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Your search keyword '"Elian Coment"' showing total 5 results
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5 results on '"Elian Coment"'

1. Analysis of the hot-disk technique applied to low-density insulating materials

Author

Gilles Flasquin, Dominique Baillis, Elian Coment, Remi Coquard, EC2-Modelisation (EC2MS), EC2-Modelisation, Laboratoire de Physique Statistique de l'ENS (LPS), Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Mécanique Multiéchelle pour les solides (MIMESIS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, business.industry, 020209 energy, General Engineering, 02 engineering and technology, Mechanics, Conductivity, [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermal insulation, Heat transfer, Thermal, [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph], 0202 electrical engineering, electronic engineering, information engineering, Radiative transfer, Transient (oscillation), 0210 nano-technology, business, Electrical conductor, Order of magnitude, ComputingMilieux_MISCELLANEOUS
Abstract

The hot-disk technique is a very practicable transient method of measurement of the thermal properties of solid materials. It has been applied successfully to a wide variety of materials. However, it is based on several approximations regarding the nature of the heat transfer. Notably, the probe is considered thermally neutral, and the heat transfer is assumed purely conductive. These two assumptions are questionable when dealing with low-density thermal insulators. In order to evaluate the accuracy of the method, we have generated numerically noised thermograms reproducing the thermal response that would be recorded when measurements are applied to those type of materials. Thereafter, the best-fitting procedure of the classical hot-disk technique was applied to these thermograms. The analysis of the identification results show that the presence of a radiative contribution do not affect the accuracy of the thermal properties identified. The conductivity measured actually corresponds to the equivalent conductivity. On the other hand, when the method is applied to materials with thermal inertia strongly different from the probe (≈2 order of magnitude lower or more), the accuracy of the method becomes questionable. This is notably the case for common insulators used in the building industry like polymer foam or mineral wools. The preceding conclusions have been validated by experimental measurements on a standard low-density XPS foam sample and a superinsulating silica areogel.

Published
2013

2. Building Energy Efficiency: One metrological support example to vocational education and training

Author

Jean-Remy Filtz, Patrick Nicolas, Jean-Philippe Marquié, Marie-Christine Osmont, Elian Coment, Stephane Palaprat, Nathalie Lavaurs, Franç, oise Villeneuve, Gilles Fontange, Ulla Pantsar, Markku Ollinen, Radostina Petrova, Koycho Atanasov, Wim Geuvens, Patrick Ampe, Ludwig Cardon, and Ivo Verjans

Subjects
Engineering, Engineering management, business.industry, General partnership, Vocational education, Pedagogy, Harmonization, Real estate, Energy consumption, Building design, business, Structuring, Building engineering physics
Abstract

The Energy Performance Diagnosis (EPD) has became a basic mandatory tool for addressing the needs of commercial real estate transactions. Within the framework of a European project (Leonardo da Vinci Partnership) an original contribution towards the European harmonization in education and training was undertaken. Among key expertises in various technical fields; Building design, Building physics, Energy consumption, Thermal and optical properties of materials, … Metrology expertise has been identified as one of the competencies for structuring the frame of vocational education and training. This article gives an overview on main actions performed during the project.

Published
2013

3. Estimation of local heat transfer coefficient on a cylinder : comparison between an analytical and an optimization method

Author

Elian Coment, Tahar Loulou, Denis Maillet, Laboratoire d'Ingénierie des Matériaux de Bretagne (LIMATB), Université de Bretagne Sud (UBS)-Institut Brestois du Numérique et des Mathématiques (IBNM), and Université de Brest (UBO)-Université de Brest (UBO)-Université de Brest (UBO)

Subjects
020209 energy, Applied Mathematics, Mathematical analysis, General Engineering, Experimental data, 02 engineering and technology, Heat transfer coefficient, Inverse problem, Integral transform, Temperature measurement, Computer Science Applications, Cylinder (engine), law.invention, [SPI]Engineering Sciences [physics], 020303 mechanical engineering & transports, Test case, 0203 mechanical engineering, law, Conjugate gradient method, 0202 electrical engineering, electronic engineering, information engineering, Mathematics
Abstract

