E101 DEVELOPMENT OF A COMPACT AND AN EFFICIENT ICE THERMAL ENERGY STORAGE VESSEL USING A LOW CONCENTRATION AQUEOUS SOLUTION : FUNDAMENTAL EXPERIMENTS(Energy storage, melting and solidification)

概要

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If an aqueous solution with low concentration is used for static-type ice-storage-vessels, even when a large amount of solution (aqueous ethylene glycol in this study) is solidified and bridging of ice developed around cold tubes occurs, the pressure increase could be prevented by the existence of a continuous liquid phase in the solid-liquid two-phase layer (mushy layer) which opens to an air gap at the top of the vessel. Therefore, one can continue to solidify the aqueous solution after the bridging, achieving a high ice packing factor (IPF). In the present study, pressure rise has been measured using a specially prepared test cell for initial concentration of the aqueous solution, Co , of 0%-0.5%. In addition, solidification and melting experiments using a small-scaled test cell with eight tubes have been conducted for the aqueous solution with Co= 0% to 2.0%. It was seen that a large pressure increase is prevented for Co ≥ 0.5%, and the IPF obtained by using the solution with 0.5%<Co ≤ 1.0% is much greater than 0.65 using pure water for which the solidification must be stopped before the bridging.
一般社団法人日本機械学会の論文
2000-10-01