ENERGY FACT: BURNING 1 GALLON OF GASOLINE THAT DOES NOT CONTAIN
ETHANOL PRODUCES ABOUT 19.64 POUNDS OF CARBON DIOXIDE. FOR DIESEL
FUEL, THAT NUMBER GOES UP TO 22. 38 POUNDS.
suitable. On the south facade, having an
overhang could shield high-angle summer
sun while letting in beneficial solar gains
from the low-angle sun in the winter.”
Window size and the weight of shading
devices also limit your choices – some
shading products may not be available in
large enough sizes for bigger windows,
and you need to make sure your building
can handle the added weight.
To help narrow down the options,
Pau recommends gathering input from
building occupants on what does and
doesn’t work about your current setup.
Ask them to weigh in on which areas need
improvement, Pau says: “For example,
limiting solar heat gain, cutting down on
After the Installation
The upkeep for external shading varies
widely by the type of device you chose,
Add Smart Shading to Solar Strategies continued from page 9
notes Bruce McKinlay, project director
Fixed shading devices generally have a
service life of 25-35 years, similar to other
facade components, while fabric shades
last closer to 15-20 years.
“Automated and operable shading
devices have the lowest service life
and require the most maintenance,”
McKinlay explains. “Lifecycle costs vary
significantly but are ultimately evaluated
by comparing the energy cost savings
and HVAC equipment reduction to the
additional first cost and maintenance
cost of the shading device. However,
an exterior shading device is selected
to allow greater transparency while
maintaining good energy efficiency and
Janelle Penny janelle.penny@buildings.
com is senior editor of BUILDINGS.
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“The site location is one of the first
considerations because it defines the
climate, local customs, and industry
capabilities or limitations,” explains Pau.
“For example, are there hurricanes to
contend with? What level of solar gains
are we dealing with and how much do
we need to cut down by? Are we limited
by certain materials that area contractors
feel more comfortable working with? Do
certain shading devices fit in better with
The building’s orientation is also
an important factor because different
orientations experience the sun in
different ways, Pau adds.
“An east-facing window receives direct
morning sun, so perhaps a more uniform
shading device makes more sense than
an overhang,” says Pau. “If we wanted to
open up the east facade after the morning
sun has passed, then perhaps an internal
roller or venetian blind would be more