The melting of paraffin in thermal storage tube-and-shell and combine-and-shell models was conducted with the numerical\nresearch aim of decreasing the charge time through changing the shape of the tube into combining form. The results discussed\nare temperature contour, liquid-solid interface contour, temperature distribution, liquid fraction, and the average Nusselt number.\nThe results show that the charge time in the tube-and-shell model is 2000 s, while the combine-and-shell model is 1200 s, meaning\nan overall decrease in charge time in the combine-and-shell model by 40% when compared to that of the tube-and-shell model.
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