Infrared thermography for the investigation of dynamic thermal behaviour of opaque building elements: Comparison between empty and filled with hemp fibres prototype walls

Aversa, P.; Palumbo, Davide; Donatelli, Antonio; Tamborrino, R.; Ancona, F.; Galietti, Umberto; Luprano, V.A.M.

doi:10.1016/j.enbuild.2017.07.055

Cited by 24 publications

(17 citation statements)

References 18 publications

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“…Aversa et al [109] proposed an innovative experimental procedure to investigate the thermal dynamic behavior of two prototype walls (an empty wall and a hemp fiber-filled wall) in terms of decrement factor and time lag. For the correct implementation of the method, it is necessary to ensure: (i) thermal stimulation by means of a heat source, focused in the centre of the wall of the prototype; (ii) conditioning of the test room over the duration of the test to ensure a constant indoor temperature; (iii) application of a periodic square wave signal for three cycles − for this purpose, lamps were turned on for 4 hours and turned off for another 4 hours (the total duration of the wall stimulation was 24 hours); (iv) simultaneous acquisition on the two wall surfaces, through two infrared cameras; (v) analysis of the thermographic data.…”

Section: System and Equipment Components And Their Characteristicsmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

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The experimental characterization of the overall thermal transmittance of homogeneous, moderately-and non-homogeneous walls, windows, and construction elements with innovative materials is very important to predict their thermal performance. It is also important to evaluate if the standard calculation methods to estimate the U-value of new and existing walls can be applied to more complex configurations, since the correct estimation of this value is a critical requirement when performing building energy simulations or energy audit. This paper provides a survey on the main methods to measure the thermal transmittance and thermal behaviour of construction elements, considering laboratory conditions and in-situ non-destructive measurements. Five methods are described: the heat flow meter (HFM); the guarded hot plate (GHP); the hot box (HB), considering the guarded HB (GHB) and the calibrated HB (CHB); and the infrared thermography (IRT). Then, previous studies dedicated to the assessment of the thermal performance of different heavy-and light-weight walls are discussed. Particular attention is devoted to the measurement of the U-value of nonhomogeneous walls, including the effect of thermal bridging caused by steel framing or mortar joints, and the presence of PCMs or new insulation materials in the configuration of the walls. hot box; calibrated hot box; infrared thermography. Highlights: -Review on the main methods to measure the U-value of non-homogeneous walls. -Methods: heat flow meter, guarded hot plate, guarded and calibrated hot box, infrared thermography. -Standards framework and discussion of the main advantages and drawbacks of each method. -Description of methodologies and working principles of laboratory and in-situ measurements. -Measurement of the thermal transmittance of different heavy-and light-weight walls.

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Section: System and Equipment Components And Their Characteristicsmentioning

confidence: 99%

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Soares

Martins

Gonçalves

et al. 2019

Energy and Buildings

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“…The laboratory measurement method used to study the thermal dynamic behaviour of the wall is adopted from Aversa [54]. Originally, Aversa used an infrared thermography method to investigate the thermal behaviour of an opaque building component.…”

Section: Methodsmentioning

confidence: 99%

Characterising thermal behaviour of buildings and its effect on urban heat island in tropical areas

Wonorahardjo

Sutjahja

Mardiyati

et al. 2019

Int J Energy Environ Eng

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The heat island phenomenon in major cities is partly due to the excessive use of concrete and brick, which causes many problems regarding thermal comfort and energy expenditure. The thermal behaviour of the envelope wall material depends on its density, heat capacity, and thermal conductivity, and its effect on the heat island intensity (HII) is reported in this paper. Experiments and simulations were carried out on the four most popular building materials: brick, aerated concrete, wood with glass-wool insulation, and glass fibre-reinforced concrete with glass-wool insulation, with each material having a dimension of 1 m × 1 m. Experiments to analyse the thermal behaviour of the wall materials were performed by exposing each material to heat radiation from 2 × 1000 W halogen lamps for 4 h, followed by 4 h of cooling. The HII simulations were carried out in a simple urban kampong in a tropical area using Energy2D software. Heat flow analyses confirmed the thermal behaviour of the four walls, which can be categorised into two types: heat storage of block wall (BW) type and heat flow inhibition of insulated sandwich wall (ISW) type. The BW type showed 0.32 °C higher indoor air temperature than the ISW type, while the HII simulation showed ISW to be 0.74 °C higher than BW; however, both types increase the intensity and need mitigation treatment. The results of this study are important for the technological approach for dealing with local warming to lower the energy expenditure of poor people in an urban area. Keywords Urban heat island • Thermal behaviour • Block wall type • Insulated sandwich wall • Urban kampong List of symbols ρ Density c Specific heat κ Thermal conductivity avg Average density c avg Average specific heat avg Average thermal conductivity T so Outer surface temperature T si Inner surface temperature T m1 Temperature of the core wall at a depth of 2.5 cm T m2 Temperature of the core wall at a depth of 7.5 cm T m3 Temperature of the core wall at a depth of 12.5 cm P so Heat flow at outer surface P m1 Heat flow at a depth of 2.5 cm P m2 Heat flow at a depth of 7.5 cm P m3 Heat flow at a depth of 12.5 cm P si Heat flow at inner surface T ao Outdoor air temperature T ai Indoor air temperature T ac Outdoor air temperature above the canopy layer

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“…Among the thermal properties, the thermal transmittance, thermal diffusivity, thermal resistance, thermal capacity, heat transfer coefficient, and conductivity stand out. Aversa et al (2017) proposes the experimental study on the thermal behavior of opaque walls. They used active thermography stimulated with the objective of evaluating the effectiveness in a dynamic behavior for walls prototypes as well as verifying its success for application in situ.…”

Section: Methodology Main Conclusionmentioning

confidence: 99%

“…The European Directive 2010/31/EU (European Parliament and ff The Council, 2010) provides a description of how energy efficiency of buildings has a role in achieving near zero consumption. Aversa et al (2017) state that "for this to occur, energy analysis or auditing is an effective and rapid tool for new constructions, projects and in decision-making on the energy renovation of existing buildings often characterized by inefficiencies that lead to waste of energy". Due to the launching of the Performance Standard in Brazil, the NBR 15575 (ABNT, 2013), thermal comfort is presented in discussions.…”

Section: Thermal Performance Of Wallsmentioning

confidence: 99%

O uso da termografia infravermelha para o estudo do desempenho térmico de paredes: revisão bibliográfica

Silva

Batista

Póvoas

2019

Revista de la Asociación Latinoamericana de Control de Calidad,

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Este artigo tem por objetivo apresentar a utilização datermografia infravermelha em paredes de alvenaria no auxílio do desempenho térmico. Foi realizado uma revisão sistemática através de pesquisa com busca automática e snow-balling, seleção e peneiramento dos artigos para restringir os artigos ao tema desejado. Após isto, foi estudado sobre a termografia infravermelha nas manifestações patológicas, as propriedades térmicas e seu comportamento, pontes térmicas, diferença de temperatura e infiltrações de ar. De uma forma geral é necessário ter alguns cuidados durante a execução dos experimentos e medições. Ademais foi mostrado que a termografia infravermelha é uma técnica complexa e precisa de ser utilizada.

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Infrared thermography for the investigation of dynamic thermal behaviour of opaque building elements: Comparison between empty and filled with hemp fibres prototype walls

Cited by 24 publications

References 18 publications

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

Characterising thermal behaviour of buildings and its effect on urban heat island in tropical areas

O uso da termografia infravermelha para o estudo do desempenho térmico de paredes: revisão bibliográfica

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