Expanded polystyrene foams are one of the most widely used materials for a building’s thermal insulation. Owing to their very low density, a substantial proportion of the heat transfer is due to thermal radiation propagating through their porous structure. In order to envisage an optimization of their thermal performances, an accurate modeling of their radiative behavior is required. However, the previous studies on this subject used several drastic simplifications regarding their radiative behavior (optically thick material) or their porous morphology (homogeneous cellular material, dodecahedral cells). In this study, we propose a more accurate model based on a detailed representation of their complex morphology allowing us to predict their entire monochromatic radiative properties. We investigated the influence of the different structural parameters on these properties. We checked the validity of our model by comparing the spectral hemispherical reflectance and transmittance measured on slabs of foam samples with values predicted by our model. A good accordance was found globally.

1.
Baillis
,
D.
, and
Sacadura
,
J. F.
, 2000, “
Thermal Radiation Properties of Dispersed Media: Theoretical Prediction and Experimental Characterization
,”
J. Quant. Spectrosc. Radiat. Transf.
0022-4073,
67
, pp.
327
363
.
2.
Lee
,
S. C.
, 1989, “
Effect of Fibre Orientation on Thermal Radiation in Fibrous Media
,”
Int. J. Heat Mass Transfer
0017-9310,
32
(
2
), pp.
311
319
.
3.
Fedorov
,
A. G.
, and
Viskanta
,
R.
, 2000, “
Radiation Characteristics of Glass Foams
,”
J. Am. Ceram. Soc.
0002-7820,
83
(
11
), pp.
2769
2776
.
4.
Baillis
,
D.
,
Raynaud
,
M.
, and
Sacadura
,
J. F.
, 2000, “
Determination of Spectral Radiative Properties of Open Cell Foam Model Validation
,”
J. Thermophys. Heat Transfer
0887-8722,
14
(
2
), pp.
137
143
.
5.
Kaviany
,
M.
, and
Singh
,
B. P.
, 1992, “
Modelling Radiative Transfer in Packed Beds
,”
Int. J. Heat Mass Transfer
0017-9310,
35
(
6
), pp.
1397
1405
.
6.
Glicksman
,
L.
,
Schuetz
,
M.
, and
Sinofsky
,
M.
, 1987, “
Radiation Heat Transfer in Foam Insulation
,”
ASME J. Heat Transfer
0022-1481,
109
pp.
809
812
.
7.
Calmidi
,
V. V.
, and
Mahajan
,
R. L.
, 1999, “
The Effective Thermal Conductivity of High Porosity Fibrous Metal Foams
,”
ASME J. Heat Transfer
0022-1481,
121
, pp.
466
471
.
8.
Kuhn
,
J.
,
Ebert
,
H. P.
,
Arduini-Schuster
,
M. P.
,
Buttner
,
D.
, and
Fricke
,
J.
, 1992, “
Thermal Transport in Polystyrene and Polyurethanes Foam Insulations
,”
Int. J. Heat Mass Transfer
0017-9310,
35
(
7
), pp.
1795
1801
.
9.
Placido
,
E.
,
Arduini-Schuster
,
M. C.
, and
Kuhn
,
J.
, 2005, “
Thermal Properties Predictive Model for Insulating Foams
,”
Infrared Phys. Technol.
1350-4495,
46
, pp.
219
231
.
10.
Coquard
,
R.
, and
Baillis
,
D.
, 2006, “
Modeling of Heat Transfer in Low-Density EPS Foams
,”
ASME J. Heat Transfer
0022-1481,
128
(
6
), pp.
538
549
.
11.
Draine
,
B. T.
, and
Flatau
,
P. J.
, 1994, “
Discrete Dipole Approximations for Scattering Calculations
,”
J. Opt. Soc. Am. A
0740-3232,
11
, pp.
1491
1499
.
12.
Siegel
,
R.
, and
Howell
,
J. R.
, 1992,
Thermal Radiation Heat Transfer
,
3rd ed.
,
Hemisphere
,
Washington DC
.
13.
Coquard
,
R.
, and
Baillis
,
D.
, 2004, “
Radiative Characteristics of Beds of Spheres Containing an Absorbing and Scattering Medium
,”
J. Thermophys. Heat Transfer
0887-8722,
18
(
2
), pp.
178
186
.
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