HEAT STORAGE MATERIAL

PURPOSE: To provide a heat storage material which has a melting point within a specified temperature range, has a low-level corrosiveness and can be used under stabilized conditions over a long period, prepared by adding ZnCl2.3H2O and/or MnCl2.4H2O to a compsn. consisting of CaCl2.6H2O and MgCl2. 6H2O. CONSTITUTION: ZnCl2.3H2O and/or MnCl2.4H2O is added to a compsn. consisting of CaCl2.6H2O and MgCl2.6H2O. The known latent heat storage material consisting of CaCl2.6H2O (melting point: 29.2°C) shows lowring of the melting point by increasein the water content or under the action of additives, but when the water content is increased, it fuses or freezes within a certain temperature range and no longer shows a fixed melting point nor freezing point and can not be used when heat exchange is required within a narrow temperature range. The heat storage material of this invention has a melting point within the range of 5W28°C, has a low-level corrosiveness and stands repeated heat storage/ heat dissipation under stabilized conditions for a long period. It is useful, e.g., for greenhouse and room cooling in which a refrigerator is operated by utilizing midnight power supply to freeze the heat storage material for daytime air conditioning.COPYRIGHT: (C)1983,JPO&Japio