a cost effective, highly performing PEFC stack and power system. A related set of technical and cost challenges arises in the context of potential applications of PEFCs for stationary power applications, although there are clearly some differences in their nature, particularly, to do with the different types of fuels to be employed for each of these applications. We describe in this contribution some recent results of work performed by the Core Research PEFC Program at Los Alamos National Laboratory, which has addressed materials, components and single cell testing of PEFCS. Also included are some recent observations and some insights regarding the potential of this fuel cell technology for stationary Power generation.

Gottesfeld, S.

1993-01-01T23:59:59.000Z

291

Polymer electrolyte fuel cells: Potential transportation and stationary applications  

SciTech Connect (OSTI)

The application of the polymer electrolyte fuel cell (PEFC) as a primary power source in electric vehicles has received increasing attention during the last few years. This increased attention is the result of a combination of significant technical advances in this fuel cell technology and the initiation of some projects for the demonstration of a complete, PEFC-based power system a bus or in a passenger car. Such demonstration projects reflect an increase in industry`s faith in the potential of this technology for transportation applications, or, at least, in the need for a detailed evaluation of this potential. Nevertheless, large scale transportation applications of PEFCs require a continued concerted effort of research on catalysis, materials and components, combined with the engineering efforts addressing the complete power system. This is required to achieve a cost effective, highly performing PEFC stack and power system. A related set of technical and cost challenges arises in the context of potential applications of PEFCs for stationary power applications, although there are clearly some differences in their nature, particularly, to do with the different types of fuels to be employed for each of these applications. We describe in this contribution some recent results of work performed by the Core Research PEFC Program at Los Alamos National Laboratory, which has addressed materials, components and single cell testing of PEFCS. Also included are some recent observations and some insights regarding the potential of this fuel cell technology for stationary Power generation.

Gottesfeld, S.

1993-04-01T23:59:59.000Z

292

Stationary Fuel Cell System Composite Data Products: Data through Quarter 4 of 2013  

SciTech Connect (OSTI)

This report includes 25 composite data products (CDPs) produced for stationary fuel cell systems, with data through the fourth quarter of 2013.

Saur, G.; Kurtz, J.; Ainscough, C.; Peters, M.

2014-05-01T23:59:59.000Z

293

Stationary Fuel Cell Application Codes and Standards: Overview and Gap Analysis  

SciTech Connect (OSTI)

This report provides an overview of codes and standards related to stationary fuel cell applications and identifies gaps and resolutions associated with relative codes and standards.

Blake, C. W.; Rivkin, C. H.

2010-09-01T23:59:59.000Z

294

Webinar: Procuring Fuel Cells for Stationary Power: A Guide for Federal Facility Decision Makers  

Broader source: Energy.gov [DOE]

Video recording and text version of the webinar titled, Procuring Fuel Cells for Stationary Power: A Guide for Federal Facility Decision Makers, originally presented on May 8, 2012.

295

StationaryEnvironment ResidentialTransportation Premium Power Advanced High Efficiency, Quick Start Fuel  

E-Print Network [OSTI]

Premium Power Agenda STARTM (1999-2003) ­ Substrate based Transportation application Autothermal ReformerEnvironment Residential Stationary Premium Power STAR Fuel Processor · Autothermal reformer · Substrate-based catalysts

296

5 CCR 1001-5 Colorado Stationary Source Permitting and Air Pollution...  

Open Energy Info (EERE)

Colorado Stationary Source Permitting and Air Pollution Control Emission Notice Requirements Jump to: navigation, search OpenEI Reference LibraryAdd to library Reference: 5 CCR...

297

Stationary and Oscillatory Localized Patterns, and Subcritical Bifurcations Vladimir K. Vanag and Irving R. Epstein  

E-Print Network [OSTI]

Stationary and Oscillatory Localized Patterns, and Subcritical Bifurcations Vladimir K. Vanag of subcritical Hopf instability, subcritical Turing instability, and their combination. DOI: 10.1103/Phys

Epstein, Irving R.

298

Stationary Fuel Cell System Composite Data Products: Data through Quarter 2 of 2013  

SciTech Connect (OSTI)

This report includes 24 composite data products (CDPs) produced for stationary fuel cell systems, with data through the second quarter of 2013.

Ainscough, C.; Kurtz, J.; Peters, M.; Saur, G.

2013-11-01T23:59:59.000Z

299

Fuel quality issues in stationary fuel cell systems.  

SciTech Connect (OSTI)

Fuel cell systems are being deployed in stationary applications for the generation of electricity, heat, and hydrogen. These systems use a variety of fuel cell types, ranging from the low temperature polymer electrolyte fuel cell (PEFC) to the high temperature solid oxide fuel cell (SOFC). Depending on the application and location, these systems are being designed to operate on reformate or syngas produced from various fuels that include natural gas, biogas, coal gas, etc. All of these fuels contain species that can potentially damage the fuel cell anode or other unit operations and processes that precede the fuel cell stack. These detrimental effects include loss in performance or durability, and attenuating these effects requires additional components to reduce the impurity concentrations to tolerable levels, if not eliminate the impurity entirely. These impurity management components increase the complexity of the fuel cell system, and they add to the system's capital and operating costs (such as regeneration, replacement and disposal of spent material and maintenance). This project reviewed the public domain information available on the impurities encountered in stationary fuel cell systems, and the effects of the impurities on the fuel cells. A database has been set up that classifies the impurities, especially in renewable fuels, such as landfill gas and anaerobic digester gas. It documents the known deleterious effects on fuel cells, and the maximum allowable concentrations of select impurities suggested by manufacturers and researchers. The literature review helped to identify the impurity removal strategies that are available, and their effectiveness, capacity, and cost. A generic model of a stationary fuel-cell based power plant operating on digester and landfill gas has been developed; it includes a gas processing unit, followed by a fuel cell system. The model includes the key impurity removal steps to enable predictions of impurity breakthrough, component sizing, and utility needs. These data, along with process efficiency results from the model, were subsequently used to calculate the cost of electricity. Sensitivity analyses were conducted to correlate the concentrations of key impurities in the fuel gas feedstock to the cost of electricity.

Papadias, D.; Ahmed, S.; Kumar, R. (Chemical Sciences and Engineering Division)

2012-02-07T23:59:59.000Z

300

Statistics of Stationary Points of Random Finite Polynomial Potentials  

E-Print Network [OSTI]

The stationary points (SPs) of the potential energy landscapes (PELs) of multivariate random potentials (RPs) have found many applications in many areas of Physics, Chemistry and Mathematical Biology. However, there are few reliable methods available which can find all the SPs accurately. Hence, one has to rely on indirect methods such as Random Matrix theory. With a combination of the numerical polynomial homotopy continuation method and a certification method, we obtain all the certified SPs of the most general polynomial RP for each sample chosen from the Gaussian distribution with mean 0 and variance 1. While obtaining many novel results for the finite size case of the RP, we also discuss the implications of our results on mathematics of random systems and string theory landscapes.

Mehta, Dhagash; Sun, Chuang

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

SYSTEMS MODELING OF AMMONIA BORANE BEAD REACTOR FOR OFF-BOARD REGENERABLE HYDROGEN STORAGE IN PEM FUEL CELL APPLICATIONS  

SciTech Connect (OSTI)

Out of the materials available for chemical hydrogen storage in PEM fuel cell applications, ammonia borane (AB, NH3BH3) has a high hydrogen storage capacity (upto 19.6% by weight for the release of three hydrogen molecules). Therefore, AB was chosen in our chemical hydride simulation studies. A model for the AB bead reactor system was developed to study the system performance and determine the energy, mass and volume requirements for off-board regenerable hydrogen storage. The system includes hot and cold augers, ballast tank and reactor, product tank, H2 burner and a radiator. One dimensional models based on conservation of mass, species and energy were used to predict important state variables such as reactant and product concentrations, temperatures of various components, flow rates, along with pressure in the reactor system. Control signals to various components are governed by a control system which is modeled as an independent subsystem. Various subsystem components in the models were coded as C language S-functions and implemented in Matlab/Simulink environment. Preliminary system simulation results for a start-up case and for a transient drive cycle indicate accurate trends in the reactor system dynamics.

Brooks, Kriston P.; Devarakonda, Maruthi N.; Rassat, Scot D.; King, Dale A.; Herling, Darrell R.

2010-06-01T23:59:59.000Z

302

Cost analysis of NOx control alternatives for stationary gas turbines  

SciTech Connect (OSTI)

The use of stationary gas turbines for power generation has been growing rapidly with continuing trends predicted well into the future. Factors that are contributing to this growth include advances in turbine technology, operating and siting flexibility and low capital cost. Restructuring of the electric utility industry will provide new opportunities for on-site generation. In a competitive market, it maybe more cost effective to install small distributed generation units (like gas turbines) within the grid rather than constructing large power plants in remote locations with extensive transmission and distribution systems. For the customer, on-site generation will provide added reliability and leverage over the cost of purchased power One of the key issues that is addressed in virtually every gas turbine application is emissions, particularly NO{sub x} emissions. Decades of research and development have significantly reduced the NO{sub x} levels emitted from gas turbines from uncontrolled levels. Emission control technologies are continuing to evolve with older technologies being gradually phased-out while new technologies are being developed and commercialized. The objective of this study is to determine and compare the cost of NO{sub x} control technologies for three size ranges of stationary gas turbines: 5 MW, 25 MW and 150 MW. The purpose of the comparison is to evaluate the cost effectiveness and impact of each control technology as a function of turbine size. The NO{sub x} control technologies evaluated in this study include: Lean premix combustion, also known as dry low NO{sub x} (DLN) combustion; Catalytic combustion; Water/steam injection; Selective catalytic reduction (SCR)--low temperature, conventional, high temperature; and SCONO{sub x}{trademark}.

Bill Major

1999-11-05T23:59:59.000Z

303

Ceramic Stationary Gas Turbine Development. Technical progress report, April 1, 1993--October 31, 1994  

SciTech Connect (OSTI)

This report summarizes work performed by Solar Technologies Inc. and its subcontractors, during the period April 1, 1993 through October 31, 1994 under Phase II of the DOE Ceramic Stationary Gas Turbine Development program. The objective of the program is to improve the performance of stationary gas turbines in cogeneration through the implementation of selected ceramic components.

NONE

1994-12-01T23:59:59.000Z

304

Stationary free surface viscous flows without surface tension in three dimensions  

E-Print Network [OSTI]

Stationary free surface viscous flows without surface tension in three dimensions Frederic Abergel dimensional channel. In the absence of surface tension, we prove the existence of a unique stationary solution is not elliptic when surface tension is neglected. Hence, analysis such as that made in [4] or [17] fails

Boyer, Edmond

305

Stationary Motion of the Adiabatic Piston Institut de Physique Th'eorique, '  

E-Print Network [OSTI]

Stationary Motion of the Adiabatic Piston Ch. Gruber Institut de Physique Th'eorique, ' Ecole , separated by an adiabatic movable piston whose mass M is much larger than the mass m of the fluid particules. This is the infinite version of the controversial adiabatic piston problem. The stationary non­equilibrium solution

306

Page 1 of 29 Strategic Inventory Placement in Supply Chains: Non-Stationary Demand  

E-Print Network [OSTI]

difficult to forecast. Furthermore, demand is never really stationary as the demand rate evolves over that product demand is uncertain and difficult to forecast, and that the demand process evolves overPage 1 of 29 Strategic Inventory Placement in Supply Chains: Non-Stationary Demand Stephen C

Graves, Stephen C.

307

THE INTEGRATION AND CONTROL OF MULTIFUNCTIONAL STATIONARY PV-BATTERY SYSTEMS IN SMART DISTRIBUTION GRID  

E-Print Network [OSTI]

) in presence of photovoltaic (PV) panel on the view of techno economic optimal sizing taking the considerationTHE INTEGRATION AND CONTROL OF MULTIFUNCTIONAL STATIONARY PV-BATTERY SYSTEMS IN SMART DISTRIBUTION stationary battery energy storage systems (BESS) in the public low-voltage distribution grid in order

Berning, Torsten

308

Modelling spatially-dependent non-stationary extremes with application to hurricane-induced wave heights  

E-Print Network [OSTI]

Modelling spatially-dependent non-stationary extremes with application to hurricane-induced wave frequently that the extremes of a variable of interest are non-stationary, varying systematically in space are used to infer the marginal behaviour of the extremes at individual sites, while making proper

Guillas, Serge

309

Hydrogen Fuel Cell Analysis: Lessons Learned from Stationary Power Generation Final Report  

SciTech Connect (OSTI)

This study considered opportunities for hydrogen in stationary applications in order to make recommendations related to RD&D strategies that incorporate lessons learned and best practices from relevant national and international stationary power efforts, as well as cost and environmental modeling of pathways. The study analyzed the different strategies utilized in power generation systems and identified the different challenges and opportunities for producing and using hydrogen as an energy carrier. Specific objectives included both a synopsis/critical analysis of lessons learned from previous stationary power programs and recommendations for a strategy for hydrogen infrastructure deployment. This strategy incorporates all hydrogen pathways and a combination of distributed power generating stations, and provides an overview of stationary power markets, benefits of hydrogen-based stationary power systems, and competitive and technological challenges. The motivation for this project was to identify the lessons learned from prior stationary power programs, including the most significant obstacles, how these obstacles have been approached, outcomes of the programs, and how this information can be used by the Hydrogen, Fuel Cells & Infrastructure Technologies Program to meet program objectives primarily related to hydrogen pathway technologies (production, storage, and delivery) and implementation of fuel cell technologies for distributed stationary power. In addition, the lessons learned address environmental and safety concerns, including codes and standards, and education of key stakeholders.

Scott E. Grasman; John W. Sheffield; Fatih Dogan; Sunggyu Lee; Umit O. Koylu; Angie Rolufs

2010-04-30T23:59:59.000Z

310

Phase dynamics of nearly stationary patterns in activator-inhibitor systems  

SciTech Connect (OSTI)

The slow dynamics of nearly stationary patterns in a FitzHugh-Nagumo model are studied using a phase dynamics approach. A Cross-Newell phase equation describing slow and weak modulations of periodic stationary solutions is derived. The derivation applies to the bistable, excitable, and Turing unstable regimes. In the bistable case stability thresholds are obtained for the Eckhaus and zigzag instabilities and for the transition to traveling waves. Neutral stability curves demonstrate the destabilization of stationary planar patterns at low wave numbers to zigzag and traveling modes. Numerical solutions of the model system support the theoretical findings. (c) 2000 The American Physical Society.

Hagberg, Aric [Center for Nonlinear Studies and T-7, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Center for Nonlinear Studies and T-7, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Meron, Ehud [The Jacob Blaustein Institute for Desert Research and the Physics Department, Ben-Gurion University, Sede Boker Campus 84990, (Israel)] [The Jacob Blaustein Institute for Desert Research and the Physics Department, Ben-Gurion University, Sede Boker Campus 84990, (Israel); Passot, Thierry [Observatoire de la Cote d'Azur, Boite Postale 4229, 06304 Nice Cedex 4, (France) [Observatoire de la Cote d'Azur, Boite Postale 4229, 06304 Nice Cedex 4, (France); Department of Mathematics, University of Arizona, Tucson, Arizona 85721 (United States)

2000-06-01T23:59:59.000Z

311

PEMFC Power System on EthanolPEMFC Power System on Ethanol Caterpillar Inc.Caterpillar Inc.  

E-Print Network [OSTI]

J. RichardsThomas J. Richards #12;PEM ETHANOL FUEL CELL DOE Hydrogen & Fuel Cells 2003 Annual Merit Review 21 May 2003 #12;PEM ETHANOL FUEL CELL In 2003, a 10-15 kW stationary PEM fuel cell system examines the durability of a PEM based fuel cell system while operating on ethanol - a renewable fuel

312

Ceramic stationary gas turbine development program -- Fifth annual summary  

SciTech Connect (OSTI)

A program is being performed under the sponsorship of the US Department of Energy, Office of Industrial Technologies, to improve the performance of stationary gas turbines in cogeneration through the selective replacement of metallic hot section components with ceramic parts. The program focuses on design, fabrication, and testing of ceramic components, generating a materials properties data base, and applying life prediction and nondestructive evaluation (NDE). The development program is being performed by a team led by Solar Turbines Incorporated, and which includes suppliers of ceramic components, US research laboratories, and an industrial cogeneration end user. The Solar Centaur 50S engine was selected for the development program. The program goals included an increase in the turbine rotor inlet temperature (TRIT) from 1,010 C (1,850 F) to 1,121 C (2,050 F), accompanied by increases in thermal efficiency and output power. The performance improvements are attributable to the increase in TRIT and the reduction in cooling air requirements for the ceramic parts. The ceramic liners are also expected to lower the emissions of NOx and CO. Under the program uncooled ceramic blades and nozzles have been inserted for currently cooled metal components in the first stage of the gas producer turbine. The louvre-cooled metal combustor liners have been replaced with uncooled continuous-fiber reinforced ceramic composite (CFCC) liners. Modifications have been made to the engine hot section to accommodate the ceramic parts. To date, all first generation designs have been completed. Ceramic components have been fabricated, and are being tested in rigs and in the Centaur 50S engine. Field testing at an industrial co-generation site was started in May, 1997. This paper will provide an update of the development work and details of engine testing of ceramic components under the program.

Price, J.R.; Jimenez, O.; Faulder, L.; Edwards, B.; Parthasarathy, V.

1999-10-01T23:59:59.000Z

313

CGH Data Modeling and Smoothing in Stationary Wavelet Packet Transform Domain.  

E-Print Network [OSTI]

CGH Data Modeling and Smoothing in Stationary Wavelet Packet Transform Domain. Heng Huang1 , Nha, Texas, USA Email: Heng Huang- heng@uta.edu; Nha Nguyen - nhn3175@exchange.uta.edu; Soontorn Oraintara

Huang, Heng

314

Mobile and Stationary Computer Vision based Traffic Surveillance Techniques for Advanced ITS Applications  

E-Print Network [OSTI]

between the loop data and mobile data. Bibliography [1] M.nd Workwhop on Perception of Mobile Agents, CVPR99, pp. 82-OF CALIFORNIA RIVERSIDE Mobile and Stationary Computer

Cao, Meng

2009-01-01T23:59:59.000Z

315

The Spectral Density Estimation of Stationary Time Series with Missing Data  

E-Print Network [OSTI]

reported in literature (see, e.g. Green et al., 2002, Kaneoke and Vitek, 1996, Fortin and Mackey, 1999, and Laguna et al., 1998). Here we consider estimating the spectral density of stationary time series

Schellekens, Michel P.

316

E-Print Network 3.0 - advanced stationary natural Sample Search...  

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

with side constrains: Natural extension to simulation: Use... state: Stationary case 2D-Optimization: Find the heights where two balls hover J(y1, y2) |lift1 Source: Hron,...

