Palram PALGAR - Manual (Page 34)

PALSUN® PALGARD™
Glazing Guide
34
Figure 34.Curved Clear PALSUN Glazing
over a Parking Lot, Northern Europe
Figure 35. PALSUN Clad Moveable Skylight in Opal-White Curved
Glazing
c) Control of Light & Heat Transmission: Colorless transparent PALSUN (Clear) or
tinted transparent sheets of all variations are handsome and aesthetic, transmit a lot of
light and it is possible to enjoy the scenery and clouds in the sky by day and the moon
and stars by night. lovely.
However, these nice properties create a problem,
especially in warm and hot climates, for along with
the lot of visible light ample amount of heat finds its
way through the glazing to the building interior.
This bothersome heat enters the building mostly as
direct radiation and even strong air-conditioning
could not get rid of the inconvenience and possible
damage to inhabitants and hardware.
This surplus heat puts a heavy load on the building
air-conditioning system, if exists, especially around
the transparent area, increasing energy
requirements and maintenance cost substantially.
We Recommend:
• In warm to hot climates, or in those climates where summers could be hot, when the architect is
adamant on using transparent glazing, then reducing glazing size to a possible minimum, to diminish
heat buildup and amount of direct heat radiation, is a preferred option.
• Designing the overhead skylights and other glazed openings so most of them would be shaded all or
most of the day by other parts of the building, or locating them so they would be Northern oriented
as far as possible.
• When the design approach is a practical and reasonable approach, aluminum gray “Solar Control” or
the pearly white “Solar Ice” PALSUN glazing should be selected, as they transmit only 20 to 35% of
the visible light with even less percentage of direct heat radiation, while still offering a small amount
of optical transparency.
These metallic hues are both aesthetic and “Hi-Tech” in appearance, providing a reasonable amount of
light-transmission while transmitting significantly lower percentage of heat.
Another option: Opal-White glazing,
transmitting no direct radiation, reflecting back
most of the IR heat radiation.
There is not any optical transparency, but it
provides controlled transmission of indirect
“white light”, combining the full range of the
rainbow colors.