Solar Radiation 230 BTU s per Hr/SF. Performance Glazing Coatings, Layers & Gases
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1 Solar Radiation 230 BTU s per Hr/SF Performance Glazing Coatings, Layers & Gases
2 Learning Objectives After Viewing This Presentation You Will Understand: q The NFRC Labeling System q Light Spectrum q Coating Performance q Application Technology q Engineering q U-Factor / SHGC / VT / VR q Building Design Application of Coatings
3 NFRC Label National Fenestration Rating Council
4 Solar Light Spectrum Heat Generation 3% 45% 52%
5 Glazing and the Solar Spectrum Windows reflect, absorb or transmit visible light, ultraviolet light, and heat.
6 Why Low E Coatings? Code Compliance Energy Savings Improved Comfort Reduced Fading Less Condensation Increased Light & View
7 Low E Effect On Winter Nights Btu per sq ft per hr 1 Btu per sq ft per hr 21 Btu s per sq ft per hr Inside radiant heat 21 Btu s per sq ft per hr 0 Clear IG Dual Low E Tri-pane Low E Btu s of interior radiant heat exiting the home: 21 Btu s 1 Btu 1 Btu Conduction heat exiting through materials: 13 Btu s 16 Btu s 10 Btu s Inside glass temp at 0 degrees F outside : 44 deg 56 deg 60 degrees Total Btu s exiting through the glazing 34 Btu s 17 Btu s 11 Btu s
8 Low E Effect On Summertime Sun Solar Radiation 230 BTU s per Hr/SF Btu s from solar radiation is reduced: 22% 73% 75% Conduction heat entering materials: 7 Btu s 3 Btu s 2 Btu s Convection heat transferred: 12 Btu s 6 Btu s 8 Btu s Inside glass temperature: 90 degrees 82 degrees 83 degrees
9 Improved Comfort
10 Greater Protection from UV
11 Greater Protection from Fading
12 Less Condensation
13 Increased Light and View
14 Energy-efficient glazing systems Defining Emissivity (E) Types of Low E Where Low E is Applied How it s Applied Engineering for Performance
15 Emissivity (E) Measure of a material s ability to emit long wave radiation (heat).
16 Types of Coatings Sputtered vs. Pyrolytic Low emissivity Low-Med-High SHG Silver based Vacuum deposition Uniform Neutral color Low Haze Must be insulated Medium emissivity High SHG Metal oxides Spray process Can be non-uniform Can have color Can have haze Single Glaze
17 Surface Designation Outdoor Pane Surface # 3 Surface # 4 Surface # 1 Surface # 2 Surface # 5 Surface # 6
18 Low E Coating Locations Surface #2 (Dual Pane) Better overall performance Reduces Solar Heat Gain Reduces Summer Inside Glass Temperature Reduces Winter Thermal Breakage Potential Surface #3 (Dual Pane) Passive Solar Increased Solar Heat Gain Increased Inside Glass Temperature Note: Winter Nighttime U-Value is the same for both surface #2 or surface #3
19 Low E Coating Locations Surface #4 (Dual Pane) Reflects Heat Lowers U Factor Reduces Solar Heat Gain Decreases Inside Glass Temperature (Increasing the Risk of Condensation) Rivals Tri-Pane Performance Tri-pane is typically assembled with the coatings on surfaces 2 and 5.
20 How Coatings are Applied
21 How Coatings are Applied
22 22
23 Typical Available Low E Coatings LoĒ Products Silver Layers Visible Light Transmission LoĒ LoĒ LoĒ LoĒ
24 Spectrally Selective Coatings Adjusting the various coatings will cause variations in the U-Value Solar Heat Gain (SHGC) Visible Light Transmittance (VLT) Visible Light Reflectance
25 U-factor / R-value U-factor: The measurement of heat loss or gain through a material or assembly. R-value: The resistance a material has to heat flow.
26 Center of Glass U-factor (Btu/hr/ft 2 / 0 F) Clear / Clear Clear / LoE-180 tm LoE -272 tm /Clear LoE -366 tm /Clear LoE -240 tm /Clear Triple-Pane LoE-180 tm /Clear / LoE-180 tm Triple-Pane LoE -366 tm /Clear / LoE -180 tm
27 Solar Heat Gain Coefficient (SHGC) Number between 0 and 1 The lower the SHGC the less solar heat is transmitted and the greater its shading ability
28 Solar Heat Gain Coefficient (SHGC) Indoor Glass0 SHGC Temp F Double-Pane Clear Double-Pane LoE-180 tm Double-Pane LoE-180 tm Gray Tint Double-Pane LoE-240 tm Double-Pane LoE -272 tm Double-Pane LoE -366 tm Triple-Pane LoE-180 tm Triple-Pane LoE -366 tm Krypton Gas Typically Decreases SHGC by -0.02
29 Visible Light Transmittance (VT) An optical property that indicates the amount of visible light transmitted. Number between 0 and 1
30 Visible Light Transmittance (VT) Clear / Clear Clear / LoE-180 tm LoE-180 tm Gray Tint 0.53 LoE -272 tm /Clear LoE -366 tm / Clear LoE -240 tm /Clear Triple-Pane LoE-180 tm /Clear / LoE-180 tm Triple-Pane LoE -366 tm /Clear / LoE -180 tm 0.51
31 Visible Light Reflectance (VR) Outdoor Visible Light Reflectance In the visible light spectrum, the percentage of light that is reflected from the glass surfaces relative to the C.I.E. Standard Observer. C.I.E. Standard Observer: Since Humans perceive color and appearance in different ways, subjectively, The C.I.E. Standard Observer attempts to standardize the human observer as a numerical representation of what the average person sees. Indoor Visible Light Reflectance The percentage of visible light that is reflected from the glass surfaces to the inside of the building.
32 Visible Light Reflectance (V) % OUT % IN Clear / Clear Clear / LoE-180 tm 15% 14% 15% 14% LoE-180 tm Gray Tint 9% 13% (Surface #3) LoE -272 tm / Clear LoE -366 tm /Clear 11% 11% 12% 12% LoE -240 tm /Clear Triple-Pane LoE-180 tm /Clear / LoE-180 tm Triple-Pane LoE -366 tm /Clear / LoE -180 tm 14% 10% 19% 19% 14% 17%
33 Solar Spectrum 2-pane
34 Solar Spectrum Tri-pane
35 Spectrally Selective Coatings
36 Resources Cardinal Glass
37 Questions?
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