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the metered consumption of at least the recent 3 years (with neutral- ised climatic impact). This freedom of choice is limited for residential buildings with less than 5 flats, if they do not comply with the first German Thermal Insulation Ordinance of 1977 – the energy certificate based on the calculated demand becomes mandatory for these build- ings.

› Mandatory maintenance, a graduated inspection-scheme and minimum requirements have been introduced for new air-conditioning appliances and for modernisation/replacement of these appliances.

The existing inspection scheme for boilers which is based on the existing Emission-Act, has been kept unchanged. No mandatory inspection of heating systems shall be introduced. Germany has formally chosen option b of Article 8.

Requirements for new residential buildings

The requirements for new residential buildings depend of the surface- volume-ratio (A/V) and – in case of central hot-water supply – of the buildings floor area (AN). Figure 1 shows the table from annex 1 of the ordinance.

Surface-

volume- ratio A/V

≤0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0

≥1,05

Primary energy demand per square meter useful floor area [kWh/(m²⋅a)]

Residential buildings except those in column 3

66,00 + ΔQTW 73,53 + ΔQTW 81,06 + ΔQTW 88,58 + ΔQTW 96,11 + ΔQTW 103,64 + ΔQTW 111,17 + ΔQTW 118,70 + ΔQTW 126,23 + ΔQTW

130,00 + ΔQTW With

ΔQTW =

100m + AN

2600kWha

2

Figure 1: Requirements for new residential buildings

New calculation method according to DIN V 18599 The calculation method according to DIN V 18599 is a holistic assessment of the buildings thermal shell, build-in lighting installation and appliances for heating, ventilation, cooling and hot-water supply. It consists of ten parts with well-defined interfaces. Symbols, technical terms and indices are used and defined in a similar and comprehensive way for the different disciplines throughout all parts. The calculation scheme is shown in Figure 2.

Part 10 of DIN V 18599 contains the conditions regarding climate and use applicable for the calculations. Such conditions are also listed for residential buildings, which make the standard applicable for these buildings too - but the EnEV currently does not include any application of the standard for residential buildings. This option is due to be introduced by the current amendment (“EnEV 2009”).

Basic elements of DIN V 18599 – especially concerning heating appliances – were introduced to the new European standards in the course of the Ger-

EPBD Buildings Platform > P073_EN_Germany-April2008

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3

Residential buildings primarily with electric hot water supply

83,80 91,33 98,86

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