Abstract
Based on the measurement result of a building thermal mass storage system with air insufflations in use, a method to approximately calculate the charging/discharging rate of heat was worked out. Simulations with this method were carried out under various conditions of air insufflation, operation hour, etc., and have given approximate expressions, which can be applied to most cases to calculate the stored amount of heat. It has been found out that the discharging rate of heat at the corresponding time is almost the same, regardless of charging conditions, and it is utilized to generate a daily profile of heat load.