Clearview National July 2019 - Issue 212 | Page 59

GLASS&SEALEDUNITS
Castellana 77
A sustainable building with
a stunning glazed facade
» » IN THE HEART OF MADRID’S
financial centre, in the AZCA district, stands
Castellana 77, a building which, after two
decades out of service, has begun a new iconic
life thanks to luis vidal + arquitectos. The
original 1977 tower is now a 62-metre-high
office building, defining the skyline of the
city in its own special way. Over a total area
of 21,000m², architecture and construction
also included the upgrade of all the facilities
in Castellana 77, as well as the transformation
of its 18 floors above ground (16,261m² in
total).
With completion of the restoration,
the building is a leader in terms of energy
efficiency and environmental profile and
has received the prestigious LEED Platinum
certification.
Clever use of natural light and the desire
to create a strong identity for the building to
stand out in its environment were two of the
essential pillars for the architectural project.
This has been achieved with an integral
restoration, primarily focused on building a
new façade with a sharp vertical modulation
that utilises Guardian SunGuard® SN 70/41
coated glass in a high selectivity glazed curtain
wall.
This modern, inspiring construction
system also incorporates an added feature
that provides extra solar protection by using
fins with a 60cm overhang to provide shade
(separated from the main façade by a 15cm
gap for maintenance and cleaning). These
work in conjunction with Guardian glass to
further improve the general performance of
the building.
The curtain wall façade is made from an
extruded aluminium profile system and infill
panels made from laminated high selectivity
neutral coated glass with SunGuard SN 70/41
as the external pane. The SuperNeutral™ (SN)
family is one of the coated glass options in
the Guardian SunGuard high performance
architectural glass range. With 70% light
transmission, this solution provides a neutral
appearance with maximum solar control.
The façade system enables free ventilation
of glazing edges, which prevents unwanted
condensation.
LEED
sustainability
& certification
» » LEED IS ONE OF THE MOST
prestigious worldwide certifications
that evaluates the sustainable
behaviour of buildings, seeking to
promote environmentally-friendly, as
well as financially viable, comfortable
properties. The category of the
certification for Castellana 77 was
Platinum in the Core & Shell system.
This distinction was awarded to the
building, among other factors, on
account of:
Castellana 77. Building.
(© All photos © luis vidal + arquitectos.
All rights reserved, GRDPR168)
EFTE FINS FOR IMPROVED
ENERGY EFFICIENCY
Another poignant feature of the
architectural work at Castellana 77 are the
EFTE (Ethylene Tetra-Fluoro-Ethylene) fins,
which were specially designed for this project,
with a specific orientation and curvature to
allow them to flow through the skin of the
building, giving it a unique, distinctive shape.
Regardless of their aesthetic purpose, the
primary function of these fins is the continual
pursuit of improved energy efficiency and
sustainability, as they protect the structure
from direct exposure to the sun.
Ultimately, the façade of Castellana 77,
with SunGuard SN 70/41 glazed units and
EFTE fins, enables low-emissivity and high
solar control capacity. A rigorous study of the
building’s exposition to the sun and shade on
the west, east and south façades at different
critical times every day of the year, led to an
efficient design that enables significant energy
savings, as well as improved comfort and
wellbeing for the building’s occupants.
• Energy efficiency: the glazed façade
and solar protection fins, as well as
energy management and control
performance, result in maximum
thermal and lighting comfort for
occupiers of the building. This helps
to reduce energy consumption by
up to 33% per year, compared to
a conventional building with the
same usage and surface area. The air
conditioning and lighting systems are
46% and 34% lower respectively.
• Its natural lighting and access for
views: 95% of workers and occupiers
of Castellana 77 receive natural light
and have direct views of the outside.
• The quality of the interior
atmosphere: with an energy efficient
air-conditioning system based on
100% exterior air intake.
• Its location and wide range of
transport options to access the
building.
• The efficient use of water by adding
efficient bathroom facilities so that
the building can achieve a 39%
reduction in water consumption,
compared to other similar buildings.
• Its sustainability awareness: since
its restoration, the building uses
primarily recycled materials of
certified local origin.
• Its low or zero emissions: the use of
100% of the materials have no (or
little) volatile organic emissions.
C L E A RV I E W-U K . C O M » J U L 2019 » 59