The market situation of smart windows Recently the glass industry has shown a tendency to products based on energy saving and eco-friendly materials. accordingly, the smart window glass material as a new material is going to increase the awareness in the market. it has a transmittance adjusting function, with not only visible light transmittance but also UV and infrared ray transmittance. therefore smart window has been variously applied to construction sector, transport sector, and advertising sector Smart window principle Smart window uses the material of PDLC(Polymer Dispersed Liquid Crystal). PDLC film consists of two PET films. there is an ITO film between the two PET films in PDLC liquid crystals are dispersed into a liquid polymer. so the liquid mix of polymer and liquid crystals is placed between two layers of PET film. users can control PDLC film's transparency and opacity with the electrical on/off switch.
only this kinds of smart blind film can be detachable on the surface of exiting glass
highly transparent film state-of-the-art construction techniques and offers a clean and refreshing view with no line when it operation
low-power consumption technology of 5w/㎡ to realizing energy saving effect
it's possible to install and design by the world's largest widen size of 1,200mm
film has various color for your choose such as Milky White, Gray, Dsrk Gray and so on
Background growth of Smart Window The energy efficiency is likely to be a persistent concern of building managers, owners and construction companies throughout the period under consideration. Because smart windows are able to offer a clear and distinct solution here, we think that smart window makers will be able to ride the wave of energy shortage throughout the period under consideration. In reality most of the revenues that will be generated by smart window products will essentially be derived by the needs of building owners and managers to improve on energy conservation. Smart windows may be just what the doctor ordered when it comes to providing reduced energy use in buildings, because it can provide improvements in this regard of up to 40 percent.
Smart Window The "smart" in " smart windows" can be used to describe many different kinds of functionality including futuristic capabilities such as windows that can double as panel lighting or solar panels. Smart windows carry out a function such as blocking or transmitting sunlight on-demand in response to an external stimulus, such as an electric current provided by the user. This technology is based on liquid crystals dispersed in a polymer matrix that are sensitive to electric fields. it dims through the use of diffraction of light upon application of an electric filed. Smart windows can be embedded in building codes and have the implicit effect of broadening the addressable markers for green building products. In the context of this development, smart windows may also from an important part of net zero energy buildings. The general trends that we have discussed here are ultimately based on various aspects of the significant energy efficiency benefits that smart windows can bring in their wake.
Smart window classifiction Passive Smart window Responds to non-electrical stimuli(heat, UV) can't be manually controlled Active Smart window Responds to an electrical stimulus and is controllable manually or automatically EC(Electrochromic window)
Used for exterior glass applications, for solar control
Not used for interior privacy
Long transition time from clear to opaque. larger windows can take five to 20 minute
New glass must be installed no film option for existing glass
Not used for privacy as you can still see through it in dark(tinted)state
PDLC(Polymer Dispersed Liquid Crystal)
Can be used for interior or exterior glass application
Switches from opaque(milky white or gray) to clear in less than a second
Can run on standard 110-volt AC
Available in a self-adhesive film that can be applied to existing window
Provides total privacy in its opaque state(cannot be seen through)
SPD(Suspended Particle Devices)
In suspended particle devices(SPDs) a thin film laminate of rod-like nano-scale particles is suspended in a liquid and placed between two pieces of glass or plastic, or attached to to one layer
When no voltage is applied the suspended particles are randomly organized thus blocking and adsorbing light
When voltage is applied the suspended particles align and let light pass
Varying the voltage of the film varies the orientation of the suspended particle thereby regulating the tint of the glazing and amount of light transmitted
The visible light transmission at the darkest state of SPD glazing is around 0.5% and the process takes one to three seconds after power is applied regardless of the size of the window
The resulting dark blue shading blocks light and provides only partial privacy
Source : Energy saving & High insulation material by National Technology Policy Center
Next generation High-function & High sensitivity Smart Window Growth
