Wattana, Wassachol

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Wattana, Wassachol
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wassachol.wa@kmitl.ac.th

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    Item type:Publication,
    Influence of non-straight parallel channel designs on performance of planar SOFC
    (2009-12-01)
    Wattana, Wassachol
    ;
    Charoensuk, Jarruwat
    ;
    Charojrochkul, Sumittra
    The 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.
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    Item type:Publication,
    Characterization of Mixed Biomass Pellet Made from Oil Palm and Para-rubber Tree Residues
    (2017-01-01)
    Wattana, Wassachol
    ;
    Phetklung, Siwimon
    ;
    Jakaew, Watcharakit
    ;
    Chumuthai, Songamorn
    ;
    Sriam, Phurinut
    In this study, the potential of the important economic crops of Southern Thailand for pellet making was utilized. The biomass pellets were prepared from oil palm leaves (PL) and frond (PF), para-rubber leaves litter (PAL) and branch (PB) and their blend (mixing of 50 wt.% of two materials). The raw materials which collected from local plantation were cleaned, dried and milled into small particles less than 1 mm and then continued with pellet forming by a single unit press in a laboratory under the temperature and pressure of 130°C and 350 psi. Some characteristics were analyzed to evaluate quality of pellet, i.e. moisture content, density, ash content, calorific value. Moreover, the combustion behavior was investigated by means of thermogravimetry analysis. The lowest ash content of 2.27% and 2.82% were received from PB in case of pure pellet and PB+PAL in case of mixed pellets, respectively. The calorific values of pure pellets were 16.05, 17.68, 18.71 and 19.64 MJ/kg for PF, PL, PB and PAL, respectively. The combustion characteristics were exhibited in the ignition and burnout temperature, which drawn from TG curved. The burnout temperature was improved with higher in all cases of mixed biomass pellet. The characteristics of mixed biomass pellets differed from pure biomass pellets which contribute to the further improve its quality.
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    Item type:Publication,
    Non-reacting flow distributions under various SOFC stack configurations
    (2007-12-01)
    Wattana, Wassachol
    ;
    Charoensuk, Jarruwat
    ;
    Phoocharoen, Niwat
    ;
    Charojrochkul, Sumittra
    A 3-dimensional Computational Fluid Dynamics (CFD) model for fuel cell stack simulations has been developed using STAR-CD with effect of buoyancy force. A flow distribution in a planar fuel cell stack with straight gas channels is considered with variation in gas feeding directions. Any electrochemical interaction is neglected. Eight flow configurations comprising of three parameters were investigated, i.e.; i) vertical and horizontal orientations of the cell stack, ii) U-shape and Z-shape flow patterns, and iii) upward and downward feeding directions. For these configurations, the velocity distributions across the stack were compared. The better flow distribution was observed for air with U-shape flow pattern and upward feeding. For fuel side, the flow with U-shape downward yields a relatively better flow distribution. Moreover, the results indicate that the effect of feeding direction is small in the stack with Z-shape flow. © The Electrochemical Society.