| 摘要 |
PURPOSE:To obtain a latent heat storage material which causes a reduced supercooling when solidifying and reveals stable performance during heat cycles over a long period of time by incorporating a specified inorganic compound as a nucleating agent into potassium alum dodecahydrate. CONSTITUTION:A latent heat storage material made by incorporating a nucleating agent comprising cesium sulfate, cesium chloride, manganese carbonate monohydrate or ammonium manganese sulfate hexahydrate into potassium alum dodecahydrate. Although an extent to which the degree of supercooling is reduced varies depending on the amount of a nucleating agent added, the addition of too much nucleating agent cannot give an effect as expected and also leads to deterioration of the material. Therefore, the nucleating agent is used generally in an amount of about 0.05-20wt.% based on potassium alum dodecahydrate. Once the heat storage material undergoes solidification by, e.g. cooling potassium alum dodecahydrate in supercooled melt form to about -30 deg.C or adding potassium alum dodecahydrate thereto, the nucleating action can be revealed so that the latent heat storage material can show a stable effect of preventing supercooling during heat cycles over a long period of time. |
