By Dr. Saad Baradiy, iproplan® Planungsgesellschaft mbH, Germany.
The author will explain the state of the art in Germany with current practice examples:
1. Implementation of the aspects of energy efficiency
2. Use of renewable energy
3. Environmental protection
4. Evaluate of economic aspects by using of renewable energy
5. Implementation of sustainability into practice.
Saving of energy becomes very popular worldwide. Therefore the economies in several countries are affected by the financial subventions for energy. Politicians, Ministries and Institutions are aware of the problems in the building industry. As a consequence, regulations and standards have been invoked. The implementation of these norms often fails in the praxis due to significant problems, e.g.:
1. Missing experience of the authorities in the praxis
2. Missing of suitable construction details and realistic analysis methods in the regulations and standards (e.g. algorithm of calculation for the legal standards)
3. Missing expert knowledge and lack of experience of engineering, architecture and construction companies.
The Energy Saving Ordinance (“Energieeinspaarverordnung (EnEV)”) is an important part of the energy- and climate policy of the German Government. Merging the Thermal Insulation Ordinance and the Heating Appliances Ordinance being valid up to then, the Energy Saving Ordinance was released for the first time in 2002 and amended for the first time in 2004. In order to implement the first European Directive on Energy Performance of Buildings (2002/91/EC), the EnEV was reissued in 2007 and was once more amended in 2009 following the government’s decision “Integriertes Energie- und Klimaprogramm (IEKP)” (Integrated Energy and Climate Programme).
The introduction of energy certificates in all member states of the European Union was required in course of the implementation of the first Directive of Energy Performance of Buildings. Since January 2009, in addition to the above mentioned requirements, new buildings have to comply with additional demands given by the Renewable Energies Heat Act (“Gesetz zur Förderung erneuerbarer Energien im Wärmebereich (Erneuerbare-Energien-Wärmegesetz – EEWärmeG)”). This results in numerous reciprocal effects concerning the calculations and the proof of compliance. In particular, the partial use of renewable energies demanded by the Renewable Energies Heat Act can have a major impact on the primary energy demand according to the Energy Saving Ordinance.
The German Certification System for Sustainability (DGNB) assesses buildings and urban districts which demonstrate an outstanding commitment to meeting sustainability objectives. The sustainability concept of the DGNB System is broadly based and goes beyond the well-known three-pillar model. The DGNB System covers all of the key aspects of sustainable building: Environmental, economic, sociocultural and functional aspects, technology, processes and locations.
The first four quality sections have equal weight in the assessment. This means that the DGNB System is the only one that gives as much importance to the economic aspect of sustainable building as it does to the ecological criteria. The assessments are always based on the entire life cycle of a building. Of course the focus is always also on the wellbeing of the user. It is crucial that the DGNB does not assess individual measures but instead the overall performance of a building or urban district.
Dr.-Eng. Saad Baradiy, is Consulting Engineer, Head of Building Physics Department iproplan® Planungsgesellschaft mbH, Germany. Court appointed, publicly appointed and sworn expert witness for Building Engineering Physics. Certified Specialist of Chamber of Engineers for Energy Efficiency in Buildings. Senior Auditor for Sustainability (DGNB) / Expert on BNB-System.