Simulation of heat and moisture transfer in a multiplex structure

• Published in: Energy and buildings Vol. 86; pp. 803 - 807
• Main Authors: Vasilyev, G.P., Lichman, V.A., Peskov, N.V., Brodach, M.M., Tabunshchikov, Y.A., Kolesova, M.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2015
• Subjects: Computer simulation; Coupled heat and moisture transfer; Diffusion; Finite-difference method; Mathematical analysis; Mathematical models; Modelling; Moisture; Multiplexing; Partial differential equations; Vapor pressure; Walls; Coupled heat and moisture transfer; Finite-difference method; Modelling
• ISSN: 0378-7788
• DOI: 10.1016/j.enbuild.2014.10.077

•A phenological model of heat and moisture transfer in building walls is described.•An algorithm for numerical solution based on the finite difference method is developed.•Numerical examples demonstrating model validity are considered.
We present a 1D numerical model of heat, steam, and water diffusion across a wall, consisting of several layers of different material. The model is a system of coupled diffusion equations for material temperature, vapour pressure, and water concentration in material pores, accounting for vapour condensation and water evaporation. The system of nonlinear partial differential equations (PDEs) is solved numerically using the finite difference method. The primary objective of modelling is the simulation of the long-term behaviour of the building wall moisture distribution under the influence of seasonal variations in atmospheric air temperature and humidity.