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Proceedings Paper

IRT analysis on historic buildings: toward a controlled convection heating
Author(s): Elisabetta Rosina; Nicola Ludwig; Veronica Redaelli; Stefano Della Torre; Simona D'Ascola; Michela Catalano; Chiara Faliva
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Paper Abstract

Many applications of IRT on buildings require active approach. The solicitation has to be properly calculated, and the application has to take in account the optical characteristics of the surface and its thermal properties. In fact, non-homogeneities of the surface definitively affect the absorbance and reflectance of materials, as shown in literature. Therefore, in case of different colors like artistic paintings, dark stains and salts deposition a convection heating results more effective for IRT inspection, because it does not stimulate different localized absorption due to the colors. Using fan coil heaters, major difficulty is to obtain an even heating on the wall under inspection. The laboratory tests permitted to verify that the strength of rising warm air is higher than the one due to the heater ventilation. As a consequence, the effects of heating on the wall start from the upper part and decrease in a non-proportional way to the bottom. On the other side, thermal flux from a heater changes direction according to the geometry of the room, ambient conditions (initial temperature of the air, openings, etc), technical characteristics of the heater (power, speed of the fan, shape, etc) and its location (orientation, elevation, distance from the surface under investigation, etc). In addition, the increase of air temperature does not directly correspond to the increase of the surface temperature. The paper shows the characterization of a convective heating source, by laboratory measurements; to map the distribution of heat in time, the 14.000-26.000 kcal/h heater flux was measured following a 3D grid, by anemometers, probes, and IR Thermography.

Paper Details

Date Published: 28 March 2005
PDF: 11 pages
Proc. SPIE 5782, Thermosense XXVII, (28 March 2005); doi: 10.1117/12.604646
Show Author Affiliations
Elisabetta Rosina, Politecnico di Milano (Italy)
Nicola Ludwig, Univ. degli Studi di Milano (Italy)
Veronica Redaelli, Univ. degli Studi di Milano (Italy)
Stefano Della Torre, Politecnico di Milano (Italy)
Simona D'Ascola, Politecnico di Milano (Italy)
Michela Catalano, Politecnico di Milano (Italy)
Chiara Faliva, Politecnico di Milano (Italy)


Published in SPIE Proceedings Vol. 5782:
Thermosense XXVII
G. Raymond Peacock; Douglas D. Burleigh; Jonathan J. Miles, Editor(s)

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