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Articles de revues sur le sujet « Passive building thermography »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 6 février 2022

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Kavuru, Manogna, et Elisabetta Rosina. « Developing Guidelines for the Use of Passive Thermography on Cultural Heritage in Tropical Climates ». Applied Sciences 10, n^o 23 (26 novembre 2020) : 8411. http://dx.doi.org/10.3390/app10238411.

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Infrared thermography (IRT) has been a very successful tool for the diagnosis and monitoring of cultural heritage restoration projects. It has been used to identify anomalies, moisture issues, etc., in historic buildings. Although it is a promising tool, one of the limitations is that a method to deploy it onsite has not been standardized. This is due to the different variables that might affect thermal signatures captured by the thermal camera, when onsite. Especially since environmental conditions play a major role in thermography, the process must vary from region to region significantly. That said, efforts have been made over the years to establish some base standards for designated purposes of infrared thermography in the construction field. These standards and best practice methods, although comprehensive, do not effectively help with issues that are contextual to the location of the building, for instance, tropical climates, such as India. This paper aims to suggest guidelines for a passive approach of thermography, based on practical applications and procedures followed during the thermographic survey at the former British Residency in Hyderabad, India. Additionally, this paper explores the avenues through which region specific guidelines can be established.

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Brooke, Christopher. « Thermal Imaging for the Archaeological Investigation of Historic Buildings ». Remote Sensing 10, n^o 9 (3 septembre 2018) : 1401. http://dx.doi.org/10.3390/rs10091401.

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A significant problem in understanding the archaeology of standing buildings relates to the proscription to uncover features and structures within plastered and rendered walls due to the susceptibility and historic importance of such structures. Infrared thermography offers a method of visualization that is nondestructive and capable of revealing various types of archaeological anomaly that has been demonstrated on a small scale in the past. A passive infrared thermal camera is used to examine several historic buildings that are known or suspected to contain hidden archaeological information; the technique is also presented on complex, exposed historic building fabric. The results confirm that it is possible to detect various types of man-made anomaly and to differentiate building materials. In consequence, the use of passive thermal infrared imaging is shown to be a valuable tool in the examination and recording of historic buildings and structures.

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Tejedor, Blanca, Kàtia Gaspar, Miquel Casals et Marta Gangolells. « Analysis of the Applicability of Non-Destructive Techniques to Determine In Situ Thermal Transmittance in Passive House Façades ». Applied Sciences 10, n^o 23 (24 novembre 2020) : 8337. http://dx.doi.org/10.3390/app10238337.

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Within the European framework, the passive house has become an essential constructive solution in terms of building efficiency and CO2 reduction. However, the main approaches have been focused on post-occupancy surveys, measurements of actual energy consumption, life-cycle analyses in dynamic conditions, using simulation, and the estimation of the thermal comfort. Few studies have assessed the in situ performance of the building fabric of passive houses. Hence, this paper explores the applicability of non-destructive techniques—heat flux meter (HFM) and quantitative infrared thermography (QIRT)—for assessing the gap between the predicted and actual thermal transmittance of passive house façades under steady-state conditions in the Mediterranean climate. Firstly, the suitability of in situ non-destructive techniques was checked in an experimental mock-up, and, subsequently, a detached house was tested in the real built environment. The findings revealed that both Non-Destructive Testing (NDT) techniques allow for the quantification of the gap between the design and the actual façades U-value of a new passive house before its operational stage. QIRT was faster than the HFM technique, although the latter was more accurate. The results will help practitioners to choose the most appropriate method based on environmental conditions, execution of the method, and data analysis.

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Karpov, Denis, Mikhail Pavlov, Liliya Mukhametova et Anton A. Mikhin. « Features and results of assessment the thermal conductivity of building materials and products by the active method of thermal non-destructive testing ». E3S Web of Conferences 220 (2020) : 01053. http://dx.doi.org/10.1051/e3sconf/202022001053.

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Thermal control (passive and active) is a non-destructive testing method. During passive thermal control, the test object is characterized by a temperature field formed during its operation. In active thermal control, the test object is additionally thermally stimulated. This technique is widely used in various areas of construction, energy, mechanical engineering, transport. This paper proposes a variant of active thermal non-destructive assessment of the thermal conductivity coefficient of building materials and products on the example of a fragment of a building structure made of silicate bricks. The test object is subjected to thermal stimulation by an external source of thermal energy before reaching a steady-state thermal regime. Thermography of the test object surfaces is carried out. The average integral temperatures of surfaces or individual sections of the test object are calculated. The coefficient of thermal conductivity of the test object is determined, which is used to calculate its thermal resistance (resistance to heat transfer). After that, the coefficient of heat transfer is calculated. The method was implemented in laboratory conditions. It can be used in natural and operational conditions for accurate and quick determination of the key thermophysical properties of building materials and products.

