Mechanical characterization and thermal conductivity measurements using of a new 'small hot-box' apparatus: innovative insulating reinforced coatings analysis

Buratti, Cinzia; Belloni, Elisa; Lunghi, Leandro; Borri, Antonio; Castori, Giulio; Corradi, Marco

doi:10.1016/j.jobe.2016.05.005

Cited by 20 publications

(10 citation statements)

References 18 publications

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“…Therefore, the literature review shows that the calibrated hot box is the most used [3,4,6,13,17,19,20,[23][24][25][26]28,30,32,33,36,37] followed by the guarded hot box [5,7,14,15,18,21,22,29,31,34,35] and the simple hot box [16,27,38]. The measuring systems always employ analog probes and the thermocouples are more widely used [3][4][5][6][13][14][15][16]18,[21][22][23][24][25][26][27]29,31,[33][34]…”

Section: Common Systems and Literature Backgroundmentioning

confidence: 99%

“…The measuring systems always employ analog probes and the thermocouples are more widely used [3][4][5][6][13][14][15][16]18,[21][22][23][24][25][26][27]29,31,[33][34][35][36][37][38] with respect to the thermoresistances [17,19,20,28,34]. The number of probes installed that, as mentioned, depends on the size of the hot box, is very variable: some cases have less than 20 probes [13,16,19,20,27,28,38], most cases have a number of probes between 20 and 100 [4][5][6]14,15,[23][24][25]33,36], while in three cases there are more than 100 probes [34,35,...…”

Section: Common Systems and Literature Backgroundmentioning

confidence: 99%

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Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

et al. 2019

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In this paper, a novel integrated measuring and control system for hot box experiments is presented. The system, based on a general-purpose microcontroller and on a wireless sensors network, is able to fully control the thermal phenomena inside the chambers, as well as the heat flux that involves the specimen wall. Thanks to the continuous measurements of air and surfaces temperatures and energy input into the hot chamber, the thermal behavior of each hot box component is analyzed. A specific algorithm allows the post-process of the measured data for evaluating the specimen wall thermal quantities and for creating 2D and 3D thermal models of each component. The system reliability is tested on a real case represented by a double insulating X-lam wall. The results of the 72 h experiment show the system’s capability to maintain stable temperature set points inside the chambers and to log the temperatures measured by the 135 probes, allowing to know both the U-value of the sample (equal to 0.216 ± 0.01 W/m2K) and the thermal models of all the hot box components. The U-value obtained via hot box method has been compared with the values gathered through theoretical calculation and heat flow meter measurements, showing differences of less than 20%. Finally, thanks to the data postprocessing, the 2D and 3D thermal models of the specimen wall and of the chambers have been recreated.

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Section: Common Systems and Literature Backgroundmentioning

confidence: 99%

Section: Common Systems and Literature Backgroundmentioning

confidence: 99%

Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

et al. 2019

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“…En muchos trabajos en los que se mide la conductividad térmica de materiales aislantes, el método más común es el de placa caliente guardada, establecido por la norma ASTM C 1363 [7], [8]. En estos se establece un gradiente de temperatura constante por lo cual el flujo de calor a través de la muestra se mantiene en régimen estacionario.…”

Section: Ingeniería Y Cienciaunclassified

“…Gomes et al [11] usan dos métodos para comparar sus resultados: régimen estacionario y transitorio, obteniendo diferentes resultados con ambos métodos. Buratti et al [7] desarrollaron un equipo consistente en una caja con un panel caliente y otro frío, para caracterizar materiales compuestos obteniendo valores del CT en rangos adecuados para considerarlos como aislantes térmicos prometedores en remodelación de edificios. Por su parte Jannot et al [12] presentan un método de pulso de calor para medir el CT en materiales aislantes de baja densiing.cienc., vol.…”

Section: Ingeniería Y Cienciaunclassified

Medición de la conductividad térmica en materiales aislantes bajo régimen de flujo de calor no estacionario

2019

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101|Medición de la conductividad térmica en materiales aislantes bajo régimen de flujo de calor no estacionario construcción, el tamaño de las muestras a evaluar y el método de medida, comparado con los métodos tradicionales para medir este parámetro.Palabras clave: Conductividad térmica; flujo de calor; aislantes térmicos; incertidumbre; consumo energético; construcción de edificaciones. AbstractA device to measure thermal conductivity in thermal insulating solid materials commonly used in buildings was developed following a one-dimensional model of heat flow through a plate of the material to be evaluated. The temperature gradient between the plate faces was measured as a function of time by means of a set of type T thermocouples. A circuit with commercial microcontrollers was designed to control the instrument's mechanisms, the acquisition and the treatment of data. In preliminary tests with some materials, thermal conductivity values similar to those reported in the literature were obtained by using a linear adjustment with R values between 0.90 and 0.98. This device turns out to be a good instrument for measuring thermal conductivity because it has several advantages, such as: easy implementation, sample size, measurement method; compared to those using traditional methods.

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“…A significant part of Europe's building heritage is made up of old buildings [1][2][3][4] constructed using poor quality insulation materials. Therefore, recent regulations, such as the EU Directive 2010/31 [5] on buildings' energy efficiency, aim to increase energy efficiency standards, by considering both the single components and the entire building.…”

Section: Introductionmentioning

confidence: 99%

Seismic Retrofit Measures for Masonry Walls of Historical Buildings, from an Energy Saving Perspective

et al. 2018

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Abstract:The planning of energy saving and structural retrofit interventions on masonry buildings are usually two separate projects; combined interventions are rare. Solutions tackling both aspects can reduce total refurbishment costs and improve global building performance. However, heavy interventions on the envelope have to be carefully designed in order to improve both seismic and energy performance whilst mitigating environmental impact. National energy saving regulations are generally less strict for historical buildings, making this category of buildings very interesting not only because of their widespread diffusion across Italy but also because of the possibility of planning interventions that will allow significant improvements by combining building efficiency and safety. This research looks at these aspects and proposes new methods for refurbishing masonry buildings combining seismic improvements and energy saving interventions. Among those mostly commonly applied on masonry buildings in Italy, and described in this paper, are various combined retrofit interventions, and we report the results of these interventions on thermal transmittance reduction and global costs.

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Mechanical characterization and thermal conductivity measurements using of a new 'small hot-box' apparatus: innovative insulating reinforced coatings analysis

Abstract: Marco (2016) Mechanical characterization and thermal conductivity measurements using of a new 'small hot-box' apparatus: innovative insulating reinforced coatings analysis. Journal of Building Engineering, 7. pp. 63-70. ISSN 2352-7102 Published by: Elsevier URL:http://dx

Cited by 20 publications

References 18 publications

Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

Medición de la conductividad térmica en materiales aislantes bajo régimen de flujo de calor no estacionario

Seismic Retrofit Measures for Masonry Walls of Historical Buildings, from an Energy Saving Perspective

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