Dynamic experimental method for identification of hygric parameters of a hygroscopic material

Busser, Thomas; Berger, Julien; Piot, Amandine; Pailha, Mickaël; Woloszyn, Monika

doi:10.1016/j.buildenv.2018.01.002

Cited by 25 publications

(28 citation statements)

References 36 publications

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“…Numerous studies report similar observations [19,[41][42][43]. These differences are usually assigned to uncertainties in input material data and boundary conditions, especially in the case of highly hygroscopic bio-based or wood-based materials made of natural products, whose properties may vary slightly from one sample to another.…”

Section: Comparison Between Simulation and Experimentsmentioning

confidence: 87%

“…These differences are usually assigned to uncertainties in input material data and boundary conditions, especially in the case of highly hygroscopic bio-based or wood-based materials made of natural products, whose properties may vary slightly from one sample to another. In the literature, we find several studies reporting that deviations appear when the samples are subjected to a rapidly changing dynamic load [22,43]. The key role is assigned to the sorption isotherm and the vapour permeability, which should be estimated via a dynamic method instead of the standard steady-state method.…”

Section: Comparison Between Simulation and Experimentsmentioning

confidence: 99%

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Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Kaczorek

2019

Applied Sciences

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In this paper, a series of experiments assessing the moisture buffer value (MBV) of four internal wall assembly samples made from hygroscopic materials was performed. A modified Nordtest protocol was used. Moisture buffer values of all the investigated wall assemblies, with varying moisture loads in the range of 50% to 80%, showed a moderate moisture buffer value (MBV: 0.5–1.0 (g·m−2·%RH−1)). The results showed that in a wall assembly where the MBV of the whole assembly is lower than the MBV of the outer layers, the moisture-buffering capacity of the inner layer is untapped. Outer layers affect inner layers by changing their moisture-buffering capacity, which in turn changes the overall performance of the whole assembly. In addition, it was observed that if the penetration depth value of the outer layer is greater than its thickness, vapour reaches into the deeper layer and wall assemblies made of layers with materials characterized by a lower value of penetration depth reach steady state more slowly. The WUFI Pro tool was used to compare the simulated and experimental results. Despite the discrepancies between these results, it offers a simplified method, helping designers make decisions about which materials to choose to improve the moisture-buffering effect.

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Section: Comparison Between Simulation and Experimentsmentioning

confidence: 87%

Section: Comparison Between Simulation and Experimentsmentioning

confidence: 99%

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Kaczorek

2019

Applied Sciences

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“…In that paper, hygrothermal properties of wood-based products were measured, including the sorption isotherm and vapour permeability of wood-fibre insulation. In the four years since that publication, these results have been referenced frequently [2][3][4][5][6][7][8][9][10][11]. The present author contends though that the study in [1] contains flaws in the measurement, calculation and presentation of the vapour permeability of woodfibre insulation.…”

Section: Introductionmentioning

confidence: 84%

“…The present author contends though that the study in [1] contains flaws in the measurement, calculation and presentation of the vapour permeability of woodfibre insulation. These have led to the wider adoption of incorrect permeabilities [2][3][4][5][6][7][8][9][10][11], which in turn have resulted in debateable claims, on the inaptitude of stationary vapour diffusion experiments [8,10] and on the importance of advection in hygroscopic ad-/desorption [9,11]. The goal of this discussion is to reveal the erroneous measurements, calculations and presentations in [1] as well as to discuss the ramifications for the investigations [2][3][4][5][6][7][8][9][10][11] making use of [1]'s outcomes.…”

Section: Introductionmentioning

confidence: 99%

A discussion of “Characterization of hygrothermal properties of wood-based products – Impact of moisture content and temperature”

Janssen

2018

Construction and Building Materials

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In 2014, this journal published the paper "Characterization of hygrothermal properties of woodbased products -Impact of moisture content and temperature", presenting among others the vapour permeability of wood-fibre insulation. This discussion demonstrates that the measurement, the calculation and the presentation of this vapour permeability has suffered from various errors, invalidating the obtained intrinsic vapour permeabilities of wood-fibre insulation. This discussion moreover demonstrates that several subsequent authors have furthermore misinterpreted their air-gap-corrected vapour permeabilities as intrinsic vapour permeabilities, which in turn invalidates, at least in part, these authors' challenges to the state-of-the-art on the measurement and simulation of hygroscopic moisture transport in porous materials.

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“…Materials can stabilize room air humidity within a certain range [1]. Their effect depends on the difference in moisture content between the indoor and outdoor air and the capability of moisture exchange with the indoor air [2]. The use of hygroscopic materials can improve indoor air quality and human comfort [3,4].…”

Section: Introductionmentioning

confidence: 99%

Research on the Comprehensive Performance of Hygroscopic Materials in an Office Building Based on EnergyPlus

Cui

Shao

et al. 2019

Energies

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This paper presents the research status of hygroscopic materials, points out the weak links as targets for major breakthroughs, and introduces humidifying mechanisms and their categories. In this paper, we simulated a single-monomer Shenyang office building with different envelopes of inner-surface hygroscopic materials for indoor humidity conditions, energy consumption, and economy, which are three aspects of energy consumption analysis in EnergyPlus software. To obtain the best moisture buffering performance from hygroscopic materials, we also simulated different cases including the laying area, ventilation strategy, thickness, and initial moisture content of different hygroscopic materials. The humidity fluctuation, with changes in the style of hygroscopic materials and usage conditions, of a room in a building can be analyzed by numerical simulation. This allows the determination of the best moisture buffering performance of the building structure. The results show that hygroscopic materials have great advantages in three energy saving aspects of building assessment. Hygroscopic materials can regulate indoor air humidity and reduce energy consumption. In addition, the entire life-cycle cost can be minimized. Lower rates of air exchange and larger usable areas can help enhance the level of performance of hygroscopic materials. The thickness and initial moisture content of hygroscopic materials have little impact on the moisture buffering value. This study strived to provide a theoretical basis and technical guidance for the production and installation of hygroscopic materials. It also promoted the passive materials market and the building’s energy savings. The best moisture buffering performance, evaluated at room level in this paper, can be obtained through real-world environmental simulation.

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Dynamic experimental method for identification of hygric parameters of a hygroscopic material

Cited by 25 publications

References 36 publications

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

Moisture Buffering of Multilayer Internal Wall Assemblies at the Micro Scale: Experimental Study and Numerical Modelling

A discussion of “Characterization of hygrothermal properties of wood-based products – Impact of moisture content and temperature”

Research on the Comprehensive Performance of Hygroscopic Materials in an Office Building Based on EnergyPlus

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