Hygric and Thermal Properties of Materials Involved in the Envelopes of Contemporary Buildings

doi:10.3850/978-981-08-7920-4_S3-M022-cd

Hygric and Thermal Properties of Materials Involved in the Envelopes of Contemporary Buildings

Václav Kočí, Miloš Jerman and Robert Černý

Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Prague, Czech Republic

ABSTRACT

The hygric and thermal properties of building materials are an indispensable part of the input parameters database of HEMOT computer code for modeling coupled heat and moisture transport in building envelope systems. In this paper, the methods for determination of hygric and thermal properties of materials which are used in contemporary buildings in Czech Republic are demonstrated on the example of expanded polystyrene. Apparent moisture diffusivity is determined by method utilizing the results of water sorptivity measurements, water vapor diffusion permeability is measured by the cup method. Sorption isotherms are determined by the desiccator method in the range of relative humidity of 11%–96%. Thermal conductivity and specific heat capacity are measured by an impulse technique. Finally, an example of calculation of temperature and moisture fields in two typical building envelopes using the HEMOT computer code is given.

Keywords: Experimental methods, Computational analysis, Hygric and thermal properties, Climatic data, Building envelope.

Back to TOC

FULL TEXT(PDF)