Steady state theoretical model of fired clay hollow bricks for enhanced external wall thermal insulation

Bouchair, Ammar

doi:10.1016/j.buildenv.2007.10.005

Cited by 95 publications

(32 citation statements)

References 6 publications

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“…On the contrary, the comparison made with a previous analysis [18] carried out on walls with traditional brick indicates a substantial difference. In fact, only four of the eight walls analyzed have a behavior that is comparable with the mean values obtained in the present work (difference < 6%), while for the remaining walls, the values obtained are clearly different.…”

Section: Resultsmentioning

confidence: 50%

“…For the block with polystyrene, the U-value calculated is 0.29-0.69 W/m 2 ·K. The comparison with the two previous evaluations [18,19] offers insight into whether the percentages of improvement found in this paper could be extended to other kinds of brick or block, with different geometric and material properties. Figure 3 shows the values of reduction obtained in this work compared with the values obtained in a previous analysis, using the same methodology, but carried out on a different block, and an analysis carried out on walls made with traditional bricks.…”

Section: Resultsmentioning

confidence: 82%

“…Figure 3. Comparison between the impacts of surface emissivity on the variation in equivalent thermal conductivity of the blocks obtained in the present work (grey lines) and in a previous investigation (red point [18], blue point [19]). …”

Section: Resultsmentioning

confidence: 98%

“…In a numerical analysis on the thermal behavior of fired clay hollow bricks [18], the reduction in the emissivities of cavities was investigated as a solution for improving the thermal resistance of the brick. The analysis was carried out on small and large-sized bricks, for different values of surface emissivity (between 0.3 and 0.7).…”

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of Hollow Clay Brick with Low Emissivity Treatment in Surface Enclosures

Fioretti

Principi

2014

Coatings

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External walls made with hollow clay brick or block are widely used for their thermal, acoustic and structural properties. However, the performance of the bricks frequently does not conform with the minimum legal requirements or the values required for high efficiency buildings, and for this reason, they need to be integrated with layers of thermal insulation. In this paper, the thermal behavior of hollow clay block with low emissivity treatment on the internal cavity surfaces has been investigated. The purpose of this application is to obtain a reduction in the thermal conductivity of the block by lowering the radiative heat exchange in the enclosures. The aims of this paper are to indicate a methodology for evaluating the thermal performance of the brick and to provide information about the benefits that should be obtained. Theoretical evaluations are carried out on several bricks (12 geometries simulated with two different thermal conductivities of the clay), using a finite elements model. The heat exchange procedure is implemented in accordance with the standard, so as to obtain standardized values of the thermal characteristics of the block. Several values of emissivity are hypothesized, related to different kinds of coating. Finally, the values of the thermal transmittance of walls built with the evaluated blocks have been calculated and compared. The results show how coating the internal surface of the cavity provides a reduction in the thermal conductivity of the block, of between 26% and 45%, for a surface emissivity of 0.1. OPEN ACCESSCoatings 2014, 4 716

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Section: Resultsmentioning

confidence: 50%

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of Hollow Clay Brick with Low Emissivity Treatment in Surface Enclosures

Fioretti

Principi

2014

Coatings

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“…The protection against climatic conditions has always been a concern of people all over the world; for example, the high summer temperatures and low winter temperatures cause discomfort [2]. Because of the large number of voids in the lightweight aggregate, the resulting lightweight concrete possesses a higher thermal insulating efficiency than normal concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Engineering and Thermal Properties of Mortar and Plaster Produced With Pumice Aggregate

Eren

Marar

İlter

et al. 2015

Journal of Testing and Evaluation

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Now, it is widely accepted by civil engineers and architects that walls and masonry building units, which are made of pumice, can insulate buildings against both heat and sound, and also reduce the dead load of the building compared to traditional buildings. In this study, pumice was used as a fine aggregate in mortar and plaster instead of traditional crushed limestone sand. This study shows that the properties of pumice mortars indicate lower values compared to limestone mortars for workability durations, time of settings, and fresh and hardened unit weights. Other properties of pumice mortars indicate higher values compared to limestone mortars, such as water absorption, coefficient of capillary water absorption, drying shrinkage, flexural strength, and compressive strength. Also, wall systems made with pumice mortar and plaster show significant benefits in terms of thermal conductivity.

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Interface Engineering Driven Stabilization of Halide Perovskites against Moisture, Heat, and Light for Optoelectronic Applications

Singh

Kajal

Kim

et al. 2020

Advanced Energy Materials

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Moisture, heat, and light instabilities of halide perovskites (HPs) represent a serious Achilles' heel that must be overcome, to enable future advancements in perovskite‐based optoelectronic devices such as solar cells and light‐emitting diodes. The instabilities are attributed to the unavoidable fragile ionic bonding between cationic and anionic parts of HPs during their formation. Surface passivation of HPs by various surface‐passivating materials has proven to be an attractive approach to stabilize perovskites against moisture, heat, and light, keeping intact their structural integrity and ionic bonding. Herein, the experimental and theoretical background for degradation mechanisms of HPs is reviewed along with various surface passivating materials to stabilize HPs. Finally, the existing challenges associated with thin‐film and device fabrication and an outlook for improving the stability of perovskites in optoelectronics are presented

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Steady state theoretical model of fired clay hollow bricks for enhanced external wall thermal insulation

Cited by 95 publications

References 6 publications

Thermal Performance of Hollow Clay Brick with Low Emissivity Treatment in Surface Enclosures

Thermal Performance of Hollow Clay Brick with Low Emissivity Treatment in Surface Enclosures

Experimental Study on Engineering and Thermal Properties of Mortar and Plaster Produced With Pumice Aggregate

Interface Engineering Driven Stabilization of Halide Perovskites against Moisture, Heat, and Light for Optoelectronic Applications

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