Experimental and numerical investigation of a hollow brick filled with perlite insulation

Żukowski, Mirosław; Haese, G.

doi:10.1016/j.enbuild.2010.03.009

Cited by 88 publications

(43 citation statements)

References 15 publications

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“…This has been confirmed in steady state heat transfer by some experimental and numerical studies, such as those of Zukowski and Haese [16], Tang et al [17], Pavlík et al [18], and Bassiouny et al [19].…”

Section: Introductionsupporting

confidence: 55%

Dynamic Thermal Features of Insulated Blocks: Actual Behavior and Myths

2017

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Abstract:The latest updates in the European directive on energy performance of buildings have introduced the fundamental "nearly zero-energy building (NZEB)" concept. Thus, a special focus needs to be addressed to the thermal performance of building envelopes, especially concerning the role played by thermal inertia in the energy requirements for cooling applications. In fact, a high thermal inertia of the outer walls results in a mitigation of the daily heat wave, which reduces the cooling peak load and the related energy demand. The common assumption that high mass means high thermal inertia typically leads to the use of high-mass blocks. Numerical and experimental studies on thermal inertia of hollow envelope components have not confirmed this general assumption, even though no systematic analysis is readily available in the open literature. Yet, the usually employed methods for the calculation of unsteady heat transfer through walls are based on the hypothesis that such walls are composed of homogeneous layers. In this framework, a study of the dynamic thermal performance of insulated blocks is brought forth in the present paper. A finite-volume method is used to solve the two-dimensional equation of conduction heat transfer, using a triangular-pulse temperature excitation to analyze the heat flux response. The effects of both the type of clay and the insulating filler are investigated and discussed at length. The results obtained show that the wall front mass is not the basic independent variable, since clay and insulating filler thermal diffusivities are more important controlling parameters.

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Section: Introductionsupporting

confidence: 55%

Dynamic Thermal Features of Insulated Blocks: Actual Behavior and Myths

2017

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“…Expanded perlite has various physical properties with commercial applications including high porosity, low thermal conductivity, low bulk density, high sound absorption, high heat resistance, high surface area, and chemical inertness or stability. These properties make expanded perlite adaptable to applications in several industries including construction Işikdağ, 2007, 2008;Zukowski and Haese, 2010;Sengul et al, 2011;Celik et al, 2014), chemical (Vaou and Panias, 2010), air (Gutarowska et al, 2014) and liquid filtration (Chakir et al, 2002;Torab-Mostaedi et al, 2011;Akkaya, 2012), horticultural (Daza et al, 2000;Acuña et al, 2013;Asaduzzaman et al, 2013), and petrochemical (Perlite Institute). The specific uses of expanded perlite in several industries are shown in Figure S1 in the Supplementary Figures section.…”

Section: Introductionmentioning

confidence: 99%

Geology of the Selene perlite deposit in the northern Sierra Madre Occidental, northeastern Sonora, Mexico

Hinojosa-Prieto¹,

Vidal-Solano²,

Kibler³

et al. 2016

BSGM

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The Selene perlite ore deposit of northeastern Sonora, Mexico, lies at the southern edge of an extensive (85 × 35 km) assemblage of Early Oligocene-Miocene volcanic rocks. This fault-bounded and east-tilted volcanic assemblage is of variable composition and was erupted onto Cretaceous non-volcanic rocks. The volcanic ridge is located within the tectonically extended region of the northern Sierra Madre Occidental (SMO) silicic large igneous province. Geologic mapping reveals a faulted and uplifted bimodal volcanic sequence, dated as Late Oligocene, that contains more perlite outcrops than previously recognized and two new coplanar normal faults of Early Miocene age or younger that promoted the development of an adjacent, small half-graben filled by a volcaniclastic unit. The bimodal volcanic sequence comprises a basal Early Eocene rhyolitic lava and rhyolitic tuff overlain by a rhyolitic ignimbrite sheet, a middle flow-banded rhyolitic lava dome that hosts the Selene perlite flow, and the upper basalt on an erosional unconformity. The volcaniclastic unit rests in angular unconformity with the bimodal volcanic sequence, and was likely deposited in the Early Miocene. It comprises a lower fault breccia containing clasts of local eruptive products, a previously unidentified thin quartz arenite bed, and an upper, thick polymictic conglomerate containing clasts of perlite, rhyolite, andesite, and basalt. Potential sources for the bimodal (silicic and mafic) volcanic facies are distal and proximal-distal volcanic fissure vents, the locations of which were controlled by preexisting NW-SE and N-S normal faults and related fractures linked to the Mexican Basin and Range Extensional Province. This implies the bimodal volcanism to be synchronous with crustal extension, as recently shown for other areas of the SMO silicic large igneous province. Normal faulting in the area also influenced the formation, preservation, and exposure (uplift) of the Selene perlite flow. The structural discontinuities created a permeable uppermost crust that channeled meteoric water into the subsurface and promoted both the percolation and underground circulation of meteoric water and gases rising into the subsurface. The water-lava interactions led to the hydration of the flow-banded rhyolitic lava flow and the formation of huge amounts of perlite. The Selene perlite was partly preserved by the overlying basalt, but continued local normal faulting and subsequent erosion exposed the perlite ore at its current location.

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“…Heat insulation performance of bricks can be enhanced by eliminating or reducing each of these heat transfer modes separately or simultaneously if possible. For instance, cavities of bricks can be configured in such a way to suppress convection [3][4][5], covering the internal surface of the enclosures with low emissivity coating to reduce radiation [6,7] or filling the cavities with insulation or low conductive materials to eliminate both convection and radiation simultaneously [8][9][10]. * corresponding author; e-mail: muslumarici@gmail.com…”

Section: Introductionmentioning

confidence: 99%

Investigation of Heat Insulation Performance of Hollow Clay Bricks Filled with Perlite

2016

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In this study, the possibility of enhancing heat insulation performance of hollow bricks by filling the cavities with perlite is investigated. A conjugate heat transfer by conduction, convection and radiation in different hollow bricks are analyzed numerically to assess their thermal performance. Calculations are performed for three scenarios for each type of hollow brick: (i) cavities are filled with air, (ii) half of the cavities are filled with perlite while the other half is filled with air, (iii) all cavities are filled with perlite. The benefit of filling cavities with perlite is justified quantitatively for each investigated hollow brick type. It is concluded that the enhancement in insulation performance can be up to 15.6% and 27.5% for half-perlite and full-perlite cases, respectively, depending on the brick type.

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Experimental and numerical investigation of a hollow brick filled with perlite insulation

Cited by 88 publications

References 15 publications

Dynamic Thermal Features of Insulated Blocks: Actual Behavior and Myths

Dynamic Thermal Features of Insulated Blocks: Actual Behavior and Myths

Geology of the Selene perlite deposit in the northern Sierra Madre Occidental, northeastern Sonora, Mexico

Investigation of Heat Insulation Performance of Hollow Clay Bricks Filled with Perlite

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