 Now,
architects need not restrict overhead glazing and natural
daylighting to control excessive solar heating. Polygal's
revolutionary RFX Polycarbonate Structured Sheet offers a unique
and economical means of achieving effective daily or seasonal
passive control of solar heat gain with a patented array of
integrally extruded microprism ribs which regulate the
transmittance of solar energy according to the angle of
incidence of solar light.
The
shading coefficient increases with the angle of solar incidence
so that the RFX panels switch from a transmissive to a
reflective mode. Maximum reflection occurs at an incidence angle
normal to the panel surface; maximum transmission occurs at
incidence angles in excess of 20°
from normal.
By planning the orientation of RFX
panels, solar heat gain can be controlled for maximum
energy-conserving effect on heating and cooling costs. RFX is
most effective when installed as skylights or for East, West or
South facing walls.
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 Seasonal
Solar Control
When
panels are oriented so that the extruded microprism ribs are in
an East-West direction, solar heat gain varies with the seasonal
solar attitude.
Much of the energy of the high summer sun is reflected, reducing
solar gain and air conditioning load, while admitting diffused,
atmospheric light to preserve pleasing daylighting effects.
Conversely, energy transmission from the low winter sun is
increased. allowing solar warmth to supplement the building's
heating system.
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