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Ortiz-Sanz, Juan, Mariluz Gil-Docampo, Marcos Arza-García et Ignacio Cañas-Guerrero. « IR Thermography from UAVs to Monitor Thermal Anomalies in the Envelopes of Traditional Wine Cellars : Field Test ». Remote Sensing 11, n^o 12 (14 juin 2019) : 1424. http://dx.doi.org/10.3390/rs11121424.

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Infrared thermography (IRT) techniques for building inspection are currently becoming increasingly popular as non-destructive methods that provide valuable information about surface temperature (ST) and ST contrast (delta-T). With the advent of unmanned aerial vehicle (UAV)-mounted thermal cameras, IRT technology is now endowed with improved flexibility from an aerial perspective for the study of building envelopes. A case study cellar in Northwest (NW) Spain is used to assess the capability and reliability of low-altitude passive IRT in evaluating a typical semi-buried building. The study comparatively assesses the use of a pole-mounted FLIR B335 camera and a drone-mounted FLIR Vue Pro R camera for this purpose. Both tested IRT systems demonstrate good effectiveness in detecting thermal anomalies (e.g., thermal bridges, air leakages, constructive singularities, and moisture in the walls of the cellar) but pose some difficulties in performing accurate ST measurements under real operating conditions. Working with UAVs gives great flexibility for the inspection, but the angle of view strongly influences the radiometric data captured and must be taken into account to avoid disturbances due to specular reflections.

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Карпов, Д., et Denis Karpov. « THE ACTIVE METHOD OF CONTROL THE THERMAL CONDUCTIVITY OF BUILDING MATERIALS AND PRODUCTS ». Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, n^o 7 (21 juillet 2019) : 57–62. http://dx.doi.org/10.34031/article_5d35d0b79c34c5.75173950.

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Thermal control refers to non-destructive testing methods. There are passive and active thermal non-destructive testing. With passive thermal control, the test object is characterized by a temperature field formed during its operation. With active thermal control, an additional source of thermal stimulation of the controlled object is used. Thermal control is widely used in various sectors of construction, energy, engineering and transport. The paper proposes a variant of active thermal non-destructive control of thermal conductivity coefficient of building materials and products on the example of a fragment of a building structure made of silicate bricks. The controlled object is subjected to thermal stimulation by an external source of thermal energy until the fixed thermal regime. Thermography of the test object surfaces is performed. The average values of surfaces temperature or individual sections of controlled object are calculated. The heat equation determines a controlled parameter - the heat coefficient of the object under control. The thermal resistance (heat transfer resistance) of the controlled object is calculated with a known coefficient of thermal conductivity. The heat transfer coefficient is calculated with a known coefficient of thermal resistance (heat transfer resistance). The method is implemented in the laboratory. It can be used in field and operating conditions for accurate and rapid determination of the key thermal properties of building materials and products.

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Sham, Janet F. C., Wallace W. L. Lai, Wing Chan et Chee Lin Koh. « Imaging and condition diagnosis of underground sewer liners via active and passive infrared thermography : A case study in Singapore ». Tunnelling and Underground Space Technology 84 (février 2019) : 440–50. http://dx.doi.org/10.1016/j.tust.2018.11.013.

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Ibarra-Castanedo, Clemente, Matthieu Klein, Martin Lavoie, Denis Proteau et Jean Dumoulin. « Evaluation of Impact of Hot-Mix Asphalt Density Differentials on Thermal Streak Phenomenon by Passive Infrared Thermography ». Journal of Materials in Civil Engineering 31, n^o 10 (octobre 2019) : 04019215. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0002822.

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Garrido, Iván, Mercedes Solla, Susana Lagüela et Norberto Fernández. « IRT and GPR Techniques for Moisture Detection and Characterisation in Buildings ». Sensors 20, n^o 22 (10 novembre 2020) : 6421. http://dx.doi.org/10.3390/s20226421.

