SOLARSHIELD® Tinted Glass Product Configuration Outboard Lite | Inboard Lite Transmittance % Reflectance % Winter U-Value Shading Coefficient SHGC (100% Air) LSG DW Index Visible Solar UV Out In Solar Air Argon Solarshield Pure Grey 45 44 25 5 5 5 1.02 0.93 0.69 0.59 0.76 0.41 A window covering that reduces heat by 75% has a shading coefficient of 0.25. PART 3 - EXECUTION . Though low glass-only SHGC is good, it's better to have a … However, many architects, builders, and inhabitants simply don’t want anything—dots, lines, patterns, decals, or frosting—obstructing their clear view. RHG is The amount of heat gain through a glass product taking into consideration the effects of solar heat gain (shading coefficient) and conductive heat gain (U-value). In a cool climate, windows which have a high SHGC allow a greater amount of solar radiation to pass through, offering free solar heating for the home. The Shading Coefficient (SC) is a measure of the heat gain through glass from solar radiation. Shading coefficient is a standard term in the glass industry used to rate the effectiveness of a glazing system compared to a "standard window". 10 SHGC (Solar Heat Gain Coefficient) - the proportion of total solar radiation that is transferred through the glass at … The inverse (1 ÷ U-value) of the U-value yields the R-value (ft 2 hr o F/Btu). 3. Shading coefficient (SC) is a measure of thermal performance of a glass unit (panel or window) in a building. Shading is a method to control the solar heat gain coefficient (SHGC) and visible light transmission (VLT) of a vertical fenestration. CLTD for glass depends mainly on the difference between indoor and outdoor temperatures but as with walls and roofs it is affected by the mass and properties of the glass material. This can be thought of as an addition to element U-value. Shading coefficient (SC) is a measure of thermal performance of a glass unit (panel or window) in a building. RHG is The amount of heat gain through a glass product taking into consideration the effects of solar heat gain (shading coefficient) and conductive heat gain (U-value). Tinted glass, sometimes called absorbing glass, has energy-absorbing materials within it, lowering the shading coefficient and giving a tint-generally bronze, gray, blue, or green. Shading Coefficient The ratio of solar heat gain through a specific type of glass that is relative to the solar heat gain through a 1/8” (3 mm) ply of clear glass under identical conditions. If using this worksheet, a standard bug screen must be assumed for all vertical fenestration unless replaced by another exterior shading device as listed in A6 (and Table S-1 below); only one exterior shading device may be applied to a … Shading Coefficient The ratio of solar heat gain through the glass relative to that through 3 mm clear glass. The lower the window shading coefficient, the less solar heat it transmits and the greater shading ability it has. Fixed shading with sheeting. Solar heat gain coefficient (SHGC) The SHGC of a glass is defined as the fraction of solar heat falling onto the glass that enters a room. Contributing to this is the lou-vering effect of glass block’s horizontal mortar joints, which helps reduce light transmission from the higher summer sun. Specifically, the Shading Coefficient is the ratio between the solar heat gain for a particular type of glass and that of double-strength clear glass. The ↓LOWER the relative heat gain, the more the glass product restricts heat gain. Shading Coefficient is an indicator of how well the glass is thermally shading the interior where … It is 86% of the Shading Coefficient. 3 Visible light transmission indicated the percentage of the visible spectrum that passes through the glazing. Center of Glass Properties. It is referred to as an indicator of the “Shading” performance of the glass design with respect to that of a 3mm glazing. - Glass composition: 3mm Float + 0,76 interlayer + 3mm Float - Shading coefficient, is a value that determines one type of thermal performance of a glass unit. While the solar heat gain coefficient and the shading coefficient address the same concept, they are significantly different. Solar optical properties: NFRC 300. South-facing glass is relatively easy to shade with an overhang during the summer to minimize solar heat gain. The value is expressed in Btu/hr/ft2 (W/m2). Solar heat gain coefficient (SHGC) is the fraction of solar radiation admitted through a window, door, or skylight -- either transmitted directly and/or absorbed, and subsequently released as heat inside a home. Shading Coefficient for each device, which is input to the DOE-2 building description. We propose two new indicators, the adjusted Solar Heat Gain Coefficient (aSHGC) which accounts for external shading while calculating the SHGC of a window, and a weighted SHGC (SHGC w) which provides a seasonal The lower the number the better the insulation or thermal control. The nationally recognized rating method by the National Fenestration Rating Council (NFRC) is for the whole window, including the effects of the frame. The value is calculated by dividing the Total Energy Transmittance by 0.87 and is specified using a value