Energy savings with Solar Protection
Useful heat saving by solar and glare protection systems
The graph shows the percentage of useful heat saving by solar and glare protection systems in residential buildings according to experimental
setups and Fraunhofer IBP calculations. Chart: R+T markets, source: simulated calculations Fraunhofer IBP/ViS
R+T markets 2018 45
The result of the investigations at the VERU building: With
the help of the selected systems, improvements to the heat
transition coefficient (U value) of typical old and new construc -
tion glazing are possible between 13 percent and 5 percent
(roller blinds) and 46 percent and 25 percent (pleated blinds).
SAVE ENERGY IN WINTER
Using the example of a single-family house, simulated calculations
showed that closed internal solar shading systems
during night hours reduce a building's heat requirements by
up to seven percent per year, depending on the glazing, climate
and building condition (see diagram). Since the greatest
savings were achieved in windows with low-insulation glazing,
there are considera ble ene rgy saving poten tia ls, es -
pecially in old buildings.
The results of the calculations for an office building were even
more pronounced. If, during the winter months, an internal
sun and glare protection system was used instead of an external
one, savings of between 6 % and 25 % could be achieved
depending on the boundary conditions. In addition, the
res earch ers used t he sun and glare protectio n as nightly,
temporary heat protection, e.g. the pleated blinds, allowed a
further reduction by five percent.
HOW DOES THIS REFLECT DUETTE?
On the basis of this study, Hunter Douglas had his own products
investigated in 2011 – pleated blinds with different textile
properties and for different mounting situations. The re sult:
The selected systems improve the heat transition coefficient
of typical old and new construction glazing by up to 55 percent.
34 percent is measured for Duette 32 Blackout in the
glass strip. Thick substances and the assembly in the glass strip
provided the best values in residential construction. The heat
demand for a selected single-family house per year decreased
by up to twelve percent according to these calcula tions. Savings
of between 4.5 percent and 32 percent were achieved
in office buildings. An additional use of solar shading for
nightly, temporary heat protection allowed further useful heat
savings of up to twelve percent (Duette 64 Blackout).
Energetic quality of
Savings potential by nightly closing
Blind Pleated with Perlex
Two-pane heat pro -
tection glazing new
Three-pane heat protection
Insulated glass window
Useful heat demand
without solar protection
Internal solar shading systems (here it’s Luxaflex) help saving energy.