Civil Engineering Reference
In-Depth Information
Table 8
Tightening
of
maximum
values
of
the
average
heat
transfer
coefficients
of
the
heat-transmitting surface area of commercial buildings
Type
EnEV
2009
New buildings
till 31.12.2015
New buildings
from 1.1.2016
Opaque outer elements
0.35
0.32 (-8 %)
0.28 (-20 %)
Transparent outer elements
1.9
1.7 (-10 %)
1.5 (-21 %)
Curtain wall
1.9
1.7 (-10 %)
1.5 (-21 %)
Glass roofs, skylight, etc.
3.1
2.8 (-10 %)
2.5 (-19 %)
4. Introduction of control systems for the compliance towards energy performance
certificates, inspection reports of air-conditioning systems;
5. No change for existing buildings undergoing a refurbishment. Just the heat
transfer coefficient requirement for outer doors has been tightened by approx-
imately 38 %, and the trigger moment for the refurbishment of façades has been
changed slightly.
6. Introduction of the 'Model Building Approach' (also called EnEV easy) as
another alternative primary energy calculation method for residential buildings;
3.2.3 Act on the Promotion of Renewable Energies in the Heat Sector
(Heat Act, EEWärmeG)
The EEWärmeG is an important regulation enforcing the use of renewable ener-
gies in the heat sector. The law was introduced in 2009 and amended in 2011. Part
2 of the EEWärmeG states obligations for a specific share of the heating demand
(space heating and domestic hot water) that has to be produced by renewable
energy sources in all new buildings and public buildings undergoing a major
renovation. The overall target stated in the law is a 14 % renewable energy share
in the heat consumption of Germany by 2020.
The EEWärmeG defines a major renovation as 'any measure within a period not
exceeding two years, by which a building has:
1. its boiler replaced or the heating system switched to another fossil fuel and;
2. over 20 % of its envelope renovated'.
The EEWärmeG affects buildings with a useful floor area of more than 50
m$^2$ and which require heating or cooling. The requirements are clearly defined
for each type of renewable energy source (technology). These have to cover a
certain share of the total energy demand for heating and cooling and are defined as
follows:
• Solar energy: 15 %
• Gaseous biomass: 30 %
• Liquid/solid biomass: 50 %
• Geothermal energy and ambient heat: 50 %.
