Modeling heat and moisture transfer of building facades thermally insulated by the panels with ventilated channels

Abstract

This work deals with a numerical study of the thermal and humidity state of a brick wall of a building insulated by panels with ventilated channels in a long-term operation cycle. A new physical and mathematical model has been developed for calculating heat and moisture transfer processes in facades with such panels. The model is based on the joint solution to a system of non-stationary differential equations of heat and moisture transfer in multilayer porous materials, taking into account adsorption processes and phase transitions. In addition, the model includes equations that describe the processes of heat and vapor transfer in ventilated channels. The results of calculations for a sharply continental climate have shown that two characteristic peaks of relative moisture content are observed in the insulating material of the panel. One of them corresponds to late summer - early autumn; the second peak corresponds to winter - early spring. The seasons corresponding to these peaks are the most critical in terms of wetting the mineral wool panel.