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Requirements for existing Buildings The system of requirements for existing buildings, which has been in place since 1984, and the level of requirements introduced in the year 2002 have not been changed. Requirements have to be met whenever fabric elements of heated or cooled space are build in for the first time or changed in a way that allows energetic improvement. In this case, the owner has the choice to either meet special requirements (u-value, see Figure 7) regarding the element in question or to prove that the building as a whole does not exceed 140 % of the requirements for a new building. Measures of low extent which tackle less than 20 % of the whole area of the element in question are excluded from these requirements. In Germany there does not exist a 1000-m²-threshold as foreseen by the directive.

Extension of more than 50 m² heated or cooled space added to existing buildings have to meet the requirements for new buildings. The same applies to a new installation or the modernisation of appliances and their main components (boilers, air-conditioning-centrals, pumps in heating systems etc.). The requirements concerning air-conditioning units have been introduced by the „EnEV 2007“ and apply to specific fan power, humidity control and in certain cases to the control of air volume flow. The specific fan-power should not exceed the values of class “SFP 4” given by EN 13779 (2005). Humidity control should always be done with separate settings for humidifying and de-humidifying. If the air volume flow of an appliance exceeds 9 m³ per m² floor area, the air volume flow should be automatically controlled.

Figure 7: Requirements for

existing buildings (in case of measures concerning fabric elements); the intended requirements of the draft EnEV 2009 are in some cases not directly comparable because of changes in the definition of measures.

Maximum U-Value Fabric elements

External walls

[External walls, when an insulation layer is added] Windows

[windows with special glazing] Glazing

[special glazing] Curtain walls

[curtain walls with special glazing] Upper ceilings, pitched roofs Flat roofs

Ceilings and walls between heated & unheated space or ground

• •

Measures on the cold side Measures on the warm side

0,40 0,50

Inspection of Heating- and Air-Conditioning Systems

The regular inspection of boilers has been mandatory in Germany for many years, namely to a much larger extent and with shorter intervals than foreseen in the EPBD. The requirements are mainly included in an ordinance within the scope of the Emission-Act, energetic aspects by limiting the flue-gas losses are also covered. If a boiler does not comply with the requirements, it has to be replaced. The inspections are carried out by the local master chimney sweeper on behalf of the responsible authorities. The chimney sweeper keeps a register of all the boilers in the region. The operator of the boiler has to pay a fee, which is officially fixed according to the extent of work (e. g.: gas boiler with ranged output of 24 kW about 25 € per year).

In this way, thousands of boilers are due for replacement every year which results in a reduction of the average age of the boiler stock in Germany. Furthermore, for boilers installed before 1978 a replacement is generally

EPBD Buildings Platform > P073_EN_Germany-April2008

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7

0,30 0,30 / 0,50

in case of normal internal temperatures [kWh/m²·K]

EnEV 2007

0,45

[0,35] 1,70

[2,00] 1,50

[1,60] 1,90

[2,30] 0,30 0,25

Draft EnEV 2009

0,24 1,30

[2,00] 1,10

[1,60]

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