15 results on '"Dimitri Bigot"'
Search Results
2. Technological Review of Tubular Daylight Guide System from 1982 to 2020
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Harry Boyer, Dimitri Bigot, Bruno Malet-Damour, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), Université de La Réunion (UR), and Malet-Damour, Bruno
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[PHYS]Physics [physics] ,Engineering ,light tube ,Light pipe ,business.industry ,020209 energy ,Mechanical engineering ,Light guide ,02 engineering and technology ,010501 environmental sciences ,Skylight ,light guide ,01 natural sciences ,[PHYS] Physics [physics] ,Solar light ,technological review ,0202 electrical engineering, electronic engineering, information engineering ,Daylight ,business ,Light tube ,Daylighting ,0105 earth and related environmental sciences - Abstract
T.D.G.S., "Tubular Daylight Guidance Systems", are natural lighting processes based on the transport of light. In 1990, they were judged by Littlefair as the most innovative technology in daylighting [1]. From 1982 to 2020, this paper is a state of the art on the different processes of tubular daylight guide systems. The key words used to carry out the census are: light pipe; light tube; light guide; sun pipes; solar pipes; solar light pipes; daylight pipes; tubular skylight; sun scoop; tubular daylighting device; tubular daylight guide systems; mirrored light pipe. A classification by type of process is proposed (collection, transport or diffusion) for each technology identified in the literature., Les D.G.L.T., "Dispositifs de Guides Lumineux Tubulaires", sont des processus d'éclairement naturel basés sur le transport de la lumière. En 1990, ils ont été jugés par Littlefair comme la technologie la plus innovante en matière d'éclairement naturel [1]. Cet article fait le point sur les différents procédés des systèmes tubulaires de guidage de la lumière du jour de 1982 à 2020. Les mots clés utilisés pour effectuer le recensement sont : conduit de lumière ; tube de lumière ; guide de lumière ; tube solaire ; conduit de lumière du jour ; puits de lumière tubulaire ; conduit de lumière réfléchissant ; systèmes tubulaires de guidage de la lumière du jour. Une classification par type de procédé est proposée (collecte, transport ou diffusion) pour chaque technologie identifiée dans la littérature.
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- 2020
3. Description of phase change materials (PCMs) used in buildings under various climates: A review
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Lisa Liu, Nadia Hammami, Lionel Trovalet, Dimitri Bigot, Jean-Pierre Habas, and Bruno Malet-Damour
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Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,Electrical and Electronic Engineering - Published
- 2022
4. Phase Change Materials for building envelopes in Reunion Island, France
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L. Liu, Bruno Malet-Damour, L. Trovalet, and Dimitri Bigot
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History ,Phase change ,Earth science ,Geology ,Computer Science Applications ,Education - Abstract
This study is being conducted to evaluate the effects of Phase Change Materials (PCM) on thermal comfort in buildings in Reunion Island. Experimental and numerical approaches are used to determine the criteria for the integration of bio-based PCM. A full-scale platform is divided into two rooms, where a layer of PCM is applied to one surface of the test room. Results show that the application of PCM delays the temperature rises and its maximum is reduced by up to 4 degrees. Finally, the experimental results are compared to those of a Dynamic Thermal Simulation (DTS) program to evaluate the ability of such programs to predict the thermal behavior of the building with and without PCM.
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- 2021
5. A complex roof incorporating phase change material for improving thermal comfort in a dedicated test cell
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Frédéric Miranville, Stéphane Guichard, Karim Beddiar, Harry Boyer, Dimitri Bigot, Bruno Malet-Damour, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), Université de La Réunion (UR), Laboratoire de Mécanique et Technologie (LMT), and École normale supérieure - Cachan (ENS Cachan)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)
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Engineering ,Renewable Energy, Sustainability and the Environment ,business.industry ,020209 energy ,Psychrometrics ,Building energy ,Thermal comfort ,Mechanical engineering ,02 engineering and technology ,Energy consumption ,Thermal energy storage ,7. Clean energy ,Phase-change material ,[SPI]Engineering Sciences [physics] ,13. Climate action ,Thermal ,0202 electrical engineering, electronic engineering, information engineering ,business ,Roof ,ComputingMilieux_MISCELLANEOUS ,Simulation - Abstract
The use of phase change materials (PCMs) as a building integrated thermal storage may contribute to improving building energy performances. This article focuses on the integration of PCMs in the roof with a non-ventilated air layer, in order to assess thermal performances of a dedicated test cell, especially for thermal comfort. An experimental equipment was set up at Reunion Island under tropical and humid climatic conditions. A mathematical model, based on the apparent heat capacity method is used to predict the actual impact of PCMs on energy consumption as well as thermal comfort. Once the comparisons are performed with simulations, the use of the psychrometric chart, Predicted Mean Vote and Predicted Percentage of Dissatisfied indexes, shows that in the tested configurations, thermal comfort can be improved. Indeed, as well as to enhance the thermal energy storage, the given configuration also reduce the solar radiation through the roof, due to the reflective properties of PCMs panel surfaces. A positive effect on inside air temperature of the full-scale experimental test cell is particularly observed.
