The Federal Office for Building and Regional Planning

Publication Benchmarks for the energy performance of non-domestic buildings - reference values for energy certification

BBSR-Online-Publikation 09/09, Eds.: BMVBS/BBSR, March 2009

Series: BBSR-Online-Publikation Published: 2009

Editing:
ARGE Benchmark, Bruchköbel (contractor)
Lars Karopka, Andreas Klöffel MSc, Ingo Therburg, Dr. Roland Kopetzky, Dr. Tim Weber, Sabine Kunkel

Federal Institute for Research on Building, Urban Affairs and Spatial Development, Bonn
Horst-Peter Schettler-Köhler (contractor) horst.schettler@bbr.bund.de , Andrea Vilz andrea.vilz@bbr.bund.de

Abstract

The German implementation of the Directive 2002/91/EC of the European Parliament and of the council of 16 December 2002 on the energy performance of buildings is carried out through the amendment of the German "Energieeinsparverordnung" (EnEV). The new EnEV was passed on 24 July 2007.

In principal, the new EnEV allows a free choice between asset and operational rating approaches for non-domestic buildings. Data collection simplifications for the asset rating and rules for the operational ratings are published in legal publications. These publications include reference values for the operational ratings. The development of reference values for non-domestic buildings is mainly based on the analysis of data on public buildings. With the present study, the database has been extended to non-public buildings.

A consortium and a network of cooperation partners were set up to carry out data collection. In the context of non domestic buildings, the operational rating is not "the cheap solution with a low level of quality", but has the advantage that the quality of the building operation is included in the energy certification. Past experience has shown that buildings are often not built and operated in the way in which they had originally been planned.

The energy certification of buildings based on energy consumption may be hindered by usage influences in the buildings. Therefore different approaches to reducing the influence of usages on energy certification are shown. These range from building categories to tailored benchmarks.

The building categories of the existing reference values is based on the German "Bauwerkszuordnungskatalog" (BWZK), a structure for building categories, which was further developed to analyze building costs for public buildings. In this study, the BWZK was adapted to the needs of private buildings. However, as adaptation was only possible by making major changes to structure, a separate list of building categories for private non-domestic buildings was developed as an alternative.

The number of required building categories increases in line with building complexity. At the same time, the amount of available buildings is decreasing dramatically. Based on this information, it does not seem useful to start an endless process of further differentiation of building categories. Therefore the new building structure was conceived with a view to using "mixed uses". This means that reference values of complex buildings can by assembled according to their usage.

Different paths reducing the influence to the usage of the energy performance are shown. These are the considerations of the usage time and special energy usages (such as production). Finally the method of tailored benchmarks is shown, which is currently on the way to become the silver bullet of energy performance calculation methods.

In total, the energy consumption of 5052 buildings was analysed. There is insufficient statistical data on underground car parks or flat-rate values for the electricity consumption of tenants. Therefore assessments based on existing benchmarks and calculations using DIN V 18599 were made.

For all building categories, the results are graphically represented and published in a separate appendix.


The abstract is part of the German publication "Benchmarks für die Energieeffizienz von Nichtwohngebäuden - Vergleichswerte für Energieausweise", BBSR-Online-Publikation 09/09, Hrsg.: BMVBS/BBSR, March 2009, Bonn
ISSN 1868-0097, urn:nbn:de:0093-ON0909R223
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