1,720,962 research outputs found
Parametric analysis of the endogenous and exogenous sources of irreversibility in a tubular solid oxide fuel trhough finite-volume analysis
No full textSimulation of a tubular solid oxide fuel cell through fnite volume analysis: effects of the radiative heat transfer and exergy analysis
No full textThis paper presents a very detailed finite volume axial-symmetric model of a tubular internal reforming Solid Oxide Fuel Cells (SOFC), in which the effects of heat/mass transfer and chemical/electrochemical reactions are included. The model allows one to predict the performance of a single SOFC tube once a series of design and operative parameters are fixed, but also to investigate the source and localization of inefficiency. To this scope, an exergy analysis was implemented.
The SOFC tube is discretized along its longitudinal axis. Detailed models of the kinetics of the shift and reforming reactions, pressure drops, convection heat transfer and overvoltages are introduced, also based on the work previously developed by the authors. The heat transfer model includes the contribution of thermal radiation, so improving the models previously used by the authors. Radiative heat transfer is calculated on the basis of the slice-to-slice configuration factors and corresponding radiosities. Results showed that radiation is very significant for these types of Fuel Cells. The results of the simulation model are also employed in order to verify the correctness of some simplifying assumption diffusely adopted in literature.
Based on this simulation model, a case study is presented and discussed. For a fixed set of design and operation parameters, the values of temperature, pressure, chemical composition, electrical parameters and exergy destruction rates are evaluated for each slice of the SOFC tube under investigation.
A sensitivity analysis is also performed, in order to investigate the influence of the design parameters on the energetic and exergetic performance of the system
An investigation on the irreversibilities in a tubular sofc stack through a finite-volume axial-symmetric model
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Experimental analysis of micro-tubular SOFC fed by hydrogen
No full textThis paper analyzes the thermodynamic and electrochemical performance of an anode supported micro-tubular Solid Oxide Fuel Cell (SOFC) fed by hydrogen. The micro-tubular SOFC used is anode supported, consisting of a NiO and Gd0.2Ce0.8O2-x (GDC) cermet anode, thin GDC electrolyte, and a La0.6Sr0.4Co0.2Fe0.8O3-y (LSCF) and GDC cermet cathode. The fabrication of the cells under investigation are described, and an analysis of the different procedures with emphasis of the innovations with respect to traditional techniques. Such micro-tubular cells were tested using a Test Stand consisting of: a vertical tubular furnace, an electrical load, a galvanostast, gas pipelines, temperature, pressure and flow meters. The tests on the micro-SOFC were performed using hydrogen, to determine the cell polarization. A parametric study is also presented with the scope to analyze the variations of the thermodynamic and electrochemical performances of the cell in function of its operating temperature and fuel flow
Analisi sperimentale delle prestazioni di un modulo micro-cogenerativo basato su cella a combustibile ad ossidi solidi.
No full textAnalisi energetica, economica ed ambientale di un impianto di trattamento del percolato da discarica
No full textA finite-volume simulation model of a tubular solid oxide fuel cell and its pre-reformer
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