A combined approach for determining the thermal performance of radiant barriers under field conditions

Miranville, Frédéric; Boyer, Harry; Lauret, Philippe; Lucas, Franck

doi:10.1016/j.solener.2007.10.012

Cited by 24 publications

(14 citation statements)

References 9 publications

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“…After a sequence of the ernpirical validation of the model, the following results are obtained for 2 days of measurements for a period of summer (March) (see Figs. [16][17][18]; the indicators of the validity of the model are the dry-air temperatures of the zones, which are representative of the global thermal behavior of the building.…”

Section: Empirical Validation Results For the Reference Modelmentioning

confidence: 99%

“…The net-radiosity method can, for example, be used for radiative heat transfers, and convective heat transfers in the air layers can be described by means of nondimensionai or algebraic correlations. study and the building simulation code are fully described in the following papers [8,18]; the model defined to predict the thermal phenomena occurring in the test cell is composed of three macrovolumes or zones, as indicated in Fig. 15, for which surface and dry-air temperatures are, among others, calculated.…”

Section: Description Of the Modelsmentioning

confidence: 99%

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A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation

Miranville

Lauret

Medina

et al. 2011

Journal of Solar Energy Engineering

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Section: Empirical Validation Results For the Reference Modelmentioning

confidence: 99%

Section: Description Of the Modelsmentioning

confidence: 99%

A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation

Miranville

Lauret

Medina

et al. 2011

Journal of Solar Energy Engineering

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“…The software is a tool dedicated to researchers and professionals. Physical models taken into account in the software are: Details of the multiple-model characteristics of CODYRUN are given in [21], the thermal model constitution in [22], the pressure airflow model in [23], the outdoor illuminance model in [40], the datastructuration and the description of the tool in [24] and CO 2 model in [25].…”

Section: Brief Description Of Codyrun Softwarementioning

confidence: 99%

Development of a new model to predict indoor daylighting: Integration in CODYRUN software and validation

Fakra¹,

Miranville²,

Boyer³

et al. 2011

Energy Conversion and Management

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Many models exist in the scientific literature for determining indoor daylighting values. They are classified in three categories: numerical, simplified and empirical models. Nevertheless, each of these categories of models are not convenient for every application. Indeed, the numerical model requires high calculation time;conditions of use of the simplified models are limited, and experimental models need not only important financial resources but also a perfect control of experimental devices (e.g. scale model), as well as climatic characteristics of the location (e.g. in situ experiment).In this article, a new model based on a combination of multiple simplified models is established. The objective is to improve this category of model. The originality of our paper relies on the coupling of several simplified models of indoor daylighting calculations. The accuracy of the simulation code, introduced into CODYRUN software to simulate correctly indoor illuminance, is then verified.Besides, the software consists of a numerical building simulation code, developed in the Physics and Mathematical Engineering Laboratory for Energy and Environment (P.I.M.E.N.T) at the University of Reunion.Initially dedicated to the thermal, airflow and hydrous phenomena in the buildings, the software has been completed for the calculation of indoor daylighting. New models and algorithms -which rely on a semidetailed approach -will be presented in this paper.In order to validate the accuracy of the integrated models, many test cases have been considered as analytical, inter-software comparisons and experimental comparisons. In order to prove the accuracy of the new model -which can properly simulate the illuminance -a confrontation between the results obtained from the software (developed in this research paper) and the major made at a given place is described in details. A new statistical indicator to appreciate the margins of errors -named RSD (Reliability of Software Degrees) -is also be defined. 2The objective is not only to develop an efficient research tool to improve visual comfort and reduce energy consumption, but also to transfer the knowledge through these decision-making aids tools to praticians and decision makers.

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“…Generally, the roof is considered as a thermal buffer between the indoor and outdoor environment. This is the part of the building most exposed to solar radiation in hot climates and considered as the weakest part of the building thermal performance [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, this type of thermal insulation allows to reduce heat transfer due to conduction, but does not reduce heat transfer by infrared radiation through the roofing. To overcome, a solution is based on the use of radiant barrier systems, which requires the presence of air layers in order to benefit a reflective radiation [12]. Based on the same approach, PCM under a flexible sheet form laminated both sides with an aluminum sheet is used in the lower part of the roof between the air layer and the drywall, both to enhance the thermal energy storage and to reduce the solar radiation through the roof system [14].…”

Section: Introductionmentioning

confidence: 99%

Empirical Validation of a Thermal Model of a Complex Roof Including Phase Change Materials

Guichard

Miranville²,

Bigot³

et al. 2015

Energies

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This paper deals with the empirical validation of a building thermal model of a complex roof including a phase change material (PCM). A mathematical model dedicated to PCMs based on the heat apparent capacity method was implemented in a multi-zone building simulation code, the aim being to increase the understanding of the thermal behavior of the whole building with PCM technologies. In order 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 has been identified for optimization. The use of the 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 the thermal predictions with measurements are found to be acceptable and are presented.

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A combined approach for determining the thermal performance of radiant barriers under field conditions

Cited by 24 publications

References 9 publications

A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation

A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation

Development of a new model to predict indoor daylighting: Integration in CODYRUN software and validation

Empirical Validation of a Thermal Model of a Complex Roof Including Phase Change Materials

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