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- 2017
6. Study of tubular daylight guide systems in buildings: Experimentation, modelling and validation
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Stéphane Guichard, Bruno Malet-Damour, Harry Boyer, Dimitri Bigot, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), and Université de La Réunion (UR)
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Engineering ,Energy management ,020209 energy ,0211 other engineering and technologies ,Context (language use) ,02 engineering and technology ,7. Clean energy ,[SPI]Engineering Sciences [physics] ,021105 building & construction ,11. Sustainability ,0202 electrical engineering, electronic engineering, information engineering ,Performance prediction ,Daylight ,Electrical and Electronic Engineering ,Protocol (object-oriented programming) ,ComputingMilieux_MISCELLANEOUS ,Simulation ,Civil and Structural Engineering ,business.industry ,Mechanical Engineering ,Building and Construction ,Energy consumption ,Systems engineering ,business ,Daylighting ,Generator (mathematics) - Abstract
In a concerning global energy context, the construction industry must be able to respond both in terms of energy management and the comfort of its buildings occupants. In this context, innovative devices using daylighting can provide an obvious answer. The Tubular Devices Guide Systems (TDGS) are innovative daylighting processes based on light transport. They offer a real response to the diurnal energy consumption (frequently in tertiary). However, today's design will make tomorrow's building. This is why it is necessary to better adjust our prediction tools to optimize the use of these technologies and their coupling to active processes (artificial lighting). The literature reveals a disparity in performance prediction tools for light pipes. Two causes are targeted: the adjustment of semi-empirical models and their accuracy. This article offers some solutions to both problems. We propose a new form of model (improved accuracy) associated with a generalized modelling protocol (response to the adjustment) through a model generator named HEMERA. Our approach is organized around a Galilean sequence, i.e., we rely on observation and results of an experimental study in real weather conditions to better understand the phenomena and validate the developed model. Energy autonomy and user comfort in the building are at the heart of our concern, and we will provide evidence to validate the use of TDGS in buildings. In this context, we propose an energy equivalence between the light pipe and artificial lighting.
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- 2016
7. Heating or Cooling Buildings with PV Walls in Reunion Island
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Frédéric Miranville, Stéphane Guichard, Edouard Lebon, Aurélien Jean, and Dimitri Bigot
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Engineering ,business.industry ,Electricity grid ,Photovoltaic system ,Microclimate ,General Medicine ,Electricity ,Building-integrated photovoltaics ,business ,Greenhouse effect ,Building simulation ,Civil engineering ,Renewable energy - Abstract
In Reunion Island, many buildings have been equipped with PV panels on their roofs in order to produce electricity. These PV systems were built to increase the penetration of renewable energies in the public electricity grid and so reduce greenhouse effect gases emissions. This type of installation was designed just in order to produce electricity but many works have shown that PV systems integrated to walls can also cool or heat the buildings. This paper presents how PV systems integrated to building can be used to help meeting energy needs in two microclimates of the island by cooling or heating the building where it is installed. To show this, a building simulation code able to model BIPV buildings is used.
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- 2015
8. Photovoltaic electricity production in a residential house on Réunion
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Dragan Cvetković, Frédéric Miranville, Slobodan Djordjević, Alexandre Patou Parvedy, Dimitri Bigot, Danijela Nikolić, and Milorad Bojic
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lcsh:GE1-350 ,Engineering ,General Computer Science ,Meteorology ,business.industry ,Electric potential energy ,Photovoltaic system ,Civil engineering ,Port (computer networking) ,photovoltaic ,Indian ocean ,Electric energy ,General Energy ,lcsh:Energy conservation ,EnergyPlus ,lcsh:TJ163.26-163.5 ,electrical energy ,residential house ,business ,Roof ,lcsh:Environmental sciences ,Photovoltaic electricity - Abstract
In this paper, the electrical energy generation of photovoltaic (PV) arrays is discussed for three cities on the island of Réunion (the Republic of France) located in the Indian Ocean. Each PV array has a different orientation as it is placed at different parts of the roof of a residential house that supposedly is a sustainable building. The electrical energy generation is obtained by using EnergyPlus software and measured solar radiation data. The highest generation of electric energy is found for the PV array located at the north roof surface. The generation of electric energy at the east-facing PV array is larger than that at the west-facing PV array. The electrical energy generation for the city of Le Port on the coast is higher than that for the cities of Cilao, and Plaine des Cafres that are located in the mountains of Réunion.