317

Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis  

Fuel Cell Technologies Publication and Product Library (EERE)

This report details technical and cost gap analyses of molten carbonate fuel cell and phosphoric acid fuel cell stationary fuel cell power plants and identifies pathways for reducing costs.

318

File:5 CCR 1001-5 Colorado Stationary Source Permitting and Air...  

Open Energy Info (EERE)

CCR 1001-5 Colorado Stationary Source Permitting and Air Pollution Control Emission Notice Requirements.pdf Jump to: navigation, search File File history File usage Metadata File:5...

319

Potential Energy Landscape of the Two-Dimensional XY Model: Higher-Index Stationary Points  

E-Print Network [OSTI]

The application of numerical techniques to the study of energy landscapes of large systems relies on sufficient sampling of the stationary points. Since the number of stationary points is believed to grow exponentially with system size, we can only sample a small fraction. We investigate the interplay between this restricted sample size and the physical features of the potential energy landscape for the two-dimensional $XY$ model in the absence of disorder with up to $N=100$ spins. Using an eigenvector-following technique, we numerically compute stationary points with a given Hessian index $I$ for all possible values of $I$. We investigate the number of stationary points, their energy and index distributions, and other related quantities, with particular focus on the scaling with $N$. The results are used to test a number of conjectures and approximate analytic results for the general properties of energy landscapes.

Dhagash Mehta; Ciaran Hughes; Michael Kastner; David J Wales

2014-12-10T23:59:59.000Z

320

Stationary Fuel Cell System Composite Data Products: Data Through Quarter 4 of 2012  

SciTech Connect (OSTI)

This presentation from the U.S. Department of Energy's National Renewable Energy Laboratory includes stationary fuel cell system composite data products for data through the fourth quarter of 2012.

Ainscough, C.; Kurtz, J.; Saur, G.

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis  

SciTech Connect (OSTI)

This report describes the technical and cost gap analysis performed to identify pathways for reducing the costs of molten carbonate fuel cell (MCFC) and phosphoric acid fuel cell (PAFC) stationary fuel cell power plants.

Remick, R.; Wheeler, D.

2010-09-01T23:59:59.000Z

322

110 kW Stationary Combined Heat and Power Systems Status and  

E-Print Network [OSTI]

the status of 1­10 kW CHP stationary fuel cell systems and to comment on the achievability of cost Published for the U.S. Department of Energy Hydrogen and Fuel Cells Program NREL/BK-6A10-48265 November 2010 technologies that are being developed to address the market needs of 1­10 kW CHP stationary systems: low

323

Response of an unbalanced rotating machine to a stationary normal random excitation  

E-Print Network [OSTI]

Process, x(t) The Mean Square Response for a Stationary Normal Random process, x(t) 17 18 The Root Mean Square Foundation Force. . . . . . . . . . . . . . . . 19 Derivation of the Critical Variance of Eccentricity. . 20 TABLE OF CONTENTS (continued... probability density function autocorrelation of a stationary random process estimator of correlation a constant spectral density spectral density estimator of variance NDNENCLATURE (continued) Symbol Description time Wp x(t) xp (t) Y (w) y (t...

Boyce, Lola

1975-01-01T23:59:59.000Z

324

Quasi-stationary circuit relationships from electromagnetic theory with special emphasis on equivalence  

E-Print Network [OSTI]

QUASI-STATIONARY CIRCUIT RELATIONSHIPS PROM ELECTROMAGNETIC THEORY WITH SPECIAL EMPHASIS ON EQUIVALENCE A Dissertation By Woodrow W. Gandy ontent by Chairman of Committee QUASI-STATIONARY CIRCUIT RELATIONSHIPS FROM ELECTROMAGNETIC THEORY... WITH SPECIAL EMPHASIS ON EQUIVALENCE A Dissertation Submitted to the Faculty of the Agricultural and Mechanical College of Texas in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy Major Subject: Electrical Engineering...

Gandy, Woodrow Wheeler

1952-01-01T23:59:59.000Z

325

Proteomic Analysis of Stationary Phase in the Marine Bacterium 'Candidatus Pelagibacter ubique'  

SciTech Connect (OSTI)

Candidatus Pelagibacter ubique, an abundant marine alphaproteobacterium, subsists in nature at low ambient nutrient concentrations and may often be exposed to nutrient limitation, but its genome revealed no evidence of global regulatory adaptations to stationary phase. We used high-resolution capillary liquid chromatography (LC) coupled online to an LTQ mass spectrometer to build an Accurate Mass and Time (AMT) tag library, and employed the AMT tag approach to quantitatively examine proteome differences between exponentially growing and stationary phase Cand. P. ubique cells cultivated in a seawater medium. The AMT tag library represented 72% of the predicted protein coding genes. Stationary phase protein abundance increased for OsmC, which mitigates oxidative damage, and for molecular chaperones, enzymes involved in methionine and cysteine biosynthesis, proteins involved in rho-dependent transcription termination, and the signal transduction enzymes CheY-FisH and ChvG. Our findings indicate that Cand. P. ubique responds adaptively to stationary phase by increasing the abundance of a suite of proteins that contribute to homeostasis, but does not undergo major proteome remodeling. We speculate that this limited response may enable Cand. P. ubique to cope with ambient conditions in which nutrients are often insufficient for short periods, and the ability to resume growth overrides the capacity for long term survival afforded by more comprehensive global stationary phase responses.

Sowell, Sarah M.; Norbeck, Angela D.; Lipton, Mary S.; Nicora, Carrie D.; Callister, Stephen J.; Smith, Richard D.; Barofsky, Douglas F.; Giovannoni, Stephen J.

2008-05-01T23:59:59.000Z

326

Sandia National Laboratories: PEM  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-Salt StorageNoLong Range

327

Bridging the Gap Between Transportation and Stationary Power: Hydrogen Energy Stations and their Implications for the Transportation Sector  

E-Print Network [OSTI]

Economic Analysis of Hydrogen Energy Station Concepts,E 2 Four Potential Types of Hydrogen Energy Stations VehicleOperational Toronto Hydrogen Energy Station Stationary PEMFC

Weinert, Jonathan X.; Lipman, Timothy; Unnasch, Stephen

2005-01-01T23:59:59.000Z

328

Non-Stationary Random Process for Large-Scale Failure and Recovery of Power Distributions  

E-Print Network [OSTI]

A key objective of the smart grid is to improve reliability of utility services to end users. This requires strengthening resilience of distribution networks that lie at the edge of the grid. However, distribution networks are exposed to external disturbances such as hurricanes and snow storms where electricity service to customers is disrupted repeatedly. External disturbances cause large-scale power failures that are neither well-understood, nor formulated rigorously, nor studied systematically. This work studies resilience of power distribution networks to large-scale disturbances in three aspects. First, a non-stationary random process is derived to characterize an entire life cycle of large-scale failure and recovery. Second, resilience is defined based on the non-stationary random process. Close form analytical expressions are derived under specific large-scale failure scenarios. Third, the non-stationary model and the resilience metric are applied to a real life example of large-scale disruptions due t...

Wei, Yun; Galvan, Floyd; Couvillon, Stephen; Orellana, George; Momoh, James

2012-01-01T23:59:59.000Z

329

Adaptive Threshold Spike Detection using Stationary Wavelet Transform for Neural Recording Implants  

E-Print Network [OSTI]

to optimize power consumption. The system was designed in 130nm CMOS and shown to occupy 0.082 mm2. Such a system must operate with very low power and occupy minimal area in order to facilitate implantationAdaptive Threshold Spike Detection using Stationary Wavelet Transform for Neural Recording Implants

Mason, Andrew

330

STATIONARY HIGH-PERFORMANCE DISCHARGES IN THE DII-D TOKAMAK  

SciTech Connect (OSTI)

A271 STATIONARY HIGH-PERFORMANCE DISCHARGES IN THE DII-D TOKAMAK. Discharges which can satisfy the high gain goals of burning plasma experiments have been demonstrated in the DIII-D tokamak under stationary conditions at relatively low plasma current (q{sub 95} > 4). A figure of merit for fusion gain ({beta}{sub N}H{sub 89}/q{sub 95}{sup 2}) has been maintained at values corresponding to ! = 10 operation in a burning plasma for > 6 s or 36{tau}{sub E} and 2{tau}{sub R}. The key element is the relaxation of the current profile to a stationary state with q{sub min} > 1. In the absence of sawteeth and fishbones, stable operation has been achieved up to the estimated no-wall {beta} limit. Feedback control of the energy content and particle inventory allow reproducible, stationary operation. The particle inventory is controlled by gas fueling and active pumping; the wall plays only a small role in the particle balance. The reduced current lessens significantly the potential for structural damage in the event of a major disruption. In addition, the pulse length capability is greatly increased, which is essential for a technology testing phase of a burning plasma experiment where fluence (duty cycle) is important.

LUCE,TC; WADE,MR; FERRON,JR; HYATT,AW; KELLMAN,AG; KINSEY,JE; LAHAYE,RJ; LASNIER,CJ; MURAKAMI,M; POLITZER,PA; SCOVILLE,JT

2002-11-01T23:59:59.000Z

331

Stationary free surface viscous ows without surface tension in three dimensions  

E-Print Network [OSTI]

Stationary free surface viscous ows without surface tension in three dimensions Frederic Abergel owing down a three dimensional channel. In the absence of surface tension, we prove the existence is not elliptic when surface tension is neglected. Hence, analysis such as that made in [4] or [17] fails

Paris-Sud XI, Université de

332

Control of Parallel-Connected Bidirectional AC-DC Converters in Stationary Frame for Microgrid  

E-Print Network [OSTI]

Control of Parallel-Connected Bidirectional AC-DC Converters in Stationary Frame for Microgrid-- With the penetration of renewable energy in modern power system, microgrid has become a popular application worldwide. In this paper, parallel-connected bidirectional converters for AC and DC hybrid microgrid application

Teodorescu, Remus

333

Stationary IPA Estimates for Non-Smooth G/G/1/ Functionals via Palm Inversion and  

E-Print Network [OSTI]

Stationary IPA Estimates for Non-Smooth G/G/1/ Functionals via Palm Inversion and Level, the derivative of J with respect to . To this end, we use Infinitesimal Perturbation Analysis (IPA), a method on IPA. Alternative methods have been used to estimate derivatives, namely Smooth Perturbation Analysis

Paris-Sud XI, Université de

334

Overview of Options to Integrate Stationary Power Generation from Fuel Cells with  

E-Print Network [OSTI]

;3 Alternate Fuel Infrastructure Lessons Learned Project ·Project with NREL ·Workshop held in April 2008 Municipalities and Local government agencies Fire and Rescue facilities Policy stations Data centers Universities1 Overview of Options to Integrate Stationary Power Generation from Fuel Cells with Hydrogen Demand

335

Economic Implications of Net Metering for Stationary and Motor Vehicle Fuel Cell Systems in California  

E-Print Network [OSTI]

PWP-092 Economic Implications of Net Metering for Stationary and Motor Vehicle Fuel Cell Systems emissions, and petroleum use from motor vehicles, fuel cell vehicles (FCVs) could also act as distributed Fuel Cell Systems in California January 31, 2002 Dr. Timothy E. Lipman Ms. Jennifer L. Edwards Prof

Kammen, Daniel M.

336

Investigating the Linear and Nonlinear Stationary Wave Response to Anomalous North American Snow Cover  

E-Print Network [OSTI]

on monthly-to-intraseasonal time scales, with the potential to modify local and remote atmospheric diagnose a deep, snow-induced, tropospheric cooling over NA and hypothesize that this may represent that diabatic cooling is the primary driver of the stationary wave response. In particular, the total nonlinear

337

Quasi-stationary states and a classification of the range of pair interactions  

SciTech Connect (OSTI)

Systems of long-range interacting particles present typically 'quasi-stationary' states (QSS). Investigating their lifetime for a generic pair interaction V(r{yields}{infinity}){approx}1/r{sup {gamma}} we give a classification of the range of the interactions according to the dynamical properties of the system.

Gabrielli, A. [Istituto dei Sistemi Complessi (ISC), CNR, Via dei Taurini 19, Rome (Italy); Joyce, M. [Laboratoire de Physique Nucleaire et Hautes Energies, Universite Pierre et Marie Curie (France); Marcos, B. [Laboratoire J.-A. Dieudonne, Universite de Nice-Sophia Antipolis (France)

2011-03-24T23:59:59.000Z

338

PROOF COPY 016212PHP Comment on ``Stationary equilibria of self-gravitating quasineutral dusty  

E-Print Network [OSTI]

PROOF COPY 016212PHP PROOF COPY 016212PHP Comment on ``Stationary equilibria of self/2002/9(12)/1/3/$19.00 © 2002 American Institute of Physics PROOF COPY 016212PHP #12;PROOF COPY 016212PHP PROOF COPY 016212PHP Now comes the crucial step. ``In order to obtain a closed form equation

Roy, Subrata

339

Thermocapillary and Magnetohydrodynamic Effects in Modelling the Thermodynamics of Stationary Welding Processes  

E-Print Network [OSTI]

Welding Processes Michael HUGHES, Gareth A. TAYLOR and Koulis PERICLEOUS Centre for Numerical Modelliqng transport and solidification in a stationary axisymmetric weld pool. The PHOENICS implementations, the integration of the effects within the fluid dynamics of an axisymmetric weld pool is compared against

Taylor, Gary

340

Some Strange Numerical Solutions of the Non-stationary Navier-Stokes Equations in Pipes  

E-Print Network [OSTI]

Some Strange Numerical Solutions of the Non-stationary Navier-Stokes Equations in Pipes Bernd Newtonian uids in three- dimensional pipes with known steady laminar realizations is investigated-called pipe ow of incompressible Newtonian uids is well known as an old-established ob- ject of preference

Magdeburg, Universität

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Dynamic Power Management for non-stationary service requests Eui-Young Chung  

E-Print Network [OSTI]

. Introduction Design methodologies for energy-efficient system-level design are receiving increasingly larger phones, laptop computers, etc.) and of the concerns about the environmental impact of elec- tronic-line analysis of usage traces, hence they are not suitable to non-stationary request streams whose statistical

De Micheli, Giovanni

342

Non-Stationary Spectral Estimation for Wind Turbine Induction Generator Faults Detection  

E-Print Network [OSTI]

- or indirect-drive, fixed- or variable-speed turbine generators, advanced signal processing tools are requiredNon-Stationary Spectral Estimation for Wind Turbine Induction Generator Faults Detection El Houssin- rine current turbine farms implies to minimize and predict maintenance operations. In direct

Paris-Sud XI, Université de

343

Three-dimensional stationary cyclic symmetric Einstein-Maxwell solutions; black holes  

SciTech Connect (OSTI)

From a general metric for stationary cyclic symmetric gravitational fields coupled to Maxwell electromagnetic fields within the (2 + 1)-dimensional gravity the uniqueness of wide families of exact solutions is established. Among them, all uniform electromagnetic solutions possessing electromagnetic fields with vanishing covariant derivatives, all fields having constant electromagnetic invariants F{sub {mu}}{sub {nu}}F{sup {mu}}{sup {nu}} and T{sub {mu}}{sub {nu}}T{sup {mu}}{sup {nu}}, the whole classes of hybrid electromagnetic solutions, and also wide classes of stationary solutions are derived for a third-order nonlinear key equation. Certain of these families can be thought of as black hole solutions. For the most general set of Einstein-Maxwell equations, reducible to three nonlinear equations for the three unknown functions, two new classes of solutions - having anti-de Sitter spinning metric limit - are derived. The relationship of various families with those reported by different authors' solutions has been established. Among the classes of solutions with cosmological constant a relevant place is occupied by the electrostatic and magnetostatic Peldan solutions, the stationary uniform and spinning Clement classes, the constant electromagnetic invariant branches with the particular Kamata-Koikawa solution, the hybrid cyclic symmetric stationary black hole fields, and the non-less important solutions generated via SL(2,R)-transformations where the Clement spinning charged solution, the Martinez-Teitelboim-Zanelli black hole solution, and Dias-Lemos metric merit mention.

Garcia, Alberto A. [Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN, Apdo. Postal 14-740, 07000 Mexico, DF (Mexico); Department of Physics, University of California, Davis, CA 95616 (United States)], E-mail: aagarcia@fis.cinvestav.mx

2009-09-15T23:59:59.000Z

344

Alpha channeling in rotating plasma with stationary waves Abraham J. Fetterman and Nathaniel J. Fisch  

E-Print Network [OSTI]

particle energy. Alpha channeling uses radiofrequency waves to remove alpha particles collisionlessly at low energy. It is shown that stationary magnetic fields with high n can be used for this purpose, and simulations indicate that a large fraction of the alpha energy can be converted to rotation energy. © 2010

345

Multivariate Non-stationary Stochastic Streamflow Models for Two Urban , R. Vogel2  

E-Print Network [OSTI]

as changes in the water use cycle. Urbanization leads to construction of water distribution systems and storm1 Multivariate Non-stationary Stochastic Streamflow Models for Two Urban Watersheds M. Ng1 , R: urbanization and changes in climate and water use are examples of such influences. The evolution

Vogel, Richard M.

346

Coloquio Inter-Institucional "Modelos Estocasticos e Aplicacoes" When stationary limits of spatially ergodic  

E-Print Network [OSTI]

Coloquio Inter- Institucional "Modelos Estocasticos e Aplicacoes" When stationary limits "Modelos Estocasticos e Aplicacoes" · General case Open problem · Particle systems Spin flip systems and Garcia (2006) 2 Rio de Janeiro, 29/06/2007 #12;Coloquio Inter- Institucional "Modelos Estocasticos e

Liu, I-Shih

347

Modeling and Optimization of Commercial Buildings and Stationary Fuel Cell Systems (Presentation)  

SciTech Connect (OSTI)

This presentation describes the Distributed Generation Building Energy Assessment Tool (DG-BEAT) developed by the National Renewable Energy Laboratory and the University of California Irvine. DG-BEAT is designed to allow stakeholders to assess the economics of installing stationary fuel cell systems in a variety of building types in the United States.

Ainscough, C.; McLarty, D.; Sullivan, R.; Brouwer, J.

2013-10-01T23:59:59.000Z

348

Room-temperature stationary sodium-ion batteries for large-scale electric energy storage  

E-Print Network [OSTI]

energy and utility applications, such as pump hydro, compressed air, y-wheel and electrochemicalRoom-temperature stationary sodium-ion batteries for large-scale electric energy storage Huilin Pan attention particularly in large- scale electric energy storage applications for renewable energy and smart

Wang, Wei Hua

349

Blind Identification of MIMO FIR Systems Driven by Quasi-Stationary Sources Using Second Order  

E-Print Network [OSTI]

1 Blind Identification of MIMO FIR Systems Driven by Quasi-Stationary Sources Using Second Order This paper discusses a frequency domain method for blind identification of MIMO convolutive channels driven are presented to demonstrate the performance of the new algorithm1 . I. Introduction Blind identification

Reilly, James P.

