Numerical and experimental data set for benchmarking hygroscopic buffering models

James, Christopher M.; Simonson, Carey J.; Talukdar, Prabal; Roels, Staf

doi:10.1016/j.ijheatmasstransfer.2010.03.039

Cited by 59 publications

(73 citation statements)

References 26 publications

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“…The configuration used to evaluate convective drying of an unsaturated porous material is taken from the experimental study of James et al [26], where hygroscopic buffering of gypsum boards was analysed by means of a small closed-circuit wind-tunnel setup. Here, two-dimensional fully-developed laminar channel flow (channel height H = 20.5 mm) was produced over the porous material (length L PM = 500 mm and thickness D PM = 37.5 mm, i.e.…”

Section: Configurationmentioning

confidence: 99%

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Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Defraeye

Blocken

Carmeliet

2012

International Journal of Heat and Mass Transfer

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Defraeye T., Blocken B., , Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling, International Journal of Heat and Mass Transfer 55 (1-3), 112-124. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011. does not require knowledge of convective transfer coefficients (CTCs) but allows determining the CTCs aposteriori, hence identifying their spatial and temporal variability, which is the main focus of this study.Comparison is made with porous-material modelling using spatially and/or temporally constant CTCs. Both spatial and temporal variations of the convective boundary conditions are found to have a distinct impact on the drying behaviour: the spatial CTC variation results in two-dimensional drying of the porous material due to leading-edge effects; the temporal CTC variation identifies distinct maxima in the drying rates at the surface right before the surface dries out locally. The CTCs obtained with conjugate modelling remain approximately constant during the constant and decreasing drying rate period (CDRP and DDRP, respectively), but a distinct variation is noticed at the transition of CDRP to DDRP. The heat and mass transfer analogy is found to be valid during the CDRP and to a lesser extent during the DDRP but large discrepancies are found during the transition of CDRP to DDRP. The advantages of conjugate modelling are indicated in this study but the need for detailed modelling of convective boundary conditions is however strongly dependent on the drying behaviour of the porous material and is not always required. Nomenclature

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Section: Configurationmentioning

confidence: 99%

“…Note that the same porous-material dimensions as in James et al [26] are used. This mineral plaster, used in outdoor environments, can absorb liquid water coming from wind-driven rain, i.e.…”

Section: Configurationmentioning

confidence: 99%

Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Defraeye

Blocken

Carmeliet

2012

International Journal of Heat and Mass Transfer

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“…However, the fact that specific properties of hygroscopic materials have not been taken into account in the coupled heat and mass transfers within regulatory calculation codes often leads to a poor estimate of energy consumption [59,60]. Nonetheless, hygroscopic materials have been shown to moderate indoor humidity levels and improve both thermal comfort and perceived air quality in buildings, while reducing energy consumption [61,62].…”

Section: Discussionmentioning

confidence: 99%

A field study of thermal and hygric inertia and its effects on indoor thermal comfort: Characterization of travertine stone envelope

Medjelekh

Ulmet

Abdou

et al. 2016

Building and Environment

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“…is property of wood and wooden materials has been largely investigated in many research works which showed wooden material ability to damp indoor humidity uctuations and assure indoor hygric comfort, (Hameury 2005, Kunzel et al 2004, Osanyintola et al 2006, Osanyintola and Simonson 2006, Simonson et al 2004, James et al 2010, Talukdar et al 2007). Most of the experimental and numeric research works aimed at assessing wood material performance are focused on the heat and moisture transfer in timber frame systems.…”

Section: Introductionmentioning

confidence: 99%

Laboratory experiments on hygrothermal behaviour of real-scale timber walls

Rafidiarison¹,

Mougel²,

Nicolas³

2012

Maderas, Cienc. tecnol.

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Hygrothermal performance of massive wood and wooden materials used as structural purposes in building envelope are measured by means of laboratory tests. For this purpose, hygrothermal short-time behaviour of two massive timber walls exposed to summer climatic conditions were investigated. A double climatic chamber simulating real on-site conditions was designed and built at the LERMAB/ENSTIB site in Epinal and used during wall behaviour assessment. Temperature and humidity variations with time were measured at di erent locations to determine pro les evolution of the investigated wall layers. Our results showed a contribution of wood and wooden insulation products in improving indoor thermal climate, as these materials allow a decrease and a signi cant delay of the important temperature variation of outdoor climate. Laboratory result was also compared to eld measurement for the cross-laminated wall system, time lag values for north and south walls showed that solar radiation have a non negligible e ect on temperature propagation within the wall.e variation of absolute humidity of the air in the cavity around humidity sensors installed in wall layers shows signi cant dependence with temperature variation. is phenomenon is consistent with the storage or realising of humidity during hygroscopic equilibrium between wood-based materials and its surrounding air.

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Numerical and experimental data set for benchmarking hygroscopic buffering models

Cited by 59 publications

References 26 publications

Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

A field study of thermal and hygric inertia and its effects on indoor thermal comfort: Characterization of travertine stone envelope

Laboratory experiments on hygrothermal behaviour of real-scale timber walls

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