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- 2013
9. Evaluation of the thermal resistance of a roof-mounted multi-reflective radiant barrier for tropical and humid conditions: Experimental study from field measurements
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Stéphane Guichard, Harry Boyer, Dimitri Bigot, Jean-Philippe Praene, Ali Hamada Fakra, Frédéric Miranville, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), and Université de La Réunion (UR)
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Radiant barrier ,Engineering ,Reflective insulation ,Field (physics) ,Experimental evaluation ,020209 energy ,Thermal resistance ,Airflow ,0211 other engineering and technologies ,FOS: Physical sciences ,02 engineering and technology ,Physics - General Physics ,Air layer ,021105 building & construction ,Thermal ,0202 electrical engineering, electronic engineering, information engineering ,Forensic engineering ,Electrical and Electronic Engineering ,Roof ,Civil and Structural Engineering ,business.industry ,Mean method ,Mechanical Engineering ,Dynamic data ,Building and Construction ,General Physics (physics.gen-ph) ,[PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] ,[SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] ,business ,Marine engineering - Abstract
This paper deals with the experimental evaluation of a roof-mounted multi-reflective radiant barrier (MRRB), installed according to the state of the art, on a dedicated test cell. An existing experimental device was completed with a specific system for the regulation of the airflow rate in the upper air layer included in a typical roof from Reunion Island. Several experimental sequences were conducted to determine the thermal resistance of the roof according to several parameters and following a specific method. The mean method, well known in international standards (ISO 9869 - 1994) for the determination of the thermal resistance using dynamic data, was used. The method was implemented in a building simulation code in order to allow the determination of the thermal indicator automatically. Experimental results are proposed according to different seasonal periods and for different values of the airflow rate in the upper air layer., cited By (since 1996) 1
- Published
- 2012
10. Optimizing performances of photovoltaics in Reunion Island-tilt angle
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Dimitri Bigot, Jasna Radulović, Frédéric Miranville, Milorad Bojić, and Alexandre Parvedy-Patou
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Meteorology ,Renewable Energy, Sustainability and the Environment ,business.industry ,020209 energy ,Photovoltaic system ,02 engineering and technology ,010501 environmental sciences ,Condensed Matter Physics ,Solar energy ,01 natural sciences ,7. Clean energy ,Automotive engineering ,Grid parity ,Electronic, Optical and Magnetic Materials ,Photovoltaic thermal hybrid solar collector ,Stand-alone power system ,Electricity generation ,13. Climate action ,Photovoltaics ,0202 electrical engineering, electronic engineering, information engineering ,Grid-connected photovoltaic power system ,Environmental science ,Electrical and Electronic Engineering ,business ,0105 earth and related environmental sciences - Abstract
As in Reunion Island, France, around 61% of electricity is produced by using coal and fuel oil with high greenhouse emissions, it is beneficial to the environment to produce electricity from solar energy. Therefore, there is a large push to generate electricity from solar energy by use of photovoltaic (PV) arrays. However, it is important to have high efficiency of electricity generation, that is, to locate PV arrays in an optimal direction. The investigated PV systems may take 1, 2, 4, and 12 tilts per year. For the PV arrays facing the north-south direction, this paper reports investigations of their optimum tilts and the maximum amounts of generated electricity. The investigated PV arrays are located in the towns of Saint-Benoit, Les Avirons, Piton Saint-Leu, and Petite-France in Reunion Island. To obtain optimal tilt of the PV arrays for electricity production from solar energy, EnergyPlus software and GenOpt software are used with Hooke-Jeeves optimization routine. For the investigated PV arrays, the percentage gains in energy, exergy, avoided fossil energy, and the percentage decrease in CO2 emission are around 5% when compared with that of the PV array that takes only one optimum tilt per year. x-audience © 2011 John Wiley & Sons, Ltd.
