A photochromic single glass pane

The transmittance of a photochromic (PC) window is reduced in sunlight but returns to its original value in the dark similar to photo-sensitive sun glasses. A 30 cm × 30 cm double glazed window containing a PC multi-layer coating on a single glass pane has been developed. A single PC glass pane can...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2018-11, Vol.186, p.111-114
Main Authors: Hočevar, Mateja, Opara Krašovec, Urša
Format: Article
Language:English
Subjects:
Chemical synthesis
Chemistry
Electrolytes
Glass
Heat transfer
Heat transfer coefficients
Multilayers
Organic chemistry
Photochromism
Smart materials
Sol-gel processes
Solar radiation
Solids
Transmittance
Windows (computer programs)
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Summary:The transmittance of a photochromic (PC) window is reduced in sunlight but returns to its original value in the dark similar to photo-sensitive sun glasses. A 30 cm × 30 cm double glazed window containing a PC multi-layer coating on a single glass pane has been developed. A single PC glass pane can be used to build a window with a low heat transfer coefficient, e.g. double or triple glazed unit, using existing technology. To develop the PC glass with a multi-layered coating that combines chromogenic and photoactive materials we employed sol-gel chemistry approaches and up-scaled the synthesis. Double glazed windows have been assembled using PC glass with two different layer configurations. The transmittance (Tvis) was reduced from 76% to 35% under outdoor solar radiation (750 W/m2) within 15 min.
ISSN:0927-0248
DOI:10.1016/j.solmat.2018.06.035