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The integrity, comfort, and energy demand of a building can be negatively affected by the presence of moisture in its walls. Therefore, it is essential to identify and characterise this building pathology with the most appropriate technologies to perform the required prevention and maintenance tasks. This paper proposes the joint application of InfraRed Thermography (IRT) and Ground-Penetrating Radar (GPR) for the detection and classification of moisture in interior walls of a building according to its severity level. The IRT method is based on the study of the temperature distribution of the thermal images acquired without an application of artificial thermal excitation for the detection of superficial moisture (less than 15 mm deep in plaster with passive IRT). Additionally, in order to characterise the level of moisture severity, the Evaporative Thermal Index (ETI) was obtained for each of the moisture areas. As for GPR, with measuring capacity from 10 mm up to 30 cm depth with a 2300 MHz antenna, several algorithms were developed based on the amplitude and spectrum of the received signals for the detection and classification of moisture through the inner layers of the wall. In this work, the complementarity of both methods has proven to be an effective approach to investigate both superficial and internal moisture and their severity. Specifically, IRT allowed estimating superficial water movement, whereas GPR allowed detecting points of internal water accumulation. Thus, through the combination of both techniques, it was possible to provide an interpretation of the water displacement from the exterior surface to the interior surface of the wall, and to give a relative depth of water inside the wall. Therefore, it was concluded that more information and greater reliability can be gained by using complementary IRT-GPR, showing the benefits of combining both techniques in the building sector.

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Barreira, Eva, Ricardo M. S. F. Almeida et Mariana Moreira. « An infrared thermography passive approach to assess the effect of leakage points in buildings ». Energy and Buildings 140 (avril 2017) : 224–35. http://dx.doi.org/10.1016/j.enbuild.2017.02.009.

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Edis, Ecem, Inês Flores-Colen et Jorge de Brito. « Passive Thermographic Inspection of Adhered Ceramic Claddings : Limitation and Conditioning Factors ». Journal of Performance of Constructed Facilities 27, n^o 6 (décembre 2013) : 737–47. http://dx.doi.org/10.1061/(asce)cf.1943-5509.0000365.

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Bison, Paolo, Alessandro Bortolin, Gianluca Cadelano, Giovanni Ferrarini, Fabio Peron, Piercarlo Romagnoni et Antonio Stevan. « Indoor monitoring of Scrovegni Chapel Crypt ». E3S Web of Conferences 111 (2019) : 02075. http://dx.doi.org/10.1051/e3sconf/201911102075.

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The indoor microclimate of the Scrovegni Chapel in Padova (Italy) was analysed first in the ‘80s. The early study operates in the best way for what concerns the choice of measurement devices and their positioning. Starting from 1995 a Scientific-technical Board coordinates the various initiatives commissioned for the surveys of a conservation of the Scrovegni building structures and for the preservation of frescos. However only during the last ten years, the activities of the Board have been addressed also on the study of the hypogeal environments under the Chapel and in the external environment around it in order to prevent possible damage due to the presence of water which frequently submerges the floor and part of the vertical structures of the crypt (perimeter walls and brick partitions). The investigations have been therefore extended to the crypt. The present work reports the preliminary results of the cyclical survey campaign launched last year and still ongoing: passive thermographic techniques (non-invasive and non-destructive) have been used for the identification and the investigation of the relationship between the boundary seasonal thermohygrometric conditions and the rainfall variations and other exogenous phenomena related to the complex water system of the area on which the Scrovegni Chapel stands.

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Larbi Youcef, M. H. A., V. Feuillet, L. Ibos et Y. Candau. « In situ quantitative diagnosis of insulated building walls using passive infrared thermography ». Quantitative InfraRed Thermography Journal, 23 août 2020, 1–29. http://dx.doi.org/10.1080/17686733.2020.1805939.

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Edis, Ecem, Inês Flores-Colen et Jorge De Brito. « Time-Dependent Passive Building Thermography for Detecting Delamination of Adhered Ceramic Cladding ». Journal of Nondestructive Evaluation 34, n^o 3 (29 juillet 2015). http://dx.doi.org/10.1007/s10921-015-0297-5.

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Edis, Ecem, Inês Flores-Colen et Jorge De Brito. « Building Thermography : Detection of Delamination of Adhered Ceramic Claddings Using the Passive Approach ». Journal of Nondestructive Evaluation 34, n^o 1 (18 novembre 2014). http://dx.doi.org/10.1007/s10921-014-0268-2.

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