Solar control coated glass

Light and Solar Energy

1500

2000

2500so

lar

en

erg

y (

W/m

²)UV visible Infra-red

55%42%3%

0

500

1000

0 500 1000 1500 2000 2500

Wavelength (nm)

so

lar

en

erg

y (

W/m

²)

760380

Glass and Light

Solar radiation

Visible light or daylightTransmittance (LT)

Reflectance Reflectance (LR)

SOLAR CONTROL

Solar radiation

Transmittance (ET)

Reflectance Reflectance (ER) Absorption (EA)

ao ai

g = solar factor = SHGC = ET + ai

Glass performance data

4 mm clear float glass SGG PLANILUX®

Light transmittance LT = 90%

Light Reflectance – outside Lr = 8%Light Reflectance – outside Lro = 8%

Solar factor g = 0.85

U – value [W/m².K] U = 5.8

Optimal characteristics

during summertime

Lig

ht T

ransm

itta

nce L

T

0.5

1

Optimal characteristics

during winter

Combinations of g (SHGC) and LT

Solar factor g solar heat gain coefficient SHGC

Lig

ht T

ransm

itta

nce L

T

10.50

Body tinted glass PARSOL®

SOLAR CONTROL

1 2 3 4

Body-tinted =

- Adding metal oxides during float-process

- Works on absorption and re-radiation

- Depth of color depending on glass-thickness

SOLAR CONTROL

- Depth of color depending on glass-thickness

- Limited range (green, bronze, grey, pink, blue)

SGG PARSOL®

Characteristics

• Bronze: transmits less visibleand more IR than Green

• Green or blue tints are better for daylighting (LT ↑ ; IRT ↓)

1

0.5 1

1

0.5

0g

LT

Body tinted glass or heat-absorbing glass:

• reduces the amount of solar energy transmitted through the glass

• reduces the light transmittance

but

the glass temperature risesthe glass temperature rises

⇓

MRT (mean radiant temperature) of the glass surface increases

⇓

Comfort of the occupants decreases

Body tinted glass PARSOL®

Pyrolitic coatings ANTELIO®

REFLECTASOL ®

SOLAR CONTROL

1 2 3 4

On-line coatings =

- Metal oxides added to glass-surface during

float-process (pyrolysis)

- On clear and on body-tinted glass (limited range)

SOLAR CONTROL

- Works on reflection (& absorption)

SGG ANTELIO®

Metallic oxides

SOLAR CONTROL

SOLAR CONTROL

1

LT

Body tinted glass

Winter

Monolithic / dgu

0.5 1

0.5

0g

Pyrolitic solar control glass

Body tinted glass PARSOL®

Pyrolitic coatings ANTELIO®

Off-line coatings COOL-LITE®

SOLAR CONTROL

Off-line coatings COOL-LITE®

COOL-LITE® ST

1 2 3 4

SOLAR CONTROL

Between 5 and 10 chambers

SnO2 Nickel Chrome Titanium

Sputtering of different metals

Glass

Coating stacksTiN

Glass

TE, TS, TB

TiN

SSTGlass

TiO2

NiCr Nx

SS SC/SR/SN

TiO2TiO2

SnO2

NiCr Nx

Glass

PB

Si3N4

GlassSi3N4

Nb or NbNST (Temperable coating)

RL %

30,0

35,0

40,0

45,0

50,0

ST108 - av

ST108 - ap

ST114 - av

ST114 - ap

ST120 - av

ST120 - ap

ST132 - av

ST132 - ap

RL %

Temperable off-line coated glass

TL %0,0

5,0

10,0

15,0

20,0

25,0

0,0 10,0 20,0 30,0 40,0 50,0 60,0

ST132 - ap

ST140 - av

ST140 - ap

ST150 - av

ST150 - ap

TL %

SGG COOL-LITE® ST 120Réflexion

NT T

T NT

Transmission

T NT

Bronze Antelio PB-114

Tl 44 43 13

Rlout 7 28 24

Te 39 41 11

Reout 7 20 20

Ae 54 39 69

SHGC 49 50 18

DV 6-15-6 + Ar (2)

