Civil Engineering Reference
In-Depth Information
In those cases, the EnEV primarily prescribes requirements on component level.
Accordingly, modifications are to be designed in such a way that the heat transfer
coefficients of the exterior components concerned as established in Table
3
are not
exceeded.
Alternatively, these requirements are considered to be fulfilled if the modified
residential or non-residential buildings do not exceed the overall requirements for
new buildings by more than 40 percent. The requirements for new buildings are as
follows (Regierung der Bundesrepublik Deutschland
2009
):
1. Residential buildings to be constructed are to be designed in such a way that the
annual primary energy demand for heating, hot water preparation, ventilation
and cooling does not exceed the value of the annual primary energy demand for
a reference building of the same geometry, building floor space and alignment
with the technical reference design given in Table
4
and the maximum value of
the specific transmission heat loss related to the heat-transmitting surface area
in accordance with Table
5
.
2. Commercial buildings to be constructed are to be designed in such a way that
the annual primary energy demand for heating, hot water preparation, venti-
lation, cooling and lighting installations does not exceed the level of the annual
primary energy demand for a reference building of the same geometry, net floor
space, alignment and utilisation, including the arrangement of the utilisation
units to the technical reference design indicated in Appendix 2 Table
5.1
of the
EnEV (due to complexity not shown here) and the maximum levels of the
average heat transfer coefficients of the heat-transmitting surface area in
accordance with Table
6
are not exceeded.
The three mentioned tables can be found on the following pages.
Depending on the specific kind (single- or multi-family building) and archi-
tecture, the maximum primary energy demand of the reference building in average
totals about 65 kWh/m
2
a (Schimschar et al.
2011
) (Tables
5
,
6
).
Amendment 2013/2014
The EnEV has to be amended in order to transpose all requirements of the recast
EPBD. Thus, the Federal Ministries of 'Transport, Building and Urban Develop-
ment' and 'Economics and Technology' developed a ministerial draft
(BMVBS,BMWI
2012
) which is currently being commented on by the Federal
States and associations in order to allow the drafting of an official final version of
the government. Several months may still be necessary before the final version will
enter into force; thus, it is possible that the new EnEV amendment will even be
named 'EnEV 2014'. The most important changes compared to the EnEV 2009 are
as follows (status: last version from October 2012):