350

Abstract--The growing popularity and success of fuel cells in aerospace, stationary power, and transportation  

E-Print Network [OSTI]

to low cost technologies and chip-scale dimen- sions. Conventional fuel cell models, however, fail1 Abstract-- The growing popularity and success of fuel cells in aerospace, stationary power runtime, and decreasing size. Di- rect-methanol fuel cell batteries have now been built and conformed

Rincon-Mora, Gabriel A.

351

Stationary formulas for computing the response in eddy-current NDE  

SciTech Connect (OSTI)

Stationary or variational formulations have been proven to be useful in a number of electromagnetic problems. This paper presents such a formulation for the response in the eddy-current NDE problem. It thus provides an approach to estimating the response due to arbitrary defects in cases where a reasonable first guess for the current distribution responsible for the scattered fields can be obtained.

Hower, G.L.

1987-12-01T23:59:59.000Z

352

Dynamical and Stationary Properties of On-line Learning from Finite Training Sets  

E-Print Network [OSTI]

are found to agree with simulations. The physical origin of the critical learning rate is presentedDynamical and Stationary Properties of On-line Learning from Finite Training Sets Peixun Luo #3 of on-line learning from #12;nite training sets are analysed using the cavity method. For large input

Wong, Michael K Y

353

A Comparison of Non-stationary, Type-2 and Dual Surface Fuzzy Control  

E-Print Network [OSTI]

,uxa,jmg]@cs.nott.ac.uk Abstract--Type-1 fuzzy logic has frequently been used in control systems. However this method is sometimes and fuzzy logic to automate system controllers. The underpinning technique of fuzzy logic was originallyA Comparison of Non-stationary, Type-2 and Dual Surface Fuzzy Control Naisan Benatar, Uwe Aickelin

Aickelin, Uwe

354

Massive spin-2 and spin-1/2 no hair theorems for stationary axisymmetric black holes  

E-Print Network [OSTI]

We present a proof of the no hair theorems corresponding to free massive non-perturbative Pauli-Fierz spin-2 and perturbative massive spin-1/2 fields for stationary axisymmetric de Sitter black hole spacetimes of dimension four with two commuting Killing vector fields. The applicability of these results for asymptotically flat and anti-de Sitter spacetimes are also discussed.

Sourav Bhattacharya; Amitabha Lahiri

2012-10-09T23:59:59.000Z

355

Large deviations for Gaussian stationary processes and semi-classical analysis  

E-Print Network [OSTI]

, the maximum eigenvalue of Tn(f) converges to esssupf while the minimum eigen- value of Tn(f) convergesLarge deviations for Gaussian stationary processes and semi-classical analysis Bernard Bercu, Jean matrices, based on semi-classical analysis, is also provided. Key words: Large deviations, Gaussian

Bruneau, Vincent

356

Waste-Lithium-Liquid (WLL) Flow Battery for Stationary Energy Storage Applications Youngsik Kim* and Nina MahootcheianAsl  

E-Print Network [OSTI]

Waste-Lithium-Liquid (WLL) Flow Battery for Stationary Energy Storage Applications Youngsik Kim in a Waste-Lithium-Liquid (WLL) flow battery that can be used in a stationary energy storage application. Li* and Nina MahootcheianAsl Richard Lugar Center for Renewable Energy, Department of Mechanical Engineering

Zhou, Yaoqi

357

The use of the stationary phase method as a mathematical tool to determine the path of optical beams  

E-Print Network [OSTI]

We use the stationary phase method to determine the path of optical beams which propagate through a dielectric block. In the presence of partial internal reflection, we recover the geometrical result obtained by using the Snell law. For total internal reflection, the stationary phase method overreaches the Snell law predicting the Goos-Haenchen shift.

Carvalho, Silvânia A

2015-01-01T23:59:59.000Z

358

"Dedicated To The Continued Education, Training and Demonstration of PEM Fuel Cell Powered Lift Trucks In Real-World Applications."  

SciTech Connect (OSTI)

The project objective was to further assist in the commercialization of fuel cell and H2 technology by building further upon the successful fuel cell lift truck deployments that were executed by LiftOne in 2007, with longer deployments of this technology in real-world applications. We involved facilities management, operators, maintenance personnel, safety groups, and Authorities Having Jurisdiction. LiftOne strived to educate a broad group from many areas of industry and the community as to the benefits of this technology. Included were First Responders from the local areas. We conducted month long deployments with end-users to validate the value proposition and the market requirements for fuel cell powered lift trucks. Management, lift truck operators, Authorities Having Jurisdiction and the general public experienced 'hands on' fuel cell experience in the material handling applications. We partnered with Hydrogenics in the execution of the deployment segment of the program. Air Products supplied the compressed H2 gas and the mobile fueler. Data from the Fuel Cell Power Packs and the mobile fueler was sent to the DOE and NREL as required. Also, LiftOne conducted the H2 Education Seminars on a rotating basis at their locations for lift trucks users and for other selected segments of the community over the project's 36 month duration. Executive Summary The technology employed during the deployments program was not new, as the equipment had been used in several previous demos and early adoptions within the material handling industry. This was the case with the new HyPx Series PEM - Fuel Cell Power Packs used, which had been demo'd before during the 2007 Greater Columbia Fuel Cell Challenge. The Air Products HF-150 Fueler was used outdoors during the deployments and had similarly been used for many previous demo programs. The methods used centered on providing this technology as the power for electric sit-down lift trucks at high profile companies operating large fleets. As a long-standing lift truck dealership, LiftOne was able to introduce the fuel cells to such companies in the demanding applications. Accomplishments vs Objectives: We were successful in respect to the stated objectives. The Education Segment's H2 Education Sessions were able to introduce fuel cell technology to many companies and reached the intended broad audience. Also, demos of the lift truck at the sessions as well as the conferences; expos and area events provided great additional exposure. The Deployments were successful in allowing the 6 participating companies to test the 2 fuel cell powered lift trucks in their demanding applications. One of the 6 sites (BMW) eventually adopted over 80 fuel cells from Plug Power. LiftOne was one of the 3 fuel cell demonstrators at BMW for this trial and played a major role in helping to prove the viability and efficiency of this alternative form of energy for BMW. The other 5 companies that participated in the project's deployments were encouraged by the trials and while not converting over to fuel cell power at this time, expressed the desire to revisit acquisition scenarios in the near future as the cost of fuel cells and infrastructure continue to improve. The Education sessions began in March of 2009 at the 7 LiftOne Branches and continued throughout the duration of the project. Attendees came from a large base of lift truck users in North Carolina, South Carolina and Virginia. The sessions were free and invitations were sent out to potential users and companies with intrigue. In addition to the Education content at the sessions (which was offered in a 'H2 101' format), LiftOne was able to demonstrate a working fuel cell powered lift truck, which proved to be a big draw with the 'hands on' experience. LiftOne also demo'd the fuel cell lift trucks at many conferences, expos, professional association meetings, trade shows and 'Green' events in major cities region including Charlotte, Greenville, and Columbia. Such events allowed for H2 Education Material to be presented, and recruit attendees for future sessi

Dever, Thomas J.

2011-11-29T23:59:59.000Z

359

Downstream asymptotics in exterior domains: from stationary wakes to time periodic flows  

E-Print Network [OSTI]

We consider the time-dependent Navier-Stokes equations in a half-space with boundary data on the line $(x,y)=(x_0,y)$ assumed to be time-periodic (or stationary) with a fixed asymptotic velocity ${\\bf u}_{\\infty}=(1,0)$ at infinity. We show that there exist (locally) unique solutions for all data satisfying a compatibility condition in a certain class of fuctions. Furthermore, we prove that asymptotically the vorticity decompose itself in a dominant stationary part on the parabolic scale $y\\sim\\sqrt{x}$ and corrections of order $x^{-{3/2}+\\epsilon}$, while the velocity field decompose itself in a dominant stationary part in form of an explicit multiscale expansion on the scales $y\\sim\\sqrt{x}$ and $y\\sim x$ and corrections decaying at least like $x^{-{9/8}+\\epsilon}$. The asymptotic fields are made of linear combinations of universal functions with coefficients depending mildly on the boundary data. The asymptotic expansion for the component parallel to ${\\bf u}_{\\infty}$ contains `non-trivial' terms in the parabolic scale with amplitude $\\ln(x)x^{-1}$ and $x^{-1}$. To first order, our results also imply that time-periodic wakes behave like stationary ones as $x\\to\\infty$. The class of functions used is `natural' in the sense that `Physically Reasonable' (in the sense of Finn & Smith) stationary solutions of the N.-S. equations around an obstacle are covered if the half-space is choosen sufficiently far downstream. The coefficients appearing in the asymptotics may then be linearly related to the net force acting on the obstacle. To our knowledge, it is the first time that estimates uncovering the $\\ln(x)x^{-1}$ correction are proved in this setting.

G. van Baalen

2004-11-04T23:59:59.000Z

360

DOE Hydrogen, Fuel Cells, and Infrastructure Technologies  

E-Print Network [OSTI]

: Economic Analysis of Stationary PEM Fuel Cell Systems · Harry Stone, Economist and Principal Investigator. #12;8 Skill Set ­ Models (Battelle) Battelle Team: Economic Analysis of Stationary PEM Fuel Cell Systems Economic analysis of stationary fuel cells and their associated markets to understand the cost

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

System Break-Out Session  

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

battery and Gensets for stationary application - Significant price advantage over PEM fuel cells * Refer to CellEra and Tokuyama presentations for more details Application...

362

STATEMENT OF CONSIDERATIONS ADVANCE CLASS WAIVER OF PATENT. RIGHTS...  

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

but not limited to. the development of stationary polymer electrolyte membrane (PEM) fuel cell power systems for buildings, development of a back-up fuel cell systems,...

363

STATEMENT OF CONSIDERATIONS ADVANCE CLASS WAIVER OF PATENT. RIGHTS...  

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

but not limited to, the development of stationary polymer electrolyte membrane (PEM) fuel cell power systems for buildings, development of a back-up fuel cell systems,...

364

System for monitoring the growth of crystalline films on stationary substrates  

DOE Patents [OSTI]

A system for monitoring the growth of crystalline films on stationary or rotating substrates includes a combination of some or all of the elements including a photodiode sensor for detecting the intensity of incoming light and converting it to a measurable current, a lens for focusing the RHEED pattern emanating from the phosphor screen onto the photodiode, an interference filter for filtering out light other than that which emanates from the phosphor screen, a current amplifier for amplifying and convening the current produced by the photodiode into a voltage, a computer for receiving the amplified photodiode current for RHEED data analysis, and a graphite impregnated triax cable for improving the signal to noise ratio obtained while sampling a stationary or rotating substrate. A rotating stage for supporting the substrate with diametrically positioned electron beam apertures and an optically encoded shaft can also be used to accommodate rotation of the substrate during measurement.

Sheldon, Peter (Lakewood, CO)

1996-01-01T23:59:59.000Z

365

System for monitoring the growth of crystalline films on stationary substrates  

DOE Patents [OSTI]

A system for monitoring the growth of crystalline films on stationary or rotating substrates includes a combination of some or all of the elements including a photodiode sensor for detecting the intensity of incoming light and converting it to a measurable current, a lens for focusing the RHEED pattern emanating from the phosphor screen onto the photodiode, an interference filter for filtering out light other than that which emanates from the phosphor screen, a current amplifier for amplifying and converting the current produced by the photodiode into a voltage, a computer for receiving the amplified photodiode current for RHEED data analysis, and a graphite impregnated triax cable for improving the signal to noise ratio obtained while sampling a stationary or rotating substrate. A rotating stage for supporting the substrate with diametrically positioned electron beam apertures and an optically encoded shaft can also be used to accommodate rotation of the substrate during measurement.

Sheldon, Peter (Lakewood, CO)

1995-01-01T23:59:59.000Z

366

System for monitoring the growth of crystalline films on stationary substrates  

DOE Patents [OSTI]

A system for monitoring the growth of crystalline films on stationary or rotating substrates includes a combination of some or all of the elements including a photodiode sensor for detecting the intensity of incoming light and converting it to a measurable current, a lens for focusing the RHEED pattern emanating from the phosphor screen onto the photodiode, an interference filter for filtering out light other than that which emanates from the phosphor screen, a current amplifier for amplifying and converting the current produced by the photodiode into a voltage, a computer for receiving the amplified photodiode current for RHEED data analysis, and a graphite impregnated triaxial cable for improving the signal-to-noise ratio obtained while sampling a stationary or rotating substrate. A rotating stage for supporting the substrate with diametrically positioned electron beam apertures and an optically encoded shaft can also be used to accommodate rotation of the substrate during measurement. 16 figs.

Sheldon, P.

1995-10-10T23:59:59.000Z

367

System for monitoring the growth of crystalline films on stationary substrates  

DOE Patents [OSTI]

A system for monitoring the growth of crystalline films on stationary or rotating substrates includes a combination of some or all of the elements including a photodiode sensor for detecting the intensity of incoming light and converting it to a measurable current, a lens for focusing the RHEED pattern emanating from the phosphor screen onto the photodiode, an interference filter for filtering out light other than that which emanates from the phosphor screen, a current amplifier for amplifying and convening the current produced by the photodiode into a voltage, a computer for receiving the amplified photodiode current for RHEED data analysis, and a graphite impregnated triaxial cable for improving the signal to noise ratio obtained while sampling a stationary or rotating substrate. A rotating stage for supporting the substrate with diametrically positioned electron beam apertures and an optically encoded shaft can also be used to accommodate rotation of the substrate during measurement. 16 figs.

Sheldon, P.

1996-12-31T23:59:59.000Z

368

Thermodynamics analogue for self-trapped spinning-stationary Madelung fluid  

E-Print Network [OSTI]

We discuss two-dimensional Madelung fluid dynamics whose irrotational case reduces into the Schr\\"odinger equation for a free single particle. We show that the self-trapped spinning-stationary Madelung fluid reported in the previous paper can be analogically identified as an equilibrium thermodynamics system. This is done by making correspondence between Shannon entropy over Madelung density and internal energy to be defined in the main text, respectively with thermal-entropy and thermal-internal energy of equilibrium thermodynamics system. This leads us to identify a Madelung fluid analog of thermal-temperature at the vanishing value of which the stationary Madelung fluid will be no more spinning and is equal to the quantum mechanical ground state of a particle trapped inside a cylindrical tube external potential.

Agung Budiyono

2010-06-25T23:59:59.000Z

369

Regulation of Emissions from Stationary Diesel Engines (released in AEO2007)  

Reports and Publications (EIA)

On July 11, 2006, the Environmental Protection Agency (EPA) issued regulations covering emissions from stationary diesel engines New Source Performance Standards that limit emissions of NOx, particulate matter, SO2, carbon monoxide, and hydrocarbons to the same levels required for nonroad diesel engines. The regulation affects new, modified, and reconstructed diesel engines. Beginning with model year 2007, engine manufacturers must specify that new engines less than 3,000 horsepower meet the same emissions standard as nonroad diesel engines. For engines greater than 3,000 horsepower, the standard will be fully effective in 2011. Stationary diesel engine fuel will also be subject to the same standard as nonroad diesel engine fuel, which reduces the sulfur content of the fuel to 500 parts per million by mid-2007 and 15 parts per million by mid-2010.

2007-01-01T23:59:59.000Z

370

Young Stellar Clusters with a Schuster Mass Distribution - I: Stationary Winds  

E-Print Network [OSTI]

Hydrodynamic models for spherically-symmetric winds driven by young stellar clusters with a generalized Schuster stellar density profile are explored. For this we use both semi-analytic models and 1D numerical simulations. We determine the properties of quasi-adiabatic and radiative stationary winds and define the radius at which the flow turns from subsonic into supersonic for all stellar density distributions. Strongly radiative winds diminish significantly their terminal speed and thus their mechanical luminosity is strongly reduced. This also reduces their potential negative feedback into their host galaxy ISM. The critical luminosity above which radiative cooling becomes dominant within the clusters, leading to thermal instabilities which make the winds non-stationary, is determined, and its dependence on the star cluster density profile, core radius and half mass radius is discussed.

Palous, Jan; Martinez-Gonzalez, Sergio; Hueyotl-Zahuantitla, Filiberto; Silich, Sergiy; Tenorio-Tagle, Guillermo

2013-01-01T23:59:59.000Z

371

Is the electron stationary in the ground state of the Dirac hydrogen atom in Bohm's Theory?  

E-Print Network [OSTI]

We show that, in the relativistic Bohm model of a Dirac-like particle, the electron in the ground state of the hydrogen atom is moving, unlike the prediction for the case of a Schr\\"{o}dinger-like particle, where the electron is stationary. This accounts for the empirically observed dilation of the decay time of the muon in the ground state of muonium.

B. J. Hiley

2014-12-18T23:59:59.000Z

372

Phantom of Higgs Boson Versus Hierarchy of Stationary States of Superhigh Energies  

E-Print Network [OSTI]

As is known, the Standard Model mainly ideologically and qualitatively focuss the experimenters in their search of new mass states (of EP- elementary particles). The exact quantitative prognosis of their properties, especially of masses, lays outside opportunities of the usual theory. Model of Stationary states of EP within the framework of the Wave Universe Concept [Chechelnitsky, 1980-2001] points on existence of Hierarchy of physically distinguished - stationary (elite, dominant) states described by the mass formulas, in particular, in a range 10-210 Gev/c^2. The states close to: ..., 101.5; 107.3; 112.76-113; 139.5-143; 147.6; 202 Gev/c^2 should be observed. Apparently, the experiment already confirms this prognosis in a range up to 100 Gev/c^2. You see preferable states, observable already now in experiment, it - not rejected by the usual theory as the candidates in constituents of Standard model (for example, not holding Higgs bosons), but quite real displays of stationary (first of all, -dominant) mass states. Last data of L3 (CERN) Collaboration really specify displays of new mass states and close to 103.7; 108.9; 114.5 Gev/c^2.

A. M. Chechelnitsky

2001-03-21T23:59:59.000Z

373

Technical and Economic Feasibility of Applying Used EV Batteries in Stationary Applications  

SciTech Connect (OSTI)

The technical and economic feasibility of applying used electric vehicle (EV) batteries in stationary applications was evaluated in this study. In addition to identifying possible barriers to EV battery reuse, steps needed to prepare the used EV batteries for a second application were also considered. Costs of acquiring, testing, and reconfiguring the used EV batteries were estimated. Eight potential stationary applications were identified and described in terms of power, energy, and duty cycle requirements. Costs for assembly and operation of battery energy storage systems to meet the requirements of these stationary applications were also estimated by extrapolating available data on existing systems. The calculated life cycle cost of a battery energy storage system designed for each application was then compared to the expected economic benefit to determine the economic feasibility. Four of the eight applications were found to be at least possible candidates for economically viable reuse of EV batteries. These were transmission support, light commercial load following, residential load following, and distributed node telecommunications backup power. There were no major technical barriers found, however further study is recommended to better characterize the performance and life of used EV batteries before design and testing of prototype battery systems.

