Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

JUNE 27 TUESDAY MORNING
JS1-TuM-INV.3 MULTILAYER COATINGS FOR OPTICAL AND ENERGETIC
CONTROL IN GLASSES. F. Villuendas. Departamento de Física Aplicada. Universidad de
Zaragoza. 50009, Zaragoza. Spain
Architectural trends in the last century drove the use of glass façades in construction, since they provide
a lightness aspect to the building, allow the inside-outside communication though the façade and
admit a great variation in the aesthetic aspect. However, the use of glass façades presents several disadvantages,
in particular energetic disadvantages, caused by energy conductive losses with values of
5,7 W/m 2 K in monolithic glass, and by the overheat produced by the excessive solar gain, with values
until 500 W/m 2 in south orientation.
The use of insulating glazing including multilayer sputtered coated glass avoids most of these inconveniences,
giving rise to the development of new products with optimized performances of thermal
isolation and energetic solar transmission. So, sputtering technologies and procedures for large area
glass coatings will be reviewed as the first point in this presentation.
Several coatings have been designed for optical and energetic control in buildings that are often included
in two big groups, solar control coatings that reduce solar transmission of the glazing and
low-emissivity coatings that reflect infrared radiation while they transmit visible light. Optical and
energetic characteristics are determined by absorptive and infrared reflective properties of metallic
layers together with interference conditions in dielectric layers, so that optical and energetic properties
will be dependent on material composition, multilayer structure and thickness of different layers.
Typical multilayer structures for both solar control and low-emissivity coatings will be presented,
showing the optical and energetic characteristics that can be achieved.
The design and development of new multilayer structures with specific energetic and optical properties
is the aim of research activities in our group, that has been carried out in collaboration with the
company Ariño-Duglass. Finally, we present the main features of the design and fabrication processes
followed for the development of several specific purpose coatings, including solar control and
low-emisivitty properties, with improved characteristics of different kinds as those concerning energetic
behaviour, thermal isolation, aesthetic aspect, colour reproduction or chromatic coordinates.
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