Charoensuk, Jarruwat
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Charoensuk, Jarruwat
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Charoensuk, J.
Charoensuk, Jaruwat
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jarruwat.ch@kmitl.ac.th
6 results
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Item type:Publication, Numerical simulation of metal-supported solid oxide fuel cell (mSOFC)(2009-12-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Behaviour of various glass seal for planar solid oxide fuel cell(2008-01-01); Charojrochkul, S.One of the critical issues in designing a planar solid oxide fuel cell (SOFC) is the development of materials to hermetically seal the metal (430 series stainless steel) or ceramic interconnector with the ceramic electrolyte of the cell. The main objective of this sealing material is to achieve a low leak rate, long-term stability at operating temperature and chemical compatibility with other components. One of the compositions has been operated in an SOFC in excess of 30 minutes over the range of 600, 700, 800, and 900°C. The seal is a composition of polymer blend and glass of 1:3, 1:1 and 3:1 by weight. The leakage rate of each seal was measured simultaneously under the compressive force of 100 N, 2 bar Helium. The seal was characterized using a thermogravimetric analysis. The effect of glass composition on operating temperature and compressive forces on the leakage rate have been discussed and correlated. © 2008 Trans Tech Publications, Switzerland. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of non-straight parallel channel designs on performance of planar SOFC(2009-12-01); ; Charojrochkul, SumittraThe flow aerodynamic and friction loss which are usually considered for heat exchanger design are adapted for a channel design for solid oxide fuel cell stack. In this study the design concept is limited to a parallel configuration because of its simplicity. Heat and mass transfer rate can be improved by an introduction of the non-straight parallel channel design yielding higher fuel cell performance. In this paper, a three-dimensional computational model of SOFCs with non-straight parallel channel has been constructed using computational aided engineering tool, FLUENT. The aim of this work is to investigate the cell performance associated with underlying transport phenomena of different channel configurations by looking at distributions of velocity, pressure, hydrogen and oxygen concentrations and current density of each channel design. The influence of each flow channel design (serpentine-parallel, zigzag-parallel and wavy-parallel) on cell performance in SOFCs is discussed. The results indicate that the most enhanced cell performance, especially at high current density, is achieved by using a serpentine-parallel channel design with a trade-off on its greater pressure drop. Copyright © 2009 by ASME. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Non-reacting flow distributions under various SOFC stack configurations(2007-12-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Improved electrical conducting wires for SOFCs(2008-01-01); Charojrochkul, S.Solid Oxide Fuel Cells (SOFCs) have attracted a number of researchers due to their efficiency as alternative energy devices. Studies have been conducted to investigate different components of the SOFCs to improve the performances. Current collecting wires are the components which have affected the overall performance. Since SOFCs are normally operated in the temperature range of 700-1000 °C in dual atmospheres, the wiring material must be able to function at this condition. Currently, the material used to make the wires is platinum because of its high electrical conductivity, high melting point and oxidation resistant. However, platinum is expensive, especially for the practical operation of SOFCs. Silver could be an alternative choice due to its very high electrical conductivity. Nevertheless, the melting point of silver is rather low (900-960 °C). In our study, a modified silver current collecting wire has been used in the temperature range of 100-1000 °C. Their conductivity curves have demonstrated higher performances in comparison with the systems employing Pt and gold wires. In addition, the cost is reduced approximately 800-1000 times from that of the traditional material used. © 2008 Trans Tech Publications, Switzerland. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modified sulfation model for simulation of pulverized coal combustion(2006-02-01); Fungtammasan, B.This work deals with the development of mathematical techniques for incorporating existing sulfation models into a CFD code for simulation of the flow and heat and mass transfer in multi-phase reacting flow; i.e. in the combustion of pulverized coal with the dry type sulfur absorption process. By compromising the ability to maintain some features of the sulfation, as suggested in literatures with computation time, the model was successfully embedded into FAFNIR, a CFD code by Lockwood et al. and has been used for prediction of SO<inf>2</inf> absorption in pulverized coal combustion to compare with experimental data at various conditions. This paper focuses on mathematical representation of the sulfation process by including the effects of temperature on the reaction rate at zero sulfation and during increased sulfate loading or accumulation of product layers. The model is relatively simple and is applicable over a wide range of temperatures, particle sizes and SO <inf>2</inf> concentrations. Validation was performed and it was found that the model satisfactorily represents the amount of accumulated sulfate within the entire domain of calculation. © 2005 Elsevier Ltd. All rights reserved.