Radiative Properties of High and Low Density Fiberglass Insulation in the                4-38.5 km Wavelength Region

Roux, J. A.

doi:10.1177/1097196303035236

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…As the mean temperature is 283K, from Wien's displacement law [Siegel, and Howell (2002)], the wavelength from which the largest amount of radiative energy is transmitted is 10 m    . Therefore, the radiative properties are the same as the properties proposed by Roux [Roux (2003)] in this wavelength. A boundary surface emissivity of 0.9 (as declared by Netzsch, the manufacturer of the HFM apparatus) is used for these computations.…”

Section: Computational Proceduresmentioning

confidence: 77%

A New Method for Numerical Modeling of Heat Transfer in Thermal Insulations Products

Veiseh¹

2012

Effective Thermal Insulation - The Operative Factor of a Passive Building Model

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Section: Computational Proceduresmentioning

confidence: 77%

A New Method for Numerical Modeling of Heat Transfer in Thermal Insulations Products

Veiseh¹

2012

Effective Thermal Insulation - The Operative Factor of a Passive Building Model

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Numerical modeling and experimental study of heat transfer in ceramic fiberboard

Liu

Wang

2013

Textile Research Journal

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Ceramic fiber products form a class of excellent refractory insulation materials. The increasing usage of fibrous materials has given further impetus for research into their heat transfer characteristics. In order to obtain more accurate estimations of effective thermal conductivity, this paper proposes a numerical model with a random structure to estimate the effective thermal conductivity of ceramic fiberboard under various bulk densities and temperatures. The present model is able to sort out individual contributions of conduction and radiation heat transfer mechanisms in these materials. The numerical simulation results are in good agreement with measured values obtained by a guarded hot plate (GHP) apparatus, indicating that the adopted modeling approach can be extended to other insulation systems.In recent years, energy saving and emission reduction have remained very difficult tasks. To meet the requirements of the current energy situation, insulating media have been increasingly used. The most widely used categories of insulating materials are inorganic fibrous and organic foamy products. Organic foamy materials cannot be used in high temperature conditions, due to their poor resistance to high temperatures and the increased hazards in case of fire. As a result, only fibrous materials are considered in this paper. Among the fibrous materials, ceramic fiberboards have received special attention due to their excellent properties, such as light weight, high temperature resistance, low thermal capacity, good heat insulation performance, nontoxicity, etc. Because of these merits, ceramic fiberboard can not only be used as thermal and acoustic insulation but also for fire protection. The thermal performance of ceramic fiberboard is based on the air trapped between fibers, resulting in its low thermal conductivity. Therefore, ceramic fiberboard is better than insulation brick and other traditional refractories in energy saving, which means it has been widely used in various fields.The increasing usage of fibrous materials has given further impetus for research into their heat transfer characteristics. Early studies reported the relative magnitudes of the different modes of heat transfer in planar fibrous materials. 1-3 Many investigations have focused on the behavior and modeling of heat transfer in fibrous materials, for example, radiative heat transfer through porous insulations, 4 radiation properties in fibrous insulations, 5-7 semi-empirical modeling of heat transfer in dry mineral fiber insulations, 8 heat and mass transfer in fibrous insulations, 9 numerical modeling of radiative transfer in fibrous media, 10 approximate formulation for coupled conduction and radiation through a medium with arbitrary optical thickness, 11 and combined radiation and conduction heat transfer in high temperature fiber thermal insulation. 12 More recently, a number of investigations have been carried out for modeling heat transfer in fibrous materials. [13][14][15][16][17][18][19] However, most of the reported methods are onl...

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Determination of the Air/Fiber Conductivity of Mineral Wool Insulations in Building Applications Using Nonlinear Estimation Methods

Veiseh

Hakkaki-Fard

Kowsary

2009

Journal of Building Physics

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The limitation of the experimental methods in determining the thermal conductivity due to the air/fiber conduction in mineral wools leads the use of inverse parameter estimation techniques. However, in some circumstances, the convergence of the inverse solution is impossible due to the correlation of the involving parameters and the existing noises in measurement data. In this article two relations are obtained to model thermal conductivity of the air/fiber conduction k(T, ), for glass fiber and rock wool insulations in temperatures between 08C and 208C, commonly encountered in building applications. Levenberg Marquardt's (LM) method is used for estimating of the unknown parameters in this article. Considering the nonlinear nature of the inverse problem and the correlation of the involving parameters and the existing noises in measurement data, the convergence of the problem is acceptable. The results obtained by the estimated parameters agree extremely well with experimental measurements of the Heat Flow Meter (HFM) apparatus conducted at the Building and Housing Research Center (BHRC).

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Radiative Properties of High and Low Density Fiberglass Insulation in the 4-38.5 km Wavelength Region

Cited by 3 publications

References 11 publications

A New Method for Numerical Modeling of Heat Transfer in Thermal Insulations Products

A New Method for Numerical Modeling of Heat Transfer in Thermal Insulations Products

Numerical modeling and experimental study of heat transfer in ceramic fiberboard

Determination of the Air/Fiber Conductivity of Mineral Wool Insulations in Building Applications Using Nonlinear Estimation Methods

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