Abstract
The heat-recovery rate has been determined in a latent-heat storage unit using Na 2HPO 4 · 12H 2O as a heat-storage medium. The effects of the liquid flow rate and inlet temperature of the heat-transfer fluid on the heat-recovery rate have been determined. The heat-recovery rate decreases sharply at the beginning of the heat-recovery stage. The measured thermal resistances during heat recovery are found to be smaller than the calculated values since the crystals of Na 2HPO 4 · 12H 2O grow in dendritic shapes which act as fins for heat transfer. The thickness of the crystallized heat-storage material has been correlated in terms of Fourier, Stefan, and Reynolds numbers.
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