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Flow behavior and phase equilibrium of TBPB hydrate slurry in porous media for refrigeration application.

Comportamiento de flujo y equilibrio de fases de las suspensiones de hidratos de TBPB (bromuro de tetra-n-butilfosfonio) en medios porosos para aplicaciones de refrigeración.

Author(s) : CLAIN P., NDOYE F. T., DELAHAYE A., et al.

Type of article: Article

Summary

The present work investigates the use of hydrates, as appropriate media for cold storage and distribution in refrigeration applications. Previous studies showed that these hydrates are able to trap molecules of carbon dioxide resulting in mixed hydrates. Hydrate can be used as phase change material (PCM) for thermal energy storage and hydrate slurries could be a good solution for industrial issues of cold distribution at various temperature levels. In fact, hydrates formed from tetra-n-butylphosphonium bromide (TBPB) + water mixtures have equilibrium conditions required for air-conditioning applications, with melting temperature at 281 K at atmospheric pressure. Calorimetry devices were used for determining dissociation enthalpies of salt hydrates under vari-ous stability conditions and salt concentrations in bulk and porous media. The results reveal that TBPB hydrates formed in porous media at lower temperature than in bulk conditions for a constant pressure due to capillary forces. In order to characterize the flow behavior of hydrate slurries for cold distribution, a rheological study was carried out in a dynamic loop by the Ostwald method. Finally, FBRM probe was used for a particle size analysis of TBPB hydrate and showed a bimodal distribution which could be confirmed in further work in order to define a potential relation between hydrate particle size and rheological behavior of hydrate slurry.

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Pages: 3-10

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Details

  • Original title: Comportamiento de flujo y equilibrio de fases de las suspensiones de hidratos de TBPB (bromuro de tetra-n-butilfosfonio) en medios porosos para aplicaciones de refrigeración.
  • Record ID : 30008610
  • Languages: Spanish
  • Source: Frío Calor Aire acondicionado - vol. 41 - n. 460
  • Publication date: 2013/07

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