Study on a New Humidity Controlling Material Porous Soil “Allophane”: Design of Humidity Controlling Performance by Numerical Simulation

Japanese houses have been highly airtight and shut out the fresh air. Therefore, the quality of indoor air becomes inferior. The problems related to the damp of indoor environment have been increased with the change of lifestyles and architectural methods. Humidity control building material using porous soil “allophane” has been developed to control humidity environment in living space. Numerical simulation method based on heat and moisture transfer model was studied to estimate performance of humidity control material in various living space. It was found that building material could decrease humidity changes and inhibit overdry.