- Published
- 2011
11. A simple evaluation of global and diffuse luminous efficacy for all sky conditions in tropical and humid climate
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Frédéric Miranville, Ali Hamada Fakra, Harry Boyer, Dimitri Bigot, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), and Université de La Réunion (UR)
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Meteorology ,luminous efficacity ,020209 energy ,media_common.quotation_subject ,FOS: Physical sciences ,02 engineering and technology ,solar illuminance ,Solar irradiance ,Luminance ,0202 electrical engineering, electronic engineering, information engineering ,media_common ,Renewable Energy, Sustainability and the Environment ,Illuminance ,CODYRUN ,021001 nanoscience & nanotechnology ,Physics - Atmospheric and Oceanic Physics ,Overcast ,13. Climate action ,Sky ,Atmospheric and Oceanic Physics (physics.ao-ph) ,[PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] ,[SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] ,Radiance ,Environmental science ,0210 nano-technology ,Luminous efficacy ,Humid climate - Abstract
International audience; This paper presents initial values of global and diffuse luminous efficacy at Saint-Pierre (Reunion Island). Firstly, data used were measured for a period of 6 months, from February to June 2008. During this period, all defined day-types have been studied (clear, cloudy and intermediate). Generally, the meteorological database of Reunion does not contain information for illuminance values. On the other hand, the local meteorological center has a 60-years-old database for solar irradiance (W.m-2). So it is important to determine Luminous Efficacy in order to find illuminance from solar irradiance (or luminance from solar radiance). The measured data were analyzed, and empirical constant models were developed and presented in this paper in order to determine luminous efficacy under different sky conditions. A comparison between these empirical constants (models) and existing models has been made. The method used to define sky conditions (overcast, intermediate and clear) and day-types characterization as well as classification will be presented in this work.
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- 2011
12. A nodal thermal model for photovoltaic systems: Impact on building temperature fields and elements of validation for tropical and humid climatic conditions
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Frédéric Miranville, Harry Boyer, Dimitri Bigot, and Ali Hamada Fakra
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Convection ,Meteorology ,business.industry ,Mechanical Engineering ,Photovoltaic system ,Building and Construction ,Thermal conduction ,Heat transfer ,Thermal ,Environmental science ,Electricity ,Electrical and Electronic Engineering ,business ,Roof ,Building envelope ,Civil and Structural Engineering ,Marine engineering - Abstract
This article deals with both an experimental study and a numerical model of the thermal behaviour of a building whose roof is equipped with photovoltaic panels (PV panels). The aim of this study is to show the impact of the PV panels in terms of level of insulation or solar protection for the building. Contrary to existing models, the one presented here will allow us to determine both the temperature field of the building and the electric production of the PV array. Moreover, an experimental study has been conducted in La Reunion Island, where the climate is tropical and humid, with a strong solar radiation. In such conditions, it is important to minimise the thermal load through the roof of the building. The thermal model is integrated in a building simulation code and is able to predict the thermal impact of PV panels installed on buildings in several configurations and also their production of electricity. Basically, the PV panel is considered as a complex wall within which coupled heat transfer occurs. Conduction, convection and radiation heat transfer equations are solved simultaneously to simulate the global thermal behaviour of the building envelope including the PV panels; this is an approach we call ‘ integrated modelling ’ of PV panels. The experimental study is used to give elements of validation for the numerical model and a sensitivity analysis has been run to put in evidence the governing parameters. It has been shown that the radiative properties of the PV panel have a great impact on the temperature field of the tested building and the determination of these parameters has to be taken with care.
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- 2009
13. Empirical Validation of a Thermal Model of a Complex Roof Including Phase Change Materials
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Stéphane Guichard, Teddy Libelle, Harry Boyer, Dimitri Bigot, Bruno Malet-Damour, Frédéric Miranville, IRISE/CESI, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), and Université de La Réunion (UR)
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model validation ,Work (thermodynamics) ,Control and Optimization ,Computer science ,020209 energy ,phase change materials (PCMs) ,FOS: Physical sciences ,Energy Engineering and Power Technology ,Mechanical engineering ,Physics - Classical Physics ,02 engineering and technology ,building thermal simulation ,model optimization ,010501 environmental sciences ,lcsh:Technology ,01 natural sciences ,Set (abstract data type) ,Thermal ,0202 electrical engineering, electronic engineering, information engineering ,Code (cryptography) ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Roof ,0105 earth and related environmental sciences ,Parametric statistics ,lcsh:T ,Renewable Energy, Sustainability and the Environment ,Classical Physics (physics.class-ph) ,Phase change materials ,Phase-change material ,[PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] ,Energy (miscellaneous) - Abstract
International audience; This paper deals with the empirical validation of a building thermal model using a phase change material (PCM) in a complex roof. A mathematical model dedicated to phase change materials based on the heat apparent capacity method was implemented in a multi-zone building simulation code, the aim being to increase understanding of the thermal behavior of the whole building with PCM technologies. To empirically validate the model, the methodology is based both on numerical and experimental studies. A parametric sensitivity analysis was performed and a set of parameters of the thermal model have been identified for optimization. The use of a generic optimization program called GenOpt ® coupled to the building simulation code enabled to determine the set of adequate parameters. We first present the empirical validation methodology and main results of previous work. We then give an overview of GenOpt ® and its coupling with the building simulation code. Finally, once the optimization results are obtained, comparisons of thermal model of PCM with measurements are found to be acceptable and are presented.
