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Electrchromic glass (Smart glass)


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It's about the 3 main technologies of electrochromic smart glasses.

Published in: Science
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Electrchromic glass (Smart glass)

  1. 1. Electrochromic smart materials “Smart Windows”
  2. 2. What are Smart Windows? Smart Windows are windows which use a glazing material to control the amount of light that is allowed to pass through the glass panes. The glazing material is often called “switchable glazing”. These materials change their optical behaviour with application of electrical voltage.
  3. 3. Various Terms for Smart Glass
  4. 4. Types of Smart Glasses
  5. 5. Active Smart Glass Electrochromic Suspended particle device (SPD) Polymer dispersed liquid crystal (PDLC)
  6. 6. Glass-ITO/LixWO3/PEO-LiN(SO2CF3)2/Liy(TiO2 – CeO2)/ITO/glass Glass/ITO/polytoluidine/cellulose – polyacetate polymer/ Hy(TiO2 – CeO2/ITO/glass  Ability to tune optical transmission from clear to dark.  Low switching speed.  Lack complete opacity.  Requires electricity only to change opacity, not to maintain
  7. 7. SPD – Suspended Particle Devices Microscopic light-absorbing particles are dispersed in droplets within a film. In the "off" state the particles are suspended randomly, making the window dark. At moderate voltage is applied the particles align and permit light to pass through.
  8. 8. SPD Transmittance Angle prespective Voltage perspective
  9. 9. PDLC – Polymer dispersed Liquid crystal Beats:1. Switching speed. Opacity of dark state. Most expensive option. Switches to milky white in less then a secund
  10. 10. Material When is transparen t Continuous states between opaque and transparent Requires power to maintain the state Pros Cons Electrochromic Switched OFF YES NO Widely used (cheap), no „E” for maintainig the translucent state Long transition time, new glass must be installed SPD ON YES YES Fast, Clear to tinted Bad at blocking IR (poor performance) PDLC ON NO YES External, Internal use, good efficiency entire spectrum expensive Conclusion
  11. 11. References: 1. C.G. Granqvis, Journal of the European Ceramic Society 25 (2005) 2907–2912 2. David Barrios, Ricardo Vergaz, Jose M. Sanchez-Pena, Claes G. Granqvist, Gunnar A. Niklasson Solar Energy Materials & Solar Cells 111 (2013) 115-122 3. Anna Llorde ´s1, Guillermo Garcia1, Jaume Gazquez2 & Delia J. Milliron Nature vol. 500 (2013) 323-327 4. Baetens, R.; Jelle, B.P.; Gustavsen, A. Solar Energy Materials and Solar Cells 94 (2) (2010): 87–105. 5. Lee, E.S.; Tavil, A. Building and Environment 42 (6) (2007). : 2439–2449 6. Wiki…. Google…