METHOD FOR MANUFACTURING HEAT STORAGE DEVICE, METHOD FOR MANUFACTURING HEAT STORAGE MATERIAL, HEAT STORAGE MATERIAL, AND HEAT STORAGE DEVICE

Provided is a method for manufacturing a heat storage device, the heat storage device including a heat storage material that contains inorganic powder and sodium acetate, the heat storage material undergoing a phase change between a liquid state and a solid state; a heat storage material container configured to enclose the heat storage material; a nucleation device configured to phase-change the heat storage material from a liquid state to a solid state; the method including forming a heat storage material that is particulate and in a powder/granular form by mixing the sodium acetate and the inorganic powder, and filling the heat storage material container with the particulate heat storage material obtained in the forming a particulate heat storage material.