Experimental Study on Latent Heat Storage Characteristics of W/O Emulsion by Ultrasonic Wave Impression

Shin-ichi Morita, Yasutaka Hayamizu, Akihiko Horibe, Naoto Haruki, Hideo Inaba, Issei Higashi

Department of Mechanical Engineering, Yonago National College of Technology, Yonago, Japan.
Edit Inc., Fukuoka, Japan.
Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan.
Shujitsu University, Okayama, Japan.

DOI: 10.4236/ojfd.2013.32A008                

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.

Keywords

Heat Storage; Latent Heat; W/O Emulsion; Direct Contact Heat Exchange; Ultrasonic

Conflicts of Interest

The authors declare no conflicts of interest.

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