Numerical analysis of thermal transmittance of hollow concrete blocks

2017 ◽  
Vol 41 (1) ◽  
pp. 7-24 ◽  
Author(s):  
Gerson Henrique dos Santos ◽  
Marcelo Adriano Fogiatto ◽  
Nathan Mendes
Keyword(s):  
Numerical Analysis ◽  
Thermal Transmittance ◽  
Concrete Blocks

Numerical Analysis of Window Structure Seating Depth Effects on Surface Temperature and Linear Thermal Transmittance

2014 ◽  
Vol 1057 ◽  
pp. 53-60 ◽  
Author(s):  
Marek Zozulák ◽  
Marián Vertaľ ◽  
Dušan Katunský
Keyword(s):  
Computer Simulation ◽  
Numerical Analysis ◽  
Numerical Experiment ◽  
Coupling Coefficient ◽  
Thermal Field ◽  
Thermal Coupling ◽  
Thermal Transmittance ◽  
Surface Temperatures ◽  
Deformation Amount ◽  
Depth Effects

The paper deals with effect of window structure seating depth in window lining on the deformation of thermal field represented by the change in surface temperatures and thermal coupling coefficient. Alternative depths of window structure seating are analysed by the numerical experiment using the computer simulation of thermal field. The objective of analysis is to optimize the window structure seating depth in the existing experimental wall. The effect of deformation amount of thermal field of analyzed contact on the course of surface temperatures and thermal coupling coefficient of the binding has also been analysed.

scholarly journals Numerical Analysis of Dynamic Force Acting Perpendicularly on a Wall Made of Concrete Blocks with Rubber Inserts

2016 ◽  
Vol 16 (2) ◽  
pp. 109-116 ◽  
Author(s):  
Maciej Major ◽  
Izabela Major
Keyword(s):  
Numerical Analysis ◽  
Back Surface ◽  
Wall Structure ◽  
Dynamic Force ◽  
Structure Model ◽  
Concrete Blocks

Abstract In this paper numerical analysis considering the influence of dynamical force acting on wall made of concrete blocks with rubber inserts is presented. By examining the stress values on front and back surface of the analysed wall structure model, the effectiveness of proposed solution can be measured comparing to the wall made of concrete blocks without rubber inserts. Complete numerical analysis was performed in ADINA program.

scholarly journals ON THE HEAT TRANSFER AND LINEAR THERMAL TRANSMITTANCE ACROSS WINDOW FRAMES AND BUILDING WALLS BY MEANS OF NUMERICAL ANALYSIS

2009 ◽  
Vol 15 (31) ◽  
pp. 789-792
Author(s):  
Chiaki MIYAZAWA ◽  
Hiroshi AKASAKA ◽  
Kiyoshi ITAMI ◽  
Tatsuichiro TASHIRO
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Thermal Transmittance ◽  
Building Walls ◽  
Window Frames

scholarly journals Thermal Performance Assessment of Walls Made of Three Types of Sustainable Concrete Blocks by Means of FEM and Validated through an Extensive Measurement Campaign

2021 ◽  
Vol 13 (1) ◽  
pp. 386
Author(s):  
Jesús M. Blanco ◽  
Yokasta García Frómeta ◽  
Maggi Madrid ◽  
Jesús Cuadrado
Keyword(s):  
Thermal Behavior ◽  
Energy Savings ◽  
Sustainable Construction ◽  
The Finite Element Method ◽  
Thermal Transmittance ◽  
Concrete Blocks ◽  
Lime Sludge ◽  
The Right ◽  
Additional Reduction ◽  
By Products

The thermal behavior of three different walls, made with and without by-products, is assessed by means of the Finite Element Method, aiming to evaluate its performance in terms of the sustainable construction of the blocks. Results were compared to those obtained from an experimental campaign, aiming at validation of the model. The by-products used for the blocks were “lime sludge” and “sawdust”, whose performance was compared against the traditional blocks made of concrete as a reference, aiming to demonstrate its sustainability, showing decreases of the thermal transmittance up to 10.5%. Additionally, following the same methodology, the thermal behavior of these above-mentioned blocks but now with added internal insulation made of “recycled cellulose” was assessed, showing higher decreases up to 25.5%, increasing sustainability by addressing an additional reduction in waste, so the right combination of using by-products and the insulating filler in their cavities has been revealed as a promising way of optimizing the walls, offering a relevant improvement in energy savings. Finally, when comparing the U-values of the blocks made of concrete without insulation versus those made of by-products, with insulation, improvements up to 33.3% were reached. The adaptation of the procedure through a moisture correction factor was also incorporated.

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

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 449 ◽  
Author(s):  
Marcelo Fogiatto ◽  
Gerson Santos ◽  
João Catelan
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
The United States ◽  
Building Envelope ◽  
Department Of Energy ◽  
Total Consumption ◽  
Thermal Transmittance ◽  
State Evaluation ◽  
The Us ◽  
Concrete Blocks

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.

scholarly journals Thermal Performance Assessment of a Wall Made of Lightweight Concrete Blocks with Recycled Brick and Ground Polystyrene

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 584
Author(s):  
Hrvoje Krstić ◽  
Ivana Miličević ◽  
Damir Markulak ◽  
Mihaela Domazetović
Keyword(s):  
Heat Flow ◽  
Thermal Performance ◽  
Lightweight Concrete ◽  
Thermal Transmittance ◽  
Building Technology ◽  
Concrete Masonry ◽  
Concrete Blocks ◽  
U Value ◽  
Building Walls

Hollow concrete masonry blocks made of low strength self-compacting concrete with recycled crushed brick and ground polystyrene as an aggregate (RBC-EP blocks), and their expected structural role as masonry infill in steel frames, has been confirmed in previous research studies, thus the extensive investigation of thermal properties is presented in this paper to fully approve their potential application in practice. The Heat Flow and Temperature Based Method was used to conduct in-situ measurements of the wall thermal transmittance (U-value). The experimental U-values of the wall without insulation varied from 1.363 to 1.782 W/m2·K, and the theoretical value was calculated to be 2.01 W/m2·K. Thermal conductivity of the material used for making RBC-EP blocks was measured in a laboratory by using a heat flow meter instrument. To better understand the thermal performance characteristics of a wall constructed from RBC-EP blocks, a comparison with standard materials currently used and found on the market was performed. Walls constructed from RBC-EP blocks show an improvement of building technology and environmentally based enhancement of concrete blocks, since they use recycled materials. They can replace standard lightweight concrete blocks due to their desired mechanical properties, as well as the better thermal performance properties compared to commonly used materials for building walls.

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