Numerical Simulation of radon migration influenced by heat-moisture coupled transfer in aerated concrete wall under different outdoor temperature and humidity conditions

Abstract

It is of great significance for indoor radon radiation protection to study the mechanism of radon migration systematically caused by heat-moisture coupled transfer in building walls. The radon migration model of porous building walls under the influence of the heat-moisture coupled model is built. On the base of it, four types of different temperature and humidity conditions, including high temperature and high humidity, high temperature and low humidity, low temperature and high humidity and low temperature and low humidity, and the real ambient temperature, relative humidity conditions in a southern city of China in July, are set for the numerical simulation. The migration mechanism of the radon through the wall influenced by outdoor temperature and humidity conditions, including its emanation, diffusion and condensation, is studied by numerical simulation, and the main factors leading the results are analyzed, which provides some reference for indoor radon radiation protection.

Humidity Conditions of Aerated Concrete Walls Depending on the Type of Finishing Coating

“…The construction of buildings using aerated concrete involves the application of a decorative finishing layer. To prevent excessive moisture and maintain the heat-shielding qualities of aerated concrete, it is important to consider the vapor permeability of the finishing layers [5][6][7][8][9][10][11]. Excess moisture in the wall not only worsens the heat-shielding qualities of aerated concrete, but also reduces its service life.…”