Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Previous experimental studies and field measurements on moisture buffering by indoor surface materials
An increased interest in moisture buffering in the indoor environment (hygric inertia) and the development of more refined hygrothermal calculation tools call for a better understanding of the phenomenon. There are many materials indoors with potential to act as moisture buffers, ranging from traditional finishing materials as gypsum plaster to textiles. The objective of this study is to show that the interest in moisture buffering is not a new issue. There have been significant laboratory studies made in the past. This study presents a review of such previous studies (years 1960 - 2000) on indoor surface materials from Germany and Sweden, not published in English before. The publications reviewed cover over 40 different materials studied by step-response experiments in laboratory. The materials vary from cementous building materials to light curtain fabrics side by side with surface coated wood based products. An analytical expression for the change in water vapor concentration in the indoor air over time is shown. The moisture supply is assumed to be composed of two parts, a relatively constant supply from plants, inhabitants and pets and short moisture supply pulses from cooking, washing, showering, bathing and other short timed activities. Generally, all experimental studies reviewed suffer from the lack of information on the manner to assure that equilibrium conditions were reached. Simulations of indoor water vapor concentration were carried out and compared with observed data. The comparison shows large discrepancies when moisture buffering by surface materials is not taken into account. The studies show that most common indoor finishing materials interact with humidity variations in the air that occur on a diurnal basis in dwellings and offices. Surface coatings slow down the water vapor transport to and from the finishing material, coatings with large water vapor diffusion resistance bring the vapor exchange to virtually zero. The vapor absorption ability measured in laboratory was compared to experiments in test rooms under real climate conditions. These field measurements combined with simulations proved that moisture buffering is an indispensable element in the description of the water vapor balance in the indoor air.
Previous experimental studies and field measurements on moisture buffering by indoor surface materials
An increased interest in moisture buffering in the indoor environment (hygric inertia) and the development of more refined hygrothermal calculation tools call for a better understanding of the phenomenon. There are many materials indoors with potential to act as moisture buffers, ranging from traditional finishing materials as gypsum plaster to textiles. The objective of this study is to show that the interest in moisture buffering is not a new issue. There have been significant laboratory studies made in the past. This study presents a review of such previous studies (years 1960 - 2000) on indoor surface materials from Germany and Sweden, not published in English before. The publications reviewed cover over 40 different materials studied by step-response experiments in laboratory. The materials vary from cementous building materials to light curtain fabrics side by side with surface coated wood based products. An analytical expression for the change in water vapor concentration in the indoor air over time is shown. The moisture supply is assumed to be composed of two parts, a relatively constant supply from plants, inhabitants and pets and short moisture supply pulses from cooking, washing, showering, bathing and other short timed activities. Generally, all experimental studies reviewed suffer from the lack of information on the manner to assure that equilibrium conditions were reached. Simulations of indoor water vapor concentration were carried out and compared with observed data. The comparison shows large discrepancies when moisture buffering by surface materials is not taken into account. The studies show that most common indoor finishing materials interact with humidity variations in the air that occur on a diurnal basis in dwellings and offices. Surface coatings slow down the water vapor transport to and from the finishing material, coatings with large water vapor diffusion resistance bring the vapor exchange to virtually zero. The vapor absorption ability measured in laboratory was compared to experiments in test rooms under real climate conditions. These field measurements combined with simulations proved that moisture buffering is an indispensable element in the description of the water vapor balance in the indoor air.
Previous experimental studies and field measurements on moisture buffering by indoor surface materials
Frühere experimentelle Untersuchungen und Feldmessungen über Feuchtigkeitsspeicherung in den Innenraumoberflächenwerkstoffen
Svennberg, Kaisa (Autor:in) / Lengsfeld, Kristin (Autor:in) / Harderup, Lars-Erik (Autor:in) / Holm, Andreas (Autor:in)
Journal of Buildings Physics ; 30 ; 261-274
2007
14 Seiten, 5 Bilder, 6 Tabellen, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
beschichteter Werkstoff , Dekorationsstoff , Diffusion , Feuchteaufnahme , Feuchtemessung , Feuchtigkeitsaufnahmebestimmung , Feuchtigkeitsbeschlag , Feuchtigkeitsgehalt , Gips , Innenraum , Literaturüberblick , Möbel , Möbelbezugsstoff , numerische Simulation , Pufferspeicher , Stoffübertragung , Taupunkt , Textilien , Wasserdampf , Wasserdampfaustausch
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