In timber frame construction in Europe air barrier systems are typically realised at the interior side of the building envelope. Yet in some applications such as renovation projects it can be easier to provide the air barrier layer at the exterior. An exterior air barrier system, typically board materials in which the joints are sealed with tape, need to withstand severe outdoor weather conditions and maintain predefined air permeability values. The aim of the present article is to investigate the impact of severe climatic conditions on the airtightness of typical taped joints. The airtightness of thirty-two wood-fibre cement board samples has been investigated. Each specimen has a 2mm wide joint. Two different kinds of commercially available tapes were used to seal these joints. Airtightness of all specimens has been tested before and after accelerated ageing procedures that mimics real exterior climate conditions. Three different ageing protocols were selected: 1) temperature cycles, 2) temperature, rain and frost cycles and 3) UV exposure alternate with high humid conditions. For the first two test conditions, the specimens had a size of 0.71 by 0.71 m². Due to sample size restrictions of the UV exposure cabin, the specimens of the third test run were smaller (0.35m by 0.35m). All specimens had a thickness of 12mm. The present paper discusses the durability of the two tapes by comparing the air permeability of the specimens before and after accelerated ageing exposure. The results indicate that for both tapes tested the impact of the three artificial ageing methods on the air permeability is limited (increment less than 2 x 10 -5 m³/m/h/Pa).
The modeling approach outlined in this study provides an ideal form for advanced model-based control system design. The relatively low number of parameters makes it well suited for model-based control purposes, as a limited number of identification experiments is sufficient to determine these parameters. The model concept provides information about the air quality and airflow pattern in an arbitrary building. By using this model as a simulation tool, the indoor air quality and airflow pattern can be optimized.
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