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Energy

Alternative energy

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Displaying 376 - 384 of 384

Measured Performance of Three Residential Fuel Cell Systems

April 29, 2008
Author(s)
Mark W. Davis
Under a program to develop a consumer-oriented rating methodology for residential cogeneration fuel cells, the performance of three systems was characterized in the NIST Residential Fuel Cell Test Facility. These systems differed with respect to the type

Current Status of Thermodynamic Properties of Hydrogen

August 17, 2007
Author(s)
Bryce Jacobson, Jacob W. Leachman, Steven Penoncello, Eric Lemmon
This paper presents a survey of the thermodynamic properties of normal hydrogen and parahydrogen with comparisons of properties calculated using the standard models to available experimental data. Motivated by the fact that the currently accepted standards

In-Situ Investigation of Water Transport in an Operating PEM Fuel Cell Using Neutron Radiography: Part 2 - Transient Water Accumulation in an Interdigitated Cathode Flow Field

July 27, 2007
Author(s)
Jon P. Owejan, T Trabold, David L. Jacobson, D Baker, Daniel S. Hussey, Muhammad D. Arif
An interdigitated cathode flow field was tested in-situ with neutron radiography to measure the water transport through the porous gas diffusion layer in a PEM fuel cell. Constant current density to open circuit cycles were tested and the resulting liquid

Neutron Images of the Through-Plane Water Distribution of an Operating PEM Fuel Cell

July 27, 2007
Author(s)
Daniel S. Hussey, David L. Jacobson, Muhammad Arif, Jon P. Owejan, Jeffrey J. Gagliardo, T Trabold
Neutron imaging has proven an invaluable tool for water metrology in operating proton exchange membrane fuel cells. Due to limitations in scintillator-based detector resolution, neutron imaging has been applied only to assessing the in-plane water

Voltage Instability in a Simulated Fuel Cell Stack Correlated to Cathode Water Accumulation

July 22, 2007
Author(s)
Jon P. Owejan, T Trabold, Jeffrey J. Gagliardo, Robert N. Carter, Daniel S. Hussey, David L. Jacobson, Muhammad D. Arif
Single fuel cells running independently are often used for fundamental studies of water transport. It is also necessary to assess the dynamic behavior of fuel cell stacks comprised of multiple cells arranged in series, thus providing many paths for flow of

PEM Fuel Cell Membrane Hydration Measurement by Neutron Imaging

November 8, 2006
Author(s)
D J. Ludlow, M K. Jensen, C M. Calebrese, G A. Eisman, S Yu, C Dannehy, Daniel S. Hussey
Neutron scattering experiments on a proton exchange membrane fuel cell wereperformed to assess the ability to quantify water in the membrane and electrode/gas diffusion layers. Previous studies have shown that liquid water is easily resolved within flow
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