Qualitative and quantitative assessment of interior moisture buffering by enclosures

Janssen, Hans; Roels, Staf

doi:10.1016/j.enbuild.2008.11.007

Cited by 85 publications

(74 citation statements)

References 22 publications

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“…The interior moisture buffering capacity is made probabilistic by varying the hygric inertia per cubic meter of room (HIR*), see Eq.(4). The considered range goes from no buffering elements up to the availability of woollen carpets and wooden bookshelves, as described in [46]. …”

Section: Probabilistic Characteristics and Boundary Conditionsmentioning

confidence: 99%

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Interior insulation for wall retrofitting – A probabilistic analysis of energy savings and hygrothermal risks

Vereecken

Gelder

Janssen

et al. 2015

Energy and Buildings

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130

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Interior insulation is often the only possible post-insulation technique to improve the thermal performance of single leaf masonry walls. As a result of potential damage patterns such as frost damage, interstitial condensation and mould growth however, there is often some reluctance to adopt this technique. To fully exploit the capacity for energy savings offered by interior insulation while avoiding hygrothermal failure, a reliable risk assessment is extremely important. This requires a probabilistic Postprint: Vereecken E, Van Gelder L, Janssen H, Roels S, 2015. Interior insulation for wall retrofitting -A probabilistic analysis of energy savings and hygrothermal risks. Energy and Buildings 89: 231-244. doi.org/10.1016/j.enbuild.2014.12.031 approach, since the uncertainty of all influencing parameters might result in widely varying results.As, so far, no real methodology is available to select the interior insulation system and thickness resulting in the best balance between energy savings and hygrothermal risks, this paper presents a decision tool based on a Monte Carlo analysis. Additionally, the influence of the rain load and some masonry characteristics is discussed. In the study, both vapour tight interior insulation systems and a capillary active insulation system are considered. Overall, vapour tight systems tend to be preferable for structures that are resistant to frost damage. For buildings sensitive to frost damage or when wooden beam ends are present, however, capillary active systems are shifted forward.

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Section: Probabilistic Characteristics and Boundary Conditionsmentioning

confidence: 99%

“…The moisture balance of the room is described by the effective capacitance (EC-) model [46], wherein the air capacity is enlarged by using the hygric inertia of the room (HIR*):…”

Section: Hygrothermal Modelmentioning

confidence: 99%

Interior insulation for wall retrofitting – A probabilistic analysis of energy savings and hygrothermal risks

Vereecken

Gelder

Janssen

et al. 2015

Energy and Buildings

Self Cite

130

View full text Add to dashboard Cite

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“…3 for concrete and cellular concrete from [74], gypsum plaster, wood fibreboard and cellulose insulation from [75], sprayed hempcrete (hemp concrete) from [73], lime-hemp concrete from [76], hemp lime concretes with increasing substitution of lime-based binder for sulphate-based binder (F1: 1/3 sulphate-based binder + 2/3 lime-based binder; F2: 1/2 + 1/2; F3: 2/3 + 1/3) [77]. These properties are also well summarised in reference [78]. …”

Section: Hygrothermal Propertiesmentioning

confidence: 87%

Overview on Biobased Building Material made with plant aggregate

2016

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Global warming, energy savings, and life cycle analysis issues are factors that have contributed to the rapid expansion of plant-based materials for buildings, which can be qualified as environmental-friendly, sustainable and efficient multifunctional materials. This review presents an overview on the several possibilities developed worldwide about the use of plant aggregate to design bio-based building materials. The use of crushed vegetal aggregates such as hemp (shiv), flax, coconut shells and other plants associated to mineral binder represents the most popular solution adopted in the beginning of this revolution in building materials. Vegetal aggregates are generally highly porous with a low apparent density and a complex architecture marked by a multi-scale porosity. These geometrical characteristics result in a high capacity to absorb sounds and have hygro-thermal transfer ability. This is one of the essential characteristics which differ of vegetal concrete compared to the tradition mineral-based concretes. In addition, the high flexibility of the aggregates leads to a non-fragile elasto-plastic behavior and a high deformability under stress, lack of fracturing and marked ductility with absorbance of the strains ever after having reached the maximum mechanical strength. Due to the sensitivity to moisture, the assessment of the durability of vegetal concrete constitutes one of the next scientific challenging of bio-based building materials.

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“…Attained results of MBV practical correspond with the observation obtained within the evaluation of sorption and desorption isotherms. According to the conclusion formulated in (Yang et al 2012) and (Janssen, Roels 2009), these apparently contradictory findings can be explained by the differences in the pore size distribution, where smaller pore diameter of PP has higher surface area and therefore, better capability to bind molecules of water vapor. Compared to the MBV ideal results (see Fig.…”

Section: Fig 2 Sorption and Desorption Isotherms Of Studied Plastersmentioning

confidence: 99%

Moisture Buffering Potential of Plasters for Energy Efficiency in Modern Buildings

Fořt

Doleželová

Černý

2017

Proccedings of 10th International Conference "Environmental Engineering"

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Abstract. Moisture level significantly affects durability of constructions, their thermal performance and quality of indoor air. Since building envelopes are subjected to a moisture gradient, additional ventilation systems are employed to maintain relative humidity on the desired level. Although modern advanced ventilation systems provide sufficient air exchange rate, their wider application is in conflict with sustainability development principles due to high energy demands. Moreover, according to the European legislation related to the Nearly Zero Energy Buildings (European Directives 2002/91/EC and 2010/31/EU), air tightness of building envelopes in order to provide high thermal resistance leads to large moisture loads in building interiors. Among other factors, a high level of relative humidity has negative effect on the work efficiency and health of building inhabitants. A detailed insight into building materials behavior during cyclic moisture loading was accessed within this study. The moisture buffering values of three interior plasters were investigated in order to describe influence of plasters on moderation of indoor environment. Particular materials were loaded according to the NORDTEST protocol by 8/16 h loading schema at 70/30% RH. Here, the excellent moisture buffer classification was obtained for lightweight perlite plaster (PT) with the highest total open porosity. However, contrary to the higher total open porosity of renovation plaster (PS), the core plaster (CP) achieved higher moisture buffer capacity than PS. This discrepancy refers to the influence of the pore size distribution which is, besides the total open porosity, essential for a detailed characterization of moisture buffering potential of building materials. Based on the results of Mercury intrusion porosimetry, a correlation between pore size distribution and moisture buffer value was revealed.

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Qualitative and quantitative assessment of interior moisture buffering by enclosures

Cited by 85 publications

References 22 publications

Interior insulation for wall retrofitting – A probabilistic analysis of energy savings and hygrothermal risks

Interior insulation for wall retrofitting – A probabilistic analysis of energy savings and hygrothermal risks

Overview on Biobased Building Material made with plant aggregate

Moisture Buffering Potential of Plasters for Energy Efficiency in Modern Buildings

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