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Modélisations et comparaison thermo-énergétique de systèmes de cogénération

Abstract : The objectives of this thesis relates to the energy management in the systems of production Combined of Heat and Power (CHP , cogeneration) fed by natural gas. Initially, after a state of the art of the coefficients of exchange and correlations of frictions, a model a zone with against-buckles ideal is carried out. A study of sensitivity releases a parameter of adjustment interesting for the cogeneration whose influence is revealed in a finer model with against-buckles improved (predictive), validated in experiments, which provided the electric and thermal production of the engine. A generic curve [ Efficiency; Power ] is highlighted, by each one of these models, it puts forward, through the number of revolutions of the engine, two optimal modes one of efficiency and one of power as well as an optimal operating range. In the second time one carries out a comparison of the principal systems of cogeneration: Internal combustion engines (ICE), Gas Turbines engine (GTE) and Fuel cells (FC) requiring a more analytical approach. The whole of these systems is modelled, with a preoccupation of a coherence, according to two principal constraints; the energy expenditure and the maximum temperature of the thermodynamic cycle corresponding. These models are able to envisage the production of Power (electric) and Heat and allow an energy, exergetic analysis and study of sensitivity to the principal parameters of design and adjustments. It will be noted that the ICE follow a general dual cycle with an unspecified distribution of combustions which the modelling of GTE presents three configurations of exchangers including two new and which the heating of the reagents is taken into account at the time of the modelling of FC.
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Damien Descieux. Modélisations et comparaison thermo-énergétique de systèmes de cogénération. Sciences de l'ingénieur [physics]. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10092⟩. ⟨tel-01748267⟩



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