CREADY, ERIN; LIPPERT, JOHN; PIHL, JOSH; WEINSTOCK, IRWIN; SYMONS, PHILIP

2003-03-01T23:59:59.000Z

374

Temporal transcriptomic analysis of Desulfovibrio vulgaris Hildenborough transition into stationary phase growth during electrondonor depletion  

SciTech Connect (OSTI)

Desulfovibrio vulgaris was cultivated in a defined medium, and biomass was sampled for approximately 70 h to characterize the shifts in gene expression as cells transitioned from the exponential to the stationary phase during electron donor depletion. In addition to temporal transcriptomics, total protein, carbohydrate, lactate, acetate, and sulfate levels were measured. The microarray data were examined for statistically significant expression changes, hierarchical cluster analysis, and promoter element prediction and were validated by quantitative PCR. As the cells transitioned from the exponential phase to the stationary phase, a majority of the down-expressed genes were involved in translation and transcription, and this trend continued at the remaining times. There were general increases in relative expression for intracellular trafficking and secretion, ion transport, and coenzyme metabolism as the cells entered the stationary phase. As expected, the DNA replication machinery was down-expressed, and the expression of genes involved in DNA repair increased during the stationary phase. Genes involved in amino acid acquisition, carbohydrate metabolism, energy production, and cell envelope biogenesis did not exhibit uniform transcriptional responses. Interestingly, most phage-related genes were up-expressed at the onset of the stationary phase. This result suggested that nutrient depletion may affect community dynamics and DNA transfer mechanisms of sulfate-reducing bacteria via the phage cycle. The putative feoAB system (in addition to other presumptive iron metabolism genes) was significantly up-expressed, and this suggested the possible importance of Fe{sup 2+} acquisition under metal-reducing conditions. The expression of a large subset of carbohydrate-related genes was altered, and the total cellular carbohydrate levels declined during the growth phase transition. Interestingly, the D. vulgaris genome does not contain a putative rpoS gene, a common attribute of the {delta}-Proteobacteria genomes sequenced to date, and the transcription profiles of other putative rpo genes were not significantly altered. Our results indicated that in addition to expected changes (e.g., energy conversion, protein turnover, translation, transcription, and DNA replication and repair), genes related to phage, stress response, carbohydrate flux, the outer envelope, and iron homeostasis played important roles as D. vulgaris cells experienced electron donor depletion.

Clark, M.E.; He, Q.; He, Z.; Huang, K.H.; Alm, E.J.; Wan, X.-F.; Hazen, T.C.; Arkin, A.P.; Wall, J.D.; Zhou, J.-Z.; Fields, M.W.

2006-08-01T23:59:59.000Z

375

Effects of Tungsten Oxide Addition on the Electrochemical Performance of Nanoscale Tantalum Oxide-Based Electrocatalysts for Proton Exchange Membrane PEM Fuel Cells  

SciTech Connect (OSTI)

In the present study, the properties of a series of non-platinum based nanoscale tantalum oxide/tungsten oxide-carbon composite catalysts was investigated for potential use in catalyzing the oxygen reduction reaction (ORR) on the cathode side of a PEM fuel cell membrane electrode assembly. Electrochemical performance was measured using a half-cell test set up with a rotating disc electrode and compared with a commercial platinum-on-carbon (Pt/C) catalyst. Overall, all of the oxide-based composite catalysts exhibit high ORR on-set potentials, comparable to that of the baseline Pt/C catalyst. The addition of tungsten oxide as a dopant to tantalum oxide greatly improved mass specific current density. Maximum performance was achieved with a catalyst containing 32 mol% of tungsten oxide, which exhibited a mass specific current density ~8% that of the Pt/C catalyst at 0.6 V vs. the normal hydrogen electrode (NHE) and ~35% that of the Pt/C catalyst at 0.2 V vs. NHE. Results from X-ray photoelectron spectroscopy analysis indicated that the tungsten cations in the composite catalysts exist in the +6 oxidation state, while the tantalum displays an average valence of +5, suggesting that the addition of tungsten likely creates an oxygen excess in the tantalum oxide structure that influences its oxygen absorption kinetics. When the 32mol% tungsten doped catalyst loading on the working electrode was increased to five times that of the original loading (which was equivalent to that of the baseline Pt/C catalyst), the area specific current density improved four fold, achieving an area specific current density ~35% that of the Pt/C catalyst at 0.6 V vs. NHE.

Oh, Tak Keun; Kim, Jin Yong; Shin, Yongsoon; Engelhard, Mark H.; Weil, K. Scott

2011-08-01T23:59:59.000Z

376

Stationary states and fractional dynamics in systems with long range interactions  

E-Print Network [OSTI]

Dynamics of many-body Hamiltonian systems with long range interactions is studied, in the context of the so called $\\alpha-$HMF model. Building on the analogy with the related mean field model, we construct stationary states of the $\\alpha-$HMF model for which the spatial organization satisfies a fractional equation. At variance, the microscopic dynamics turns out to be regular and explicitly known. As a consequence, dynamical regularity is achieved at the price of strong spatial complexity, namely a microscopic inhomogeneity which locally displays scale invariance.

Tineke L. Van Den Berg; Duccio Fanelli; Xavier Leoncini

2010-04-14T23:59:59.000Z

377

Stationary self-focusing of intense laser beam in cold quantum plasma using ramp density profile  

SciTech Connect (OSTI)

By using a transient density profile, we have demonstrated stationary self-focusing of an electromagnetic Gaussian beam in cold quantum plasma. The paper is devoted to the prospects of using upward increasing ramp density profile of an inhomogeneous nonlinear medium with quantum effects in self-focusing mechanism of high intense laser beam. We have found that the upward ramp density profile in addition to quantum effects causes much higher oscillation and better focusing of laser beam in cold quantum plasma in comparison to that in the classical relativistic case. Our computational results reveal the importance and influence of formation of electron density profiles in enhancing laser self-focusing.

Habibi, M. [Department of Physics, Shirvan Branch, Islamic Azad University, Shirvan (Iran, Islamic Republic of); Ghamari, F. [Department of Physics, Khorramabad Branch, Islamic Azad University, Khorramabad (Iran, Islamic Republic of)

2012-10-15T23:59:59.000Z

378

Communication: Newton homotopies for sampling stationary points of potential energy landscapes  

SciTech Connect (OSTI)

One of the most challenging and frequently arising problems in many areas of science is to find solutions of a system of multivariate nonlinear equations. There are several numerical methods that can find many (or all if the system is small enough) solutions but they all exhibit characteristic problems. Moreover, traditional methods can break down if the system contains singular solutions. Here, we propose an efficient implementation of Newton homotopies, which can sample a large number of the stationary points of complicated many-body potentials. We demonstrate how the procedure works by applying it to the nearest-neighbor ?{sup 4} model and atomic clusters.

Mehta, Dhagash, E-mail: dmehta@nd.edu [Department of Applied and Computational Mathematics and Statistics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); University Chemical Laboratory, The University of Cambridge, Cambridge CB2 1EW (United Kingdom); Chen, Tianran, E-mail: chentia1@msu.edu [Department of Mathematics, Michigan State University, East Lansing, Michigan 48823 (United States); Hauenstein, Jonathan D., E-mail: hauenstein@nd.edu [Department of Applied and Computational Mathematics and Statistics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Wales, David J., E-mail: dw34@cam.ac.uk [University Chemical Laboratory, The University of Cambridge, Cambridge CB2 1EW (United Kingdom)

2014-09-28T23:59:59.000Z

379

Poly-coil design for a 60 tesla quasi-stationary magnet  

SciTech Connect (OSTI)

Among the new facilities to be offered by the National Science Foundation through the National High Magnetic Field Laboratory (NHMFL) are pulsed fields that can only be achieved at a national user facility by virtue of their strength, duration, and volume. In particular, a 44 mm bore pulsed magnet giving a 60 tesla field for 1 00 ms is in the final design stage. This magnet will be powered by a 1.4 GW motor-generator at Los Alamos and is an important step toward proving design principles that will be needed for the higher field quasi-stationary pulsed magnets that this power source is capable of driving.

Boenig, H.J.; Campbell, L.J.; Hodgdon, M.L.; Lopez, E.A.; Rickel, D.G.; Rogers, J.D.; Schillig, J.B.; Sims, J.R. (Los Alamos National Lab., NM (United States)); Pernambuco-Wise, P.; Schneider-Muntau, H.J.; Van Bockstal, L. (Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab.)

1993-01-01T23:59:59.000Z

380

Poly-coil design for a 60 tesla quasi-stationary magnet  

SciTech Connect (OSTI)

Among the new facilities to be offered by the National Science Foundation through the National High Magnetic Field Laboratory (NHMFL) are pulsed fields that can only be achieved at a national user facility by virtue of their strength, duration, and volume. In particular, a 44 mm bore pulsed magnet giving a 60 tesla field for 1 00 ms is in the final design stage. This magnet will be powered by a 1.4 GW motor-generator at Los Alamos and is an important step toward proving design principles that will be needed for the higher field quasi-stationary pulsed magnets that this power source is capable of driving.

Boenig, H.J.; Campbell, L.J.; Hodgdon, M.L.; Lopez, E.A.; Rickel, D.G.; Rogers, J.D.; Schillig, J.B.; Sims, J.R. [Los Alamos National Lab., NM (United States); Pernambuco-Wise, P.; Schneider-Muntau, H.J.; Van Bockstal, L. [Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab.

1993-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

NON-STATIONARY TEMPERATURE STRESSES IN THE INDUSTRIAL STEAM TURBINE ROTOR  

E-Print Network [OSTI]

The usage of industrial steam turbines in different industrial branches (chemistry, petrochemistry, refineries, sugar and ethanol plants, etc.) for a generator drive for electricity generation or a mechanical drive for compressors, blowers and pumps, is characterized by the need for high flexibility of operation. High flexibility includes numerous start-ups, shut-downs and power changes during the useful life. Changes in power and steam mass flow lead to changes of the working fluid state in the single turbine stages, and thus their aerodynamic and thermodynamic characteristics. During these transient working regimes in steam turbine rotors, large space and time-dependent temperature gradients appear, which can result in high non-stationary temperature stresses, i.e. increased local stress concentrations, what has a negative impact on the useful life of the rotor. In the worst case they can cause fracture of the turbine rotor. Today, for the determination of thermal stressed state of the steam turbine parts the user softwares based on numerical methods are used. In this paper the results of numerical modelling and calculations of non-stationary temperature fields and related stresses in the rotor of industrial steam turbine of 35 MW power during transient operating regime (a cold startup) will be presented. The results of the calculations serve for estimation of the transient regime impact on the stresses of the rotor, as well as on its entire useful life. Key words: industrial steam turbine, transient regimes, temperature stresses, numerical modelling 1.

Zvonimir Guzovi?; Krešimir Kova?i?; Tihomir Mihali?

382

New Method for Evaluating Irreversible Adsorption and Stationary Phase Bleed in Gas Chromatographic Capillary Columns  

SciTech Connect (OSTI)

A novel method for the evaluation of gas chromatographic (GC) column inertness has been developed using a tandem GC approach. Typically column inertness is measured by analyte peak shape evaluation. In general, silica, glass, and metal surfaces are chemically reactive and can cause analyte adsorption, which typically is observed as chromatographic peak tailing. Adsorption processes produce broad, short chromatographic peaks that confound peak area determinations because a significant portion can reside in the noise. In addition, chromatographic surfaces and stationary phases can irreversibly adsorb certain analytes without obvious degradation of peak shape. The inertness measurements described in this work specifically determine the degree of irreversible adsorption behavior of specific target compounds at levels ranging from approximately 50 picograms to 1 nanogram on selected gas chromatographic columns. Chromatographic columns with 5% phenylmethylsiloxane, polyethylene glycol (wax), trifluoropropylsiloxane, and 78% cyanopropylsiloxane stationary phases were evaluated with a variety of phosphorus- and sulfur- containing compounds selected as test compounds due to their ease of adsorption and importance in trace analytical detection. In addition, the method was shown effective for characterizing column bleed.

Wright, Bob W.; Wright, Cherylyn W.

2012-10-26T23:59:59.000Z

383

Bayesian soft X-ray tomography using non-stationary Gaussian Processes  

SciTech Connect (OSTI)

In this study, a Bayesian based non-stationary Gaussian Process (GP) method for the inference of soft X-ray emissivity distribution along with its associated uncertainties has been developed. For the investigation of equilibrium condition and fast magnetohydrodynamic behaviors in nuclear fusion plasmas, it is of importance to infer, especially in the plasma center, spatially resolved soft X-ray profiles from a limited number of noisy line integral measurements. For this ill-posed inversion problem, Bayesian probability theory can provide a posterior probability distribution over all possible solutions under given model assumptions. Specifically, the use of a non-stationary GP to model the emission allows the model to adapt to the varying length scales of the underlying diffusion process. In contrast to other conventional methods, the prior regularization is realized in a probability form which enhances the capability of uncertainty analysis, in consequence, scientists who concern the reliability of their results will benefit from it. Under the assumption of normally distributed noise, the posterior distribution evaluated at a discrete number of points becomes a multivariate normal distribution whose mean and covariance are analytically available, making inversions and calculation of uncertainty fast. Additionally, the hyper-parameters embedded in the model assumption can be optimized through a Bayesian Occam's Razor formalism and thereby automatically adjust the model complexity. This method is shown to produce convincing reconstructions and good agreements with independently calculated results from the Maximum Entropy and Equilibrium-Based Iterative Tomography Algorithm methods.

Li, Dong; Svensson, J.; Thomsen, H.; Werner, A.; Wolf, R. [Max Planck Institute for Plasma Physics, Teilinstitut, D-17491 Greifswald (Germany)] [Max Planck Institute for Plasma Physics, Teilinstitut, D-17491 Greifswald (Germany); Medina, F. [Asociación EURATOM-CIEMAT, Madrid (Spain)] [Asociación EURATOM-CIEMAT, Madrid (Spain)

2013-08-15T23:59:59.000Z

384

Ammonia as an Alternative Energy Storage Medium for Hydrogen Fuel Cells: Scientific and Technical Review for Near-Term Stationary Power Demonstration Projects, Final Report  

E-Print Network [OSTI]

Stationary Reformers for Hydrogen Production,” Report to theAnalysis of Area II, Hydrogen Production Part II: HydrogenElectrolysis for Hydrogen Production,” J. Power Sources:

Lipman, Tim; Shah, Nihar

2007-01-01T23:59:59.000Z

385

Design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range  

SciTech Connect (OSTI)

Initial work in a project on the design and development of Stirling engines for stationary integrated energy systems is reported. Information is included on a market assessment, design methodology, evaluation of engine thermodynamic performance, and preliminary system design. It is concluded that Stirling engines employing clean fossil fuels cannot compete with diesel engines. However, combustion technology exists for the successful burning of coal-derived fuels in a large stationary stirling engine. High thermal efficiency is predicted for such an engine and further development work is recommended. (LCL)

None

1980-02-01T23:59:59.000Z

386

Aging management guideline for commercial nuclear power plants-stationary batteries. Final report  

SciTech Connect (OSTI)

The Aging Management Guideline (AMG) describes recommended methods for effective detection and mitigation of age-related degradation mechanisms in BWR and PWR commercial nuclear power plant stationary batteries important to license renewal. The intent of this AMG is to assist plant maintenance and operations personnel in maximizing the safe, useful life of these components. It also supports the documentation of effective aging management programs required under the License Renewal Rule 10 CFR Part 54. This AMG is presented in a manner that allows personnel responsible for performance analysis and maintenance to compare their plant-specific aging mechanisms (expected or already experienced) and aging management program activities to the more generic results and recommendations presented herein.

Berg, R.; Shao, J.; Krencicki, G.; Giachetti, R. [Multiple Dynamics Corp., Southfield, MI (United States)

1994-03-01T23:59:59.000Z

387

Artificial boundary conditions for stationary Navier-Stokes flows past bodies in the half-plane  

E-Print Network [OSTI]

We discuss artificial boundary conditions for stationary Navier-Stokes flows past bodies in the half-plane, for a range of low Reynolds numbers. When truncating the half-plane to a finite domain for numerical purposes, artificial boundaries appear. We present an explicit Dirichlet condition for the velocity at these boundaries in terms of an asymptotic expansion for the solution to the problem. We show a substantial increase in accuracy of the computed values for drag and lift when compared with results for traditional boundary conditions. We also analyze the qualitative behavior of the solutions in terms of the streamlines of the flow. The new boundary conditions are universal in the sense that they depend on a given body only through one constant, which can be determined in a feed-back loop as part of the solution process.

Boeckle, Christoph

2012-01-01T23:59:59.000Z

388

Emissions of volatile organic compounds from stationary combustion sources: Numerical modeling capabilities  

SciTech Connect (OSTI)

A collaborative research program initiated to study the emissions of a wide variety of chemical species from stationary combustion systems. These product species have been included in the Clean Air act legislation and their emissions must be rigidly controlled, but there is a need for much better understanding of the physical and chemical mechanisms that produce and consume them. We are using numerical modeling study the chemical reactions and fluid mechanical factors that occur in industrial processes: we are examining systems including premixed and diffusion flames, stirred reactors and plug flow reactors in these modeling studies to establish the major factors leading to emissions of these chemicals. In addition, we are applying advanced laser diagnostic techniques to validate the model predictions and to study the possibilities of developing sophisticated sensors to detect emissions of undesirable species in real time. This paper will discuss the organization of this collaborative effort and its results to date.

Seebold, J.G. [Chevron Research and Technology Co., Richmond, CA (United States); Kee, R.J.; Lutz, A.J. [Sandia National Labs., Albuquerque, NM (United States); Pitz, W.J.; Westbrook, C.K. [Lawrence Livermore National Lab., CA (United States); Senkan, S. [California Univ., Los Angeles, CA (United States)

1992-09-01T23:59:59.000Z

389

Helmet streamers with triple structure: Weakly two-dimensional stationary states  

E-Print Network [OSTI]

Recent observations of the solar corona with the LASCO coronagraph on board of the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to particularly huge coronal mass ejections. We present a method to calculate (semi-)analytically self-consistent stationary configurations of triple helmet streamers which can serve as input for stability considerations and dynamical calculations. The method is based on an asymptotic expansion procedure using the elongated structure of the streamers. The method is very flexible and can be used in both Cartesian and spherical geometry. We discuss the effects of magnetic shear, gravity and field-aligned flow on open field lines. Example solutions illustrating the influence of each of these features on the solution are presented.

