Moisture Accumulation in Building Façades Exposed to Accelerated Artificial Climatic Ageing—A Complementary Analysis to NT Build 495

Asphaug, Silje Kathrin; Time, Berit; Kvande, Tore

doi:10.3390/buildings11120568

Cited by 12 publications

(12 citation statements)

References 26 publications

(50 reference statements)

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“…We performed artificial climatic aging tests in SINTEF's climate simulator, as described in section 2.1, according to the Nordtest method NT Build 495:2000 [2]. This test was developed by SINTEF about 50 years ago and the method description was developed and later approved as the Nordtest method after many years of experience, including comparisons with natural climatic aging of façade materials [9,10]. The objective of the accelerated climate aging tests was to define the durability of specific variants of the SIP qualitatively.…”

Section: Methodsmentioning

confidence: 99%

Accelerated climate aging tests of structural insulated panels with waste-based core materials

Moschetti,

Gullbrekken,

Maia

2023

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One of the challenges of climate change in the building sector is related to the durability of materials, i.e., the resistance to degradation due to weathering over time. The durability of building components can be assessed through long-term natural outdoor climate exposure or appropriate accelerated climate aging in the laboratory. SINTEF Research Centre owns a climate simulator apparatus to perform aging tests according to the Nordtest method NT Build 495:2000. The aim of this article is to show the results from an accelerated climatic aging test performed on three different configurations of a structural insulated panel (SIP), which is characterized by waste-based core materials. The samples were tested for one month, corresponding to about one year of natural outdoor climate exposure. The results from the test performed in the climate simulator include information on the sample changes occurring during the analyzed period, together with the scale of such changes and the time of occurrence. Therefore, the test results are qualitative and based on the fact that a change in the performance properties of the samples corresponds to a change in their appearance during the test. This includes, for instance, signs of degradation, such as cracks, loss of gloss, or delamination.

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Section: Methodsmentioning

confidence: 99%

Accelerated climate aging tests of structural insulated panels with waste-based core materials

Moschetti,

Gullbrekken,

Maia

2023

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“…Traditionally, assessments of durability are conducted using the exterior climate as an input parameter. Assessments of accelerated artificial ageing methods show that the determination of precise boundary conditions is a challenge even for façades with only single-stage weatherproofing [18]. Assessing the durability of materials exposed to the microclimate of the air cavity will likewise require in-depth understanding of the climatic boundary conditions.…”

Section: Figurementioning

confidence: 99%

Microclimate of Air Cavities in Ventilated Roof and Façade Systems in Nordic Climates

2022

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Accurate values for the climatic conditions in an air cavity, hereby called the microclimate, are crucial when calculating and simulating the performance of a ventilated roof and façade system. The climatic stress of its components and their mould and rot potential influence the long-term durability of the roof or façade. A scoping study is conducted to gain an overview on research and the scientific literature on the microclimate of air cavities in ventilated roofing and claddings in Nordic climates. From the body of the research literature, 21 scientific works were of particular interest, and their findings are summarized. The review shows that only a limited number of studies discuss the microclimate of air cavities. Roofs are discussed to a greater and more varied degree compared to façades and air cavities behind solar panels. However, the results cannot be compared and validated against each other to generally describe the microclimate of air cavities, as the surveyed papers approach the subject differently. This knowledge gap indicates that calculations and simulations can be performed without knowing whether the results represent reality. If the structure of ventilated roof and façade systems are only designed based on experience, it can be difficult to be proactive and adapt to future climate changes. Further studies are needed to determine the relation between the exterior climate and the air cavity microclimate, so that future climate predictions can be used to simulate the long-term performance of ventilated roof and façade systems.

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“…The heat flux of the open-air wall was analyzed, and higher temperatures were observed on the open-air layer and inside the cavity. Since the correct design of internal ventilation and evaporative retardants seemed to be the main ways to control the ingress of moisture from internal sources [27][28][29], numerical simulations were performed [30] to investigate natural convection flow and heat transfer in vertical ducts, which are relevant to passive cooling in buildings, and the numerical results were validated using existing experimental data available in the literature. Narrow vertical channels with different aspect ratios were found to exhibit different heat transfer characteristics by indicating their importance in the design of passive cooling systems [31].…”

Section: Introductionmentioning

confidence: 99%

Research of Heat Tolerance and Moisture Conditions of New Worked-Out Face Structures with Complete Gap Spacings

Zhangabay,

Bonopera,

Baidilla

et al. 2023

Buildings

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In this work, two new face structures of the open-air protection fence were investigated, where a method was proposed for analyzing the condensation of water vapor in the protection fence to search for a condensation zone. Another method for calculating the amount of condensed vapor in a multiwall protection fence with closed gap spacings was proposed. The analytical results illustrated that the magnitude of the range of temperature variations of the worked-out structures with gap spacings and without heat-reflecting screens was 7.14% lower, while the existence of heat-reflective screens reduced this value to 27.14%. The investigation of the water vapor transmission magnitude demonstrated that the steam permeability strength of the interior side and retaining walls of the developed buildings amounts to the standard one, while the usage of a locked air space with a thermo-reflective panel allows the movement of the appropriate condensing region over the external face of the fencing. Mass analysis of the precipitated vapor during the heating time of 1 m2 of the retaining wall showed that in face structures in closed gap spacings with heat-reflective screens, the mass of the precipitated vapor was 24.8% greater relative to that of the face without heat-reflective screens. Moreover, the examination of the absence of distillation in the oxygenated gap spacing proved that, in the gap spacing in the considered face structures, the condensate does not fall out such that there is no aggregation of humidity according to the annual balance. Furthermore, the drying time of the face structure with heat-reflecting screens was 17.9% longer than that of the traditional one. The research results can complement the works performed earlier by the authors, as well as be applied in the engineering and construction of buildings to save thermal power, considering the climatic features of the development region.

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Moisture Accumulation in Building Façades Exposed to Accelerated Artificial Climatic Ageing—A Complementary Analysis to NT Build 495

Cited by 12 publications

References 26 publications

Accelerated climate aging tests of structural insulated panels with waste-based core materials

Accelerated climate aging tests of structural insulated panels with waste-based core materials

Microclimate of Air Cavities in Ventilated Roof and Façade Systems in Nordic Climates

Research of Heat Tolerance and Moisture Conditions of New Worked-Out Face Structures with Complete Gap Spacings

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