Insulated Glazed Units (IGUs) are composite elements formed by two or more glass panes held together by structural edge seals, entrapping a gas for thermal and acoustic insulation. There is a wealth of evidence that they are prone to cracking due to an uneven temperature distribution within each glass pane, caused in particular by solar radiation, enhanced by the shielding of contour-frame and cast shadows. The accurate assessment of the temperature field in the glass is the input datum to calculate the thermal strain and the consequent state of stress. An engineered method for calculating the temperature field in the glass panes of multiple IGUs, of arbitrary composition, is developed here. This method considers the various sources of thermal exchange: conduction between the exposed, shadowed and border regions of each pane, convection and radiation with the surrounding environment and between the panes, heat storage. Proper coefficients are defined for multiple reflective phenomena of radiant energy between the various glass layers. The proposed model is applied to explanatory case studies, accounting for the daily variations of the external temperature and solar radiation.

Engineered calculation of the uneven in-plane temperatures in Insulating Glass Units for structural design / Galuppi, L.; Maffeis, M.; Royer-Carfagni, G.. - In: GLASS STRUCTURES & ENGINEERING. - ISSN 2363-5150. - 7:1(2022), pp. 71-99. [10.1007/s40940-022-00169-x]

Engineered calculation of the uneven in-plane temperatures in Insulating Glass Units for structural design

Galuppi L.
;
Royer-Carfagni G.
2022-01-01

Abstract

Insulated Glazed Units (IGUs) are composite elements formed by two or more glass panes held together by structural edge seals, entrapping a gas for thermal and acoustic insulation. There is a wealth of evidence that they are prone to cracking due to an uneven temperature distribution within each glass pane, caused in particular by solar radiation, enhanced by the shielding of contour-frame and cast shadows. The accurate assessment of the temperature field in the glass is the input datum to calculate the thermal strain and the consequent state of stress. An engineered method for calculating the temperature field in the glass panes of multiple IGUs, of arbitrary composition, is developed here. This method considers the various sources of thermal exchange: conduction between the exposed, shadowed and border regions of each pane, convection and radiation with the surrounding environment and between the panes, heat storage. Proper coefficients are defined for multiple reflective phenomena of radiant energy between the various glass layers. The proposed model is applied to explanatory case studies, accounting for the daily variations of the external temperature and solar radiation.
2022
Engineered calculation of the uneven in-plane temperatures in Insulating Glass Units for structural design / Galuppi, L.; Maffeis, M.; Royer-Carfagni, G.. - In: GLASS STRUCTURES & ENGINEERING. - ISSN 2363-5150. - 7:1(2022), pp. 71-99. [10.1007/s40940-022-00169-x]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2933058
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