ranging from 1.00 to 0.00. The shading coefficient (SC) is derived by comparing the solar radiant heat transmission properties of any glass with a clear float glass having a total solar heat transmittance of 0.87 (i.e. If you divide by 0.87 (the coefficient for 1/8-inch clear glass), you get the shading coefficient you need to calculate solar heat gain. A lower Shading Coefficient … Examine substrate(s) for compliance. The superior insulating capability of Cardinal LoĒ² glass is a key factor in the construction of comfortable windows for cold climates. SHGC is short for solar heat gain coefficient, a number that represents the amount of solar radiation through a window. A variety of shading devices and high-performance windows have already been developed and applied to a large number of buildings to reduce a cooling load. For instance, green-tinted glass will allow 77 percent visible light transmission, while gray glass only allows 45 percent, yet the gray glass only improves SHGC by 2 percentage points. Manufacturers can provide the shading coefficient of their product range. Shading coefficient The measure of the total amount of heat passing through the glazing (known as the total solar heat transmittance) compared with that through a single clear glass. Outdoor Lite: “Azuria” Glass by PPG Industries, Inc., Sputter Coated on second surface (2) Indoor Lite: Clear Float Glass Low-E Coating: “Solarban” 60 Solar Control (Sputtered) by PPG Industries, Inc. It's measured between 0 and 1; a lower number means less solar heat transfer. I have some problems to implement in Trnsys Type 56 with Prebid/Trnbuild an internal shading device with known data of transmission, reflection and absorption coefficients. SOLAR HEAT GAIN COEFFICIENT (SHGC) - The fraction of solar radiation transmitted through polycarbonate expressed as a percentage. Essentially, it is the ratio of solar gain (due to direct sunlight) passing through a glass unit to the solar energy which passes through 3mm Clear Float Glass. A value of 1 means no shading and a value of 0 perfect shading. SHGC, shading coefficient, and U-value are the 3 important glass thermal properties influencing building envelope energy efficiency. The light green color of Solexia™ glass subdues interior brightness while still providing the highest visible light transmittance (69% for a one inch insulating unit) of any tinted glass available. Winhop Projects (HK) Limited is a pioneer on energy conservation scheme. Current prescriptive building codes have limited ways to account for the effect of solar shading, such as overhangs and awnings, on window solar heat gains. The Total Shading Coefficient (TSC) is derived by comparing the properties of any glass with a clear float glass having a total energy transmittance of 0,87 (such a glass would have a thickness of about 3 mm). The manufacturing process and type of materials with which the glass is coated ensure that this coating offers excellent durability and Shading Coefficient (SC) and Solar Heat Gain Coefficient (SHGC) and Solar Screen Shade Performance ... SC was (is) a simple description of how much heat makes it into a room through a certain type of glass. CLTD = Cooling Load Temperature Difference. It can be approximately calculated by: %ST + (0.27 x %SA) = %STt; SC = (1.15 x STt)/100 As the shading coefficient number decreases, heat gain is reduced, which means a better (3,0 mm) thick clear glass under the same design conditions. The shading coefficient was calculated for a single sheet of clear glass with reflective coating. The nationally recognized rating method by the National Fenestration Rating Council (NFRC) is for the whole window, including the effects of the frame. Lower shading coefficient What does SHADING COEFFICIENT mean? Specifically, the shading coefficient is the ratio between the solar heat gain for a particular type of glass and that of double-strength clear glass. In the
implementation this is handled via a coefficient expressing this component of heat loss as a multiple of element area. What does shading coefficient mean? The short wave shading coefficient is the direct transmittance (T) of the glass as a factor of the solar factor or total transmittance (g or TT) of 3mm clear float glass (T ¸ 0.87). Conductivity for glass, like other building materials, is expressed as a U- value (Btu/hr ft 2 o F). With its bold, almost‑black look, Graylite ® II glass is the solution for applications requiring reduced solar heat gain and a specific aesthetic objective. Reflective Glazings Reflective glazings have better shading coefficients than tinted glazings because they reflect rather than absorb most of the infrared heat. 1.5: SUBMITTALS ... Center of glass solar heat gain coefficient: NFRC 200 methodology using LBNL-35298 WINDOW 7 computer program. While the solar heat gain coefficient and the shading coefficient address the same concept, they are significantly different. Fixed exterior shading devices such as overhangs are generally most practical for small commercial buildings. Reference glass for determining solar heat gain coefficients is 1/8 inch double strength (DSS) glass.
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