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THERMAL TRANSMITTANCE

(UNI EN ISO 10077 / 1)

The thermal transmittance coefficient indicates the level of energy (warmth/refrigeration) dispersed through the surface of the window. To determine this, the window’s specifications (thermal coefficient of double glazing, wood type, average thickness of frame/sash, inner and outer resistance) must be entered in a specific calculation program. The coefficient is expressed in W/m²K. The resulting number is directly proportional to the heat dispersed through the window.

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WINDOW TYPE

Doc Legno window art 92/92

BURNING OIL CONSUMPTION / WINDOW M2 SURFACE PER YEAR

9 LITRES

INNER WINDOW FRAME TRANSMITTANCE

Uw=0,8W/m2K

WINDOW TYPE

Doc Legno window art 68/68

BURNING OIL CONSUMPTION / WINDOW M2 SURFACE PER YEAR

11 LITRES

WHOLE WINDOW TRANSMITTANCE

Uw=1,4W/m2K

WINDOW TYPE

Doc Legno window art 68/2

BURNING OIL CONSUMPTION / WINDOW M2 SURFACE PER YEAR

15 LITRES

WHOLE WINDOW TRANSMITTANCE

Uw=1,8W/m2K

WINDOW TYPE

Traditional window with simple glass

BURNING OIL CONSUMPTION / WINDOW M2 SURFACE PER YEAR

50 LITRES

WHOLE WINDOW TRANSMITTANCE

Uw=4,5W/m2K

Values of characteristic parameters of building elements and technical plants in existing edifices subjected to energy upgrading.

NATIONAL VALUES

PUBLISHED IN No. 39 GAZZETA UFFICIALE (15/07/2015).

Maximum U thermal transmittance of transparent and opaque technical openings and of rolling shutter boxes, inclusive of fixtures, opening outwards and onto non climate-controlled spaces subjected to upgrading.

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U(W/M2K)

2015: 3,20

2021: 3,00

U(W/M2K)

2015: 3,20

2021: 3,00

U(W/M2K)

2015: 2,40

2021: 2,00

U(W/M2K)

2015: 2,10

2021: 1,80

U(W/M2K)

2015: 1,90

2021: 1,40

U(W/M2K)

2015: 1,70

2021: 1,00

INDIVIDUAL REGIONS ARE FREE TO APPLY IMPROVED VALUES

E.G. LOMBARDY
Regional Decree no.6480 dated 30.7.2015

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E.G. EMILIA ROMAGNA
Decree no.967 - 2015
24-7-2015 – Official Journal of Emilia-Romagna Region – Part II - No.184.

Maximum U thermal transmittance of transparent and opaque technical openings and of rolling shutter boxes, inclusive of fixtures, opening outwards and onto non climate-controlled spaces subjected to upgrading.

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