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Introduction to the radiancy and the colour 2008

Introduction to the radiancy and the colour 2008. Technical Advisory Service. Introduction to the radiancy and the colour. The radiancy The solar spectrum The light Light transmission and reflexion Energetic transmission and reflexion Protection of the glass against radiancy The colour

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Introduction to the radiancy and the colour 2008

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  1. Introduction to the radiancy and the colour 2008 Technical Advisory Service

  2. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  3. The radiancy Solar radiancy Radiators Close IR Radio waves Visible Long IR

  4. The radiancy Solar spectrum

  5. The radiancy

  6. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  7. The solar spectrum Energy UV Light Short infra red Intensity(W/m²) 1.5 1.0 0.5 0 2500 280 380 780 0 Wavelength (nm)

  8. The solar spectrum UV : 280 to 380 nm 5% energy Light : 380 to 780 nm 50% energy Short I.R. : 78O to 2500 nm 45% energy

  9. The solar spectrum Solar constant : 1353 W/m² reflective absorbed dispersed direct

  10. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  11. The solar spectrum 1.5 Light Intensity(W/m²) 1.0 0.5 0 2500 280 380 780 0 Wavelength (nm)

  12. The ligth

  13. The ligth l(nm) 380 400 500 600 700 800

  14. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  15. Light transmission and reflexion (380–780 nm) LR rv LT tv tv = LT = transmitted light incident light Light

  16. Light transmission and reflexion (380–780 nm) the light transmission depends on : • the transmission’s curve of the product • the reference illuminant • the eye sensibilty

  17. Light transmission and reflexion (380–780 nm) Transmission curve of the product Single glazing 6 mm 90 80 CLAIR 70 BRONZE GRIS 60 Transmission (%) 50 AZUR VERT 40 30 PRIVA BLUE 20 10 0 280 380 780 1000 2000 2480 Longueur d’onde (nm)

  18. Light transmission and reflexion (380–780 nm) Reference illuminant

  19. Light transmission and reflexion (380–780 nm) Reference lighting up : • A: filament light bulb (automotive) • C65: natural light • D65: natural light (EN 410)

  20. Light transmission and reflexion (380–780 nm) Eye sensitivity

  21. Light transmission and reflexion (380–780 nm) Light transmission With t(l) = transmission curve of the productS(l) = eye sensitivityE(l) = reference illuminant

  22. Light transmission and reflexion (380–780 nm) Light reflexion With r(l) = transmission curve of the productS(l) = eye sensitivity E(l) = reference lighting up

  23. Light transmission and reflexion (380–780 nm) Index of reproduction of colours RD65 This index gives a quantitative evaluation of the difference in colorbetween 8 samples of color-test lit directly by illuminating D65, and the light coming from same illuminating, transmitted by theglazing

  24. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  25. Energetic transmission and reflexion (300–2500 nm) DET te ER re AEae qe qi SF = g = transmitted heat incident heat Heat }SF

  26. Energetic transmission and reflexion (300–2500 nm) Energetic equation : DET + EA + ER = 100 % re= ER = energetic reflexion te= DET = direct energetic transmission ae= EA = energetic absorption SF = g = solar factor = total energetic transmission

  27. Energetic transmission and reflexion (300–2500 nm) 100 Clear glazing Transmission (%) 50 Stopray Safir 0 280 380 780 1000 2000 2500 Wavelength(nm)

  28. Energetic transmission and reflexion (300–2500 nm) Direct energetic transmission With t(l) = transmission curve of the productE(l) = solar spectrum of reference

  29. Energetic transmission and reflexion (300–2500 nm) Solar factor (monolithic glazing) For clear glazing, we have hi = 8 W/(m²K) and he = 23 W/(m²K)

  30. Energetic transmission and reflexion (300–2500 nm) he = coefficient of surface heat exchange between the wall and the external environment absorption hi = coefficient of surface heat exchange between the wall and the interior environment

  31. Transmission et réflexion énergétique (300–2500 nm)

  32. Energetic transmission and reflexion (300–2500 nm) Remarks : indexes of the USA standards • SHGC (solar heat gain coefficient) = SFS • SC (shading coefficient) = sS/87 • SC sw = DET/87 • SC lw = SC – SC sw • Relative Heat Gain: RHG (W/m²) = 630 SC + 7,8 U

  33. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  34. Protection of the glass against radiancy Protection against X rays • Glass with high lead content

  35. Protection of the glass against radiancy Protection against the UV • Laminated glass • TrUV, SPF, Krochman KDF • The less the UV transmission, the less UV penetrate int he building • Caution: no UV transmission is not synonymous with absence ofdiscolouration (blanching)

  36. Protection of the glass against radiancy Protection against the light and lighting of the buildings • Coloured glazings, coated glass • TL • The highest the LT, the more light comes into the building. The lighting level of the buildings depends on the LT  See training «Glass and solar control»

  37. Protection of the glass against radiancy Protection against vision • Opaque, mat, painted, printed glazings …

  38. Protection of the glass against radiancy Protection against short IR and the heat • Ccoloured glass, coated glass • SF, (TrIR) • The lowest the SF, the lowest heat comes into the building. The system of air conditioning of a building depends on the level of SF  See training «Glass and solar control»

  39. Protection of the glass against radiancy Protection against long IR • Low emissivity glass (Top N, Top NT, Stopray, Planibel G, Sunergy) • Emissivity e, Ug • The heating system depends on the level of insulation of the building  See training «Glass and thermal insulation»

  40. Protection of the glass against radiancy Protection against radio waves • Electrified coated glass

  41. Protection of the glass against radiancy

  42. Introduction to the radiancy and the colour • The radiancy • The solar spectrum • The light • Light transmission and reflexion • Energetic transmission and reflexion • Protection of the glass against radiancy • The colour • Conclusion

  43. The colour

  44. The colour

  45. The colour

  46. The colour The colour of an object depends on : • the illuminant which lights the object • the object itself which modifies by transmission or reflexion the received light • the eye of the observer and the transfer of the image towards the brain

  47. The colour

  48. The colour To quantify a colour, it is thus necessary to know : • the spectrum of energy emitted by the source of light • the spectrum of transmission or reflexion of the object • the response of the human eye

  49. The colour Guild & Wright experiment

  50. The colour

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