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Technical Studies - Sun Control

Exeter Architectural Products contracted a nationally recognized, independent testing laboratory to evaluate the Shading Coefficient and determine the effect on solar heat gain that resulted from the installation of window barriers with perforated metal membranes (infill) as used in Security Shield™ and Versa Shield™ security products. Please note that the tested barrier membranes were perforated with the trademark Invisi Perf II pattern and protected with our standard high-performance powder coat finish.

The testing process determined the Shading Coefficient to be 0.51. This means that customers are afforded an almost 50% reduction in solar heat gain through the protected openings.

Reducing the solar heat gain is a practical method for saving energy. For example, just sixty square feet of glass can admit as much as 12,000 BTU of heat during each hour, requiring one extra ton of air conditioning. By installing a Security Shield™ or Versa Shield window barrier over the existing glass, the amount of solar heat being introduced through the window opening is reduced by almost 50%.

The following chart represents the solar heat gain for 1/8" clear glass (ASHRAE reference glazing) and 1/8" clear glass protected by a Security Shield™ Window Barrier.   Conditions were simulated for July 21 st in Miami, Florida for east, west, and south facing openings.

Clear Sky Solar Heat Gain - Miami, Florida

Time
of Day

East Surface
BTU/hr.ft2

South Surface
BTU/hr.ft2
West Surface
BTU/hr.ft2
AST 1/8"
Clear
with
SECURITY
SHIELD
1/8"
Clear
with
SECURITY
SHIELD

1/8"
Clear
with
SECURITY
SHIELD

7 AM
8 AM
9 AM
10 AM
11 AM
NOON
1 PM
2 PM
3 PM
4 PM
5 PM
6 PM

193
215
195
149
83
43
39
36
32
26
18
7

98
109
100
76
42
22
20
18
16
13
9
3

18
27
34
40
47
50
47
40
34
27
18
7

9
14
17
21
24
26
24
21
17
14
9
3

18
26
32
36
39
43
83
149
195
215
193
91


9
13
16
18
20
22
42
76
100
109
98
46

• East Facing - 8 A.M.,Miami, Florida
• Time is given in Apparent Solar Time
• 1/8" Clear = 1/8" clear ASHRAE reference glazing
• W/Security Shield™ is 1/8" clear glass with Security Shield™ barrier on the outside
• Testing and Data supplied by Tait Solar Co., Inc., Tempe, Arizona


Clear Sky Solar Heat Gain - Miami, Florida Chart

Clear Sky Solar Heat Gain Reduction
July 21st, East Facing Vertical Surface

Clear Sky Solar Heat Gain Reduction
July 21st, West Facing Vertical Surface

Clear Sky Solar Heat Gain Reduction
July 21st, South Facing Vertical Surface

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800-213-2575

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