International audience; This article discusses the comparison between two methods developed for estimating a local heat transfer coefficient in two-dimensional cooled cylinders. The estimation procedure in based on the solution of an inverse heat conduction problem using temperature measurements taken inside the cylinder. The first method uses in analytical solution (integral transform) of the inverse problem under investigation. The second method uses the conjugate gradient method with the adjoint state equation approach to solve the same problem. The two methods were compared by considering several numerical examples involving test cases without and with measured errors. Finally, the two methods are compared using experimental data obtained in our laboratory. The presented results shows that the two methods give approximately the same results. However the implementation seems easier for the analytical method.

Published
2005

4. Extension of the hot wire method to the characterization of stratified soils with multiple temperature analysis

Author

Jean-Christophe Batsale, Olivier Fudym, Elian Coment, R. Santander, Bruno Ladevie, Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)

Subjects
Semianalytical method, Materials science, Joule effect, Thermodynamics, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Thermal conductivity, 0203 mechanical engineering, Thermocouple, 0103 physical sciences, Cylinder, Sensitivity (control systems), 010306 general physics, [SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable, Applied Mathematics, General Engineering, Mechanics, Transfer matrix, [SDE.ES]Environmental Sciences/Environmental and Society, Computer Science Applications, Hot wire method, 020303 mechanical engineering & transports, Heat flux, Heat transfer, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], Sensitivity analysis, [SPI.GCIV.EC]Engineering Sciences [physics]/Civil Engineering/Eco-conception
Abstract

International audience; The aim of this article is to develop a practical device able to estimate a thermal conductivity profile in stratified media such as burned soils in Chile. The classical hot wire method consists of measuring the temperature response of a heat step imposed on a thin cylindrical probe by Joule effect. The main characteristic of the extension of the method consists of analyzing the two-dimensional temperature response of multiple thermo-couples equally spaced along the heating cylinder. A semianalytical method (quadrupole method) is then implemented in order to obtain a transfer matrix between the heat flux excitation and the temperature response vectors. Such method is suitable to obtain asymptotic expansions in order to investigate the sensitivity analysis and the estimation strategy. A complete two-dimensional model is used in order to define a time window in which the one-dimensional radial heat transfer assumption is valid. Some experiments and estimation results are presented in a case where the characteristic diffusion times in the radial direction are small compared to the inter-layers diffusion time.

Published
2004

5. A simple device for determining thermal effusivity of thin plates

Author

Bruno Ladevie, Jean-Christophe Batsale, Jean-Luc Battaglia, Elian Coment, Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure d'Arts et Métiers (ENSAM), and HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-Institut National de la Recherche Agronomique (INRA)

Subjects
Convection, 0209 industrial biotechnology, Materials science, [SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable, Thermodynamics, 02 engineering and technology, Mechanics, Derivative, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Signal, [SDE.ES]Environmental Sciences/Environmental and Society, [SPI.MAT]Engineering Sciences [physics]/Materials, 020901 industrial engineering & automation, Heat flux, Mechanics of Materials, Excited state, Quadrupole, Thermal, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], Physical and Theoretical Chemistry, 0210 nano-technology, Thermal effusivity, [SPI.GCIV.EC]Engineering Sciences [physics]/Civil Engineering/Eco-conception
Abstract

International audience; We measured thermal effusivity of thin plates in the longitudinal direction. This parameter is strongly correlated with lateral convection, so its determination is very difficult. Thermal quadrupole theory is presented which allows the theoretical expression of the problem to be determined. By applying a heat flux without a low-frequency component, only some characteristic times of the system are excited. A real-time method of estimation is developed by using a non-integer derivative signal. The results obtained for a copper plate are in good agreement with the literature.

Published
2002

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