PALSUN Technical Guide

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PALSUNTechnical ManualSolar Irradiance energy Gain: For transparent materials, solar energy transmission is an extremely importantconsideration. geographical location and typical thermal/optical properties of the specific glazing are the mainfactors influencing solar heat gain.Figure 4: Solar Radiation Schematic Behavior Through Light Transmitting Material100% SolarEnergy Radiation% ReflectedRadiationGlazing% Direct Solar EnergyPenetration throughTransmission.% Solar Energy (Heat)Outward Emission.% Solar Energy InwardEmission as Heat% Solar EnergyAbsorptionColors and tints reduce the percentage of visible light transmitted through the sheets, but solar energy is stillabsorbed by the glazing itself, and in turn transferred by convection and far IR radiation from the heated glazinginto the building. (See Table 6, next page)DefinitionsVisible Light Radiation - The portion of the light spectrum whose wavelength ranges from 400 nm to 700 nm.% Light Transmission (%LT) - Percentage of incident visible light that passes through an object .% Light Reflection (%LR) - Percentage of incident visible light that strikes an object and returns in the form ofvisible light.% Light Absorption (%LA) - Percentage of incident visible light that strikes an object and is absorbed by it.%LT + %LR + %LA = 100%Solar Radiation - The solar spectrum ranging from 300 nm to 2400 nm. Included are UV, visible and NIR radiation.% Direct Solar Transmission (%ST) - Percentage of incident solar radiation that passes directly through an object.% Solar Reflection (%SR) - Percentage of incident solar radiation that strikes an object and is reflected.% Solar Absorption (%SA) - Percentage of incident solar radiation that strikes an object and is absorbed by it.%ST + %SR + %SA = 100%Total Solar Transmission (%ST t ) - The percent of incident solar radiation transmitted by an object which includesthe direct solar transmission plus the part of the solar absorption reradiated inward.Total Solar Reflection (%SR t ) - The percent of incident solar radiation rejected by an object, which includesthe solar reflectance plus the part of the solar absorption, reradiated outward.%ST t + %SR t = 100%Shading Coefficient (SC) - The ratio of the total solar radiation transmitted by a given material to that transmittedby normal glass, whose light transmission is 87%. It can be approximately calculated by:SC = 1.15 x ( %ST + 0.27 x %SA ) / 100%ST + 0.27 x %SA = %ST tSC = 1.15 x ST t /1008
PALSUNTechnical ManualTable 6: PALSUN - Solar Light and Radiation Transmission Properties% LT %LR %ST %SRProductThickness%SRtASTM ASTM ASTM ASTM ASTMmm (in.)D-1003 E424-71 E424-71 E424-71 E424-71ClearBronze 50%Bronze 35%Bronze 20%Solar Grey 50%Solar Grey 35%Solar Grey 20%Solar Metallic* 50%Solar Metallic* 35%Solar Metallic* 20%Standard White OpalStandard White OpalStandard White OpalStandard White OpalStandard White OpalStandard White OpalStandard White OpalStandard White Opal3 (0.12)AllAllAllAllAllAllAllAllAll0.8 (0.039)1 (0.04)1.5 (0.08)2 (0.08)3 (0.12)4 (0.16)5 (0.20)6 (0.24)885035205035205035204535453928191411107667662417295155505458596061845442285442274835184640402923181310107667662417284347414548505253143544543544554452675157556470737780SCASTME424-711.000.750.640.520.750.640.510.640.540.360.560.500.520.410.350.310.260.23*Solar ControlPhysical treatments of one surface (embossing, matte) or the addition of a diffuser additive diminish glare anddazzle, preventing damage by direct irradiance. However solar energy is still transmitted through and increasesthe solar heat gain inside.PALSUN Solar Control: PALSUN glazing with integrated Solar Control (no laminated layer to peel off!) and alight transmission of 20, 35, or 50%, reflects a large portion of far IR radiation (heat).% Light Transmission, Reflection or AbsorptionFigure 5a: Optical Properties of Solar Control Sheet with20% Light Transmission10090807060504030201002505007501000Transmission125015001750Absorption2000Reflection22502500% Light Transmission, Reflection or Absorption1009080706050403020100250Figure 5b: Optical Properties of Solar Gray Sheet with20% Light Transmission500AbsorptionTransmission7501000Reflection125015001750200022502500Wavelength (nm)Wavelength (nm)9
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Page 10 and 11: PALSUNTechnical ManualE. Weather Re
Page 12 and 13: PALSUNTechnical ManualI. Adhesives
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Page 16 and 17: PALSUNTechnical Manual2. Band Saw:B
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Page 22 and 23: PALSUNTechnical ManualTable 16: Rec
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Page 26 and 27: PALSUNTechnical ManualB. Thermoform
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Page 44: Inasmuch as PALRAM Industries has n

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