Study on transient heat transfer through multilayer thermal insulation: Numerical analysis and experimental investigation

Mavromatidis, Lazaros Elias; Michel, Pierre; Mankibi, Mohamed El; Santamouris, M.

doi:10.1007/s12273-010-0018-z

Cited by 30 publications

(32 citation statements)

References 19 publications

(21 reference statements)

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“…Some non-conventional insulation materials that show low environmental impact can also be found in literature. Mavromatidis et al [183] experimentally evaluated the thermal behavior of two different multilayer fibrous insulations for building applications. A GHB apparatus was used to measure the heat transfer through the samples.…”

Section: New or Non-conventional Insulation Materialsmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

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The experimental characterization of the overall thermal transmittance of homogeneous, moderately-and non-homogeneous walls, windows, and construction elements with innovative materials is very important to predict their thermal performance. It is also important to evaluate if the standard calculation methods to estimate the U-value of new and existing walls can be applied to more complex configurations, since the correct estimation of this value is a critical requirement when performing building energy simulations or energy audit. This paper provides a survey on the main methods to measure the thermal transmittance and thermal behaviour of construction elements, considering laboratory conditions and in-situ non-destructive measurements. Five methods are described: the heat flow meter (HFM); the guarded hot plate (GHP); the hot box (HB), considering the guarded HB (GHB) and the calibrated HB (CHB); and the infrared thermography (IRT). Then, previous studies dedicated to the assessment of the thermal performance of different heavy-and light-weight walls are discussed. Particular attention is devoted to the measurement of the U-value of nonhomogeneous walls, including the effect of thermal bridging caused by steel framing or mortar joints, and the presence of PCMs or new insulation materials in the configuration of the walls. hot box; calibrated hot box; infrared thermography. Highlights: -Review on the main methods to measure the U-value of non-homogeneous walls. -Methods: heat flow meter, guarded hot plate, guarded and calibrated hot box, infrared thermography. -Standards framework and discussion of the main advantages and drawbacks of each method. -Description of methodologies and working principles of laboratory and in-situ measurements. -Measurement of the thermal transmittance of different heavy-and light-weight walls.

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Section: New or Non-conventional Insulation Materialsmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

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“…The hot-disk technique is a transient plane source measurement method, developed by Gustafsson and co-worker [32,33] in the early 1990s and is now widely used for the determination of the thermophysical properties of building materials [34][35][36][37]. In this study, the experiments are performed with the patented Hot Disk TPS 1500 Thermal Constants Analyzer test system.…”

Section: Principles Of Measurement: Hot-disk and Heating-film Methodsmentioning

confidence: 99%

Transient Thermal Response of Lightweight Cementitious Composites Made with Polyurethane Foam Waste

2012

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International audienceThe development of low-cost lightweight aggregate (LWA) mortars and concretes presents many advantages, especially in terms of lightness and thermal insulation performances of structures. Low-cost LWA mainly comes from the recovery of vegetal or plastic wastes. This article focuses on the characterization of the thermal conductivity of innovative lightweight cementitious composites made with fine particles of rigid polyurethane (PU) foam waste. Five mortars were prepared with various mass substitution rates of cement with PU-foam particles. Their thermal conductivity was measured with two transient methods: the heating-film method and the hot-disk method. The incorporation of PU-foam particles causes a reduction of up to 18 % of the mortar density, accompanied by a significant improvement of the thermal insulating performance. The effect of segregation on the thermal properties of LWA mortars due to the differences of density among the cementitious matrix, sand, and LWA has also been quantified. The application of the hot-disk method reveals a gradient of thermal conductivity along the thickness of the specimens, which could be explained by a non-uniform repartition of fine PU-foam particles and mineral aggregates within the mortars. The results show a spatial variation of the thermal conductivity of the LWA mortars, ranging from 9 % to 19 %. However, this variation remains close to or even lower than that observed on a normal weight aggregate mortar. Finally, a self-consistent approach is proposed to estimate the thermal conductivity of PU-foam cement-based composites

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“…The model proposed by Farnworth [18] and evaluated by Du et al [19] and Mavromatidis et al [20] is based on the two-flux approach by Schuster and Schwarzschild for radiative flux and negligible scattering of radiation by the fibers. The radiative heat transfer can be expressed as…”

Section: Schuster and Schwarzschild Approximationmentioning

confidence: 99%

“…(10) and repeat the above steps. Mavromatidis et al [20] showed that the model provides good agreement in multilayer thermal insulators.…”

Section: Schuster and Schwarzschild Approximationmentioning

confidence: 99%

Comparison of Models for Heat Transfer in High-Density Fibrous Insulation

Carvajal¹,

Garboczi

Zarr

2019

J. RES. NATL. INST. STAN.

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This study evaluated different models for calculating the effective thermal conductivity of fibrous insulation by comparing predicted values with certified values of Standard Reference Material 1450c, Fibrous Glass Board. This comparison involved the coupled effects of radiation and conduction heat transfer. To support these comparisons, the fiber diameter distribution was measured using X-ray computed tomography, and this distribution was used in several heat transfer models considered in this paper. For the evaluation of the radiative heat transfer, the diffusion approximation, the Schuster-Schwarzschild approximation, and the Milne-Eddington approximation were considered. The conduction of the gas and the fibers was treated by the kinetic theory and a semi-empirical model, respectively. Two models were considered for the evaluation of the radiative properties: the large specular reflecting approach and the application of Mie theory for media composed of infinite cylinders.

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Study on transient heat transfer through multilayer thermal insulation: Numerical analysis and experimental investigation

Cited by 30 publications

References 19 publications

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Transient Thermal Response of Lightweight Cementitious Composites Made with Polyurethane Foam Waste

Comparison of Models for Heat Transfer in High-Density Fibrous Insulation

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