Documentation of the performance gap

Søren Østergaard Jensen, Kim B. Wittchen, Jørgen Rose

Research output: Contribution to conference without publisher/journalPaper without publisher/journalResearchpeer-review

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It is the general experience that energy efficient new or renovated buildings perform differently than expected with regard to energy consumption. The buildings often have higher energy con-sumption than expected.
The reasons for the difference between the calculated energy demand during the design phase and the realized usage are typically:
• errors in the input to the design tool or the design tool cannot handle specific features of the building correctly,
• changes in the design of the building and/or constructions as well as energy service sys-tems during the building process,
• other demands and usages than the standard conditions used in the applied design tool,
• different climatic conditions compared to the weather data used in the design tool,
• faults, inadequate balancing and commissioning of the building constructions and the energy service systems of the building.
The performance of energy efficient buildings is furthermore more sensitive to differences be-tween the assumed and the actual design than earlier, less energy efficient buildings. Therefore, it is not possible simply to compare the calculated annual energy demand from the design phase with the measured annual energy usage when evaluating if a building fulfils the requirements specified during the design phase.
Based on the above bullet points (Jensen, 2013) describes a method on how to evaluate if a building performs as expected. This method has been utilized in the following.
Original languageEnglish
Publication date10 Apr 2019
Number of pages5
Publication statusPublished - 10 Apr 2019
EventThe Building as the Cornerstone of our Future Energy Infrastructure: The importance of dynamic and real data for reliable assessment - University of the Basque Country, Bilbao, Spain
Duration: 10 Apr 201911 Apr 2019


SeminarThe Building as the Cornerstone of our Future Energy Infrastructure
LocationUniversity of the Basque Country
Internet address

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