Study of the conservation and exhibition of burned wall paintings in the main hall of the treasure house at Horyu-ji Temple

Abstract

Horyu-ji Temple is the main temple and Buddhist monument in the Horyu-ji area designated a UNESCO world heritage site since 1993. In 1949, the main hall in the Horyu-ji Temple, Nara prefecture, Japan, suffered a fire. Paintings on the burned walls are now stored with other cultural property in the treasure house which has no air conditioning, and doors and windows that are always closed. There is a fear of mold and pest generation due to high relative humidity in the room, so the environment must be controlled to protect the wall paintings from biological damage. Furthermore, Horyu-ji is considering an exhibition of the burned wall paintings in the treasure house, and we therefore need to consider the impact of visitors' heat and moisture on the generation of mold and pests on the wall. I investigated environmental control methods using a blower in the attic space by numerical analysis. The analysis was performed in two case scenarios. One case involved preserving the walls in a closed treasure house and the other supposed an exhibition. As a result of this analysis, the effect of the reduction of relative humidity using a blower was clarified quantitatively.