Civil Engineering Reference
In-Depth Information
Table 3 Maximum values of heat transfer coefficients in initial installation, replacement and
renovation of components (Regierung der Bundesrepublik Deutschland
2009
)
Line
Component
Measure
according to
Residential buildings
and zones of commercial
buildings with indoor
temperatures C 19 C
Zones of
commercial
buildings with
indoor temperatures
from 12 to \ 19 C
Maximum values of heat transfer coefficients
U
max
1)
1
2
3
4
0.24 W/(m
2
K)
0.35 W/(m
2
K)
1
Outside walls
No. 1a to d
1.30 W/(m
2
K)
2)
1,90 W/(m
2
K)
2)
2a
Outside windows,
French doors
No. 2a and b
1.40 W/(m
2
K)
2)
1.90 W/(m
2
K)
2)
2b
Skylights
No. 2a and b
1.10 W/(m
2
K)
3)
2c
Glazing
No. 2c
No requirement
1.50 W/(m
2
K)
4)
1.90 W/(m
2
K)
4)
2d
Curtain walls
No. 6 sentence 1
2.00 W/(m
2
K)
3)
2.70 W/(m
2
K)
3)
2e
Glass roofs
No. 2a and c
2.00 W/(m
2
K)
2)
2.80 W/(m
2
K)
2)
3a
Outside windows,
French doors,
skylights with
special glazing
No. 2a and b
1.60 W/(m
2
K)
3)
3b
Special glazing
No. 2c
No requirement
2.30 W/(m
2
K)
4)
3.00 W/(m
2
K)
4)
3c
Curtain walls with
special glazing
No. 6 sentence 2
0.24 W/(m
2
K)
0.35 W/(m
2
K)
4a
Ceiling, roofs and
roof pitch
No. 4.1
0.20 W/(m
2
K)
0.35 W/(m
2
K)
4b
Flat roofs
No. 4.2
0.30 W/(m
2
K)
5a
Ceilings and walls
against unheated
spaces or the earth
No. 5a, b, d and e
No requirement
0.50 W/(m
2
K)
5b
Floor construction
No. 5c
No requirement
0.24 W/(m
2
K)
0.35 W/(m
2
K)
5c
Ceilings bordering
external air below
No. 5a to e
1. Requirements for new buildings are further tightened towards the EPBD
requirement of nearly zero-energy buildings: primary energy requirements in
steps: first by 12.5 % (in January 2014); from January 2016 by 25 % (for all
new buildings), both compared to the requirements of the EnEV2009;
2. Tightening of building shell requirements for residential buildings (specific
1. Reduction in the primary energy factor of electricity from 2.6 currently to 2.0 in
2014 and then to 1.8 in 2016;
2. Introduction of the obligation for publishing energy performance indicators in
real estate advertisements.
3. Rescaling of the 'Energy ranges' in energy performance certificates of resi-
dential buildings up to 250 kWh/m
2
a and strengthening of modernisation
recommendations;
