The Experts below are selected from a list of 23274 Experts worldwide ranked by ideXlab platform
Junbom Kim - One of the best experts on this subject based on the ideXlab platform.
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Study of external humidification method in proton exchange membrane Fuel Cell
Journal of Power Sources, 2004Co-Authors: Duksu Hyun, Junbom KimAbstract:Abstract Water management is essential for performance enhancement of a PEMFC because proton conductivity depends on hydration of the polymer. An external humidification method is used in a Fuel Cell experiment. Humidity and temperature of the gas are measured using humidity and a dew-point transmitter. An E-tek electrode and a Nafion 115 membrane was used to check the relationship between humidity and performance of a Fuel Cell. The Fuel Cell performance experiment was carried out using a control program that is made in laboratory using HP VEE. Humidity data on the steady state was used to understand the effect of humidity on Fuel Cell performance. An experiment was performed to improve Fuel Cell Efficiency at lower humidity and temperature condition. The relative humidity of hydrogen gas was lower by about 10–15% than that of air or oxygen but the temperature was higher by about 2.5 °C.
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Study of external humidification method in proton exchange membrane Fuel Cell
Journal of Power Sources, 2004Co-Authors: Duksu Hyun, Junbom KimAbstract:Abstract Water management is essential for performance enhancement of a PEMFC because proton conductivity depends on hydration of the polymer. An external humidification method is used in a Fuel Cell experiment. Humidity and temperature of the gas are measured using humidity and a dew-point transmitter. An E-tek electrode and a Nafion 115 membrane was used to check the relationship between humidity and performance of a Fuel Cell. The Fuel Cell performance experiment was carried out using a control program that is made in laboratory using HP VEE. Humidity data on the steady state was used to understand the effect of humidity on Fuel Cell performance. An experiment was performed to improve Fuel Cell Efficiency at lower humidity and temperature condition. The relative humidity of hydrogen gas was lower by about 10–15% than that of air or oxygen but the temperature was higher by about 2.5 °C.
Gianfranco Digiuseppe - One of the best experts on this subject based on the ideXlab platform.
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Fuel sensitivity tests in tubular solid oxide Fuel Cells
Journal of Power Sources, 2004Co-Authors: Srikanth Gopalan, Gianfranco DigiuseppeAbstract:Abstract Fuel sensitivity experiments form an important feature of testing solid oxide Fuel Cell systems. In this paper we describe a Fuel sensitivity test and its relation to Fuel utilization. The sensitivity of the measured terminal voltage of a tubular solid oxide Fuel Cell to the Fuel utilization provides important information about ‘leaks’ through the Cell. Such leaks could arise from pinholes in the electrolyte or from other sources. First a simple analytical model is presented which is then refined using a numerical simulation. Such tests also provide a methodology to quantify the leaks present in the Cell which can ultimately have an effect on Fuel Cell Efficiency.
Sunghyun Kim - One of the best experts on this subject based on the ideXlab platform.
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effect of initial carbon sources on the performance of microbial Fuel Cells containing proteus vulgaris
Biotechnology and Bioengineering, 2000Co-Authors: Namjoon Kim, Youngjin Choi, Seunho Jung, Sunghyun KimAbstract:Mediator-coupled microbial Fuel Cells containing Proteus vulgaris were constructed and the Cell performance was tested. Fuel Cell Efficiency depended on the carbon source in the initial medium of the microorganism. Maltose and trehalose were not utilized substantially by P. vulgaris; however, their presence in the initial medium resulted in enhanced Cell performance. In particular, galactose showed 63% coulombic Efficiency in a bioFuel Cell after P. vulgaris was cultured in a trehalose-containing medium. This work demonstrates that optimum utilization of carbon sources by microorganisms, which leads to the maximization of Fuel Cell performance, is possible simply by adjusting initial carbon sources. © 2000 John Wiley & Sons, Inc. Biotechnol Bioeng 70: 109–114, 2000.
Duksu Hyun - One of the best experts on this subject based on the ideXlab platform.
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Study of external humidification method in proton exchange membrane Fuel Cell
Journal of Power Sources, 2004Co-Authors: Duksu Hyun, Junbom KimAbstract:Abstract Water management is essential for performance enhancement of a PEMFC because proton conductivity depends on hydration of the polymer. An external humidification method is used in a Fuel Cell experiment. Humidity and temperature of the gas are measured using humidity and a dew-point transmitter. An E-tek electrode and a Nafion 115 membrane was used to check the relationship between humidity and performance of a Fuel Cell. The Fuel Cell performance experiment was carried out using a control program that is made in laboratory using HP VEE. Humidity data on the steady state was used to understand the effect of humidity on Fuel Cell performance. An experiment was performed to improve Fuel Cell Efficiency at lower humidity and temperature condition. The relative humidity of hydrogen gas was lower by about 10–15% than that of air or oxygen but the temperature was higher by about 2.5 °C.
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Study of external humidification method in proton exchange membrane Fuel Cell
Journal of Power Sources, 2004Co-Authors: Duksu Hyun, Junbom KimAbstract:Abstract Water management is essential for performance enhancement of a PEMFC because proton conductivity depends on hydration of the polymer. An external humidification method is used in a Fuel Cell experiment. Humidity and temperature of the gas are measured using humidity and a dew-point transmitter. An E-tek electrode and a Nafion 115 membrane was used to check the relationship between humidity and performance of a Fuel Cell. The Fuel Cell performance experiment was carried out using a control program that is made in laboratory using HP VEE. Humidity data on the steady state was used to understand the effect of humidity on Fuel Cell performance. An experiment was performed to improve Fuel Cell Efficiency at lower humidity and temperature condition. The relative humidity of hydrogen gas was lower by about 10–15% than that of air or oxygen but the temperature was higher by about 2.5 °C.
Frano Barbir - One of the best experts on this subject based on the ideXlab platform.
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WITHDRAWN: Fuel Cell Efficiency at peak power is a meaningless parameter
Journal of Power Sources, 2011Co-Authors: Frano BarbirAbstract:This article has been withdrawn at the request of the Author and Editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy
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Efficiency and economics of proton exchange membrane pem Fuel Cells
International Journal of Hydrogen Energy, 1997Co-Authors: Frano Barbir, T GomezAbstract:Abstract There is a strong relationship between the Efficiency and economics of Proton Exchange Membrane (PEM) Fuel Cells. The Fuel Cell Efficiency is not a single number; it is a function of power density at which the Fuel Cell is operating. Typically, the lowest Efficiency is achieved at maximum power output. The optimum nominal Efficiency that results in the least expensive electricity produced by the Fuel Cell is determined not only by the Fuel Cell performance characteristics, but also by its economics, i.e. capital cost of Fuel Cell and cost of hydrogen. The Efficiency and economics of the Fuel Cells have been analyzed in various load profiles and for various development and cost scenarios. The results indicate that in the best case scenario the Fuel Cells can be produced at ~$100/kW, operate at 50% Efficiency, and generate electricity at
