A comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance

Albatici, Rossano; Tonelli, A. M.; Chiogna, Michela

doi:10.1016/j.apenergy.2014.12.035

Cited by 164 publications

(134 citation statements)

References 16 publications

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“…Eq. [1] implies that, apart from the thermal properties of the material being inspected, the logarithmic response of the decay will be a straight line having a slope of 1 2 − for an ideal material, and above a defect-free (or sound) area. In real conditions, the exact behavior of the ln[T(t)](ln(t)) temperature evolution, will be different due to variable parameters.…”

Section: Hybrid Irt Approachmentioning

confidence: 99%

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Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

Сфарра¹,

Marcucci²,

Ambrosini³

et al. 2016

Mater. construcc.

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Up to now, infrared thermographic approaches have been considered either passive or active. In the latter case, the heat flux is historically attributed to a non-natural heat source. The use of the sun has recently been incorporated into the active approach thanks to multi-temporal inspections. In this paper, an innovative hybrid thermographic (HIRT) approach is illustrated. It combines both the time component and the solar source to obtain quantitative information such as the defect depth. Thermograms were obtained by inspecting the facade of the Santa Maria Collemaggio church (L'Aquila, Italy), whereas quantitative results related to the sub-superficial discontinuities were obtained thanks to the use of advanced techniques. Experimental results linked to passive approach (i.e., the mosaicking procedure of the thermograms) performed by selecting a set of historic churches are also included in order to explain, when and where, the hybrid procedure should be used. RESUMEN: Exploración infrarroja del patrimonio arquitectónico: de la termografía infrarroja pasiva al enfoque de la termografía infrarroja híbrida (HIRT).Hasta la fecha, los enfoques sobre la termografía infrarroja han sido considerados, o pasivos, o activos. En este último caso, el flujo de calor se obtiene a través de una fuente de calor no natural. El uso de energía solar ha sido recientemente incorporado al enfoque activo gracias a los estudios multitemporales. En este trabajo, se ilustra un enfoque innovador de la termografía híbrida (HIRT). Se combina tanto el componente de tiempo y la fuente de energía solar para recuperar la información cuantitativa así como la profundidad del defecto. Las imágenes térmicas se obtuvieron mediante el análisis de la fachada de la Iglesia de Santa María Collemaggio (L'Aquila, Italia), mientras que los resultados cuantitativos inherentes a las discontinuidades sub-superficiales se obtuvieron gracias al uso de otras técnicas avanzadas. Los resultados experimentales vinculados al enfoque pasivo (es decir, el proceso de mosaico de las imágenes térmicas) derivan de un conjunto de Iglesias antiguas, también incluidas en el estudio, a fin de explicar cuándo y dónde tiene sentido realizar un proceso híbrido.

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Section: Hybrid Irt Approachmentioning

confidence: 99%

“…Recently, the use of thermographic quantitative procedures for the inspection of buildings has been generally applied to study thermal properties, such as the transmittance parameter (1)(2)(3)(4)(5).…”

Section: Introductionmentioning

confidence: 99%

Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

Сфарра¹,

Marcucci²,

Ambrosini³

et al. 2016

Mater. construcc.

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“…Annual heating and electric energy consumption values have been collected, by randomly surveying the behaviour of the apartment occupants. c Thirdly, the building envelope thermal performance has been evaluated by measuring walls thermal transmittance with infrared thermography methodology developed by the researcher in an earlier work [17]. This procedure, apart from giving a numerical value of the wall transmittance, helped verify the building deterioration and the presence of thermal bridges or air leakages, by the use of indoor thermography.…”

Section: Analysis Of the Building And Its Equipment And Energy Classimentioning

confidence: 99%

“…The first phase consisted in the setting up of a novel methodology for a simple and fast definition of the actual thermal characteristics of the buildings by means of on-site surveys (see [17] for further information). The second step applied the methodology to a selected group of buildings in order to stress the pros and cons of the existing and more complex methodologies.…”

Section: Aim Of the Researchmentioning

confidence: 99%

A Decision Making Tool for a Comprehensive Evaluation of Building Retrofitting Actions at the Regional Scale

et al. 2016

Self Cite

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Buildings in Europe account for 40% of total primary energy consumption and 36% of CO 2 emissions. Nearly one-half of the building stock was built before modern energy efficiency standards and need urgent renovation. Urban retrofitting has emerged as a crucial factor for bringing about a radical change, the new construction rate being lower than 1%. Nevertheless, an accepted and consolidated methodology for refurbishing the existing housing stock is still lacking. The study presents an operating methodology for the optimization of the retrofitting process, based on energy efficiency and cost-effectiveness, as well as users' comfort, in the building asset of ITEA SpA, the social housing institute for the Province of Trento (Italy), which manages more than 600 buildings. The research consists of the following stages: (1) definition of building classes, similar in age, dimension, typology, construction system and location; (2) analysis of plant systems and recognition of cases significant for classifying buildings in term of energy class; (3) identification of possible improvements and related cost-benefits; and (4) extension of the results to the whole building class. A tool is here proposed, intended for use by ITEA in order to set medium-and long-term plans. The tool does not consider only the effective sustainability of the controlling body intervention but also the final users' full satisfaction.

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“…Several researchers have proposed the use of quantitative thermography for a rapid in situ measurement of the overall transmittance of an envelope building in a short time [4]. Albatici and Tonelli [5,6] use a technique that involves parameters measured by infrared thermography, except for the wind velocity which is measured by a hot-wire anemometer in proximity of the wall. Differences with U-values determined by the HFM are of the order of 30%, while differences with calculated U-values can grow up to 80%.…”

Section: Introductionmentioning

confidence: 99%

Alternative Method for on Site Evaluation of Thermal Transmittance

2017

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A comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance

Cited by 164 publications

References 16 publications

Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

Infrared exploration of the architectural heritage: from passive infrared thermography to <em>hybrid</em> infrared thermography (HIRT) approach

A Decision Making Tool for a Comprehensive Evaluation of Building Retrofitting Actions at the Regional Scale

Alternative Method for on Site Evaluation of Thermal Transmittance

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