Thermal Performance of Concrete Masonry Unit Wall Systems PDF Download

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: T. Z. Harmathy
Publisher: National Research Council of Canada, Division of Building Research
ISBN:
Category : Concrete
Languages : en
Pages : 35

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Book Description

Author: A. E. Fiorato
Publisher:
ISBN:
Category : Exterior walls
Languages : en
Pages : 26

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Author: T. Z. Harmathy
Publisher:
ISBN:
Category :
Languages : en
Pages : 4

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Author: United States. Department of Housing and Urban Development. Office of Policy Development and Research
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 46

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Book Description

Author: Jan Kośny
Publisher: Springer Nature
ISBN: 3030986934
Category : Architecture
Languages : en
Pages : 487

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Book Description
This book offers a unique treatment of building insulating products and the integration of these products with building components. This book was written for all those involved in building design, specification, construction, and commissioning, providing them with an understanding of and appreciation for the wide variety of thermal insulation products and technologies available for use in all types of buildings. The book proceeds from basic definitions and discussion of heat-transfer topics and thermal insulation concepts, to the design and use of these products. The impact of thermal insulation on dynamic building performance, including factors other than heating and cooling, is also discussed. The book does not require an advanced mathematical background. The authors provide sufficient information to provide a qualitative understanding, with more mathematical sections included for those interested in modeling and analysis. The basic physics associated with heat transfer in buildings are presented, along with the steady-state and transient analysis techniques needed for the effective implementation of thermal insulation and assemblies. Modern building design involves the integration of comfort, safety, economics, durability and cost considerations, all of which impact the selection and use of thermal insulation materials in buildings. In addition to theoretical explanations of the underlying science, the book details the properties and application of new thermal insulation materials, including vacuum panels, gas-filled panels, aerogels, phase-change materials, and radiation control technologies. Given its scope, the book will be of interest to researchers and building engineers wishing to understand the latest technologies and materials available, so as to achieve reduced energy consumption in commercial and residential buildings.

Author: JS. Crandall
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 8

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This paper presents details, experimental data, and evaluation of the performance of single-wythe concrete block wall construction incorporating nearly continuous insulation and thermal breaks between the faceshells and webs of two-core lightweight concrete masonry units. The results of lateral-load tests as well as dynamic heat exchange studies are discussed. Analysis of behavior under load indicates no difference in capacity or failure mode for the insulated block units when compared with conventional concrete masonry construction of comparable weight, thickness, and material properties. Overall conductance of insulated units is reduced 10 to 86%, depending on the dynamics of the heat exchange cycle, when compared to conventional units. Proposed refinements in the design of insulated units may achieve thermal performance comparable to "super insulated" construction in other materials.

Author: Bradley A. Peavy
Publisher:
ISBN:
Category : Concrete houses
Languages : en
Pages : 108

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Author: ACI Committee 122
Publisher:
ISBN: 9780870310850
Category : Concrete
Languages : en
Pages : 21

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Author: Maysoun Ismaiel
Publisher:
ISBN:
Category : Building materials
Languages : en
Pages : 0

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Book Description
Evaluation of the thermal resistance of building envelope elements is essential for a reliable assessment of the thermal behaviour and energy efficiency of buildings. Energy codes continue to drive the building construction industry toward more stringent thermal performance standards. To reduce energy consumption in buildings and comply with newer, more stringent energy code requirements, evaluation of the thermal resistance of above-grade wall assemblies is becoming essential. Masonry veneer cladding is typically supported by the building structure using intermittent anchors and shelf angle bearing supports. However, elements with high thermal conductivity, such as floor intersections and cladding attachment systems, often penetrate the insulation and cause thermal bridging. Thermal bridges have a significant reduction effect on the elements' thermal resistance. Moreover, condensation on thermal bridging elements is expected. As a result, damage to building elements occurs. In terms of calculating the effective thermal resistance (R-value), the lateral heat flows caused by these highly conductive elements allow heat to be transferred in multiple directions, which is considered a challenge in the R-value estimations and causes the inability of a quick estimate of the effective thermal resistance of masonry components with sufficient precision due to the complexity of masonry construction. Currently, an accurate estimation of the R-value of masonry walls is a time-consuming task, which lengthens the design process, especially in the early design stage. Therefore, this study aims to provide efficient approaches for estimating the R-values of common concrete masonry cavity walls. Two estimation approaches are presented. First, the estimation of the R-value of common concrete masonry veneer wall configurations is presented in the form of simple design charts and R-value multipliers. Parameters such as the concrete block density, thermal insulation value, as well as the types of ties and shelf angles are addressed. The approach provides simultaneously the mechanical (the masonry compressive strength, fm') and thermal (R-value) properties of different veneer wall configurations, allowing designers to obtain appropriate structural and thermal properties during the preliminary design phase. In addition, the design charts and R-value multipliers help designers evaluate and compare the impacts of changes in different parameters on R-values, thereby facilitating their design development. A comparison of the impacts of different parameters on the thermal resistance of masonry walls was presented. The results showed that the thermal resistance of masonry cavity walls was improved by using different tie types and materials. In the case of using galvanized, stainless-steel and Glass Fiber Reinforced Polymers (GFRP) perforated fastened on block's surface ties, the thermal resistance improved by 25%, 43% and 60%, respectively, compared to the traditional galvanized solid block ties. Using knife plate galvanized and stainless-steel shelf angles in the intermediate floor intersection assemblies improved the overall average R-values by 30% and 63%, respectively, compared to the traditional galvanized steel directly attached shelf angle. Moreover, the results showed that the shape and material of the ties and shelf angles are more effective in the masonry wall assemblies with higher insulation R-values. Also, the effect of the concrete block density was addressed, and the results showed that, on average, the reduction of the concrete block density by 10% showed an improvement in the effective R-value of 3.5%. In addition, configurations with an expected lower effective thermal resistance are more sensitive to the concrete block density. Also, cases using solid ties are more sensitive to block density reduction than cases using perforated ties. The second approach provides adjustments to current analytical methods of thermal resistance estimation (i.e., isothermal plane and parallel path methods) to include the effect of the thermal bridge resulting from veneer ties and slab intersections. The R-values obtained from the suggested adjustments were compared with numerical simulations using a 3D steady-state finite element method (FEM) in addition to experimental validation obtained from the literature. The clear wall adjustment factors result showed an average accuracy of 2% in the case of using the suggested adjustments, compared to 19% and 25% for isothermal plane and parallel path methods, respectively. With the presented approaches, designers can choose the optimum wall components' material properties in the early design phase to meet structural and thermal requirements without using computer simulations or experimental investigations.