Thermal performance of a hollow block with/without insulating and reflective materials for roofing in Mexico

Xamán, J.; Cisneros-Carreño, J.; Hernández-Pérez, I.; Hernández-López, I.; Aguilar-Castro, K.M.; Macías-Melo, E.V.

doi:10.1016/j.applthermaleng.2017.04.163

Cited by 24 publications

(12 citation statements)

References 40 publications

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“…Totally, 6 room heaters are associated in series to control power system which is utilized as a heat source to heat one face of the selected specimen. Thermocouples were connected by sticky tape onto the zone on which the heat was connected [27][28][29][30][31][32]. Experimental setup had all out nine thermocouples and three advanced multimeter for presentation.…”

Section: Experimental Programmentioning

confidence: 99%

Withdrawn

2019

IJEAT

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Construction of housing with levels of popularity on energy saving is the most significant tasks. Lessening the thermal raise during the rooftop and divider boards is the most ideal advance to manage declining energy usage and to giving thermal help to the customers of private or business structures. Thermal insulation of buildings assumes a vital function in upgrading the comfort level of tenants by lessening the temperature of the building. In this investigation, we focused to reduce the thermal qualities in building by protecting polystyrene material in roof ceilings and wall panels. Here, we investigate the temperature among two climatic conditions i.e. summer and winter. The temperature is noted for 3 hours with 10 minutes interval for totally 40 specimens. Different types of specimens are used i.e. Reinforced Cement concrete (RCC) and Fiber Reinforced Concrete (FRC) specimens based on treated and untreated with insulating materials. The experimental results are validated by using training based Optimal Neural Network (ONN); here the ONN structure is trained with the help of Levenberg- Marquardt (LM) algorithm. The optimization predicted temperature for each specimen with Minimum Error Rate (MSE) compared to existing approaches.

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Section: Experimental Programmentioning

confidence: 99%

Withdrawn

2019

IJEAT

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“…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. Some researchers have introduced the use of phase change material (PCM) which can absorb heating by a melting process before reaching internal spaces, thus reducing heat up to 40% [11].…”

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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“…It was observed that increasing the block thickness with an increase in hole spacing was more effective than increasing the hole rate. Xamán et al [12] also performed a numerical study on hollow blocks with and without insulating and reflective materials for roofing. The results showed that a change in the configuration of insulating could improve the thermal insulation by 46.3%.…”

Section: Introductionmentioning

confidence: 99%

Numerical Two-Dimensional Steady-State Evaluation of the Thermal Transmittance Reduction in Hollow Blocks

2019

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After the first concerns about global energy consumption around the 70 s, some standards were established with the aim of improving the energy efficiency in buildings. In this context, according to the US Department of Energy, heating, ventilation, and air conditioning (HVAC) systems comprise about 50% of the building energy consumption and 20% of total consumption in the United States. Energy consumption of this kind of equipment depends on several factors, one of the most important factors being the heat transfer through the building envelope. In the walls, hollow concrete blocks have become common in recent years due to advantages such as their strength, their space for pipes and wiring, and fast construction, among others. In order to reduce the thermal load, several forms of insulation were tested on these constructive elements. Thus, effects of the low emissivity, insulating material, radiant shields, and baffles on the inner cavities of the blocks are presented in this paper. Effects of temperature differences between the exterior surfaces on the thermal transmittance and on the combined average heat transfer coefficient inside the cavities are also shown.

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Thermal performance of a hollow block with/without insulating and reflective materials for roofing in Mexico

Cited by 24 publications

References 40 publications

Withdrawn

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

Numerical Two-Dimensional Steady-State Evaluation of the Thermal Transmittance Reduction in Hollow Blocks

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