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4 results on '"Laboratoire d'Energétique, Matériaux et Environnement (LEME)"'

1. An example of comparison between ISO Norm calculations and full CFD simulations of thermal performances of hollow bricks

Author

Saad Raefat, Mohammed Garoum, Najma Laaroussi, M. Ahachad, Guy Lauriat, Laboratoire d'Energétique, Matériaux et Environnement (LEME), Université Mohammed V de Rabat [Agdal], Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris-Est Marne-la-Vallée (UPEM), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), and Université Mohammed V de Rabat [Agdal] (UM5)

Subjects
Brick, Natural convection, Materials science, Finite volume method, 020209 energy, Thermal resistance, 0211 other engineering and technologies, Thermodynamics, 02 engineering and technology, Building and Construction, Mechanics, Thermal conduction, Physics::Fluid Dynamics, Thermal transmittance, [SPI]Engineering Sciences [physics], Mechanics of Materials, 021105 building & construction, Architecture, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Boussinesq approximation (water waves), Safety, Risk, Reliability and Quality, ComputingMilieux_MISCELLANEOUS, Civil and Structural Engineering
Abstract

Coupled heat transfers by conduction, convection and radiation through hollow clay bricks are numerically investigated thanks to the use of CFD simulations based on a finite volume method. The heat flow is governed by the incompressible Navier-Stokes and energy equations. On account of the small temperature differences involved, the two-dimensional model is based on the Boussinesq approximation and constant thermophysical fluid properties at the mean temperature of the internal and external temperatures of the surroundings. The brick wall surfaces are assumed gray and diffuse and, the bottom and top horizontal walls are adiabatic. Comparisons between the brick thermal performances predicted by a 1D-approximate method and by the present 2D-numerical approach are shown in the form of Tables, maps of temperature and streamfunction, and temperature profiles. The discrepancies between the two calculation methods of the design thermal resistance and thermal transmittance are discussed and their origins explained.

Published
2017

2. Benchmark solutions for natural convection flows in vertical channels submitted to different open boundary conditions

Author

Annabelle Joulin, R. Li, Shihe Xin, Jean-Paul Caltagirone, Boris Brangeon, Patrice Joubert, Charles Garnier, A. Zoubir, Y. Harnane, Didier Saury, P. Le Quéré, Eric Chénier, N. Laaroussi, Alain Bastide, Anne Sergent, Robert Eymard, Stéphane Lassue, Yassine Cherif, S. Giroux-Julien, G. Desrayaud, Laboratoire de Modélisation et Simulation Multi Echelle (MSME), Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), TCM, Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Marne-la-Vallée (UPEM)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Génie Civil et Géo-Environnement [Béthune] (LGCgE), Université d'Artois (UA), Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), Université de La Réunion (UR), Transferts, écoulements, fluides, énergétique (TREFLE), Université Sciences et Technologies - Bordeaux 1-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Analyse et de Mathématiques Appliquées (LAMA), Université Paris-Est Marne-la-Vallée (UPEM)-Fédération de Recherche Bézout-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur (LIMSI), Université Paris-Sud - Paris 11 (UP11)-Sorbonne Université - UFR d'Ingénierie (UFR 919), Sorbonne Université (SU)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris Saclay (COmUE), Centre de Thermique de Lyon (CETHIL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 (LaSIE), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Energétique, Matériaux et Environnement (LEME), Université Mohammed V de Rabat [Agdal] (UM5), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Fédération de Recherche Bézout-Université Paris-Est Marne-la-Vallée (UPEM), Université Paris Saclay (COmUE)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université - UFR d'Ingénierie (UFR 919), Sorbonne Université (SU)-Sorbonne Université (SU)-Université Paris-Saclay-Université Paris-Sud - Paris 11 (UP11), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), Université Mohammed V de Rabat [Agdal], Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Sorbonne Université - UFR d'Ingénierie (UFR 919), Sorbonne Université (SU)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Saclay (COmUE), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA, and Laboratoire des Sciences de l'Ingénieur pour l'Environnement (LaSIE)

Subjects
Natural convection, Meteorology, 020209 energy, General Engineering, 02 engineering and technology, Mechanics, Condensed Matter Physics, 01 natural sciences, Nusselt number, 010305 fluids & plasmas, Physics::Fluid Dynamics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Fluid dynamics, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], [PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph], Boundary value problem, Sensitivity (control systems), Geology, Communication channel, Return flow, Dimensionless quantity
Abstract

