EFFICIENT I.G.U

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TECHNICAL DATA - GLASS

At Efficient IGU we aim to provide the type of unit that is best suited to your requirements to this end we provide you with a comparison chart for your information to down load.

Below is an explanation of the performance data

Tech data - Insulated glass units.pdf

Knowledge

High performance tones
Single glazing
IGU
IGU + Low E
Product
Daylight
Solar
Insulation
Daylight
Solar
Insulation
Daylight
Solar
Insulation
Viridian
SuperGreen
66
0.51
5.8
58
0.39
2.7
54
0.34
1.9
Viridian
SuperGrey
9
0.35
5.7
8
0.21
2.7
7
0.15
1.9

Viridian SuperGreen™ has the highest light transmission & Virdian SuperGrey™ has the lowest of the high performance tones

Viridian SuperGrey™ has the highest solar performance.  Its SHGC of only 0.35 eliminates the most solar heat

With all the high performance tones Low E™ has the best insulation.  Note the solar control is also increased with very little loss of day light

EXPLANATION OF PERFORMANCE DATA

The following chart is an extract from the performance data table.  The information is for the standard stock items in Efficient IGU range. Not all manufactured or custom options have been included

Note: Data is based on laboratory spectrophotometric measurements and reduced using Windows software for NFRC 100-2001 conditions, which is the internationally recognised method for describing glass performance.  The data is glass only and care should be exercised when evaluating manufacturer’s published data when the same environmental conditions have been used.

  1. Product name - refer to product for more information where (#2) appears, this identifies the glass coated surface that is glazed to the inside of a building or the inside of a Double Glazed unit.
  2. Nominal thickness - the glass thickness or the make-up of a Double Glazed Unit.  The first number is the outer glass thickness +12mm gap (spacer), then the thickness of the inner panel of the unit.  Thickness tolerances are:

3 -6mm (+0.2mm)     8-12mm (+0.33mm)     15mm (+0.5mm)     19mm (+1.0mm)

  1. Visible light transmission - percentage of visible light passing directly through the glass.   The wave length range of visible light is 380 to 780nm. The higher the percentage the more daylight.
  2. Visible light reflection - percentage of visible light reflected toward the exterior
  3. Solar transmission - percentage of normally incident visible light and solar energy passing directly through the glazing.  The wave lengths measured for solar energy is 300 to 2500nm.
  4. Solar reflection - percentage of normally incident visible light and solar energy reflected toward the exterior
  5. UV transmission - the percentage of UV light transmitted measured in the light range of 300-380nm.  The lower the number the better.
  6. U Value - measurement unit is watts per mper degree celcius (W/m°C) and is a measure of the rate of heat gain or loss through glazing due to environmental differences between outdoor and indoor air.
  7. Shading coefficient - the ratio of solar heat gain through the glass relative to that through 3mm clear glass.   The lower the number the better the performance.
  8. SHGC (Solar Heat Gain Coefficient) - the proportion of total solar radiation that is transferred through the glass at normal incidence.  It comprises the direct solar transmission (5) and the the part of the solar absorption dissipated inwards by radiation and convection.   The lower the number the better the solar performance
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