Palram PALSU - Manual (Page 10)

10
Service Temperature
The temperature range over which the characteristics of PALSUN are retained extends from -50°C to +120°C (-60°F to +250°F) for
short periods and from -50°C to +100°C (-60°F to +210°F) for long periods. This range of temperatures make PALSUN sheets suitable
for use in most climates.
Thermal Insulation
On very hot days, the surface temperature of the sheet might reach up to 60°C (140°F). The U-value characterizes the degree of
thermal transmittance offered by a given glazing material, so higher U-values are associated with materials that are poor insulators
and result in a greater loss of heat. The following table compares
the U-values of glass and PALSUN sheets of equivalent thicknesses.
Thicker sheets of a given material will offer greater thermal insulation
and be characterized by a lower U-value and reduced heat loss. For
any given thickness, the U-value of PALSUN sheet is lower than that
of glass. This means that heat loss from the building interior, as well
as penetration of heat or cold into a building, will be less if it were
glazed with PALSUN than for one glazed with glass. This can result in
a significant reduction in energy costs both for heating in winter and
air-conditioning during the summer. Note that use of Solar Control
sheets will insulate just as well, but will also reduce air-conditioning
costs because of Near Infra-Red reflection and reduced heat buildup.
Thermal Characteristics
Thermal Expansion
The thermal expansion of PALSUN sheets is higher than that of
glass. This important factor must be taken into account when
mounting the sheets. The graph on the right shows the degree
of expansion/contraction as a function of temperature.
Expansion/Contraction with Temperature
60
40
20
0
-20
-2 -1 0 1 2
Dimensional Change (mm/m)
Temperatur
e (°C
)
Thermal Insulation of PALSUN® vs. Glass
Thickness
mm in
PALSUN U-Value
(W/m2·°K)
Glass U-Value
(W/m2·°K)
3 (0.12) 5.47 5.81
5 (0.20) 5.19 5.72
6 (0.24) 5.07 5.68
8 (0.31) 4.48 5.60
10 (0.39) 4.63 5.52
12 (0.47) 4.43 5.45
Heat-Blocking with High Clarity by PALSUN® Breeze
PALSUN glazing with Breeze tint transmits plenty of incident daylight (70%), while absorbing/blocking a large portion of the Infrared
radiation, thus significantly reducing heat buildup within the structure. PALSUN Breeze also provides a clear view due to its high
transparency, which is uncommon for heat-blocking products.
Wavelength (nm)
250
100
90
80
70
60
50
40
30
20
10
0
UV LIGHT INFRA-RED
PALSUN® 3mm Breeze 70%LT
Solar Performance Graph (250-2,500nm)
500 750 1000 1250 1500 1750 2000 2250 2500
Wavelength (nm)
250
100
90
80
70
60
50
40
30
20
10
0
UV LIGHT INFRA-RED
PALSUN® 3mmTrans. Blue 68%LT
Solar Performance Graph (250-2,500nm)
500 750 1000 1250 1500 1750 2000 2250 2500
%S
olar
Tr
nasmittanc
e
/
Reflec
tanc
e
%S
olar
Tr
nasmission
/
Reflec
tion
Transmittance
Reflectance
Reflectance
Transmittance
Transmits plenty
of natural daylight
Transmits very little
Infrared heat