100

20

40

60

80

100

Antelio Clair

Bronze

PB-114

R ext (%)

λλλλ (nm)

0

20

40

60

80

300 800 1300 1800 2300

Antelio Clair

Bronze

PB-114

T (%)

λλλλ (nm)

0

300 800 1300 1800 2300

SOLAR CONTROL

1

LT

Body tinted glass

Winter

Monolithic / dgu

0.5 1

0.5

0g

Pyrolitic solar control glass

Off-line solar control coated

glass

SOLAR CONTROLActual status

- building codes / regulations

� low U-values ⇒ low emissivity

� energy balance ⇒ SC and U-value i.e. RHG� energy balance ⇒ SC and U-value i.e. RHG

- environment (green buildings)

� high light transmittance LT

- aesthetics

� low outside reflectance

SOLAR CONTROL

1

LT

Body tinted glass

Winter

Monolithic / dgu

0.5 1

0.5

0g

Pyrolitic solar control glass

Off-line solar control coated

glass

Selectivity or Light to Solar Gain (LSG)

LSG = ratio of visible light transmittance to the Solar

FactorFactor

= LT/g

= LSG ⇒⇒⇒⇒ the more efficient the glazing is as a light source

SGG COOL LITE®

APPLICATIONS :

- Monolithic

- Laminated glass- Laminated glass

- Curved / Bent glass

- Insulating glass units

Monolithic :

- Only for ST, Classic : coating on surface # 2

- Take care for damage during construction !

SGG COOL LITE®

• Location of the coating

SGG COOL-LITE®

Coating always on #2

SPANDRELS :

- not opacified : LT <= 14 % and ventilated

SGG COOL LITE®

classic and ST

- Opacified : airspace of min 10 mm behind glass or full cover gluing with compatible material

- Rebates always well drained

SGG COOL-LITE® ST

SGG COOL-LITE® ST can be:

• processed into DGU without edge stripping

• laminated

• enamelled with a lead-free enamel (e.g. Ferro• enamelled with a lead-free enamel (e.g. Ferroseries 140)

• curved and curved tempered

• screen printed

SGG COOL-LITE® ST

ST 150 ST 120

ST 120 ST 150ST 120 – curved (r = 700mm)

ST 150 - laminated

Screen printed

SAINT-GOBAIN GLASS

COMFORT

Thermal InsulationThermal Insulation

C D V S P SAINT-GOBAIN GLASS COMFORT

Thermal Insulation

Thermal conductivity of glass

λ = 1.0 W/m.K

U4mm glass = 5.8 W/m²K U19mm glass = 5.3 W/m²K

C D V S P SAINT-GOBAIN GLASS COMFORT

Thermal Insulation

ArgonAir

U4/12/4 = 2.9 W/m²K U4/12/4 = 2.7 W/m²K

U4/6/4/6/4 = 2.1 W/m²K

U4/6/4/6/4 = 2.3 W/m²K

C D V S P SAINT-GOBAIN GLASS COMFORT

Thermal Insulation

U-value in relation to the cavity width

2

2,5

3

U-v

alu

e [

W/m

².K

]

0

0,5

1

1,5

2

0 5 10 15 20 25 30

Cavity width [mm]

U-v

alu

e [

W/m

².K

]

Air filled

Argon filled

C D V S P SAINT-GOBAIN GLASS COMFORT

Thermal Insulation – heat flow in a DGU

CONVECTION

T2T1

RADIATION

CONDUCTION

T2T1

T1 < T2

C D V S P SAINT-GOBAIN GLASS COMFORT

Thermal Insulation

RADIATION = Transfer of heat by radiation between two bodies at different temperatures

This transfer is proportional to the emissivity of these bodies

i.e. the emissivity is related to the ability of a surface to i.e. the emissivity is related to the ability of a surface to

irradiate the heat.

Emissivity ε is related to the surface characteristic of a body.

C D V S P SAINT-GOBAIN GLASS COMFORT

Thermal Insulation

Low - E coating

Radiation

Long wave heat energy is reflected back into the room