- Published
- 2015
14. Heat Transfer in Buildings: Application to Solar Air Collector and Trombe Wall Design
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Didier Calogine, Aurélien Jean, Stéphane Guichard, Harry Boyer, Dimitri Bigot, Ali Hamada Fakra, Ted Soubdhan, I. Ingar, and Frédéric Miranville
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Steady state ,business.industry ,Computer science ,020209 energy ,0211 other engineering and technologies ,Mechanical engineering ,02 engineering and technology ,Computational fluid dynamics ,7. Clean energy ,Dynamic simulation ,Software ,021105 building & construction ,HVAC ,Thermal ,Heat transfer ,0202 electrical engineering, electronic engineering, information engineering ,Trombe wall ,business - Abstract
The aim of this paper is to briefly recall heat transfer modes and explain their integration within a software dedicated to building simulation (CODYRUN). Detailed elements of the validation of this software are presented and two applications are finally discussed. One concerns the modeling of a flat plate air collector and the second focuses on the modeling of Trombe solar walls. In each case, detailed modeling of heat transfer allows precise understanding of thermal and energetic behavior of the studied structures. Recent decades have seen a proliferation of tools for building thermal simulation. These applications cover a wide spectrum from very simplified steady state models to dynamic simulation ones, including computational fluid dynamics modules (Clarke, 2001). These tools are widely available in design offices and engineering firms. They are often used for the design of HVAC systems and still subject to detailed research, particularly with respect to the integration of new fields (specific insulation materials, lighting, pollutants transport, etc.).
- Published
- 2011
15. A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation
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Dimitri Bigot, Mario A. Medina, Frédéric Miranville, Philippe Lauret, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), and Université de La Réunion (UR)
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Transferencia radiativa ,Radiant barrier ,Transfert radiatif ,Islas Océano Indico ,0211 other engineering and technologies ,Iles Océan Indien ,02 engineering and technology ,Blackbody ,Cuerpo negro ,Low emissivity ,Thermal insulation ,Heat transfer ,021105 building & construction ,Bâtiment ,0202 electrical engineering, electronic engineering, information engineering ,Radiative transfer ,Buildings ,Ile Réunion ,Simulation système ,Isolation thermique ,Roof ,ComputingMilieux_MISCELLANEOUS ,Corps noir ,Transfert chaleur ,Edificio ,Reunion island ,Mechanics ,Simulación sistema ,Transferencia térmica ,Thermal radiation ,[SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] ,System simulation ,Materials science ,Isla Reunión ,Meteorology ,020209 energy ,Aislamiento térmico ,Energy Engineering and Power Technology ,Matériau à faible emissivité ,Indian Ocean Islands ,Experimental test ,Low-emissivity material ,Verificación experimental ,Emissivité ,Emissivity ,Renewable Energy, Sustainability and the Environment ,business.industry ,Emisividad ,Vérification expérimentale ,[PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] ,Toiture ,business ,Techumbre - Abstract
This paper deals with a simplified model of radiative heat transfer in building enclosures with low emissivity walls. The approach is based on an existing simplified model, well known and used in building multizone simulation codes, for the long wave exchanges in building enclosures. This method is simply extended to the case of a cavity including a very low emissivity wall, and it is shown that the obtained formalism is similar to the one used in the case of the based model, convenient for enclosures with only black walls (blackbody assumption). The proposed model has been integrated into a building simulation code and is based on simple examples; it is shown that intermediate results between the imprecise initial simple model and the more precise detailed model, the net-radiosity method, can be obtained. Finally, an application of the model is made for an existing experimental test cell including a radiant barrier insulation product, well used in Reunion Island for thermal insulation of roofs. With an efficacy based on the very low emissivity of their surfaces and the consequent decrease in radiative heat transfer through the wall in which they are included, the proposed simplified model leads to results very close to those of the reference method, the net-radiosity method.
- Published
- 2011
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