LATENT HEAT STORAGE APPARATUS AND LATENT HEAT STORAGE MATERIAL USED FOR THE SAME APPARATUS

摘要

PURPOSE:To take out cold-heat at a specified temperature lower than 0 deg.C while it is kept almost constant by a method wherein the concentrations of inorganic salts are set within concentration ranges in which cold-heat stored as freezing latent heat can be taken out from eutectic mixture or deposits of ice, inorganic salts and water at a nearly constant specified temperature. CONSTITUTION:A latent heat storage material is a N-component solution (N=3) consisting of at least water and two kinds of water-soluble inorganic salts, and the concentrations of inorganic salts in the latent heat storage material are set within concentration regions which do not exceed the concentrations of components corresponding to freezing point, eutectic point of water and components and eutectic point of N components. The latent heat storage material is cooled down to a temperature lower than the freezing point and further to a temperature lower than the freezing point declination effect, two-component eutectic mixture deposits in the descending order of binary eutectic freezing points of (N-1) kinds of inorganic salts, and is turned into two-phase state of ice, two-component eutectic mixture and inorganic salt solution. When cooling proceeds further and the temperature reaches the multiple-eutectic freezing point, N-component eutectic mixture deposits and the latent heat storage material is finally turned into a single phase solid mixture of ice, two-component eutectic mixture and N-component eutectic mixture. Therefore, cold-heat at a specified temperature lower than 0 deg.C can be taken out while it is kept almost constant.