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.
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e-mail: frederic.miranville@univ-reunion.fr
e-mail: philippe.lauret@univ-reunion.fr
e-mail: mmedina@ku.edu
e-mail: dimitri.bigot@univ-reunion.fr
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A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation
Frédéric Miranville,
Frédéric Miranville
Physics and Mathematical Engineering for Energy and Environment Laboratory,
e-mail: frederic.miranville@univ-reunion.fr
University of Reunion
, Reunion Island, France 97430
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Philippe Lauret,
Philippe Lauret
Physics and Mathematical Engineering for Energy and Environment Laboratory,
e-mail: philippe.lauret@univ-reunion.fr
University of Reunion
, Reunion Island, France 97430
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Mario Medina,
Mario Medina
Department of Civil, Environmental, and Architectural Engineering,
e-mail: mmedina@ku.edu
The University of Kansas
, Lawrence, KS 66045–7609
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Dimitri Bigot
Dimitri Bigot
Physics and Mathematical Engineering for Energy and Environment Laboratory,
e-mail: dimitri.bigot@univ-reunion.fr
University of Reunion
, Reunion Island, France 97430
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Frédéric Miranville
Physics and Mathematical Engineering for Energy and Environment Laboratory,
University of Reunion
, Reunion Island, France 97430e-mail: frederic.miranville@univ-reunion.fr
Philippe Lauret
Physics and Mathematical Engineering for Energy and Environment Laboratory,
University of Reunion
, Reunion Island, France 97430e-mail: philippe.lauret@univ-reunion.fr
Mario Medina
Department of Civil, Environmental, and Architectural Engineering,
The University of Kansas
, Lawrence, KS 66045–7609e-mail: mmedina@ku.edu
Dimitri Bigot
Physics and Mathematical Engineering for Energy and Environment Laboratory,
University of Reunion
, Reunion Island, France 97430e-mail: dimitri.bigot@univ-reunion.fr
J. Sol. Energy Eng. May 2011, 133(2): 021009 (13 pages)
Published Online: April 7, 2011
Article history
Received:
May 1, 2009
Revised:
December 21, 2010
Online:
April 7, 2011
Published:
April 7, 2011
Citation
Miranville, F., Lauret, P., Medina, M., and Bigot, D. (April 7, 2011). "A Simplified Model for Radiative Transfer in Building Enclosures With Low Emissivity Walls: Development and Application to Radiant Barrier Insulation." ASME. J. Sol. Energy Eng. May 2011; 133(2): 021009. https://doi.org/10.1115/1.4003730
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