Coupled Heat And Moisture Transport In A
Building Envelope On Cast Gypsum Basis
Author(s)
J. Maděra, P. Tesárek & R. Černý
Abstract
Flue gas desulphurization (FGD) gypsum can be potentially used as a material
for load bearing structures. In this paper, a computational assessment of
hygrothermal performance of a building envelope based on several modifications
of FGD gypsum is presented. In the computer simulations of temperature and
relative humidity fields, three variations of FGD gypsum wall, based on the raw
material and on two types of hydrophobized gypsum, with the thickness of 300
mm, are solved. The thermal insulation function of the wall is achieved by
exterior thermal insulation boards with the thickness of 100 mm, which are
considered in four variants. Insulation I is hydrophilic material with a low value
of hygroscopic moisture content on mineral wool basis, Insulation II capillary
active material with higher value of hygroscopic moisture content on calciumsilicate
basis, Insulation III hydrophobic material with a low value of water
vapor resistance factor on mineral wool basis and Insulation IV hydrophobic
material with higher value of water vapor resistance factor on polystyrene basis.
Lime plaster with the thickness of 10 mm is used on the exterior wall surface.
The computational analysis reveals that use of hydrophobization admixtures in
the gypsum element does not lead to any improvement of hygrothermal behavior
of the envelope provided by an exterior thermal insulation. Therefore, the
application of a gypsum element without any hydrophobization seems to be a
more favorable solution. The common hydrophobized thermal insulation
materials on the basis of polystyrene or mineral wool are found to be satisfactory
from the point of view of hygrothermal performance of the analyzed castgypsum
based envelope.
Keywords: building envelope, flue gas desulphurization (FGD) gypsum, thermal
insulation boards, heat and moisture transport.
Keywords
building envelope, flue gas desulphurization (FGD) gypsum, thermal
insulation boards, heat and moisture transport.
Related Book
Other papers in this volume
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