Foto: Frontansicht des sozialen Wohnbaus Mühlweg in Wien

IEA EBC Annex 71: Building Energy Performance Assessment Based on In-situ Measurements

The requirements on building envelope and on building technology are steadily increasing. There is a lack of monitoring and analysis methods to control the quality of the built implementation. The objective is to provide methods for an on-site (in situ) assessment of the actual energy performance. Based on the results from EBC Annex 58, this Annex takes the step towards practicable characterization procedures.

Short Description

The requirements on building envelope and on building technology are steadily increasing. The correct implementation in planning and construction is thereby demanding. While the quality of planning can already be well controlled via software tools and certification, there is a lack of reproducible and practical monitoring and analysis methods to control the quality of the implementation and determine the cause of a possible deviation.

The aim of this project is to provide the methodological basis for an on-site (in situ) assessment of the effective energy efficiency. The project is based on the results of Annex 58; the step towards practicable and application-friendly characterization procedures based on physical and statistical methods is now to be taken. The goal is to predict the energetic behaviour and to extract energy performance indicators for quality assurance.

The work in this Annex is divided into the following Subtasks (ST):

  • ST 1 - Collection of the available input data
  • ST 2 - Identification of the energetic behavior of buildings
  • ST 3 - Identification of physical parameters of buildings
  • ST 4 - Towards quality assurance
  • ST 5 - dissemination, collaboration in the excellence network

The aim of the Austrian participation is to analyze and deepen the fundamentals developed within the international framework and evaluate its possible applications, in particular with respect to quality assurance measures for highly energy-efficient buildings. In this way, deviations from the expected behavior could be quickly recognized during a so-called "extended commissioning phase". If necessary, remedial measures could be then taken immediately.

Within the framework of ST 1, the Austrian contribution examines the possibilities for using „readily available" data sources, such as building automation or smart meter. The aim is to find economical and minimized approaches that can further improve the results of the methods in ST 2 and 3. Legal requirements and data privacy of the building users shall also be considered. Austrian contributions within ST 2 are aimed at the development of prediction models for the characterization of buildings with regard to their thermal / energetic behaviour. In doing so, the data base necessary for this purpose is to be reduced as far as possible in order to avoid complex data acquisition while ensuring a sufficiently accurate forecast. In the framework ST 3, the identification methods developed in this Annex are to be tested on real buildings with a focus on quality assurance. For this purpose, an apartment of an energy-efficient building will be extensively monitored in the uninhabited and inhabited state. The testing will include both stationary (co-heating) and dynamic (ROLBS) in known or modified form. In this way, the impact of user behaviour and other disturbing variables on the measurement results from occupied buildings can be analyzed. A cost-benefit analysis shall document the different identification methods and provide contributions for Subtask 4.


Austria, Belgium, Denmark, Estonia, France, Germany, Italy, Netherlands, Norway, Spain, United Kingdom

Contact Address

AB Energieeffizientes Bauen, Universität Innsbruck
Rainer Pfluger
Technikertr. 13, 6020 Innsbruck

Institut für Rechnergestützte Automation, TU Wien
Susanne Metzger

AIT - Austrian Institute of Technology GmbH
Max Blöchle

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