T. Wiegelmann; K. Schindler; T. Neukirch

1997-12-01T23:59:59.000Z

390

Virial tests for post-Newtonian stationary black-hole-disk systems  

E-Print Network [OSTI]

We investigated hydrodynamical post-Newtonian models of selfgravitating stationary black-hole-disk systems. The post-Newtonian scheme presented here and also in our recent paper is a continuation of previous, purely Newtonian studies of selfgravitating hydrodynamical disks rotating according to the Keplerian rotation law. The post-Newtonian relativistic corrections are significant even at the 1PN level. The 1PN correction to the angular velocity can be of the order of 10% of its Newtonian value. It can be expressed as a combination of geometric and hydrodynamical terms. Moreover, in contrast to the Newtonian Poincare-Wavre theorem, it depends both on the distance from the rotation axis and the distance from the equatorial plane.

Jaranowski, Piotr; Malec, Edward; Pirog, Michal

2015-01-01T23:59:59.000Z

391

Kinetic theory of quasi-stationary collisionless axisymmetric plasmas in the presence of strong rotation phenomena  

SciTech Connect (OSTI)

The problem of formulating a kinetic treatment for quasi-stationary collisionless plasmas in axisymmetric systems subject to the possibly independent presence of local strong velocity-shear and supersonic rotation velocities is posed. The theory is developed in the framework of the Vlasov-Maxwell description for multi-species non-relativistic plasmas. Applications to astrophysical accretion discs arising around compact objects and to plasmas in laboratory devices are considered. Explicit solutions for the equilibrium kinetic distribution function (KDF) are constructed based on the identification of the relevant particle adiabatic invariants. These are shown to be expressed in terms of generalized non-isotropic Gaussian distributions. A suitable perturbative theory is then developed which allows for the treatment of non-uniform strong velocity-shear/supersonic plasmas. This yields a series representation for the equilibrium KDF in which the leading-order term depends on both a finite set of fluid fields as well as on the gradients of an appropriate rotational frequency. Constitutive equations for the fluid number density, flow velocity, and pressure tensor are explicitly calculated. As a notable outcome, the discovery of a new mechanism for generating temperature and pressure anisotropies is pointed out, which represents a characteristic feature of plasmas considered here. This is shown to arise as a consequence of the canonical momentum conservation and to contribute to the occurrence of temperature anisotropy in combination with the adiabatic conservation of the particle magnetic moment. The physical relevance of the result and the implications of the kinetic solution for the self-generation of quasi-stationary electrostatic and magnetic fields through a kinetic dynamo are discussed.

Cremaschini, Claudio; Stuchlík, Zden?k [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic)] [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic); Tessarotto, Massimo [Department of Mathematics and Geosciences, University of Trieste, Via Valerio 12, 34127 Trieste (Italy)] [Department of Mathematics and Geosciences, University of Trieste, Via Valerio 12, 34127 Trieste (Italy)

2013-05-15T23:59:59.000Z

392

The dispersive Alfvn wave in the time-stationary limit with a focus on collisional and warm-plasma effects  

E-Print Network [OSTI]

, the stationary inertial Alfvén StIA wave can accelerate electrons parallel to a background magnetic field properties of the StIA wave may play a role in the formation of discrete auroral arcs. Here, Knudsen's model

California at Los Angles, University of

393

1?10 kW Stationary Combined Heat and Power Systems Status and Technical Potential: Independent Review  

SciTech Connect (OSTI)

This independent review examines the status and technical potential of 1-10 kW stationary combined heat and power fuel cell systems and analyzes the achievability of the DOE cost, efficiency, and durability targets for 2012, 2015, and 2020.

Maru, H. C.; Singhal, S. C.; Stone, C.; Wheeler, D.

2010-11-01T23:59:59.000Z

394

Sigma S-Dependent Antioxidant Defense Protects Stationary-Phase Escherichia coli against the Bactericidal Antibiotic Gentamicin  

E-Print Network [OSTI]

elucidated. Loss of s rendered stationary-phase Esch- erichia coli more sensitive to the bactericidal. Use of the psfiA genetic reporter, 3=-(p-hydroxyphenyl) fluorescein (HPF) dye, and Amplex Red showed that Gm generated more reactive oxygen species (ROS) in the mutant. Gm did not cause cell elongation

Matin, A.C.

395

1–10 kW Stationary Combined Heat and Power Systems Status and Technical Potential: Independent Review  

Broader source: Energy.gov [DOE]

This independent review examines the status and technical potential of 1-10 kW stationary combined heat and power fuel cell systems and analyzes the achievability of the DOE cost, efficiency, and durability targets for 2012, 2015, and 2020.

396

Lipschitz stability for a coefficient inverse problem for the non-stationary transport equation via Carleman estimate  

E-Print Network [OSTI]

, theory of nuclear reactors, etc. (see, e.g., the book of Anikonov, Kovtanyuk and Prokhorov [1], and [6 in a scattering medium, etc. (see, e.g., the book of Case and Zweifel [6]). Coefficient inverse problems (CIPs] and in the book of Romanov [23]. Uniqueness and existence results for CIPs for the non-stationary transport

397

Evaluation of improved materials for stationary diesel engines operating on residual and coal based fuels. Final report  

SciTech Connect (OSTI)

Experimental results to date from an on-going research program on improved materials for stationary diesel engines using residual or coal-based fuels are presented with little discussion of conclusions about these results. Information is included on ring and liner wear, fuel oil qualities, ceramic materials, coatings, test procedures and equipment, and tribology test results. (LCL)

Not Available

1980-01-01T23:59:59.000Z

398

15 AUGUST 2002 2125H E L D E T A L . Northern Winter Stationary Waves: Theory and Modeling  

E-Print Network [OSTI]

15 AUGUST 2002 2125H E L D E T A L . Northern Winter Stationary Waves: Theory and Modeling ISAAC M; Valdes and Hoskins 1989; Ting 1994) his- tory has shown that one can make some progress in modeling these zonal asymmetries using linear models Corresponding author address: Dr. Isaac M. Held, NOAA

399

Automotive Perspective on PEM Evaluation  

Broader source: Energy.gov [DOE]

Presented at the 2009 High Temperature Membrane Working Group Meeting held May 18, 2009, in Arlington, Virginia

400

PEM Stack Manufacturing: Industry Status  

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 RankCombustion | Department ofT ib l L d F SSales LLCDieselEnergyHistory and

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

high temperature pem Degradation & Durability  

E-Print Network [OSTI]

A harmonious mix of renewable and alternative energy sources, including fuel cells is necessary to mitigate intermittency problems. The excess energy can be used to produce hydrogen from water or can be stored in liquid alcohols such as methanol, which can be sources of hydrogen for fuel cell applications. In addition, fuel

Berning, Torsten

402

RECOVERY AND SEQUESTRATION OF CO{sub 2} FROM STATIONARY COMBUSTION SYSTEMS BY PHOTOSYNTHESIS OF MICROALGAE  

SciTech Connect (OSTI)

Most of the anthropogenic emissions of carbon dioxide result from the combustion of fossil fuels for energy production. Photosynthesis has long been recognized as a means, at least in theory, to sequester anthropogenic carbon dioxide. Aquatic microalgae have been identified as fast growing species whose carbon fixing rates are higher than those of land-based plants by one order of magnitude. Physical Sciences Inc. (PSI), Aquasearch, and the Hawaii Natural Energy Institute at the University of Hawaii are jointly developing technologies for recovery and sequestration of CO{sub 2} from stationary combustion systems by photosynthesis of microalgae. The research is aimed primarily at demonstrating the ability of selected species of microalgae to effectively fix carbon from typical power plant exhaust gases. This report covers the reporting period 1 January to 31 March 2004 in which PSI, Aquasearch and University of Hawaii conducted their tasks. Based on the work during the previous reporting period, Aquasearch run first pilot scale production run with coal combustion gas to microalgae. Aquasearch started the second full scale carbon sequestration tests with propane combustion gases. Aquasearch also conducted modeling work to study the change in alkalinity in the medium resulting form microalgal photosynthesis and growth. University of Hawaii continued effort on system optimization of the CO{sub 2} sequestration system.

Takashi Nakamura; Miguel Olaizola; Stephen M. Masutani

2004-07-01T23:59:59.000Z

403

Waiting time distribution of solar energetic particle events modeled with a non-stationary Poisson process  

E-Print Network [OSTI]

We present a study of the waiting time distributions (WTDs) of solar energetic particle (SEP) events observed with the spacecraft $WIND$ and $GOES$. Both the WTDs of solar electron events (SEEs) and solar proton events (SPEs) display a power-law tail $\\sim \\Delta t^{-\\gamma}$. The SEEs display a broken power-law WTD. The power-law index is $\\gamma_{1} =$ 0.99 for the short waiting times ($$100 hours). The break of the WTD of SEEs is probably due to the modulation of the corotating interaction regions (CIRs). The power-law index $\\gamma \\sim$ 1.82 is derived for the WTD of SPEs that is consistent with the WTD of type II radio bursts, indicating a close relationship between the shock wave and the production of energetic protons. The WTDs of SEP events can be modeled with a non-stationary Poisson process which was proposed to understand the waiting time statistics of solar flares (Wheatland 2000; Aschwanden $\\&$ McTiernan 2010). We generalize the method and find that, if the SEP event rate $\\lambda = 1/\\Delt...

Li, Chuan; Wang, Linghua; Su, Wei; Fang, Cheng

2014-01-01T23:59:59.000Z

404

RECOVERY AND SEQUESTRATION OF CO2 FROM STATIONARY COMBUSTION SYSTEMS BY PHOTOSYNTHESIS OF MICROALGAE  

SciTech Connect (OSTI)

Most of the anthropogenic emissions of carbon dioxide result from the combustion of fossil fuels for energy production. Photosynthesis has long been recognized as a means, at least in theory, to sequester anthropogenic carbon dioxide. Aquatic microalgae have been identified as fast growing species whose carbon fixing rates are higher than those of land-based plants by one order of magnitude. Physical Sciences Inc. (PSI), Aquasearch, and the Hawaii Natural Energy Institute at the University of Hawaii are jointly developing technologies for recovery and sequestration of CO{sub 2} from stationary combustion systems by photosynthesis of microalgae. The research is aimed primarily at demonstrating the ability of selected species of microalgae to effectively fix carbon from typical power plant exhaust gases. This report covers the reporting period 1 October to 31 December 2004 in which PSI, Aquasearch and University of Hawaii conducted their tasks. Based on the work during the previous reporting period, Aquasearch run the first set of experiments with actual coal combustion gases with two different strains of microalgae. In addition further, full scale carbon sequestration tests with propane combustion gases were conducted. Aquasearch continued testing modifications to the coal combustor to allow for longer-term burns.

Takashi Nakamura; Miguel Olaizola; Stephen M. Masutani

2005-03-01T23:59:59.000Z

405

Test method for the measurement of methanol emissions from stationary sources  

SciTech Connect (OSTI)

Methanol was designated under Title III of the Clean Air Act Amendments of 1990 as a pollutant to be regulated. A test method has been developed for the measurement of methanol emissions from stationary sources. The methanol sampling train (MST) consists of a glass-lined heated probe, two condensate knockout traps, and three sorbent cartridges packed with Anasorb 747. The Anasorb samples were desorbed with a 1:1 mixture of carbon disulfide and N,N-dimethylformamide. All samples were analyzed by gas chromatography with flame ionization detection. Following laboratory testing, field tests of the MST and the National Council of the Paper Industry for Air and Stream Improvement (NCASI) sampling method for methanol were conducted at two pulp and paper mills. In accordance with EPA Methol 301, two pairs of trains were run in parallel for six runs, collecting a total of 24 samples by each method. During each run, half of the trains were spiked with a known amount of methanol. The sampling location at the first test was an inlet vent to a softwood bleach plant scrubber where the methanol concentration was about 30 ppm. A second field test was conducted at the vent of a black liquor oxidation tank where the methanol concentration was about 350 ppm. Samples were shown to be stable for at least 2 weeks after collection.

Pate, B.A.; Peterson, M.R.; Rickman, E.E.; Jayanty, R.K.M.

1994-05-01T23:59:59.000Z

406

RECOVERY AND SEQUESTRATION OF CO2 FROM STATIONARY COMBUSTION SYSTEMS BY PHOTOSYNTHESIS OF MICROALGAE  

SciTech Connect (OSTI)

Most of the anthropogenic emissions of carbon dioxide result from the combustion of fossil fuels for energy production. Photosynthesis has long been recognized as a means, at least in theory, to sequester anthropogenic carbon dioxide. Aquatic microalgae have been identified as fast growing species whose carbon fixing rates are higher than those of land-based plants by one order of magnitude. Physical Sciences Inc. (PSI), Aquasearch, and the Hawaii Natural Energy Institute at the University of Hawaii are jointly developing technologies for recovery and sequestration of CO{sub 2} from stationary combustion systems by photosynthesis of microalgae. The research is aimed primarily at demonstrating the ability of selected species of microalgae to effectively fix carbon from typical power plant exhaust gases. This report covers the reporting period 1 July to 30 September 2004 in which PSI, Aquasearch and University of Hawaii conducted their tasks. Based on the work during the previous reporting period, Aquasearch run the first set of experiments with actual coal combustion gases with two different strains of microalgae. In addition further, full scale carbon sequestration tests with propane combustion gases were conducted. Aquasearch continued testing modifications to the coal combustor to allow for longer-term burns.

Takashi Nakamura; Miguel Olaizola; Stephen M. Masutani

2004-12-01T23:59:59.000Z

407

RECOVERY AND SEQUESTRATION OF CO2 FROM STATIONARY COMBUSTION SYSTEMS BY PHOTOSYNTHESIS OF MICROALGAE  

SciTech Connect (OSTI)

Most of the anthropogenic emissions of carbon dioxide result from the combustion of fossil fuels for energy production. Photosynthesis has long been recognized as a means, at least in theory, to sequester anthropogenic carbon dioxide. Aquatic microalgae have been identified as fast growing species whose carbon fixing rates are higher than those of land-based plants by one order of magnitude. Physical Sciences Inc. (PSI), Aquasearch, and the Hawaii Natural Energy Institute at the University of Hawaii are jointly developing technologies for recovery and sequestration of CO{sub 2} from stationary combustion systems by photosynthesis of microalgae. The research is aimed primarily at demonstrating the ability of selected species of microalgae to effectively fix carbon from typical power plant exhaust gases. This report covers the reporting period 1 April to 30 June 2004 in which PSI, Aquasearch and University of Hawaii conducted their tasks. Based on the work during the previous reporting period, Aquasearch run further, pilot and full scale, carbon sequestration tests with actual propane combustion gases utilizing two different strains of microalgae. Aquasearch continued testing modifications to the coal combustor to allow for longer-term burns. Aquasearch also tested an alternative cell separation technology. University of Hawaii performed experiments at the Mera Pharmaceuticals facility in Kona in mid June to obtain data on the carbon venting rate out of the photobioreactor; gas venting rates were measured with an orifice flow meter and gas samples were collected for GC analysis to determine the carbon content of the vented gases.

Takashi Nakamura

2004-11-01T23:59:59.000Z

408

Asymptotically Stationary and Static Space-times and Shear-free Null Geodesic Congruences  

E-Print Network [OSTI]

In classical electromagnetic theory, one formally defines the complex dipole moment (the electric plus 'i' magnetic dipole) and then computes (and defines) the complex center of charge by transforming to a complex frame where the complex dipole moment vanishes. Analogously in asymptotically flat space-times it has been shown that one can determine the complex center of mass by transforming the complex gravitational dipole (mass dipole plus 'i' angular momentum) (via an asymptotic tetrad trasnformation) to a frame where the complex dipole vanishes. We apply this procedure to such space-times which are asymptotically stationary or static, and observe that the calculations can be performed exactly, without any use of the approximation schemes which must be employed in general. In particular, we are able to exactly calculate complex center of mass and charge world-lines for such space-times, and - as a special case - when these two complex world-lines coincide, we recover the Dirac value of the gyromagnetic ratio.

T. M. Adamo; E. T. Newman

2009-06-12T23:59:59.000Z

409

Solvent viscosity effect on quenching rate constants of phenophytin a fluorescence by quinones. Role of non-stationary effects  

SciTech Connect (OSTI)

The fluorescence quenching of phenophytin a by quinones in different solvents has been studied with a steady-state and pulse photoexcitation. The quenching in alcohols is caused by complexes which are spectrally undetectable. In other solvents the quenching is dynamic. The effect of viscosity on the quenching rate has been studied. It has been found that the non-stationary effects play a substantial role in the quenching process.

Kapinus, E.I.; Dilung II.; Kucherova, I.Y.; Kuz'min, M.G.; Zartsev, N.K.

1986-11-01T23:59:59.000Z

410

Nonlinear, stationary electrostatic ion cyclotron waves: Exact solutions for solitons, periodic waves, and wedge shaped waveforms  

SciTech Connect (OSTI)

The theory of fully nonlinear stationary electrostatic ion cyclotron waves is further developed. The existence of two fundamental constants of motion; namely, momentum flux density parallel to the background magnetic field and energy density, facilitates the reduction of the wave structure equation to a first order differential equation. For subsonic waves propagating sufficiently obliquely to the magnetic field, soliton solutions can be constructed. Importantly, analytic expressions for the amplitude of the soliton show that it increases with decreasing wave Mach number and with increasing obliquity to the magnetic field. In the subsonic, quasi-parallel case, periodic waves exist whose compressive and rarefactive amplitudes are asymmetric about the 'initial' point. A critical 'driver' field exists that gives rise to a soliton-like structure which corresponds to infinite wavelength. If the wave speed is supersonic, periodic waves may also be constructed. The aforementioned asymmetry in the waveform arises from the flow being driven towards the local sonic point in the compressive phase and away from it in the rarefactive phase. As the initial driver field approaches the critical value, the end point of the compressive phase becomes sonic and the waveform develops a wedge shape. This feature and the amplitudes of the compressive and rarefactive portions of the periodic waves are illustrated through new analytic expressions that follow from the equilibrium points of a wave structure equation which includes a driver field. These expressions are illustrated with figures that illuminate the nature of the solitons. The presently described wedge-shaped waveforms also occur in water waves, for similar 'transonic' reasons, when a Coriolis force is included.

