Transactions of Nanjing University of Aeronautics & Astronautics
Influence of Patch Side of Heat-Ray Absorbing Film on One-Dimensional Unsteady Thermal Stresses in Window Glass
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Abstract:
Heat-ray absorbing film is used to be bonded on the existing sheet glasses of the windows. It is effective for air-conditioning energy saving against the global warming, because it absorbs heat-ray in the thin film and decreases the incoming heat-ray into the room. On the other hand, the sheet glasses increase the temperature at the surface which the sheet is bonded and sometimes yield heat cracks by thermal stresses. It is important to know the state of thermal stresses accurately in order to develop the heat-ray absorbing film with higher performance and without heat cracks. In this paper, the analysis model is treated as the two-layer plate of the conventional soda sheet glass and the heat-ray absorbing film with different absorptivities. The unsteady temperature and thermal stresses are analyzed and calculated numerically. The influence of the patch side, which the heat-ray absorbing film is bonded at the exterior side or the interior side, on the heat-ray absorbing performance and the thermal stresses is discussed. It is found that the alternative patch side has no effect on the heat-ray absorbing performance and that the patch side is recommended to be interior side from a view point of decreasing thermal stresses against the heat crack of glasses.
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