Convection correlations analysis for air/PCM exchanger
Résumé
The air/PCM heat exchanger described in this paper consists in horizontal PCM plates separated by an air flow. This is a storage system dedicated to insure a better summer thermal comfort. It stores freshness during the night and releases it in the house during the day. The purpose of presented work is to contribute in the improvement of the modeling of air / PCM convective exchanges. In this kind of exchanger, we are confronted to different flow patterns, which must be taken into account in the choice of the convective coefficient. So a detailed study of flow patterns encountered in the exchanger is first performed and appropriate correlations from the literature are selected. These one are tested on a numerical model of the heat exchanger. The results are compared to experimental data. Here, a rigorous choice of the correlations, according to the flow patterns, does not seem to improve significantly the numerical results comparing to the use of a single correlation representative of the most covering flow structure. Other model errors must be tackled before we can appreciate the improvement due to the correlation choice. Keywords: air/PCM exchanges, exchanger, convection, simulation, experimental results
Origine : Fichiers produits par l'(les) auteur(s)
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