Contract: EIE/07/069/SI Duration: October 2007 – March 2010Version: March, 2010 Energy performance certification for new and existing buildings Differences in approach, choice and CEN standards application? Kees Arkesteijn ISSO/the Netherlands

slide 2 Outline The EU CENSE project Quality aspects Building characteristics Difference between new and existing buildings Reproducibility Conclusion and Outlook See for more details: Information Paper P156, Energy performance certification for new and existing buildings, March 2010

slide 3 The EU CENSE project (Oct March 2010) Aim of the project: To accelerate adoption and improve effectiveness of the EPBD related CEN- standards in the EU Member States These standards were successively published in the years and are being implemented or planned to be implemented in many EU Member States. However, the full implementation is not a trivial task Main project activities: A.To widely communicate role, status and content of these standards; to provide guidance on the implementation B.To collect comments and good practice examples from Member States aiming to remove obstacles C.To prepare recommendations to CEN for a “second generation” of standards on the integrated energy performance of buildings

slide 4 Brief introduction A brief introduction to the CENSE project and the CEN- EPBD standards is provided in a separate presentation:

slide 5 More information More information and downloads: Disclaimer: CENSE has received funding from the Community’s Intelligent Energy Europe programme under the contract EIE/07/069/SI The content of this presentation reflects the authors view. The author(s) and the European Commission are not liable for any use that may be made of the information contained therein. Moreover, because this is an interim result of the project: any conclusions are only preliminary and may change in the course of the project based on further feedback from the contributors, additional collected information and/or increased insight.

slide 6 Building characteristics To prepare an energy performance certificate one has to obtain building and system characteristics, for example: The building envelope: Thermal, solar and daylight properties and the area and air leakage properties of the building envelope System for heating and cooling: The type and properties of the heating and cooling generators and the type and properties of the distribution system. Ventilation: Type and properties of ventilation system, heat recovery. System for hot water preparation: The type and properties of the hot water generator for the building. Lighting: Type and properties of the lighting system and the control systems.

slide 7 How to get information about building characteristics Building characteristicHow to get For new buildingFor old existing building Thermal/solar/daylight properties of the building envelope Building specifications and drawings of the building Non-destructive Inspection in the building System for heating and cooling Description of the heating and cooling system specifications Non-destructive Inspection in the building VentilationDescription of the ventilation system specifications Non-destructive Inspection in the building System for hot waterDescription of the hot water system specifications Non-destructive Inspection in the building LightingDescription and specifications of the lighting system and lighting plan Non-destructive Inspection in the building

slide 8 Quality aspects Quality aspects associated with drawing up the procedures for an energy performance certificate at national or regional level: Robustness Transparency Reproducibility Sufficient accuracy Cost-effectiveness Source: Builddesk study for Dutch government (NL)

slide 9 Inspection of buildings Cost-effectiveness Full-required input too labour-intensive for existing buildings default values and simplified procedures are necessary Quality aspects Input sufficiently distinctive to see the effect of improvements in the energy performance Gathering characteristics of the building envelope and heating system

slide 10 Reproducibility-> dilemma New buildingsNew BuildingsExisting buildings Design specificationYesNot available Inspection Building siteYes Detailed approach -> New buildings Less detailed approach-> Existing buildings Different result

slide 11 Comparison of 2 identical buildings 1. Accept that the rating result depends on the information available  Different results 2.Ignore any information which would typically not be available in an existing building and use conservative values, to obtain the same results for the two buildings  Same results, but extra information is not rewarded. 3.Ignore any information which would typically not be available in an existing building, but use moderate (not too conservative) default values (e.g. depending on the building's age), to obtain the same results for the two buildings  Same results, but less information is not punished. No extra info Extra info 450 MJ/m MJ/m MJ/m MJ/m 2 Different information available, three options

slide 12 Conclusion and Outlook National standard or building regulation writers must be aware of these effects depending on the choice they made Different options are possible with regard to the choice between detailed or simple methods for specific components They must be aware of advantages and disadvantages for reproducibility, cost-effectiveness, consistency and accuracy

slide 13 More information More information and downloads: Disclaimer: CENSE has received funding from the Community’s Intelligent Energy Europe programme under the contract EIE/07/069/SI The content of this presentation reflects the authors view. The author(s) and the European Commission are not liable for any use that may be made of the information contained therein. Moreover, because this is an interim result of the project: any conclusions are only preliminary and may change in the course of the project based on further feedback from the contributors, additional collected information and/or increased insight.