International audience; Comparison exercises have been carried out by different research teams to study the sensitivity of the natural convection occurring in a vertical asymmetrically heated channel to four sets of open boundary conditions. The dimensionless parameters have been chosen so that a return flow exists at the outlet. On the whole, results provided by the partners are in good agreement; benchmark solutions are then defined for each of the boundary conditions. Whilst the local and average Nusselt numbers based on the entrance temperature do not depend much on conditions applied in the aperture sections, the net fluid flow rates crossing the channel and the characteristics of the recirculation cells are highly influenced. But we proved that these modifications of flow patterns do not alter significantly the fluid flow rates leaving the channel through the exit section.

Published
2013

3. Thermal properties of a sample prepared using mixtures of clay bricks

Author

Mohammed Garoum, Najma Laaroussi, Abdelhamid Khabbazi, Abou-bakr Cherki, A. Feiz, Laboratoire d'Energétique, Matériaux et Environnement (LEME), Université Mohammed V de Rabat [Agdal], Laboratoire de Mécanique et d'Energétique d'Evry (LMEE), Université d'Évry-Val-d'Essonne (UEVE), and Université Mohammed V de Rabat [Agdal] (UM5)

Subjects
Brick, Steady state, Materials science, 020209 energy, Thermal insulating, 0211 other engineering and technologies, Clay material, 02 engineering and technology, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Heat capacity, Thermal conductivity measurement, Thermal conductivity, Energy(all), 021105 building & construction, Thermal, Building materials, 0202 electrical engineering, electronic engineering, information engineering, Transient (oscillation), Composite material, clay material, Thermal effusivity
Abstract

International audience; The measurements of thermal effusivity, thermal conductivity and specific heat of building materials such as clay used in construction have been performed using transient and steady state hot-plate methods. The estimation of these thermal characteristics is based on the simplified 1D model. Stationary and transient models are performed to estimate the thermal conductivity λ and the thermal capacity ρc, respectively. The use of a brick as a thermal insulating material requires prior knowledge of all its thermal properties. For that purpose, the authors conducted an experimental study in order to characterize the thermal properties of the sample coming from the Moroccan Slaoui's factory used to manufacture the bricks. A comparative study based on other experiments and different theoretical models was performed. The estimation errors due to the measurement on the temperature Tc was found less than 3%.The identification of the parameters is exhibiting residuals less than 0,4°C over the entire time interval. It also enables to assess the gap between the measurements and the model, which shows a good consistency. © 2013 The Authors.

Published
2013

4. Granular Cork Content Dependence of Thermal Diffusivity, Thermal Conductivity and Heat Capacity of the Composite Material/Granular Cork Bound with Plaster

Author

Abou-bakr Cherki, Benjamin Remy, Abdelhamid Khabbazi, Dominique Baillis, Laboratoire d'Energétique, Matériaux et Environnement (LEME), Université Mohammed V de Rabat [Agdal], Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'InfoRmatique en Image et Systèmes d'information (LIRIS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École Centrale de Lyon (ECL), and Université de Lyon-Université Lumière - Lyon 2 (UL2)

Subjects
Materials science, 020209 energy, Composite number, 0211 other engineering and technologies, Thermal propeties, 02 engineering and technology, Cork, engineering.material, Thermal diffusivity, Heat capacity, Energy storage, [SPI]Engineering Sciences [physics], Thermal conductivity, building materials, Energy(all), Thermal insulation, 021105 building & construction, Thermal, 0202 electrical engineering, electronic engineering, information engineering, Composite material, business.industry, plaster, false ceiling, engineering, ecological composite material, granular cork, business
Abstract

International audience; This work is a contribution to understand the thermal behavior of the composite material based on granular cork embedded in plaster. An experimental investigation of its thermal properties was mainly performed using the Flash method and the tiny Hot Plate method in steady state regime. This will allow compare its thermal properties with those of plaster for motivate the proposal that this composite will be used as false ceiling. A comparison of the energy performances of the composite material and plaster was made; it allows deducing a very interesting energy gain. The preliminary findings indicate the composite is better than plaster in term of thermal insulation, energy storage capacity and lightness.

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