Abstract
The flowable latent heat storage material like Oil/Water type emulsion, microencapsulated latent heat material-water mixture or ice slurry, etc., is enabled to transport the latent heat in a pipe. Supercooling phenomenon of the dispersed latent heat storage material in continuous phase is obstructed by a latent heat storage. The latent heat storage rates of dispersed waterdrops in W/O (Water/Oil) emulsion are investigated experimentally in this study. The waterdrops in emulsion have the diameter within 3 - 25 μm, the averaged diameter of waterdrops is 7.3 μm and the standard deviation is 2.9 μm. Supercooling release of waterdrops in emulsion is examined by short time impressing of the ultrasonic. The direct contact heat exchange method is chosen as the phase change rate evaluation of waterdrops in W/O emulsion. The supercooled temperature is set as parameters of this study. The previous obtained experimental result, as the condition without impressing ultrasonic wave, showed that the 35 K or more degree from melting point brings 100% latent heat storage rate of W/O emulsion. It is clarified that it is possible to reduce 20 K of supercooling degree by impressing the ultrasonic.
Highlights
Much attention has been paid to research on the latent heat storage system
This study shows the experimental results of the latent heat-storage rate of the water in oil (W/O) emulsion by direct contact heat exchange method
The quantity of latent heat storage Ql of test W/O emulsion increases with increasing of the supercooling degree ΔTsc
Summary
Much attention has been paid to research on the latent heat storage system. The counting of freeze numbers of the fine waterdrops is one of methods of measuring the degree of supercooling in W/O emulsion. This method does not measure the amount of latent heat storages itself. This study shows the experimental results of the latent heat-storage rate (supercooling rate of dispersed waterdrops) of the water in oil (W/O) emulsion by direct contact heat exchange method. Authors’ previous research [16], as the condition without impressing ultrasonic, showed that the 35 K or more degrees from melting point brings 100% latent heat storage rate of W/O emulsion. The evaluation is performed by comparison between the results of this study and the past one
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