6533b82ffe1ef96bd1296272

RESEARCH PRODUCT

Optimisation d’un capteur solaire double passe à air et estimation des échanges de chaleur paroi-fluide.

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In this work, we present a study of the performance of a double pass flat solar collector for the production of hot air to supply and improve drying techniques. The cases of an absorber with and without fins are analyzed.Theoretical models for the double pass solar collector with and without fins have been established and solved numerically using codes developed in Fortran to obtain a global approach. Comsol Multi-physics code is used for a more local study. An experimental device has been designed to validate the results obtained numerically. One of the particularities of the solar collector developed in the laboratory is its insulation system. For this, a local bio-sourced material composed of crushed millet stems has been developed to increase the performance of the solar collector. The properties of the bio-sourced materials used for insulation were characterized by using available laboratory testing model. A comparison of the measured and calculated temperatures validated both the experimental and numerical approaches. The performance evaluation showed a strong influence of the flow rate and solar radiation on the energy efficiency of the double pass finned solar collector. The global approach to heat balances within the solar collector is mainly based on the heat transfer coefficients between the fluid and the absorber. An estimation of these coefficients is proposed in the last part of this work.Keywords: Solar collector, double pass, millet rod crushed, biosourced material, numerical modeling, experiment, performance.