The deformation of the Rock wool board external thermal insulation system based on coupled temperature and relative humidity

Abstract

A coupled heat and humidity transfer model of external thermal insulation wall is established. The effects of different climatic conditions (winter and summer) on the deformation of the rock wool board external insulation system were simulated and analyzed by the meteorological database from Shanghai. The results show that the changes of strain and stress are fluctuated because of the variation of temperature and relative humidity, and their extremum values appear with the extreme value of temperature and relative humidity difference. The coating mortar has the highest stress and strain, and the rock wool board has the lowest stress and strain. The maximum stress can reach 1.97×10-3MPa and the maximum strain can reach 1.36×10-4 of the rock wool thermal insulation system during the periodic changes in temperature and relative humidity within 72 hours in winter and summer.