solar heat gain control

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solar heat gain control

One of the primary advantages of Kalwall over other types of glazing is its ability to control heat transfer without the need for special tints or coatings like vision glazing. This is accomplished by controlling both the transfer due to solar gain and due to conduction. The total heat gain that enters a building from the sun is known as solar heat gain. The measure of solar heat gain is called the Solar Heat gain Coefficient (SHGC) and is expressed as a decimal between 0 and 1. The lower the SHGC, the less solar gain is admitted into a building. Kalwall can provide a range of SHGCs suitable for a particular application and climate. In the example shown below a typical Kalwall panel (Crystal-White | 0.23 U-factor) is compared to a 1” clear insulated glass unit (IGU) to illustrate Kalwall’s inherent ability to manage solar heat gain while providing museum-quality daylighting along with superior thermal performance.

 


 

Solar Control Properties: Insulated Glass (IGU) vs Kalwall

Solar Control Properties

 

 

Performance Data: 2-3/4” (70mm) Panel

FRP Face Sheet Combinations Visible Light Transmission (VLT) % by NFRC 202 Solar Heat Gain Coefficient @ 0° by NFRC 201
Exterior FRP Interior FRP 0.53 U 0.29 | 0.23 U 0.22 | 0.14 U 0.18 | 0.10 U 0.05 U 0.53 U 0.29 | 0.23 U 0.22 | 0.14 U 0.18 | 0.10 U 0.05 U
Crystal White 37% 26% 13% 7% 20% 0.33 0.31 0.18 0.14 0.27
White White 23% 16% 9% 4% 14% 0.26 0.25 0.16 0.11 0.20
Crystal Crystal 58% 35% 14% 9% N/A 0.55 0.36 0.20 0.14 N/A

 

Performance Data: 2-3/4” (70mm) Panel

FRP Face Sheet Combinations Visible Light Transmission (VLT) % by ASTM E-972 Solar Heat Gain Coefficient @ 0° *
Exterior FRP Interior FRP 0.53 U 0.29 | 0.23 U 0.22 | 0.14 U 0.18 | 0.10 U 0.05 U 0.53 U 0.29 | 0.23 U 0.22 | 0.14 U 0.18 | 0.10 U 0.05 U
Aqua White 29% 17% 6% 4% 15% 0.45 0.24 0.14 0.10 0.21
Rose White 30% 18% 6% 4% 16% 0.46 0.24 0.15 0.10 0.21
Ice Blue White 35% 20% 8% 6% 21% 0.54 0.28 0.17 0.12 0.26
Greenish Blue White 25% 14% 5% 3% 14% 0.50 0.23 0.14 0.10 0.19

 

Performance Data: 4” (100mm) Panel

FRP Face Sheet Combinations Visible Light Transmission (VLT) % by NFRC 202 Solar Heat Gain Coefficient @ 0° by NFRC 201
Exterior FRP Interior FRP 0.55 U 0.15 U 0.08 U 0.05 U 0.55 U 0.15 U 0.08 U 0.05 U
Crystal White 37% 13% 5% N/A 0.52 0.09 0.04 N/A
White White 23% 11% 4%+ N/A 0.38 0.06 0.04* N/A
Crystal Crystal 58% 17% 6% N/A 0.65 0.11 0.07 N/A

 

Air Gap Only Fiberglass ‘Batts’ Lumira® Aerogel

U-value SI conversion: 1.0 W/m²K = 0.176 Btu/hr/ft²/°F

U-values shown in bold denote thermally-broken grid core panels.
Visible light transmission (VLT) – NFRC 202, ASTM E-972 (approximate) as noted. VLT percentages over 30% are not recommended for most Kalwall applications.
Panel U-values include panel grid-core by NFRC 100 or 102. NFRC certified system U-values vary depending on framing. Project-specific Information available by request.
Shading Coefficient (SC) is equal to 1.15 times the Solar Heat Gain Coefficient (SHGC). *By calculation only (not by NFRC 201). By calculation only (not by NFRC 202)