3D numerical thermal optimization of the roofs constructed with cast-in-situ hollow concrete floor system by finite volume method

Shi, Gang; Li, L.P.; Song, Chongfang; Cheng, Shaozhen; Tao, Wen‐Quan; He, Yingli

doi:10.1016/j.enbuild.2016.09.018

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…Rubberized concrete which can reduce the dead-load of roofs is also important [8]. Hollow concrete roofs can reduce thermal conductivity by 13.65-40.42% [9]. In addition, adding reflective coating and insulation layers to these slabs can reduce their thermal conductivity significantly [10], these two methods are discussed in more details in Sections 3.2 and 3.3.…”

Section: Concrete Roofsmentioning

confidence: 99%

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

Abuseif

Gou

2018

Energies

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The roofs of buildings play an essential role in energy efficiency because a significant amount of solar radiation is absorbed by roofs in hot weather and a significant amount of heat is lost through roofs in cold weather. This paper is a systematic literature review about roofing methods for flat roofs. Ten roofing methods are reviewed in this paper. They are concrete roof, cool roof, insulated roof, roof garden, photovoltaic panels’ roof, biosolar roof, double-skin roof, roof ponds, skylight roof, and wind catcher. The review covers each roof’s main features, heat flux reductions, payback periods, and the appropriate climate for its implementation. Furthermore, the basic principles for selecting appropriate roofing methods are discussed and future studies for integrating these roofing methods are suggested. Some of these methods can eliminate the need of installing HVAC (Heating Ventilation and Air-conditioning) systems and others can achieve a high percentage of heat reduction if they are the right choice and they are implemented in the right circumstances. An incorrect selection could result in mild to severe energy penalties. The review contributes to the increasing knowledge about sustainable roofing and helps designers to increase building energy efficiency by selecting the appropriate roofing method.

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Section: Concrete Roofsmentioning

confidence: 99%

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

Abuseif

Gou

2018

Energies

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“…They found that thermal resistance is very influenced by thermal conductivity and emissivity. Shi et al 32 examined the combined heat transfer in hollow roofs. The equivalent thermal conductivity can be efficiently reduced from 13.65% to 40.42% by installing walls vertically to the heat flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of conjugate heat transfer through concrete hollow bricks

et al. 2023

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The purpose of this study is to determine the thermal conductance of concrete hollow bricks, which is necessary for the evaluation of the energy efficiency of a building. The three varieties of hollow concrete bricks that are often used to build walls in Morocco are the subject of this study. A computational model created using the finite volume method is used to evaluate the conjugate heat transfer through concrete hollow bricks. According to the results, the use of hollow brick type Ah3 reduces the heat flux by approximately 86% compared with type Ah1. It is undeniable that hollow bricks type Ah3 with a thermal conductivity of 1 W/m K can improve the thermal characteristics of building walls.

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“…The findings reveal that the thermal resistance is strongly influenced by the conductivity and emissivity. Shi et al (2016) analyzed combined heat transfer in hollow blocks. They found that the equivalent conductivity of hollow blocks can be effectively reduced from 13.65% to 40.42% by installing partitions vertical to the heat flux.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of combined heat transfers through concrete hollow bricks in a hot climate of Morocco

Jamal

Moutaouakil

Boukendil

et al. 2023

Journal of Building Physics

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The aim of this study is to determine the thermal conductance of concrete hollow bricks, which is crucial for assessing the energy efficiency of buildings. The study focuses on three types of concrete hollow bricks that are frequently used to build walls in Morocco. The three modes of heat transfer by convection, conduction and radiation are taken into account. The thermal behavior of the three types was simulated using a computational model created with the finite volume method. The effect of internal surfaces emissivity and solid wall thermal conductivity on overall heat transfer is investigated using practical values of the thermal excitations. Simulation results of the three types were compared and showed that the concrete hollow brick of Type (C) is the best performing configuration. Indeed, it reduces the thermal conductance ( U-value) by 40% compared to hollow brick of Type (B), which will contribute to improve the thermal resistance of the building walls.

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3D numerical thermal optimization of the roofs constructed with cast-in-situ hollow concrete floor system by finite volume method

Cited by 10 publications

References 21 publications

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness

Numerical modeling of conjugate heat transfer through concrete hollow bricks

Numerical analysis of combined heat transfers through concrete hollow bricks in a hot climate of Morocco

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