Simulation nume´rique des transferts thermiques couple´sa`travers les parois alve´olaires des baˆtiments

Abdelbaki, Abdelhalim; Zrikem, Z.

doi:10.1016/s1290-0729(99)80065-9

Cited by 22 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results of other authors [18] on a same square cavity in which only convection is studied are also reported. The agreement is good: the maximal deviation with [17] in Nusselt number is 1%.…”

Section: Two-dimensional Numerical Heat Transfer Model In Partitionedmentioning

confidence: 88%

Theoretical and experimental study of heat transfer through a vertical partitioned enclosure: Application to the optimization of the thermal resistance

Sabourin

Lartigue

Monchoux

et al. 2008

Applied Thermal Engineering

View full text Add to dashboard Cite

Section: Two-dimensional Numerical Heat Transfer Model In Partitionedmentioning

confidence: 88%

Theoretical and experimental study of heat transfer through a vertical partitioned enclosure: Application to the optimization of the thermal resistance

Sabourin

Lartigue

Monchoux

et al. 2008

Applied Thermal Engineering

View full text Add to dashboard Cite

“…To accelerate the convergence of solutions, the governing equations are solved in their instationary form. The simulation program was tested in previous studies by comparing its results with those reported in the literature in the following different cases: i) Differentially heated square cavity (Abdelbaki and Zrikem 1999;Abdelbaki et al 2001). ii) Coupled convection and radiation in rectangular cavities; heated from below square cavity with sinusoidal thermal excitation; coupled conduction, convection and radiation in horizontal hollow concrete bricks (Ait-Taleb et al 2008a, b) To realize a compromise between the accuracy and the computation time, a study on the effects of both grid spacing and time step on the simulation results has been conducted for each type of hollow blocks.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In these studies, it has been shown that natural convection heat transfer is significantly reduced by conduction in the walls and/or radiation exchange between the cavity surfaces. Coupled heat transfers by conduction, natural convection and radiation in cellular structures with two vertical series of square cavities has been studied numerically (Abdelbaki and Zrikem 1999). Application was presented for building vertical walls made of hollow clay tiles.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation by the FVM of coupled heat transfers by conduction, natural convection and radiation in honeycomb’s hollow bricks

2009

Self Cite

View full text Add to dashboard Cite

This paper presents a detailed numerical study, in steady state regime, of the interaction between two dimensional heat transfers by conduction, natural convection and radiation in double hollow bricks formed by two honeycomb walls separated by an air layer. The air motion in all cavities of the system is laminar. The left and right vertical sides of the hollow bricks are considered isothermal and maintained at different constant temperatures. The top and bottom horizontal sides are assumed to be adiabatic. The governing equations are solved using the finite volume method (FVM) and the SIMPLE algorithm. The impact of the thickness of the air layer on the global heat flux through the structure is discussed. The simulation results show that the variation of the overall heat flux through each hollow brick as a function of the temperature difference ΔT between the vertical sides of the system is almost linear for the different types of double hollow bricks considered.This linear thermal behaviour allowed the generation of appropriate overall heat exchange coefficients that permit fast and accurate prediction of heat transfers through the hollow bricks without solving the complex system of equations governing the coupled heat transfers. Comparison of the performance of different types of double hollow bricks is made.

show abstract

“…In general, the heat transfer in such structures is done simultaneously by conduction, natural convection, and radiation. Exhaustive bibliographic reviews of the coupled heat transfers by convection, conduction, and/or radiation in hollow structures were made in previous works (Ait-Taleb et al 2008;Abdelbaki et al 2001;Abdelbaki and Zrikem 1999). Other studies of this problem were presented recently by del Coz Díaz et al (2008aDíaz et al ( , 2008b which treated the nonlinear heat transfer in light concrete hollow brick walls using the finite element method.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…The dimensionless time used in the simulation is 4 10 − . The convergence criterion is based on the relative changes in the variables U , V , P , θ , and r Q at the different nodes of the calculation domain: ) i j calculated in the iteration n. The numerical code was validated in previous studies (Abdelbaki and Zrikem 1999;Ait-Taleb et al 2008) by comparing its results with those available in the literature.…”

Section: List Of Symbolsmentioning

confidence: 99%

Transfer function coefficients for time varying coupled heat transfers in vertically heated hollow concrete bricks

2008

Self Cite

View full text Add to dashboard Cite

This paper describes a two step numerical procedure to determinate empirical transfer function coefficients (TFCs) for vertically heated hollow concrete bricks. For such systems TFCs cannot be generated using the analytical techniques available in the literature such as the z-transfer function method or the space state representation method because of the nonlinear local character of the heat transfer by natural convection and radiation in the air cells of the hollow concrete bricks. The first step of the procedure consists in predicting coupled heat transfer by conduction, convection, and radiation in realistic time varying conditions using a detailed numerical simulation. In the second step, the results of the simulation (the time-varying heat fluxes at the hollow brick surfaces) are used to obtain empirical transfer function coefficients using an identification technique. Transfer function coefficients are generated for three different types of hollow concrete bricks mostly used in practice. It is shown that the empirical transfer function coefficients permit fast and accurate prediction of heat transfer for thermal excitations that differ markedly from those used to generate these coefficients without solving the complex system of equations governing the coupled heat transfer mechanisms.

show abstract

Simulation nume´rique des transferts thermiques couple´sa`travers les parois alve´olaires des baˆtiments

Cited by 22 publications

References 8 publications

Theoretical and experimental study of heat transfer through a vertical partitioned enclosure: Application to the optimization of the thermal resistance

Theoretical and experimental study of heat transfer through a vertical partitioned enclosure: Application to the optimization of the thermal resistance

Numerical simulation by the FVM of coupled heat transfers by conduction, natural convection and radiation in honeycomb’s hollow bricks

Transfer function coefficients for time varying coupled heat transfers in vertically heated hollow concrete bricks

Contact Info

Product

Resources

About