To accurately and efficiently charging a prescribed amount of silver iodide into a thermal energy storing vessel and obtain an aqueous latent heat thermal energy storing material composition by reacting an aqueous solution of silver nitrate with an aqueous solution of an iodide in the thermal energy storing vessel.
This thermal energy storing material composition is obtained by charging (A) an aqueous solution of silver nitrate at preferably ≤1 N, more preferably ≤0.1 N, far more preferably ≤0.01 N concentration and (B) an aqueous solution of an iodide at preferably ≤1 N, more preferably ≤0.1 N, far more preferably ≤0.01 N concentration into a thermal energy storing vessel, then reacting the components A with B and depositing silver iodide in the thermal energy storing vessel. The component A is prepared by dissolving the silver nitrate of the industrial specification or the reagent specification in, e.g. tap water or pure water treated with an ion exchange resin at about ≥5°C. The component B is prepared by dissolving, e.g. the iodide in pure water at about ≥5°C.
ICHIKAWA YUKIHIKO
KUBOKAWA SEIICHI
RHOMBIC CORP
MITSUBISHI CHEM ENG CORP