Combined effects of sorption hysteresis and its temperature dependency on wood materials and building enclosures-part II: Hygrothermal modeling

Zhang, Xiaobo; Zillig, Wolfgang; Künzel, Hartwig M.; Mitterer, Christoph; Zhang, Xu

doi:10.1016/j.buildenv.2016.06.033

Cited by 31 publications

(9 citation statements)

References 28 publications

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“…The difference between the three curves is small, it is higher for relative humidity less than 20% or greater than 50% while for the relative humidity in-between the moisture capacity is almost unaffected. This result corroborates the study from Zhang et al [24].…”

Section: Influence Of the Temperaturesupporting

confidence: 94%

Modeling Water Adsorption and Retention of Building Materials From Pore Size Distribution

Trabelsi¹,

Slimani²,

Younsi³

et al. 2019

Journal of Renewable Materials

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Water adsorption and capillarity are key phenomena involved during heat and moisture transfer in porous building materials. They account for interaction between solid matrix, liquid water and moist air. They are considered through Water Vapor Adsorption Isotherm (WVAI) and Retention Curve (RC) functions which are constitutive laws characterizing water activity within a porous medium. The objective of this paper is to present a water vapor adsorption and retention models built from multimodal Pore Size Distribution Function (PSDF) and to see how its parameters modify moisture storage for hygroscopic and near saturation ranges. The microstructure of the porous medium is represented statistically by a bundle of tortuous parallel pores through its PSDF. Firstly, the influence of contact angle and temperature on storage properties were investigated. Secondly, a parametric study was performed to see the influence of the PSDF shape on storage properties. Three cases were studied considering the number of modalities, the weight of each modality and the dispersion around mean radius. Finally, as a validation, the proposed model for WVAI were compared to existing model from literature showing a good agreement. This study showed that the proposed models are capable to reproduce various shapes of storage functions. It also highlighted the link between microstructure and adsorption-retention phenomena.

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Section: Influence Of the Temperaturesupporting

confidence: 94%

Modeling Water Adsorption and Retention of Building Materials From Pore Size Distribution

Trabelsi¹,

Slimani²,

Younsi³

et al. 2019

Journal of Renewable Materials

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“…This can cause significant discrepancies to predict the hygrothermal response of a material subjected to climatic variations as shown by Zhang et al. in the case of wood materials [22].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental and numerical evaluation of the hygrothermal performance of a hemp lime concrete building: A long term case study

Moujalled¹,

Ouméziane

Moissette

et al. 2018

Building and Environment

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Hemp-lime concrete (HLC) is a bio-based material which is currently undergoing a growing development. HLC is a low embodied energy material and an excellent hygrothermal regulator. Its thermal, hygric and mechanical properties are well known, and its capacity to reduce energy needs and to improve hygrothermal comfort is demonstrated across many laboratory and numerical studies. However, there are few works about its hygrothermal performance in real climatic conditions on the scale of a building. In order to address this issue, a long term in-situ measurement is carried out to analyze the hygrothermal performance of a HLC individual dwelling-house during 4 years. The analysis of the hygrothermal behavior of a wall is achieved by comparing measurements and numerical simulations results. In this study, two simulation tools are used and compared. The first tool

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“…Adding coffee grounds to starch in a proportion of 60% of the weight increases the thermal conductivity by 33%, reaching a value of 0.093 W/(m·K) for SSCC-40. This value remains nevertheless very acceptable and within the range of thermal conductivities of composite materials such as wood-fiber insulation material with λ = 0.05 W/(m·K), cork with λ = 0.039 W/(m·K), hemp with λ = 0.115 W/(m·K), or sisal fiber with λ = 0.070 W/(m·K) [ 39 ]. The rate of transmission of heat flow through the materials studied is characterized by their thermal diffusivity a .…”

Section: Resultsmentioning

confidence: 99%

Spent Coffee Grounds as Building Material for Non-Load-Bearing Structures

et al. 2022

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The gradual development of government policies for ecological transition in the modern construction sector leads researchers to explore new alternative and low environmental impact materials with a particular focus on bio-sourced materials. In this perspective, the mechanical, thermal insulation, and the sound absorption performances of a spent coffee grounds/potato starch bio-based composite were analyzed for potential application in buildings. Based on thermal conductivity and diffusivity tests, the coffee grounds waste biocomposite was characterized as an insulating material comparable with conventional thermal insulation materials of plant origin. Acoustical tests revealed absorption coefficients in the same range as other conventional materials used in building acoustical comfort. This bio-sourced material presented a sufficient compressive mechanical behavior for non-load-bearing structures and a sufficient mechanical capacity to be shaped into building bricks. Mechanical, thermal, and acoustic performances depend on the moisture environment. The groundwork was laid for an initial reflection on how this composite would behave in two opposite climates: the continental climate of Reims in France and the tropical climate of Belém in Brazil.

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Combined effects of sorption hysteresis and its temperature dependency on wood materials and building enclosures-part II: Hygrothermal modeling

Cited by 31 publications

References 28 publications

Modeling Water Adsorption and Retention of Building Materials From Pore Size Distribution

Modeling Water Adsorption and Retention of Building Materials From Pore Size Distribution

Experimental and numerical evaluation of the hygrothermal performance of a hemp lime concrete building: A long term case study

Spent Coffee Grounds as Building Material for Non-Load-Bearing Structures

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