Triple glazing

SGG

Developing the good solution for thermal insulation TRIPLE GLAZING UNITS

PLANITHERM速 ONE

Thermal insulation of glass: Thermal ex Ug = 5.8 W/m²K change linked to th ickness

Ug = 2.7 W/m²K

0°C outside 20°C inside Window of 2m² Heat loss=232W

Outside Convection (wind) Single Glazing Unit: Outer side of glass is cooled by convection (wind) Thermal exchange between outside and inside is only due to thermal conductivity of glass and can only be managed by glass thickness Thermal insulation is poor.

Outside Convection (wind)

Thermal exchang e li spacer g as (thickn nked to ess) and Radiation

Double Glazing Unit: In a DGU outside glass ply is still cooled by the wind, BUT as there are no convection inside the air space, inner glass ply is NOT cooled by convection.

The heat transfer is linked to spacer conductivity: type of gas, its thickness, AND radiation between the two glasses.

Thermal exchange is reduced by 2

Thermal insulation of Low E glazing: Ug = 1.1 W/m²K

Outside Convection

Low emis siv Radiation ity low

Thermal resitance improved: Ug = 1.1 W/m²K SGG ¨Planitherm ULTRA N

Low E DGU: Low Emissive coatings have a very low Absorbance in far IR (High Reflectance AND no Transmittance ); so that they emit a low amount of radiation in thermal range (far IR) Radiation exchange between the two glasses is strongly decreased. Thermal flow which goes through inner ply is reemitted inside: Inner glass ply is warmer Outer glass is colder

Thermal flow which goes out is reduced by 5 compared to Monoglazing

Low E glass: An invisible thermal shield Clear float glass

Low E glass Thermal radiation

Solar Radiation Vis.

100

80

20

20

0

0 0.8

Vis.

100

80

0.3

1.5

2.0

2.5

5

10

20

30

Thermal radiation

Solar Radiation

40

50

0.3

Wavelength in Âľm

0.8

1.5

2.0

2.5

Wavelength in Âľm

Transmittance Reflectance

5

10

20

30

40

50

Improvement of thermal insulation:

Coefficient d’isolation thermique UG en W / m² K

Convection Conduction Radiation

Bad Bad Bad

Good Medium Bad

Good Medium Good

Good Good Good

6

4

5.8 2.7

2

1.1

0.5

0 SINGLE GLAZING 4mm

DOUBLE GLAZING Without coating

Low E DOUBLE GLAZING

Low E TRIPLE GLAZING

0.36 GOOD INSULATED WALL according to RT2005

Low E: what are the limits of DGU? UG value versus emissivity DGU (4mm / 16mm - 90%Ar coating / 4mm) U value (4/ 16 - 90% Ar / 4)

1.7

We get closer and closer to the limits of thermal performances of Double Glazing Units

1.6 1.5 1.4

Ug of 1.0 W/m²K is still possible with an emissivity ξN = 0.01

1.3 1.2 1.1 1.0 0.9 0

2

4

6

8

10

12

14

Normal emissivity %

16

18

20

Why do we need Triple Glazing Units?

Increasing gas space improves Ug value 2

DGU: 4mm / xx mm 90% Argon / PLT ULTRA N 4mm

1.9 1.8

UG in W/m²K

1.7 1.6

O

1.5

d si t u

e

de i s In

1.4 1.3 1.2 1.1 1 5

7

9

11

13

15 gas space in mm

17

Thanks to Low E coating thermal exchange by radiation is stopped Thermal conductivity of air or gas is limiting the thermal insulation!

Why do we need Triple Glazing Units?

The outer pane get colder and the inner pane get warmer: 2

DGU: 4mm / xx mm 90% Argon / PLT ULTRA N 4mm

1.9 1.8

UG in W/m²K

1.7 1.6

Ex

ur e ri é t

té n I

r u rie

1.5 1.4 1.3 1.2 1.1 1 5

7

9

11

13

15 gas space in mm

17

19

21

23

25

Natural convection within the gas space Stop improvement on Ug value

Next step: Triple glazed A glass put in between the gas space will block this natural convection: TRIPLE GLAZING UNIT! DGU: 4mm / xx mm 90% Argon / PLT ULTRA N 4mm TGU: PLT ULTRA N 4mm / xx mm 90% Argon / 4mm PLX / xx mm 90% Argon / PLT ULTRA N 4mm

1.9

1.7

de i s ut O

Ug in W/m²K

1.5

1.3

1.1

0.9

2 x 8mm 2 x 16mm

0.7

2 x 10mm

2 x 19mm

2 x 12mm 0.5 5

10

15

20

25 gas space in mm

30

35

40

de i s In

Triple Glazing Unit and solar factor Low E coatings are on side 2 and 5 in a TGU (risk of thermal breakage if coating side 3 or 4) Decrease of the Solar factor CLIMAPLUS ULTRA N

CLIMATOP ULTRA N

Glazing composition

4mm PLX / 16mm 90% Argon / PLT ULTRA N 4mm (3)

PLT ULTRA N 4mm (2) / 12mm 90% Argon / 4mm PLX / 12mm 90% Argon / PLT ULTRA N 4mm (5)

Ug

1.1 W/m²K

0.7 W/m²K

TL

80%

70%

g – value

0.63

0.50

0.1

0

If negative: Heat gain > losses

If positive : Heat losses > gain

Energy balance in Passiv Haus:

-0.1

-0.2

Passiv Haus criteria: Ug – 1,6 (W/m²K) x g -0.3

SGG CLIMAPLUS ULTRA N

SGG CLIMATOP ULTRA N

REF Passiv Haus

SGG CLIMATOP MAX

PLANITHERM range: Advanced performance low-E glass.

SGG

PLANITHERM MAX: The first coating dedicated to triple glazing units Revolution in thermal insulation: A thermal insulation TWO times more SGG

performing than a Low E DGU. SEVEN times more insulating than a standard DGU without coating!

Ug W/m²K

DGU with PLT UN 1.1

TGU with PLT UN 0.7 – 0.5

TGU with PLT MAX 0.7 – 0.5

TL

80%

70%

74%

g – value

0.63

0.50

0.60

Exceptional energy balance Suitable for passive houses

SGG

PLANITHERM MAX

TRIPLE GLAZED UNIT: 4mm PLT MAX / 12mm gas / 4mm DIAMANT / 12mm gas / 4mm PLT MAX

Ug Value: 0.7 W/m²K (Argon) 0.5 W/m²K (Krypton) Light Transmittance TL: 74% Light Reflectance RL: 15% Solar factor g : 0.60

Same Solar gain as a Low E DGU with thermal insulation two times better!