TED-AJ03-283 Study on Fluid Latent Heat Storage Material using Ethanol-water Mixture
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Ethanol-water mixture has possibilities to succeed as a coolant or thermal energy storage substance because it satisfies the following requirements : it is a fluid at low temperatures and it provides a balance between the nature and environment. In the present study, a natural secondary refrigerant was investigated using ethanol-water mixture. As the ethanol-water mixture is a binary solution, it can have a solid-liquid phase. But there are so few data available at present for describing the behavior of the ethanol-water mixture. There are three two-phase regions in the phase diagram of an ethanol-water mixture. If any of these three regions are chosen, it is probable that the solid-liquid two phase can be used as a latent heat storage material with fluidity. These regions are referred to in the paper as (L+S_0), (L+S_1) and (L+S_2) regions. The solid phase in the region (L+S_0) is ice, and by using this region, it is possible to use ethanol-water mixture in a wide temperature region like, 0℃ to-70℃, in a thermal energy storage system. The solid portion S_1 in (L+S_1) region is a hydrate of ethanol. On the other hand, solid portion S_2 in (L+S_2) region is ethanol. In this study, a fluid material for latent heat storage was developed using an ethanol-water mixture to utilize low-temperature energy of LNG. Experiments were conducted under stirred conditions and the fluidity of the solution was measured for various concentrations. We observed the crystal growth of ethanol-water mixture and developed the new fluid latent heat storage material. And the differential scanning calorimeter (DSC) was used to investigate the latent heat of ethanol-water mixture. It was found that a fluid mushy formation can be made at low temperatures and that this formation can be used as a latent heat storage material.[figure]
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