Thermal inertia of newspaper sandwiched aerated lightweight concrete wall panels: Experimental study

Ng, Soon-Ching; Low, Kaw-Sai; Tioh, N. H.

doi:10.1016/j.enbuild.2011.06.022

Cited by 18 publications

(6 citation statements)

References 9 publications

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“…The decrement factor, which is expressed by Equation ( 9), is defined as the decrease in the amplitude of the temperature in the passage from the outside environment to the inside. The time lag, which is expressed by Equation (10), is the propagation time (in h) of the thermal flux from the outside to the inside of the wall [31,32].…”

Section: Resultsmentioning

confidence: 99%

“…Simultaneous monitoring was carried out on rooms with high internal heat loads (school classrooms), and the internal inertia of the envelope was varied using an insulating panel on the interior side. Ng et al [10] studied the most influential parameters in thermal inertia on lightweight concrete wall panels, and found that thermal diffusivity had a positive relationship with the thermal inertia of wall panels. Based on a 1D numerical model, Jin et al [11] studied the influence of heat flux on time lag and the decrement factor on the thermal properties and thickness of walls.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Inertia Characterization of Multilayer Lightweight Walls: Numerical Analysis and Experimental Validation

et al. 2021

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The thermal inertia properties of construction elements have gained a great deal of importance in building design over the last few years. Many investigations have shown that this is the key factor to improve energy efficiency and obtain optimal comfort conditions in buildings. However, experimental tests are expensive and time consuming and the development of new products requires shorter analysis times. In this sense, the goal of this research is to analyze the thermal behavior of a wall made up of lightweight concrete blocks covered with layers of insulating materials in steady- and transient-state conditions. For this, numerical and experimental studies were done, taking outdoor temperature and relative humidity as a function of time into account. Furthermore, multi-criteria optimization based on the design of the experimental methodology is used to minimize errors in thermal material properties and to understand the main parameters that influence the numerical simulation of thermal inertia. Numerical Finite Element Models (FEM) will take conduction, convection and radiation phenomena in the recesses of lightweight concrete blocks into account, as well as the film conditions established in the UNE-EN ISO 6946 standard. Finally, the numerical ISO-13786 standard and the experimental results are compared in terms of wall thermal transmittance, thermal flux, and temperature evolution, as well as the dynamic thermal inertia parameters, showing a good agreement in some cases, allowing builders, architects, and engineers to develop new construction elements in a short time with the new proposed methodology.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Inertia Characterization of Multilayer Lightweight Walls: Numerical Analysis and Experimental Validation

et al. 2021

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“…Also, it depends on two factors namely time lag and decrement factor, they are influenced by thermo-physical properties of the material, thickness and wall position's. In the heat storage capacities the essential characteristics are time lag and decrement factor [10]. Numerous works have been performed in this field.…”

Section: Introductionmentioning

confidence: 99%

The effect of the thermal inertia on the thermal transfer in building wall

et al. 2017

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In a hot and dry climate, the design and construction of buildings involve the adoption of combination between shape of building envelope and construction materials. The objective of this work is to study the thermal behavior of a multilayer wall submitted to varying climatic conditions. We have proposed four configurations of an element of an outer wall. A numerical simulation was used to understand the phenomenon of thermal inertia, especially its influence on the resulting temperatures. The study is based on the modeling of heat transfer in a 2D unsteady-state using a computational fluid dynamics (CFD) code. The comparison of numerical results was affected with an available experimental data and shows a satisfactory agreement. In addition, this work highlights the importance of the study of the thermal inertia of the wall in order to ensure a comfortable indoor climate of building located in hot and dry climate.

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“…La conductividad térmica está relacionada con la capacidad del concreto para conducir calor (Schackow et al, 2016), es decir que se puede medir como la velocidad a la que pasa el calor a través del material, esto se relaciona con la inercia térmica y la capacidad calorífica del concreto, pues el grado de lentitud con el que un cuerpo se aproxima a su entorno o al ambiente (Ng, Low, & Tioh, 2011) depende de la difusividad térmica, que es la propiedad que describe la rapidez con la que el concreto reacciona con el cambio de temperatura y la capacidad para difundir el calor en todas direcciones (Schackow et al, 2016).…”

Section: Propiedades Térmicas Del Concretounclassified

“…Los 9 perfiles de temperatura obtenidos se analizaron a fin de que el historial escogido simulara las condiciones de cada placa, autores como (Mak & Torii, 1995;Sofi et al, 2012) simularon las condiciones en ambientes con agua a temperatura controlada sin tener en cuenta la humedad relativa del ambiente, o utilizando una humedad relativa controlada con un valor fijo (Jiang, Jiang, Zha, & Song, 2017), dejando de lado la importancia de la cantidad de vapor de agua en el ambiente y su relación con la ganancia de resistencia como lo resaltan (Rómel Solís Carcaño & Eric I. Moreno, 2005), así como el comportamiento por la inercia térmica del material y el desprendimiento de calor (Ng et al, 2011).…”

Section: Ajuste De Resistencia De Núcleosunclassified

Metodología para determinar la resistencia a edades tempranas del concreto en placas macizas usando el acondicionamiento de temperatura

Mateus¹

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En el presente trabajo se determinó el nivel de exactitud de la metodología de acondicionamiento de temperatura con relación a la evolución de resistencias del concreto a edades tempranas en placas macizas. Para esto se verificó el comportamiento y desarrollo de las temperaturas del concreto y se determinó la evolución de la resistencia a 1, 2, 3 y 7 días en especímenes de concreto curados con el acondicionamiento de temperatura, finalmente se compararon los resultados de resistencia de estos, con el ensayo de núcleos extraídos en las placas de espesores de 0.10, 0.12 y 0.15 metros. El nivel de exactitud de la metodología arrojó que la estimación de la resistencia está por encima del 90%, habiendo realizado la comparación entre núcleos extraídos y los cilindros curados con acondicionamiento. A partir de esta metodología se pudo establecer una alternativa para determinar la resistencia del concreto en placas macizas in situ para sistemas de construcción industrializada.

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Thermal inertia of newspaper sandwiched aerated lightweight concrete wall panels: Experimental study

Cited by 18 publications

References 9 publications

Thermal Inertia Characterization of Multilayer Lightweight Walls: Numerical Analysis and Experimental Validation

Thermal Inertia Characterization of Multilayer Lightweight Walls: Numerical Analysis and Experimental Validation

The effect of the thermal inertia on the thermal transfer in building wall

Metodología para determinar la resistencia a edades tempranas del concreto en placas macizas usando el acondicionamiento de temperatura

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