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Energy savings according to the Energy Saving Ordinance (EnEV)

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In certain cases, calculating the demand for primary energy (non-renewable) according to the specifications of the EnEV serves as proof of compliance with legal requirements and, in general, also as proof when applying for grants for energetic modernisation. The calculated demand of delivered energy mainly serves as an indicator and as basis for classification in demand-based energy certificates.

For the calculation of energy savings according to EnEV, standardised conditions are set. These are determined by the EnEV and the applicable standards (DIN V 18599-10, DIN V 4108-6, DIN V 4701-10). When comparing energy efficiency of different buildings, the “standard calculation” ensures that the same conditions are applied.

The results of the "standard calculation" can differ considerably from the real con-sumption values. The actual conditions differ from the standard conditions - for residential buildings, e.g., regarding:

  • interior temperatures,
  • exterior temperatures,
  • ventilation, and
  • consumption of domestic hot water.

If in case of an existing building input values for the calculation (such the exact U-value of the existing structure) are unknown, to a certain extent replacement assumptions may be used. Official bulletins are issued for this purpose. Calculating energy demand according to EnEV is carried out by specialised engineers or architects. These professionals use special calculation software and - as an additional feature - are also able to perform a realistic estimation of energy consumption and savings potential.

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