McKenzie, J. F. [Department of Mathematics, Statistics and Physics, Durban University of Technology, Steve Biko Campus, Durban 4001 (South Africa); School of Mathematical Sciences, University of KwaZulu-Natal, Private Bag: X54001, Durban 4001 (South Africa); Doyle, T. B. [Materials Research Division, iThemba LABS, P.O.Box 722, Somerset West, 7129, South Africa and School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag: X54001, Durban 4001 (South Africa); Rajah, S. S. [Department of Mathematics, Statistics and Physics, Durban University of Technology, Steve Biko Campus, Durban 4001 (South Africa)

2012-11-15T23:59:59.000Z

411

A Total Cost of Ownership Model for Low Temperature PEM Fuel Cells in Combined Heat and Power and Backup Power Applications  

SciTech Connect (OSTI)

A total cost of ownership model is described for low temperature proton exchange membrane stationary fuel cell systems for combined heat and power (CHP) applications from 1-250kW and backup power applications from 1-50kW. System designs and functional specifications for these two applications were developed across the range of system power levels. Bottom-up cost estimates were made for balance of plant costs, and detailed direct cost estimates for key fuel cell stack components were derived using design-for-manufacturing-and-assembly techniques. The development of high throughput, automated processes achieving high yield are projected to reduce the cost for fuel cell stacks to the $300/kW level at an annual production volume of 100 MW. Several promising combinations of building types and geographical location in the U.S. were identified for installation of fuel cell CHP systems based on the LBNL modelling tool DER CAM. Life-cycle modelling and externality assessment were done for hotels and hospitals. Reduced electricity demand charges, heating credits and carbon credits can reduce the effective cost of electricity ($/kWhe) by 26-44percent in locations such as Minneapolis, where high carbon intensity electricity from the grid is displaces by a fuel cell system operating on reformate fuel. This project extends the scope of existing cost studies to include externalities and ancillary financial benefits and thus provides a more comprehensive picture of fuel cell system benefits, consistent with a policy and incentive environment that increasingly values these ancillary benefits. The project provides a critical, new modelling capacity and should aid a broad range of policy makers in assessing the integrated costs and benefits of fuel cell systems versus other distributed generation technologies.

University of California, Berkeley; Wei, Max; Lipman, Timothy; Mayyas, Ahmad; Chien, Joshua; Chan, Shuk Han; Gosselin, David; Breunig, Hanna; Stadler, Michael; McKone, Thomas; Beattie, Paul; Chong, Patricia; Colella, Whitney; James, Brian

2014-06-23T23:59:59.000Z

412

Stationary components of HeI in strong magnetic fields - a tool to identify magnetic DB white dwarfs  

E-Print Network [OSTI]

In only three of the 61 known magnetic white dwarfs helium has been identified unambiguously while about 20% of all non-magnetic stars of this class are known to contain HeI or HeII. Until recently, data for HeI data were available only for magnetic fields below 20MG. This changed with the publication of extensive data by the group in Heidelberg. The corresponding calculations have now been completed for the energetically lowest five states of singlet and triplet symmetry for the subspaces with |m| <= 3; selected calculations have been performed for even higher excitations. In strongly magnetized white dwarfs only line components are visible whose wavelengths vary slowly with respect to the magnetic field, particularly stationary components which have a wavelength minimum or maximum in the range of the magnetic fields strengths on the stellar surface. In view of the many ongoing surveys finding white dwarfs we want to provide the astronomical community with a tool to identify helium in white dwarfs for fields up to 5.3GG. To this end we present all calculated helium line components whose wavelengths in the UV, optical, and near IR vary slowly enough with respect to the field strength to produce visible absorption features. We also list all stationary line components in this spectral range. Finally, we find series of minima and maxima which occur as a result of series of extremal transitions to increasingly higher excitations. We estimated the limits for 8 series which can possibly give rise to additional absorption in white dwarf spectra; one strong absorption feature in GD229 which is yet unexplained by stationary components is very close to two estimated series limits.

S. Jordan; P. Schmelcher; W. Becken

2001-06-29T23:59:59.000Z

413

Selective NOx Recirculation for Stationary Lean-Burn Natural Gas Engines  

SciTech Connect (OSTI)

Nitric oxide (NO) and nitrogen dioxide (NO2) generated by internal combustion (IC) engines are implicated in adverse environmental and health effects. Even though lean-burn natural gas engines have traditionally emitted lower oxides of nitrogen (NOx) emissions compared to their diesel counterparts, natural gas engines are being further challenged to reduce NOx emissions to 0.1 g/bhp-hr. The Selective NOx Recirculation (SNR) approach for NOx reduction involves cooling the engine exhaust gas and then adsorbing the NOx from the exhaust stream, followed by the periodic desorption of NOx. By sending the desorbed NOx back into the intake and through the engine, a percentage of the NOx can be decomposed during the combustion process. SNR technology has the support of the Department of Energy (DOE), under the Advanced Reciprocating Engine Systems (ARES) program to reduce NOx emissions to under 0.1 g/bhp-hr from stationary natural gas engines by 2010. The NO decomposition phenomenon was studied using two Cummins L10G natural gas fueled spark-ignited (SI) engines in three experimental campaigns. It was observed that the air/fuel ratio ({lambda}), injected NO quantity, added exhaust gas recirculation (EGR) percentage, and engine operating points affected NOx decomposition rates within the engine. Chemical kinetic model predictions using the software package CHEMKIN were performed to relate the experimental data with established rate and equilibrium models. The model was used to predict NO decomposition during lean-burn, stoichiometric burn, and slightly rich-burn cases with added EGR. NOx decomposition rates were estimated from the model to be from 35 to 42% for the lean-burn cases and from 50 to 70% for the rich-burn cases. The modeling results provided an insight as to how to maximize NOx decomposition rates for the experimental engine. Results from this experiment along with chemical kinetic modeling solutions prompted the investigation of rich-burn operating conditions, with added EGR to prevent preignition. It was observed that the relative air/fuel ratio, injected NO quantity, added EGR fraction, and engine operating points affected the NO decomposition rates. While operating under these modified conditions, the highest NO decomposition rate of 92% was observed. In-cylinder pressure data gathered during the experiments showed minimum deviation from peak pressure as a result of NO injections into the engine. A NOx adsorption system, from Sorbent Technologies, Inc., was integrated with the Cummins engine, comprised a NOx adsorbent chamber, heat exchanger, demister, and a hot air blower. Data were gathered to show the possibility of NOx adsorption from the engine exhaust, and desorption of NOx from the sorbent material. In order to quantify the NOx adsorption/desorption characteristics of the sorbent material, a benchtop adsorption system was constructed. The temperature of this apparatus was controlled while data were gathered on the characteristics of the sorbent material for development of a system model. A simplified linear driving force model was developed to predict NOx adsorption into the sorbent material as cooled exhaust passed over fresh sorbent material. A mass heat transfer analysis was conducted to analyze the possibility of using hot exhaust gas for the desorption process. It was found in the adsorption studies, and through literature review, that NO adsorption was poor when the carrier gas was nitrogen, but that NO in the presence of oxygen was adsorbed at levels exceeding 1% by mass of the sorbent. From the three experimental campaigns, chemical kinetic modeling analysis, and the scaled benchtop NOx adsorption system, an overall SNR system model was developed. An economic analysis was completed, and showed that the system was impractical in cost for small engines, but that economies of scale favored the technology.

Nigel N. Clark

2006-12-31T23:59:59.000Z

414

Procuring Stationary Fuel Cells For CHP: A Guide for Federal Facility Decision Makers  

SciTech Connect (OSTI)

Federal agency leaders are expressing growing interest in using innovative fuel cell combined heat and power (CHP) technology at their sites, motivated by both executive branch sustainability targets and a desire to lead by example in the transition to a clean energy economy. Fuel cell CHP can deliver reliable electricity and heat with 70% to 85% efficiency. Implementing this technology can be a high efficiency, clean energy solution for agencies striving to meet ambitious sustainability requirements with limited budgets. Fuel cell CHP systems can use natural gas or renewable fuels, such as biogas. Procuring Stationary Fuel Cells for CHP: A Guide for Federal Facility Decision Makers presents an overview of the process for planning and implementing a fuel cell CHP project in a concise, step-by-step format. This guide is designed to help agency leaders turn their interest in fuel cell technology into successful installations. This guide concentrates on larger (100 kW and greater) fuel cell CHP systems and does not consider other fuel cell applications such as cars, forklifts, backup power supplies or small generators (<100 kW). Because fuel cell technologies are rapidly evolving and have high up front costs, their deployment poses unique challenges. The electrical and thermal output of the CHP system must be integrated with the building s energy systems. Innovative financing mechanisms allow agencies to make a make versus buy decision to maximize savings. This guide outlines methods that federal agencies may use to procure fuel cell CHP systems with little or no capital investment. Each agency and division, however, has its own set of procurement procedures. This guide was written as a starting point, and it defers to the reader s set of rules if differences exist. The fuel cell industry is maturing, and project developers are gaining experience in working with federal agencies. Technology improvements, cost reductions, and experienced project developers are making fuel cell projects easier to put into service. In this environment, federal decision makers can focus on being smart buyers of fuel cell energy instead of attempting to become experts in fuel cell technology. For agencies that want to pursue a fuel cell CHP this guide presents a four step process for a successful project. 1. Perform a preliminary screening of the energy needs energy costs and incentives. 2. Compare a detailed project plan. 3. Make a financing and contracting decision. 4. Execute the project plan including financing, installation, and operation. The simplest procurement method is designated funding for the outright purchase of the fuel cell CHP system, although this is usually not the most cost-effective option. This guide describes the following financing options: Power purchase agreement Energy savings performance contract Utility energy services contract Enhanced use lease Fuel cell CHP technology can help federal facility managers comply with agency objectives for reducing energy consumption and air pollution emissions. Fuel cells do not generate particulate pollutants, unburned hydrocarbons or the gases that produce acid rain. Fuel cells emit less carbon dioxide (CO2) than other, less efficient technologies and use of renewable fuels can make them carbon neutral. Fuel cell CHP technology can deliver reliable electricity and heat with high efficiency (70% to 85%) in a small physical footprint with little noise, making it a cost-effective option for federal facilities.

Stinton, David P [ORNL; McGervey, Joseph [SRA International, Inc.; Curran, Scott [ORNL

2011-11-01T23:59:59.000Z

415

The dispersive Alfven wave in the time-stationary limit with a focus on collisional and warm-plasma effects  

SciTech Connect (OSTI)

A nonlinear, collisional, two-fluid model of uniform plasma convection across a field-aligned current (FAC) sheet, describing the stationary Alfven (StA) wave, is presented. In a previous work, Knudsen showed that, for cold, collisionless plasma [D. J. Knudsen, J. Geophys. Res. 101, 10761 (1996)], the stationary inertial Alfven (StIA) wave can accelerate electrons parallel to a background magnetic field and cause large, time-independent plasma-density variations having spatial periodicity in the direction of the convective flow over a broad range of spatial scales and energies. Knudsen suggested that these fundamental properties of the StIA wave may play a role in the formation of discrete auroral arcs. Here, Knudsen's model has been generalized for warm, collisional plasma. From this generalization, it is shown that nonzero ion-neutral and electron-ion collisional resistivity significantly alters the perpendicular ac and dc structure of magnetic-field-aligned electron drift, and can either dissipate or enhance the field-aligned electron energy depending on the initial value of field-aligned electron drift velocity. It is also shown that nonzero values of plasma pressure increase the dominant Fourier component of perpendicular wavenumber.

Finnegan, S. M.; Koepke, M. E. [Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315 (United States); Knudsen, D. J. [Department of Physics and Astronomy, University of Calgary, Calgary, Alberta (Canada)

2008-05-15T23:59:59.000Z

416

Low-rank approximations for large stationary covariance matrices, as used in the Bayesian and generalized-least-squares analysis of pulsar-timing data  

E-Print Network [OSTI]

Many data-analysis problems involve large dense matrices that describe the covariance of stationary noise processes; the computational cost of inverting these matrices, or equivalently of solving linear systems that contain them, is often a practical limit for the analysis. We describe two general, practical, and accurate methods to approximate stationary covariance matrices as low-rank matrix products featuring carefully chosen spectral components. These methods can be used to greatly accelerate data-analysis methods in many contexts, such as the Bayesian and generalized-least-squares analysis of pulsar-timing residuals.

Rutger van Haasteren; Michele Vallisneri

2014-07-24T23:59:59.000Z

417

Does f(R,T) gravity admit a stationary scenario between dark energy and dark matter in its framework?  

E-Print Network [OSTI]

In this note we address the well-known cosmic coincidence problem in the framework of the \\textit{f(R,T)} gravity. In order to achieve this, an interaction between dark energy and dark matter is considered. A constraint equation is obtained which filters the \\textit{f(R,T)} models that produce a stationary scenario between dark energy and dark matter. Due to the absence of a universally accepted interaction term introduced by a fundamental theory, the study is conducted over three different forms of chosen interaction terms. As an illustration three widely known models of \\textit{f(R,T)} gravity are taken into consideration and used in the setup designed to study the problem. The study reveals that, the realization of the coincidence scenario is almost impossible for the popular models of $f(R,T)$ gravity, thus proving to be a major setback for these models.

Rudra, Prabir

2015-01-01T23:59:59.000Z

418

The Energy-Level Shifts of a Stationary Hydrogen Atom in Static External Gravitational Field with Schwarzschild Geometry  

E-Print Network [OSTI]

The first order perturbations of the energy levels of a stationary hydrogen atom in static external gravitational field, with Schwarzschild metric, are investigated. The energy shifts are calculated for the relativistic 1S, 2S, 2P, 3S, 3P, 3D, 4S, 4P, 4D and 4F levels. The results show that the energy-level shifts of the states with total angular momentum quantum number 1/2 are all zero, and the ratio of absolute energy shifts with total angular momentum quantum number 5/2 is 1:4:5. This feature can be used to help us to distinguish the gravitational effect from other effect.

Zhen-Hua Zhao; Yu-Xiao Liu; Xi-Guo Li

2007-09-17T23:59:59.000Z

419

DEVELOPMENT OF A NATURAL GAS TO HYDROGEN FUEL STATION William E. Liss  

E-Print Network [OSTI]

for compressed natural gas vehicles. The integrated natural gas-to-hydrogen system includes a high efficiency on leveraging of developments in the stationary PEM fuel cell and compressed natural gas vehicle market sectors

420

Non-Pt Electrocatalysts DOE Program/Targets and Workshop Objectives  

E-Print Network [OSTI]

for transportation and stationary applications Program Focus · Fuel cell stack component cost reduction (catalyst barriers Assist suppliers Independent T&E Advanced concepts Analysis & Modeling DEVELOPERS PEM Fuel Cell of Energy Hydrogen, Fuel Cells and Infrastructure Technologies Program http

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Stationary IPA Estimates for NonSmooth G/G/1/1 Functionals via Palm Inversion and LevelCrossing Analysis. \\Lambda  

E-Print Network [OSTI]

Stationary IPA Estimates for Non­Smooth G/G/1/1 Functionals via Palm Inversion and Level Infinitesimal Perturbation Analysis (IPA), a method first introduced by Ho and Cao [13] and further developed and Cao [14] summarize and review most previous results on IPA. Alternative methods have been used

Lasgouttes, Jean-Marc

422

Stationary Solutions of the NavierStokes Equations in a HalfPlane DownStream of an Object: Universality of the Wake  

E-Print Network [OSTI]

Stationary Solutions of the Navier­Stokes Equations in a Half­Plane Down­Stream of an Object in the down--stream direction, the leading order deviation from the constant flow is universal, i--Stokes equations can be interpreted as a dynamical system, the down--stream direction playing the role of time

423

Ballard fuel cell development for the new energy environment  

SciTech Connect (OSTI)

Ballard Power Systems is the world leader in the development of Proton Exchange Membrane (PEM) fuel cells. PEM fuel cells use a solid polymer membrane as the electrolyte. These fuel cells are compact and produce powerful electric current relative to their size. PEM fuel cells can deliver higher power density than other types of fuel cells, resulting in reduced cost, weight and volume, and improved performance. The PEM fuel cell is the only fuel cell considered practical for both transportation and stationary applications. Ballard fuel cells are the heart of BGS`s products. The proprietary zero-emission engine converts natural gas, methanol or hydrogen fuel into electricity without combustion.

Dunnison, D.; Smith, D. [Ballard Power Systems, Inc., Burnaby, British Columbia (Canada); Torpey, J. [GPU International, Parsippany, NJ (United States)

1997-09-01T23:59:59.000Z

424

Development of Polybenzimidazole-Based High-Temperature Membrane and Electrode Assemblies for Stationary and Automotive Applications  

SciTech Connect (OSTI)

The program began on August 1, 2003 and ended on July 31, 2007. The goal of the project was to optimize a high-temperature polybenzimidazole (PBI) membrane to meet the performance, durability, and cost targets required for stationary fuel cell applications. These targets were identified in the Fuel Cell section (3.4) of DOE’s Hydrogen, Fuel Cells and Infrastructure Technologies Program Multi-Year Research, Development and Demonstration Plan. A membrane that operates at high temperatures is important to the fuel cell industry because it is insensitive to carbon monoxide (a poison to low-temperature fuel cells), and does not require complex water management strategies. Together, these two benefits greatly simplify the fuel cell system. As a result, the high-temperature fuel cell system realizes a cost benefit as the number of components is reduced by nearly 30%. There is also an inherent reliability benefit as components such as humidifiers and pumps for water management are unnecessary. Furthermore, combined heat and power (CHP) systems may be the best solution for a commercial, grid-connected, stationary product that must offer a cost benefit to the end user. For a low-temperature system, the quality of the heat supplied is insufficient to meet consumer needs and comfort requirements, so peak heaters or supplemental boilers are required. The higher operating temperature of PBI technology allows the fuel cell to meet the heat and comfort demand without the additional equipment. Plug Power, working with the Rensselaer Polytechnic Institute (RPI) Polymer Science Laboratory, made significant advances in optimizing the PBI membrane material for operation at temperatures greater than 160oC with a lifetime of 40,000 hours. Supporting hardware such as flow field plates and a novel sealing concept were explored to yield the lower-cost stack assembly and corresponding manufacturing process. Additional work was conducted on acid loss, flow field design and cathode electrode development. Membranes and MEAs were supplied by team member BASF Fuel Cell (formerly PEMEAS), a manufacturer of polymer and fiber. Additional subcontractors Entegris, the University of South Carolina (USC) Fuel Cell Center, and RPI’s Fuel Cell Center conducted activities with regard to stack sealing, acid modeling, and electrode development.

Vogel, John A.

