Civil Engineering Reference
In-Depth Information
Table 1 Different variants for the realisation of KfW efficiency house standards. The energy-related level of the KfW efficiency house 40 corresponds to the
proposed nZEB standard by Erhorn et al. (
2012
)
KfW efficiency
house 70
KfW efficiency
house 55
KfW efficiency house
40 (EnEV 2020 level)
Façade (W/(m
2
K))
U B 0.16
U B 0.16
U B 0.12
Ground floor/basement
ceiling (W/(m
2
K))
U B 0.24
U B 0.24
U B 0.18
Outer basement wall (W/(m
2
K))
U B 0.24
U B 0.24
U B 0.18
Roof (W/(m
2
K))
U B 0.16
U B 0.16
U B 0.11
Topmost ceiling (W/(m
2
K))
U B 0.16
U B 0.14
U B 0.11
U
W
B 1.1 W/(m
2
K)/g C 0.55
U
W
B 0.95 W/(m
2
K)/g C 0.55
U
W
B 0.8 W/(m
2
K)/g C 0.6
Windows
Heat bridges (W/(m
2
K))
DU
WB
B 0.025
DU
WB
B 0.025
DU
WB
B 0.025
Air tightness (1/h)
n B 0.6
n B 0.6
n B 0.6
System variants
Condensing boiler with solar
DHW supply or GSHP
or ASHP
Condensing boiler with solar DHW
supply and ventilation system with
heat recovery or GSHP with DHW
supply or ASHP with DHW supply
or GSHP with ventilation system with
heat recovery
GSHP with solar DHW supply and
ventilation system with heat
recovery or ASHP with solar
DHW supply and ventilation
system with heat recovery
DHW domestic hot water, GSHP ground source heat pump, ASHP air source heat pump
