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Smart glass

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. What are smart glass
.Types of smart glass
. Electrochromic devices (EC)
. suspended particle devices (SPD)
. Polymer dispersed liquid crystal devices (PDLC)
. The benefits of smart glass
.Application

Published in: Technology
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Smart glass

  1. 1. .What are smart glass .Types of smart glass . Electrochromic devices (EC) . suspended particle devices (SPD) . Polymer dispersed liquid crystal devices (PDLC) .The benefits of smart glass .Application
  2. 2. Mohammed Nasr ElDin IbrahimAbd Elhamid
  3. 3. 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.
  4. 4.  Electrochromic windows centred around special materials that have electrochromic properties .  ‘Electrochromic’ describes materials that can change color when energized by an electrical current.  Electrochromic windows darken when voltage is added and are transparent when voltage is taken away.
  5. 5.  The basic working principle involves lithium ions (positively charged lithium atoms—with missing electrons) that migrate back and forth between the two electrodes through the separator.  When the glass is clear, the lithium ions reside in the innermost electrode.  When a small voltage is applied to the electrodes, the ions migrate through the separator to the outermost electrode , where they scatter away most of the incoming light and turn the glass opaque.
  6. 6.  They remain there all by themselves until the voltage is reversed, causing them to move back so the glass turns transparent once again.
  7. 7.  SPD window consists of several layers:  Two panels of glass or plastic.  Conductive material - used to coat the panes of glass.  Suspended particle devices - millions of these black particles are placed between the two panes of glass.  Liquid suspension or film - allows the particles to float freely between the glass.  Control device - automatic or manual.
  8. 8.  In suspended particle devices (SPD), a thin film laminate of rod-like particles suspended in a fluid is placed between two glass or plastic layers, or attached to one layer.  When the power supply is switched on, the rod shaped suspended particle molecules align, light passes through and the SPD Smart Glass panel clears.
  9. 9.  When the power supply is switched off the rod shaped suspended particle molecules are randomly oriented blocking light and the glass panel looks dark (opaque).  The SPD Smart Glass when becomes dark can blocking up to 99.4% of light. SPD Smart Glass protect from damaging UV when on or off.
  10. 10.  Polymer dispersed liquid crystal is simply micro droplets of liquid crystals encapsulated in a polymer.  The liquid mix of polymer and liquid crystals is placed between two layers of glass that includes a thin layer of a transparent, conductive material.  With no applied voltage, the liquid crystal molecules remain in a randomized configuration that refracts the light that enters the mixture, making it appear opaque.
  11. 11. This results in the translucent, "milky white" appearance. .
  12. 12.  When a voltage is applied to the electrodes, the electric field formed between the two transparent electrodes on the glass.  The molecules line up the direction of the electric field, allowing light to pass through what is now essentially a transparent surface.  The degree of transparency can be controlled by the applied voltage.
  13. 13.  control of light.  Energy Saving.  Ambient temperature control.  Protecting skin from damaging UV rays.  Low working voltage.  Long life – tested to in excess of 100,000 cycles.
  14. 14.  Conference rooms  Intensive-care areas  Building, hotels and offices
  15. 15.  www.helwan.edu.eg/chinese/wp- content/uploads/2013/08/1-4-8.pdf  http://www.glass-apps.com/

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