2008-09-03T23:59:59.000Z

425

Manufacturing Cost Analysis of Novel Steel/Concrete Composite Vessel for Stationary Storage of High-Pressure Hydrogen  

SciTech Connect (OSTI)

A novel, low-cost, high-pressure, steel/concrete composite vessel (SCCV) technology for stationary storage of compressed gaseous hydrogen (CGH2) is currently under development at Oak Ridge National Laboratory (ORNL) sponsored by DOE s Fuel Cell Technologies (FCT) Program. The SCCV technology uses commodity materials including structural steels and concretes for achieving cost, durability and safety requirements. In particular, the hydrogen embrittlement of high-strength low-alloy steels, a major safety and durability issue for current industry-standard pressure vessel technology, is mitigated through the use of a unique layered steel shell structure. This report presents the cost analysis results of the novel SCCV technology. A high-fidelity cost analysis tool is developed, based on a detailed, bottom-up approach which takes into account the material and labor costs involved in each of the vessel manufacturing steps. A thorough cost study is performed to understand the SCCV cost as a function of the key vessel design parameters, including hydrogen pressure, vessel dimensions, and load-carrying ratio. The major conclusions include: The SCCV technology can meet the technical/cost targets set forth by DOE s FCT Program for FY2015 and FY2020 for all three pressure levels (i.e., 160, 430 and 860 bar) relevant to the hydrogen production and delivery infrastructure. Further vessel cost reduction can benefit from the development of advanced vessel fabrication technologies such as the highly automated friction stir welding (FSW). The ORNL-patented multi-layer, multi-pass FSW can not only reduce the amount of labor needed for assembling and welding the layered steel vessel, but also make it possible to use even higher strength steels for further cost reductions and improvement of vessel structural integrity. It is noted the cost analysis results demonstrate the significant cost advantage attainable by the SCCV technology for different pressure levels when compared to the industry-standard pressure vessel technology. The real-world performance data of SCCV under actual operating conditions is imperative for this new technology to be adopted by the hydrogen industry for stationary storage of CGH2. Therefore, the key technology development effort in FY13 and subsequent years will be focused on the fabrication and testing of SCCV mock-ups. The static loading and fatigue data will be generated in rigorous testing of these mock-ups. Successful tests are crucial to enabling the near-term impact of the developed storage technology on the CGH2 storage market, a critical component of the hydrogen production and delivery infrastructure. In particular, the SCCV has high potential for widespread deployment in hydrogen fueling stations.

Feng, Zhili [ORNL; Zhang, Wei [ORNL; Wang, Jy-An John [ORNL; Ren, Fei [ORNL

2012-09-01T23:59:59.000Z

426

Dynamic Changes in LSM Nanoparticles on YSZ: A Model System for Non-stationary SOFC Cathode Behavior  

SciTech Connect (OSTI)

The interaction between nanoparticles of strontium-doped lanthanum manganite (LSM) and single crystal yttria-stabilized zirconia (YSZ) was investigated using atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM)/energy-dispersive x-ray spectroscopy (EDX). Nanoparticles of LSM were deposited directly onto single crystal YSZ substrates (100) using an ultrasonic spray nozzle. As samples were annealed from 850 C to 1250 C, nanoparticles gradually decreased in height and eventually disappeared completely. Subsequent reduction in H{sub 2}/H{sub 2}O at 700 C resulted in the reappearance of nanoparticles. Studies were carried out on identical regions of the sample allowing the same nanoparticles to be characterized at different temperatures. Morphological changes indicate the formation of a thin layer of LSM, and XPS results support the observation by indicating an increase in signal from the La and Sr and a decrease in signal from the Y and Zr with increasing temperature. SEM/EDX was used to verify that the nanoparticles in the reduced sample contained La. The changes in the LSM/YSZ morphology may be important in explaining the non-stationary behavior observed in operating fuel cells. The thin layer of LSM initially results in poor cathode performance; reducing conditions then lead to film disruptions, indicating nano/microporosity, that increase oxygen ion diffusion and performance.

Woo, L Y; Glass, R S; Gorte, R J; Orme, C A; Nelson, A J

2009-01-05T23:59:59.000Z

427

Transportation and Stationary Power  

E-Print Network [OSTI]

and gas companies, retail gasoline station owners) will not be likely to assume the financial risk of building hydrogen fueling stations without an assured consumer demand for the hydrogen. On the other hand significant quantity in the absence of convenient, publicly accessible hydrogen refueling stations. To address

428

Trends in stationary 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 RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7 thFuel27, 2008,Inc. |DesignedJeff

429

Procedure for Performing PEM Single Cell Testing  

Broader source: Energy.gov [DOE]

Presented at the 2009 High Temperature Membrane Working Group Meeting held May 18, 2009, in Arlington, Virginia

430

Transition Metal Sulfide Electrocatalysts for PEM Fuel  

E-Print Network [OSTI]

and Allan J. Jacobson1 Alejandra Ramirez2 and Russell R. Chianelli2 1Department of Chemistry, University Verde-Gómez1 and Allan J. Jacobson1 Alejandra Ramirez2 and Russell R. Chianelli2 1Department

431

Polyphenylene Sulfonic Acid: a new PEM  

Broader source: Energy.gov [DOE]

"Summary of Case Western?s highly sulfonated polymers research presented to the High Temperature Membrane Working Group Meeting, Orlando FL, October 17, 2003 "

432

Hydrogen Production by Polymer Electrolyte Membrane (PEM)  

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

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists'Montana.ProgramJulietip sheetK-4In 2013Department ofThispurposeFact

433

PEM Electrolysis R&D Webinar  

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 RankCombustion | Department ofT ib l L d F SSales LLCDieselEnergyHistory and SuccessesPBS: Wind

434

Low Temperature PEM Fuel Cell Manufacturing Needs  

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:YearRound-UpHeatMulti-Dimensionalthe10IO1OP001Long-Term StorageDepartment of Energyin a

435

Manufacturing Barriers to High Temperature PEM Commercialization  

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 RankCombustion | Department of Energy Low-TemperatureEnergy Maine09 BalanceStorageReviewFlow of9/2011

436

High Temperature PEM - Energy Innovation Portal  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFun withconfinement plasmas in thein the Assembly of PhotosystemVehicles and

437

Advanced Electrocatalysts for PEM Fuel Cells  

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:YearRound-Up fromDepartment of EnergyAdministrative2 DOE Hydrogen and Fueland Outreach

438

Manufacturing Barriers to High Temperature PEM Commercialization |  

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:Year in3.pdfEnergy HealthComments MEMA: Comments MemoEnergy Managing SwimmingDepartment of

439

Economics of Direct Hydrogen Polymer Electrolyte Membrane Fuel Cell Systems  

SciTech Connect (OSTI)

Battelle's Economic Analysis of PEM Fuel Cell Systems project was initiated in 2003 to evaluate the technology and markets that are near-term and potentially could support the transition to fuel cells in automotive markets. The objective of Battelle?s project was to assist the DOE in developing fuel cell systems for pre-automotive applications by analyzing the technical, economic, and market drivers of direct hydrogen PEM fuel cell adoption. The project was executed over a 6-year period (2003 to 2010) and a variety of analyses were completed in that period. The analyses presented in the final report include: Commercialization scenarios for stationary generation through 2015 (2004); Stakeholder feedback on technology status and performance status of fuel cell systems (2004); Development of manufacturing costs of stationary PEM fuel cell systems for backup power markets (2004); Identification of near-term and mid-term markets for PEM fuel cells (2006); Development of the value proposition and market opportunity of PEM fuel cells in near-term markets by assessing the lifecycle cost of PEM fuel cells as compared to conventional alternatives used in the marketplace and modeling market penetration (2006); Development of the value proposition of PEM fuel cells in government markets (2007); Development of the value proposition and opportunity for large fuel cell system application at data centers and wastewater treatment plants (2008); Update of the manufacturing costs of PEM fuel cells for backup power applications (2009).

Mahadevan, Kathyayani

2011-10-04T23:59:59.000Z

440

Design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. Volume 1. Technical report  

SciTech Connect (OSTI)

This project was Phase I of a multiphased program for the design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. Phase I comprised the conceptual design and associated cost estimates of a stationary Stirling engine capable of being fueled by a variety of heat sources, with emphasis on coal firing, followed by the preparation of a plan for implementing the design, fabrication and testing of a demonstration engine by 1985. The development and evaluation of conceptual designs have been separated into two broad categories: the A designs which represent the present state-of-the-art and which are demonstrable by 1985 with minimum technical risk; and the B designs which involve advanced technology and therefore would require significant research and development prior to demonstration and commercialization, but which may ultimately offer advantages in terms of lower cost, better performance, or higher reliability. The majority of the effort in Phase I was devoted to the A designs.

Not Available,

1980-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Conceptual study of the potential for automotive-derived and free-piston Stirling engines in 30- to 400-kilowatt stationary power applications. Final Report  

SciTech Connect (OSTI)

The technical feasibility of applying automotive-derived kinematic and free-piston Stirling engine concepts for stationary applications was explored. Automotive-derived engines offer cost advantages by providing a mature and developed engine technology base with downrating and parts commonality options for specific applications. Two engine sizes (30 and 400 kW), two Stirling engine configurations (kinematic and free-piston), and two output systems (crankshaft and hydraulic pump) were studied. The study includes the influences of using either hydrogen or helium as the working gas. The first kinematic configuration selects an existing Stirling engine design from an automotive application and adapts it to stationary requirements. A 50,000-hour life requirement was established by downrating the engine to 40 kW and reducing auxiliary loads. Efficiency improvements were gained by selective material and geometric variations and peak brake efficiency of 36.8 percent using helium gas was achieved. The second design was a four-cylinder, 400 kW engine, utilizing a new output drive system known as the z-crank, which provides lower friction losses and variable stroke power control. Three different material and working gas combinations were considered. Brake efficiency levels varied from 40.5 percent to 45.6 percent. A 37.5 kW single-cycle, free-piston hydraulic output design was generated by scaling one cylinder of the original automotive engine and mating it to a counterbalanced reciprocal hydraulic pump. Metallic diaphragms were utilized to transmit power.

Vatsky, A.; Chen, H.S.; Dineen, J.

1982-05-01T23:59:59.000Z

442

Dilaton field minimally coupled to 2+1 gravity; uniqueness of the static Chan-Mann black hole and new dilaton stationary metrics  

SciTech Connect (OSTI)

Using the Schwarzschild coordinate frame for a static cyclic symmetric metric in 2+1 gravity coupled minimally to a dilaton logarithmically depending on the radial coordinate in the presence of an exponential potential, by solving first order linear Einstein equations, the general solution is derived and it is identified with the Chan–Mann dilaton solution. In these coordinates, a new stationary dilaton solution is obtained; it does not allow for a de Sitter–Anti-de Sitter limit at spatial infinity, where its structural functions increase indefinitely. On the other hand, it is horizonless and allows for a naked singularity at the origin of coordinates; moreover, one can identify at a large radial coordinate a (quasi-local) mass parameter and in the whole space a constant angular momentum. Via a general SL(2,R)–transformation, applied on the static cyclic symmetric metric, a family of stationary dilaton solutions has been generated. A particular SL(2,R)–transformation is identified, which gives rise to the rotating Chan–Mann dilaton solution. All the exhibited solutions have been characterized by their quasi-local energy, mass, and momentum through their series expansions at spatial infinity. The algebraic structure of the Ricci–energy-momentum, and Cotton tensors is given explicitly.

García-Diaz, Alberto A. [Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740, 07000 México DF, México. and Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, Apdo. (Mexico)

2014-01-14T23:59:59.000Z

443

PM PEM’s On-Road Investigation – With and Without DPF Equipped Engines  

E-Print Network [OSTI]

Research and Technology’s (CE-CERT) Mobile EmissionsResearch and Technology’s (CE-CERT) Mobile Emissions

Durbin, T; Jung, H; Cocker III, D R; Johnson, K

2009-01-01T23:59:59.000Z

444

PM PEM’s Pre-Measurement Allowance – On-Road Evaluation and Investigation  

E-Print Network [OSTI]

Research and Technology’s (CE-CERT) Mobile EmissionsResearch and Technology’s (CE-CERT) Mobile EmissionsResearch and Technology’s (CE-CERT) Mobile Emissions

Durbin, T; Jung, H; Cocker III, D R; Johnson, K

2009-01-01T23:59:59.000Z

445

PM PEM’s On-Road Investigation – With and Without DPF Equipped Engines  

E-Print Network [OSTI]

catalytic conditions, and thermophoretic losses. With themuch closer thus thermophoretic, diffusion and impactionand thus higher thermophoretic losses. It is unclear if this

Durbin, T; Jung, H; Cocker III, D R; Johnson, K

2009-01-01T23:59:59.000Z

446

PM PEM’s Pre-Measurement Allowance – On-Road Evaluation and Investigation  

E-Print Network [OSTI]

analysis also accounts for thermophoretic losses and sulfateanalysis also accounts for thermophoretic losses and sulfatemuch closer thus thermophoretic, diffusion and impaction

Durbin, T; Jung, H; Cocker III, D R; Johnson, K

2009-01-01T23:59:59.000Z

447

PM PEM’s On-Road Investigation – With and Without DPF Equipped Engines  

E-Print Network [OSTI]

Under the Heavy-Duty Diesel Engine In-Use Testing Program,Emissions from Diesel Engines. 1. Regulated GaseousEmissions from Diesel Engines. 2. Sampling and Toxics and

Durbin, T; Jung, H; Cocker III, D R; Johnson, K

2009-01-01T23:59:59.000Z

448

Features of the adsoprtion of naproxen on the chiral stationary phase (S,S)-Whelk-O1 under reversed-phase conditions  

SciTech Connect (OSTI)

Using elution chromatography, we studied the adsorption mechanism of the Naproxen enantiomers on the chiral stationary phase (S,S)-Whelk-O1, from buffered methanol-water solutions. We propose an adsorption mechanism that assumes monolayer adsorption of the more retained enantiomer and the associative adsorption of the less retained one. The effects of the mobile phase composition on the adsorption of Naproxen are discussed. The combination of an elevated column temperature and of the use of an acidic mobile phase led to the degradation of the column and caused a major loss of its separation ability. The use of a moderately acidic mobile phase at temperature slightly above ambient did not produce rapid severe damages but, nevertheless, hampered the experiments and caused a slow gradual deterioration of the column.

Asnin, Leonid [University of Tennessee, Knoxville (UTK); Gritti, Fabrice [University of Tennessee, Knoxville (UTK); Kaczmarski, Krzysztof [University of Tennessee and Rzeszow University of Technology, Poland; Guiochon, Georges A [ORNL

2010-01-01T23:59:59.000Z

449

Li-Ion Battery with LiFePO4 Cathode and Li4Ti5O12 Anode for Stationary Energy Storage  

SciTech Connect (OSTI)

i-ion batteries based on commercially available LiFePO4 cathode and Li4Ti5O12 anode were investigated for potential stationary energy storage applications. The full cell that operated at flat 1.85V demonstrated stable cycling for 200 cycles followed by a rapid fade. A significant improvement in cycling stability was achieved via Ketjen black coating of the cathode. A Li-ion full cell with Ketjen black modified LiFePO4 cathode and an unmodified Li4Ti5O12 anode exhibited negligible fade after more than 1200 cycles with a capacity of ~130mAh/g. The improved stability, along with its cost-effectiveness, environmentally benignity and safety, make the LiFePO4/ Li4Ti5O12 Li-ion battery a promising option of storing renewable energy.

Wang, Wei; Choi, Daiwon; Yang, Zhenguo

2013-01-01T23:59:59.000Z

450

Design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. First quarterly report  

SciTech Connect (OSTI)

This project is Phase I of a multi-phased program for the design and development of Stirling engines for stationary power generation applications in the 500 to 3000 horsepower range. Phase I comprises the conceptual design and associated cost estimates of a stationary Stirling engine capable of being fueled by a variety of heat sources, with emphasis on coal firing, followed by the preparation of a plan for implementing the design, fabrication and testing of a demonstration engine by 1985. The main effort in Phase I is the generation of state-of-the-art conceptual designs having greatest potential for prototype testing in 1985. The conceptual designs include a heat transport system for integrating the engine heater head with such energy sources as conventional oil/gas combustors, fluidized bed and other coal combustors, and combustors using coal-derived liquid fuels, and low/medium BTU gases. The heat transport systems being investigated include forced convection with gases or liquids, heat pipes, and direct firing. Currently, the leading choice for the solid fuel combustion system is the atmospheric fluidized bed, with low BTU gasification still a viable alternative. Both systems will continue to be evaluated further, but with greater emphasis on FBC. To date, there appears no clear choice among the heat pipe, forced convection gas loop, or direct firing as the prime candidate for the heat transport sub-system. Conceptual design and analysis will continue on all three sub-systems. Scale-up of United Stirling's P-75 engine to serve as the conceptual design of the 500 HP engine module is continuing. (LCL)

Not Available,

1980-01-07T23:59:59.000Z

451

Design and development of Stirling engines for stationary-power-generation applications in the 500- to 3000-hp range. Phase I final report  

SciTech Connect (OSTI)

The first phase of the design and development of Stirling engines for stationary power generation applications in the 373 kW (500 hp) to 2237 kW (3000 hp) range was completed. The tasks in Phase I include conceptual designs of large Stirling cycle stationary engines and program plan for implementing Phases II through V. Four different heater head designs and five different machine designs were prepared in sufficient detail to select a design recommended for development in the near future. A second order analysis was developed for examining the various loss mechanisms in the Stirling engine and for predicting the thermodynamic performance of these engines. The predicted engine thermal brake efficiency excluding combustion efficiency is approximately 42% which exceeds the design objective of 40%. The combustion system designs were prepared for both a clean fuel combustion system and a two-stage atmospheric fluidized bed combustion system. The calculated combustion efficiency of the former is 90% and of the latter is 80%. Heat transport systems, i.e., a heat exchanger for the clean fuel combustion system and a sodium heat pipe system for coal and other nonclean fuel combustion systems were selected. The cost analysis showed that for clean fuels combustion the proposed 2237 kW (3000 hp) system production cost is $478,242 or $214/kW ($159/hp) which is approximately 1.86 times the cost of a comparable size diesel engine. For solid coal combustion the proposed 2237 kW (3000 hp) system production cost is approximately $2,246,242 which corresponds to a cost to power capacity ratio of $1004/kW ($749/hp). The two-stage atmospheric fluidized bed combustion system represents 81% of the total cost; the engine represents 14% depending on the future price differential between coal and conventional clean fuels, a short payback period of the proposed Stirling cycle engine/FBC system may justify the initial cost. (LCL)

None

1980-10-01T23:59:59.000Z

452

Integrated campaign to study the stationary inertial Alfvn wave in the laboratory and space This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network [OSTI]

are in colour only in the electronic version) 1. Introduction The stationary inertial Alfv´en (StIA) wave [1 of StIA waves is magnetic-field-aligned (s-direction in figure 1) electron drift energy that overcomes of the effective phase velocity vector, as shown, and is approximately zero. The StIA wave vector is approximately

California at Berkeley, University of

453

An Assessment of the Near-Term Costs of Hydrogen Refueling Stations and Station Components  

E-Print Network [OSTI]

MCFC Fuel Cell_MCFC Fuel Cell_PAFC Fuel Cell_PEM Fuel Cell_PEM Fuel Cell_PEM Fuel Cell_PEM Fuel Cell_PEM Fuel Cell_PEM Fuel Cell_PEM

Lipman, T E; Weinert, Jonathan X.

