Three-dimensional numerical simulation of conduction, natural convection, and radiation through alveolar building walls

Ouakarrouch, Mohamed; Azhary, Karima El; Laaroussi, Najma; Garoum, Mohammed; Feiz, Amir Ali

doi:10.1016/j.cscm.2019.e00249

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…(1)). As soon as the steady-state regime is established, the thermal conductivity of the sample is calculated by equation (2).…”

Section: Hot Plate Methods In a Steady-state Regimementioning

confidence: 99%

“…The thermal insulation of building envelopes is one of effective techniques adopted to ensure thermal comfort and to save climate change while reducing greenhouse gas emissions. The materials commonly used in construction characterized by low thermal insulation properties [2,3], which has attracted the interest of many researchers to develop new bio-composite materials by incorporating natural and sustainable additives into different matrices. These additives have excellent mechanical, thermal and acoustical properties [4].…”

Section: Introductionmentioning

confidence: 99%

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Thermal characterization of a new bio-composite building material based on plaster and waste chicken feathers

Ouakarrouch

Laaroussi

Garoum

2020

Renew. Energy Environ. Sustain.

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The building materials used in Morocco characterized by a low thermal resistance which generates a huge expense in terms of energy consumption. Promoting new sustainable construction and insulation materials become a necessity. This research study aimed to develop the thermal proprieties of plaster building material by mixing it with waste chicken feathers (WCF) in order to be used as wall exterior rendering. For the purpose of determining the thermal properties of the biocomposite material Plaster-WCF, several experimental measurements of thermophysical proprieties had been performed in order to determine apparent density, thermal conductivity, and thermal diffusivity using the hot plate method in steady-state regime and the Flash method, respectively. The results showed that the addition of waste chicken feathers leads to a remarkable reduction in apparent density of about 12.3%, the thermal conductivity and diffusivity have been reduced by about 30.2% and 18%, respectively, which shows the interest of using this biocomposite material in the construction buildings in order to ensure thermal comfort and reduce greenhouse gas emissions (CO2).

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“…(1)). As soon as the steady-state regime is established, the thermal conductivity of the sample is calculated by equation (2).…”

Section: Hot Plate Methods In a Steady-state Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal characterization of a new bio-composite building material based on plaster and waste chicken feathers

Ouakarrouch

Laaroussi

Garoum

2020

Renew. Energy Environ. Sustain.

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“…With the outgoing radiation 𝐽 the heat flux 𝑞 𝑅 is determined using (8). This is employed for the heat flux boundary condition on the side walls of the cavity.…”

Section: Heat Radiationmentioning

confidence: 99%

Investigation of the heat transfer coefficient for a red clay brick

Tibaut,

Schanz,

Gfrerer

2023

Proc Appl Math and Mech

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There is a need for the development of materials for thermal isolation. Heat energy is used in different ways, for example, for house warming or production of electricity from solar power plants. However, to use the heat energy efficiently isolating materials are needed. There are different materials available to isolate houses and heat storage containers. However, those materials are expensive and some are over engineered. The best available material for thermal isolation would be air that has the thermal coefficient . Thus, materials that trap a large amount of air are good isolators. On the other hand, some isolating materials are harmful for the environment, for example, glass wool, asbestos. An alternative are red clay bricks because red clay is a natural product that is present everywhere on the planet. But the thermal coefficient of red clay bricks is high . To reduce the thermal coefficient cavities can be added in the brick. The cavities trap air and reduce the thermal coefficient of the brick.We simulate the heat transfer through a hollow brick. The holes in the brick are cavities. In order to determine the heat transfer coefficient we solve the heat flux through the hollow brick. For that a model of the brick is formulated as sequence of a solid and a fluid part. In the solid part only heat conduction is present and in the fluid heat transfer is present in form of conduction, convection and radiation. The flow field in the fluid part is modelled with the velocity‐vorticity formulation of the incompressible Navier‐Stokes. It is assumed that the Rayleigh number is below 106, hence, natural convective laminar fluid flow is present in the cavities. The cavities are also heated by heat radiation of the surrounding walls.The numerical realisation is done with the Boundary‐Domain Integral Method (BDIM). To handle suitable geometries the complexity of the BDIM is reduced from quadratic to logarithmic or almost linear by applying the ‐methodology. M is the number of unknown domain nodes. Numerical studies will be presented.

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“…Their paper also discussed the effect of multiple parameters, such as Rayleigh, Grashof, and Prandtl numbers, in order to make the optimal choice of design parameters according to the desired system requirements. Ouakarrouch et al [21] presented a simulation englobing the conduction heat transfer and natural convection as well as radiative heat through two kinds of alveolar walls used in a recent building's construction (3-and 6-hole numbers). Results showed that heat transfer is increased once radiative transfer is considered into calculations.…”

Section: Introductionmentioning

confidence: 99%

3D Modeling of the Thermal Transfer through Precast Buildings Envelopes

2021

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In this paper, a finite-element-based model is being introduced and developed, using the Cast3m (CEA, Paris, France) simulation tool, to evaluate the thermo-mechanical behavior of a small-scale test bed. In fact, many studies on thermal behavior of cavities have been carried out in literature. However, none of them took into account the co-existence of all thermal phenomena (conduction, convection, internal/external radiation). The work presented in this paper presents a thermo-mechanical model, which aims to combine, in a holistic way, these phenomena. An experimental validation of the thermal model has been first carried out using an infrared camera and DS18B20 (Maxim Integrated Products, Dallas, TX, USA) numerical sensors. Results are reported and show the accuracy of the proposed model since both numerical and experimental values of heat transmittance fit together. The main objective is to evaluate heat losses through the walls, by means of heat transmittance calculation, and proposing new functional materials that will help in energy harvesting, as a perspective of this work. As for the mechanical study, it was meant to investigate the distribution of the mechanical stress towards the building envelope submitted to its own weight. Results showed that the stress is uniformly distributed on the lateral walls of the structure as well as on the floor.

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Three-dimensional numerical simulation of conduction, natural convection, and radiation through alveolar building walls

Cited by 10 publications

References 20 publications

Thermal characterization of a new bio-composite building material based on plaster and waste chicken feathers

Thermal characterization of a new bio-composite building material based on plaster and waste chicken feathers

Investigation of the heat transfer coefficient for a red clay brick

3D Modeling of the Thermal Transfer through Precast Buildings Envelopes

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