electrochromic laminated glass gesimat ec - berlin innovation · switching sequence of an...

Switching sequence of an electrochromic laminated glass

Electrochromic Laminated GlassGesimat EC

- gradual change of light and heat transmission

- in the visible spectral range between 8 and 75 %

- in the total range of solar radiation between 6 and 52 %

- contrast ratio > 9 : 1

- switching time about 10 min for one complete switching step

- switching voltage ca. 1-3 V d.c.

- the reflectivity does not change

Construction and Delivery Form

Function and Use

SwitchableWindows

- electrically switchable flat glass laminates for building glazing

- two coated glass panes + ion conducting PVB interlayer

- lamination with LSG process, LSG compatible construction for

further processing to double or triple pane IGU

- electrical connections with wires from the laminated EC glass

- available formats: up to 1000 mm x 2400 mm

- thickness: e.g. 9 mm or 13 mm (always 2 x glass + foil)

- with electronic control unit

- can be delivered as laminated EC glass or as EC IGU

An electrochromic layer system sandwiched between two glass

panes of a laminated glass can be reversibly switched between

colorless and blue by application of small d.c. voltages.

Energy is only necessary for switching between different coloration

states, not for retaining a switching state.

- regulation of light and heat transmission through a glazing

without additional mechanical shading is now possible

- prevention of overheating and glare due to intensive solar radiation

- a high light transmission (75%) in the bleached state enables an

efficient daylight use and solar energy gains in winter

- a free view through the glass from inside the building is always

maintained

Transmission Control during Switching

Glass

Glass

TCO

TCO

Polymer electrolyte

First electrochromic layer

Second electrochromic layer

Uncharged Charged

ExternalIrradiation

Reflection

Transmission Transmission

Reflection

Absorption

ExternalIrradiation visvis

IR IR

Innovationspark WuhlheideBuilding 201Koepenicker Str. 32512555 BerlinGermany

Phone: +49 (0)30 / 47389251 +49 (0)30 / 47389252e-mail: [email protected]: www.gesimat.de

Switching effect

Electrotropic Laminated GlassGesimat ET

- gradual variation of the specular transmission (clear view)

- switching time about 1 second

- switching voltage 35-115 V A.C.2- energy demand: 10 W / m in the transparent state

- total light transmittance (diffuse + directional) changes between

84 % (clear state) and 74 % (milky state)

Electrotropic windows can be switched by the user between a

transparent and a milky glass state. Two options are available:

digital switching on / off or gradual switching.

Electrotropic glass laminates are especially well suited for

switchable privacy applications.

You can choose by yourself, if you are visible by other people or not.

Even with privacy function on, you still have nearly the same

light and heat transmittance through the glass as with clear view.

Electrotropic glass is ideally suited for temporary separation of

private or business areas (bathrooms, kitchen, meeting rooms etc.).

Transparent Milky glass

500 750 1000 1250 1500 1750 2000 2250 25000

10

20

30

40

50

60

70

80

90

100 0 V t

V=0

20 V tV=0,01

30 V tV=0,10

40 V tV=0,32

60 V tV=0,56

120 V tV=0,67

Directional Transmission Degree

Wavelength / nm

Tra

nsm

itta

nce

/ %

- electrically switchable flat glass laminates for building glazing

- two glass panes + interlayer + electrotropic foil

- LSG compatible construction for further processing to double

or triple pane IGU

- electrical connections with wires from the laminated ET glass

- delivery sizes: up to 1100 mm x 2530 mm

- thickness: e.g. 7, 9,11 or 13mm (always 2 x glass + foil)

- with electrical control unit, optional mit dimmining function

- can be delivered as laminated ET glass or as ET IGU


SwitchableWindows



Function and Use

Without VoltageWith Voltage

Reflection

Directional

Reflection

DiffuseExternalirradiation

Externalirradiation

IR

vis vis

IR


Glass

Glass

Interlayer

Interlayer

Electrotropic Film

Thermochromic Laminated GlassGesimat TC

- gradual change of the light transmittance in dependence on

glass temperature

- in the visual spectral range between 74% (20°C) and 23% (62°C)

- contrast ratio > 3 : 1

- NIR range is also switching

- nearly color neutral TC anthracite

- also available as TC blue and TC bronze

Glass

Glass

Thermochromic Interlayer

300 400 500 600 700 800 900 1000 11000

10

20

30

40

50

60

70

80

90

100

bleached tV=0.74

colored tV=0.23

Wave length / nm

Tra

nsm

itta

nce

/ %

20°C

62°C

SwitchableWindows

- thermally switching flat glass laminates for building glazing

- two glass panes + thermochromic interlayer

- lamination with LSG process, LSG compatible construction for

further processing to double or triple pane IGU

- no electrical connections and no electronic control unit necessary

- delivery sizes: up to 1100 mm x 2530 mm

- thickness: e.g. 7, 9,11 or 13 mm (always 2 x glass + foil)

- can be delivered as laminated TC glass or as TC IGU



Function and Use


Uncolored Colored

External

External

Irradiation

Reflection

Transmission Transmission

Reflection

Absorption

Irradiation visvis

IR IR


Thermochromic glasses are glass laminates whose light trans-

mittance varies as a function of glass temperature. Special

substances in the interlayer sheet, which itself colorize by heating,

are responsible for this property.

Advantage of the thermochromic glazing is their function without

any wiring and control. The switching takes place automatically as

a result of the heating of the panes by the absorbed solar energy.

The higher the glass temperature, the deeper is the coloring. The

switching takes only place when it is necessary: in direct sunlight

and warm weather. In cold weather on the other hand, the panes

remain bright and ensure secondary energy gains by light

and heat.

electrochromic laminated glass gesimat ec - berlin innovation · switching sequence of an...

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