2006-01-01T23:59:59.000Z

454

Design and development of Stirling Engines for stationary power generation applications in the 500 to 3000 hp range. Subtask 1A report: state-of-the-art conceptual design  

SciTech Connect (OSTI)

The first portion of the Conceptual Design Study of Stirling Engines for Stationary Power Application in the 500 to 3000 hp range which was aimed at state-of-the-art stationary Stirling engines for a 1985 hardware demonstration is summarized. The main goals of this effort were to obtain reliable cost data for a stationary Stirling engine capable of meeting future needs for total energy/cogeneration sysems and to establish a pragmatic and conservative base design for a first generation hardware. Starting with an extensive screening effort, 4 engine types, i.e., V-type crank engine, radial engine, swashplate engine, and rhombic drive engine, and 3 heat transport systems, i.e., heat pipe, pressurized gas heat transport loop, and direct gas fired system, were selected. After a preliminary layout cycle, the rhombic drive engine was eliminated due to intolerable maintenance difficulties on the push rod seals. V, radial and swashplate engines were taken through a detailed design/layout cycle, to establish all important design features and reliable engine weights. After comparing engine layouts and analyzing qualitative and quantitative evaluation criteria, the V-crank engine was chosen as the candidate for a 1985 hardware demonstration.

None

1980-03-01T23:59:59.000Z

455

Dilution-based emissions sampling from stationary sources: part 2 - gas-fired combustors compared with other fuel-fired systems  

SciTech Connect (OSTI)

With the recent focus on fine particle matter (PM2.5), new, self- consistent data are needed to characterize emissions from combustion sources. Emissions data for gas-fired combustors are presented, using dilution sampling as the reference. The sampling and analysis of the collected particles in the presence of precursor gases, SO{sub 2}, nitrogen oxide, volatile organic compound, and NH{sub 3} is discussed; the results include data from eight gas fired units, including a dual- fuel institutional boiler and a diesel engine powered electricity generator. These data are compared with results in the literature for heavy-duty diesel vehicles and stationary sources using coal or wood as fuels. The results show that the gas-fired combustors have very low PM2.5 mass emission rates in the range of {approximately}10{sup -4} lb/million Btu (MMBTU) compared with the diesel backup generator with particle filter, with {approximately} 5 x 10{sup -3} lb/MMBTU. Even higher mass emission rates are found in coal-fired systems, with rates of {approximately} 0.07 lb/MMBTU for a bag-filter-controlled pilot unit burning eastern bituminous coal. The characterization of PM2.5 chemical composition from the gas-fired units indicates that much of the measured primary particle mass in PM2.5 samples is organic or elemental carbon and, to a much less extent, sulfate. Metal emissions are low compared with the diesel engines and the coal- or wood-fueled combustors. The metals found in the gas- fired combustor particles are low in concentration. The interpretation of the particulate carbon emissions is complicated by the fact that an approximately equal amount of particulate carbon is found on the particle collector and a backup filter. It is likely that measurement artifacts are positively biasing 'true' particulate carbon emissions results. 49 refs., 1 fig., 12 tabs.

England, G.C.; Watson, J.G.; Chow, J.C.; Zielinska, B.; Chang, M.C.O.; Loos, K.R.; Hidy. G.M. [GE Energy, Santa Ana, CA (United States)

2007-01-15T23:59:59.000Z

456

Sandia National Laboratories: stationary ships  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbineredox-activeNational Solar Thermalssls exhibit SSLSstationary ships

457

Durability is one of the most critical remaining issues impeding successful commercialization of broad  

E-Print Network [OSTI]

fuel cells have the potential to replace the vehicle's internal combustion engine. Specifically is the current focus for light-duty vehicles. The durability of fuel cell sys- tems, however, has not been of broad PEM fuel cell stationary and transportation energy applications, and the durability of fuel cell

458

COPYRIGHT 2009 BALLARD POWER SYSTEMS INC. ALL RIGHTS RESERVED BUILDING A CLEAN ENERGY GROWTH COMPANY  

E-Print Network [OSTI]

manufacturing processes that would lower cost; * Courtesy Manhattan Project for Fuel Cell Manufacturing 3 PEM Stack Manufacturing: Cost Overview · The MEA was readily identified as the major cost driver in a 10 kW stationary stack. · The precious metal catalyst electrode is the major cost driver for the MEA

459

May 19-22, 2003 DTE Hydrogen Power Park  

E-Print Network [OSTI]

with electrolysis and stationary PEM fuel cell technology to take advantage of low-cost power during off-peak hours at +5,000 psi (proven, safe, relatively cost effective) 25 ­ 75 kW fuel cell bank (quiet, clean 50 kW Fuel Cell Bank Biomass and/or Central Station power Distribution Grid Vehicle refueling station

460

Hydrogen Storage Workshop Argonne National Laboratory  

E-Print Network [OSTI]

hydrogen, fuel cells, and distribution..." #12;1. Hydrogen Storage 2. Hydrogen Production 3. Fuel Cell Cost barriers Assist Suppliers Independent T&E Advanced Concepts Analysis & Modeling SUPPLIERS PEM fuel cell, Stationary Fuel Cells 5,440 5,500 7,500 2,000 (+36%) HYDROGEN RESEARCH Core Research and Development 14

Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

FUEL CELL TECHNOLOGIES PROGRAM Hydrogen and Fuel  

E-Print Network [OSTI]

collectors. In a Polymer Electrolyte Membrane (PEM) fuel cell, which is widely regarded as the most promisingFUEL CELL TECHNOLOGIES PROGRAM Hydrogen and Fuel Cell Technologies Program: Fuel Cells Fuel Cells -- is the key to making it happen. Stationary fuel cells can be used for backup power, power for remote loca

462

Water Management EC Kumbur and MM Mench, The Pennsylvania State University, University Park, PA, USA  

E-Print Network [OSTI]

, hydrogen-based proton-exchange membrane fuel cells (PEMFCs) are the most suited for many stationary power fuel cell (PEMFC) assembly and components. CL, catalyst layer; DM, diffusion medium, PEM, polymer, USA & 2009 Elsevier B.V. All rights reserved. Introduction Fuel cells hold great promise to meet

Mench, Matthew M.

463

Thse prpare l'Institut FEMTO-ST (Dpartement Energie, UMR CNRS 6174) dans le cadre de la Fdration de Recherche FC LAB (FR CNRS 3539) et en cotutelle avec l'Universit de Cocody-Abidjan, Cte d'Ivoire  

E-Print Network [OSTI]

. A stand alone multi-source system based on the coupling of photovoltaic energy and both a PEM electrolyser and a PEMFC for stationary application is studied. The system gathers photovoltaic array as main energy source one to another one, the energetic system sizing is performed according to a household power profile

464

A HYBRID ADSORBENT-MEMBRANE REACTOR (HAMR) SYSTEM FOR HYDROGEN PRODUCTION  

E-Print Network [OSTI]

hydrogen production for proton exchange membrane (PEM) fuel cells for various mobile and stationaryA HYBRID ADSORBENT-MEMBRANE REACTOR (HAMR) SYSTEM FOR HYDROGEN PRODUCTION A. Harale, H. Hwang, P recently our focus has been on new HAMR systems for hydrogen production, of potential interest to pure

Southern California, University of

465

Surface modified stainless steels for PEM fuel cell bipolar plates  

DOE Patents [OSTI]

A nitridation treated stainless steel article (such as a bipolar plate for a proton exchange membrane fuel cell) having lower interfacial contact electrical resistance and better corrosion resistance than an untreated stainless steel article is disclosed. The treated stainless steel article has a surface layer including nitrogen-modified chromium-base oxide and precipitates of chromium nitride formed during nitridation wherein oxygen is present in the surface layer at a greater concentration than nitrogen. The surface layer may further include precipitates of titanium nitride and/or aluminum oxide. The surface layer in the treated article is chemically heterogeneous surface rather than a uniform or semi-uniform surface layer exclusively rich in chromium, titanium or aluminum. The precipitates of titanium nitride and/or aluminum oxide are formed by the nitriding treatment wherein titanium and/or aluminum in the stainless steel are segregated to the surface layer in forms that exhibit a low contact resistance and good corrosion resistance.

Brady, Michael P [Oak Ridge, TN; Wang, Heli [Littleton, CO; Turner, John A [Littleton, CO

2007-07-24T23:59:59.000Z

466

Validation Testing for the PM-PEMS Measurement Allowance Program  

E-Print Network [OSTI]

directly off of 12 VDC batteries and did not need AC powerwas installed to keep the batteries charged. All compressed

Johnson, K; Durbin, T; Jung, H; Cocker III, D R; Khan, M Y

2010-01-01T23:59:59.000Z

467

Membrane Durability in PEM Fuel Cells: Chemical Degradation  

Broader source: Energy.gov [DOE]

Presentation at the 2008 High Temperature Membrane Working Group Meeting held June 9, 2008, in Washington, DC

468

Hydrogen Production by Polymer Electrolyte Membrane (PEM)Electrolysis...  

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

on Giner and Proton Presentation slides and speaker biographies from the DOE Fuel Cell Technologies Office webinar "Hydrogen Production by Polymer Electrolyte Membrane...

469

Webinar: Hydrogen Production by PEM Electrolysis-Spotlight on...  

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

on Giner and Proton Presentation slides and speaker biographies from the DOE Fuel Cell Technologies Office webinar "Hydrogen Production by Polymer Electrolyte Membrane...

470

Improved Membrane Materials for PEM Fuel Cell Application  

SciTech Connect (OSTI)

The overall goal of this project is to collect and integrate critical structure/property information in order to develop methods that lead to significant improvements in the durability and performance of polymer electrolyte membrane fuel cell (PEMFC) materials. This project is focused on the fundamental improvement of PEMFC membrane materials with respect to chemical, mechanical and morphological durability as well as the development of new inorganically-modified membranes.

Kenneth A. Mauritz; Robert B. Moore

2008-06-30T23:59:59.000Z

471

Low Cost PEM Fuel Cell Metal Bipolar Plates  

SciTech Connect (OSTI)

Bipolar plate is an important component in fuel cell stacks and accounts for more than 75% of stack weight and volume. The technology development of metal bipolar plates can effectively reduce the fuel cells stack weight and volume over 50%. The challenge is the metal plate corrosion protection at low cost for the broad commercial applications. This project is aimed to develop innovative technological solutions to overcome the corrosion barrier of low cost metal plates. The feasibility of has been demonstrated and patented (US Patent 7,309,540). The plan is to further reduce the cost, and scale up the technology. The project is built on three pillars: 1) robust experimental evidence demonstrating the feasibility of our technology, 2) a team that consists of industrial leaders in fuel cell stack application, design, and manufactures; 3) a low-risk, significant-milestone driven program that proves the feasibility of meeting program objectives The implementation of this project will reduce the fuel cell stack metal bipolar separator plate cost which accounts 15-21% of the overall stack cost. It will contribute to the market adoption of fuel cell technologies. In addition, this corrosion protection technology can be used similar energy devices, such as batteries and electrolyzers. Therefore, the success of the project will be benefit in broad markets.

Wang, Conghua [TreadStone Technologies, Inc.

2013-05-30T23:59:59.000Z

472

Higher Temperature PEM Composite Systems for Fuel Cells  

Broader source: Energy.gov [DOE]

Presentation by Virginia Polytechnic Institute and State University to the High Temperature Membrane Working Group Meeting held in Honolulu, Hawaii October 8, 2004.

473

Design Considerations for a PEM Fuel Cell Powered Truck APU  

E-Print Network [OSTI]

of most line-haul class 8 trucks. Ballard Nexa Fuel Cell Thefuel cell powered auxiliary power units (APUs) to reduce idling in line-haul trucks.

Grupp, David J; Forrest, Matthew E.; Mader, Pippin G.; Brodrick, Christie-Joy; Miller, Marshall; Dwyer, Harry A.

2004-01-01T23:59:59.000Z

474

Three-wheel air turbocompressor for PEM fuel cell systems  

DOE Patents [OSTI]

A fuel cell system comprises a compressor and a fuel processor downstream of the compressor. A fuel cell stack is in communication with the fuel processor and compressor. A combustor is downstream of the fuel cell stack. First and second turbines are downstream of the fuel processor and in parallel flow communication with one another. A distribution valve is in communication with the first and second turbines. The first and second turbines are mechanically engaged to the compressor. A bypass valve is intermediate the compressor and the second turbine, with the bypass valve enabling a compressed gas from the compressor to bypass the fuel processor.

Rehg, Tim; Gee, Mark; Emerson, Terence P.; Ferrall, Joe; Sokolov, Pavel

2003-08-19T23:59:59.000Z

475

Degradation of Ionic Pathway in PEM Fuel Cell Cathode  

SciTech Connect (OSTI)

The degradation of the ionic pathway throughout the catalyst layer in proton exchange membrane fuel cells was studied under an accelerated stress test of catalyst support (potential hold at 1.2 V). Electrochemical behaviors of the cathode based on graphitic mesoporous carbon supported Pt catalyst were examined using electrochemical impedance spectroscopy and cyclic voltammetry. Impedance data were plotted and expressed in the complex capacitance form to determine useful parameters in the transmission line model: the double-layer capacitance, peak frequency, and ionic resistance. Electrochemical surface area and hydrogen crossover current through the membrane were estimated from cyclic voltammogram, while cathode Faradaic resistance was compared with ionic resistance as a function of test time. It was observed that during an accelerated stress test of catalyst support, graphitic mesoporous carbon becomes hydrophilic which increases interfacial area between the ionomer and the catalyst up to 100 h. However, the ionic resistance in the catalyst layer drastically increases after 100 h with further carbon support oxidation. The underlying mechanism has been studied and it was found that significant degradation of ionic pathway throughout the catalyst layer due to catalyst support corrosion induces uneven hydration and mechanical stress in the ionomer.

Park, Seh Kyu; Shao, Yuyan; Wan, Haiying; Viswanathan, Vilayanur V.; Towne, Silas A.; Rieke, Peter C.; Liu, Jun; Wang, Yong

2011-11-12T23:59:59.000Z

476

Higher Temperature PEM Composite Systems for Fuel Cells  

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

M.L. Hill, H. Ghassemi, W.Harrison, B. Einsla, X Li, J. Yang, M Sankir and K. Wiles Chemistry Dept & Macromolecules and Interfaces Institute Virginia Polytechnic Institute and...

477

Progress and Challenges for PEM Transit Fleet Applications  

E-Print Network [OSTI]

. #12;· Brief company history in area of fuel cell buses · Current fuel cell bus deployments commercialization of fuel cell buses · Fuel cell bus R&D needs · Future plans Agenda 2 #12;UTC Fleet history · 14+ yr experience integrating fuel cell technology into buses SunLine, AC Transit, LAMTA, Chula Vista 30

478

Micro-Structural Mitigation Strategies for PEM Fuel Cells  

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 RankCombustion | Department of EnergyDevelopmentTechnologies |CharlesDepartmentMichiganEnergy BALLARD

479

PEM Electrolyzer Incorporating an Advanced Low Cost Membrane  

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

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480

PEM Fuel Cell Technology, Key Research Needs and Approaches (Presentation)  

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

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Note: This page contains sample records for the topic "hogen pem stationary" from the National Library of EnergyBeta (NLEBeta).
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481

Advanced Cathode Catalysts and Supports for PEM Fuel Cells  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustionImprovement3-- ------------------------------Chapter 39.208-006 Advance

482

PEM Electrolyzer Incorporating an Advanced Low Cost Membrane | 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:Year in3.pdfEnergyDepartment ofOil's Impact on OurSempriusEnergy PART 708 --of Energy

483

PEM Stack Manufacturing: Industry Status | 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:Year in3.pdfEnergyDepartment ofOil's Impact on OurSempriusEnergy PART 708 --of

484

Degradation of Ionic Pathway in PEM Fuel Cell Cathode. | EMSL  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed Newcatalyst phasesData Files Data Files 1B&W Y-12studies inB Sign InRDegradation

485

Low Cost Manufacturable Microchannel Systems for Passive PEM Water  

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:YearRound-UpHeatMulti-Dimensionalthe10IO1OP001Long-Term Storage of Cesium1940sofof10Management |

486

Low-Cost Manufacturable Microchannel Systems for Passive PEM Water  

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:YearRound-UpHeatMulti-Dimensionalthe10IO1OP001Long-Termpaul_fini@cree.com CREE

487

Dedicated to The Continued Education, Training and Demonstration of PEM  

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:YearRound-UpHeat Pump Models | Department1 Prepared by:DTEMoab3 SEABDecommissioningFuel Cell

488

Progress and Challenges for PEM Transit Fleet Applications | Department of  

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 RankCombustion | Department ofT ib l L d FNEPA/309Department ofDepartment ofProgram

489

Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold  

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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: VegetationEquipment Surfaces and InterfacesAdministration -Lowell L.FallU . SChromatography

490

Water Transport in PEM Fuel Cells: Advanced Modeling, Material Selection,  

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 RankCombustion |Energy Usage »of| Department ofDepartment of Energy Watch it LiveOctoberDepartment

491

Water Transport in PEM Fuel Cells: Advanced Modeling, Material Selection,  

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 RankCombustion |Energy Usage »of| Department ofDepartment of Energy Watch it

492

High Pressure PEM Electrolysis: Status, Key Issues, and Challenges  

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:YearRound-UpHeatMulti-Dimensional Subject:Ground Hawaii HIGH PERFORMANCE and SUSTAINABLEIssuesHigh

493

Hydrogen Production by PEM Electrolysis: Spotlight on Giner and Proton  

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:YearRound-UpHeatMulti-Dimensional Subject:GroundtoProduction Technical Team Roadmap June

494

Advanced Electrocatalysts for PEM Fuel Cells | 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:Year in Review: Top Five EERE Blog Posts1-034 Advance Patent WaiverLeslie Pezzullo

495

Next Generation Bipolar Plates for Automotive PEM Fuel Cells | 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 RankCombustion | Department ofT ib l L d F S iPartnership Program |MillionNext Generation Attics and Roofof

496

HIGH DETAIL STATIONARY OPTIMIZATION MODELS FOR GAS ...  

E-Print Network [OSTI]

the coefficients of isobaric molar heat capacity A, B, C) consist of four ..... Had (kJ kg?1), required compressor power P (MW) and compressor outflow tem-.

2014-11-26T23:59:59.000Z

497

Online Learning of Non-stationary Sequences  

E-Print Network [OSTI]

We consider an online learning scenario in which the learner can make predictions on the basis of a fixed set of experts. The performance of each expert may change over time in a manner unknown to the learner. We formulate ...

Monteleoni, Claire

2003-06-12T23:59:59.000Z

498

Approximating Stationary Points of Stochastic Mathematical ...  

E-Print Network [OSTI]

Aug 25, 2010 ... In this paper we consider the following stochastic mathematical ...... H. Xu and M. Fukushima, Monte Carlo and quasi-Monte Carlo sam-.

2010-08-25T23:59:59.000Z

499

Algorithms for optimizing Placement of Stationary Monitors  

E-Print Network [OSTI]

(The terms “monitors” and “sensors” can be used interchangeably, although we .... An adversary can enter the area at any node (1,j) in the first column. ...... objective function is not ascending in our search direction at a stepsize of µ, and µ is ...

2012-10-24T23:59:59.000Z

500

Transportation and Stationary Power Integration: Workshop Proceedings |  

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 RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7 thFuel27, 2008, Phoenix,Technology