doi: 10.3850/978-981-08-7614-2_IMPRES015

ABSTRACT

Flow and heat transfer characteristics of Na₂HPO₄ hydrate slurries have been investigated. In order to set the fusion temperature at 35°C and to reduce the solubility of Na₂HPO₄, mixture of water and ethyleneglycol was used as the solvent. The concentration of ethyleneglycol was set at 40wt% in the mixture and the concentration of Na₂HPO₄ was set at 50wt% in the mixture solvent. The friction and the melting heat transfer coefficients were measured in a pipe flow with 13 mm of diameter. From the results, it was found that the friction coefficient of Na₂HPO₄ hydrate slurry shows almost the same as that of water. On the other hand, the slurry shows higher heat transfer than that of water. Especially, the heat transfer enhanced rate becomes high when the temperature difference between the slurry and the heating water flow and flow rate were set small. This is because of the temperature sustainability of phase change material slurries. From this, it was concluded that Na₂HPO₄ hydrate slurry can be a promising candidate for a heating system.

Keywords: Hydrate slurries, Latent heat transfer, Friction coefficient.

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