Numerical Thermal Analysis of Applying Insulation Material to Holes in Hollow Brick Walls by the Finite-Volume Method

Tang, Dawei; Li, L. P.; Song, Chongfang; Tao, Wen‐Quan; He, Ya‐Ling

doi:10.1080/10407782.2014.986396

Cited by 20 publications

(13 citation statements)

References 24 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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“…Diaz et al investigated thermal properties of light concrete hollow brick with finite-element method and the results showed that engineers could find optimal wall configuration and choose suitable building materials with the help of their comprehensive analyses [13]. Tang et al studied the effect on thermal performance of pasting 10 mm insulation around holes in external walls with the finite-volume method and the results showed that it could reduce equivalent thermal conductivity with the method that authors put forward [14]. Wu et al studied the mechanical and thermal properties of the wall made by rectangular fire hollow blocks and the blocks were made by building waste and industrial waste, the results showed that the blocks satisfied the relevant Chinese standard and it had a high compressive strength and reliable insulation performance comparing with fired common brick or other hollow blocks [15].…”

Section: Figure 1 Structural Self-insulation Systemmentioning

confidence: 99%

A New Energy-Efficient Building System Based on Insulated Concrete Perforated Brick with a Sandwich

Xing

Zhang

et al. 2018

CivileJournal

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The purpose of this research is to put forward a new energy-efficient building system that can meet the energy saving requirement of 65% for public buildings in cold areas based on modified insulated concrete perforated brick with a sandwich. Modified brick was composed of three parts and three parts can be made a whole in brick manufacturing and it was called self-thermal insulation concrete perforated brick and could avoid appearance of cracks. The tesst was done to obtain thickness of EPS for modified insulated concrete perforated brick with a sandwich in order to meet the requirement of insulation. Thickness of EPS was set to to 45, 50, 55, 60, 65 and 75 mm respectively and comparative experiments were also carried out to verify the effect of insulation for modified bricks and unmodified bricks. Field tests were carried out to obtain appropriate masonry methods for modified bricks. Based on the results of analysis and discussion, then obtained: (1) Heat transfer coefficient of wall made by modified bricks was less than heat transfer coefficient of wall made by unmodified bricks when the same for thickness of EPS, it could be reduce by up to 45%; (2) When thickness of insulating layer was 65 mm, heat transfer coefficient of wall made by modified bricks could reached minimum limit 0.45 and it could meet energy saving requirement of 65% for buildings in cold area. (3) Insulating layer, located inside of the wall, could avoid appearance of cracks on surface of wall for modified bricks.

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“…The findings in the African continent including in Nigeria [11] [14], Jakarta, Manila and Bangkok [30], and Saudi Arabia [28] suggest that the rapid growth of cities is a major challenge for urban areas and the integration of rural areas around cities has led to consequences which have not been positive for rural areas around cities. Therefore, the rapid growth of urbanization on the one hand, and the lack of proper policies and unsuitable urban design on the other hand, with other cultural, social and political factors, have caused deformation and irregular development of the metropolitan areas.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Physical factors: transportation network and access system, city division and performance system, urban services and distribution of facilities, their spatial distribution, housing system and city form, land talent and land use system. Laws, regulations, plans and designs of agencies and organizations [14].…”

Section: Urban Boundary and The Requirements Of The Villagesmentioning

confidence: 99%

“…Nevertheless, 90 respondents knew 704 people who did not go to school for this, which means that on average, everyone knew 7.8 people who did not go to school because of distance. Of these, 545 were girls, since families more often allow their sons to walk on a long path or use unknown vehicles for going round, but do not give such permission to their daughters [14].…”

Section: Demographic and Social Problemsmentioning

confidence: 99%

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Requirements and Policies for Managing Villages in Tehran Metropolitan Area

Khorasani¹

2018

CivileJournal

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Due to the spatial proximity to and spatial-physical dependence on cities, the villages of the cities have many facilities, constraints, opportunities and challenges that are not so extreme in other villages. The main objective of this research is to identify the features of villages located in the metropolitan areas of Iran and provide strategies for managing the problems and challenges of these villages, with emphasis on the villages of Tehran Metropolitan Area. The most important policy recommendations presented in this study are: considering an efficient public transportation system for servicing these villages; a strategic look of the municipality's collection on the issue of employment of people in the city villages which are increasingly migrating into Tehran to provide their livelihoods; the issue of green space in the metropolitan villages and their perspective, which is directly available to the villagers, but the municipality of Tehran can take steps in order to improve the indices related to green space and rural landscape in city areas by adopting due measures; Development of an intermediate facility in Tehran with the aim of preventing the city from spreading to the surrounding area and the villages therein; and finally, regionalism's strategy as the most reasonable, operational and efficient management strategy for investigating and managing the challenges of Tehran metropolitan area villages.

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Numerical Thermal Analysis of Applying Insulation Material to Holes in Hollow Brick Walls by the Finite-Volume Method

Cited by 20 publications

References 24 publications

Dynamic Thermal Features of Insulated Blocks: Actual Behavior and Myths

Dynamic Thermal Features of Insulated Blocks: Actual Behavior and Myths

A New Energy-Efficient Building System Based on Insulated Concrete Perforated Brick with a Sandwich

Requirements and Policies for Managing Villages in Tehran Metropolitan Area

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