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Sustainable refurbishment of selected quarters in Innsbruck

COMPARISON OF MEASURED AND CALCULATED ENERGY DEMAND AND ASSESSMENT OF THE RESULTS

SINFONIA
(Smart INitiative of cities Fully cOmmitted to iNvest in Advanced large-scaled energy solutions)

In the "Smart City" EU project SINFONIA (FP7), the core task was to transform selected quarters in the two cities of Innsbruck and Bolzano in an energetically sustainable way. In Innsbruck, the focus was on a number of large apartment buildings or building ensembles with a (heated) area of over 46 000 m² (TFA) as well as three schools. Their ambitious energy refurbishments were planned, calculated in advance and evaluated using measurement technology as part of the project. The University of Innsbruck (AB Energieeffizientes Bauen) carried out measurements of consumption and comfort, etc. in the buildings mentioned above. The consumption data for heating reflect the current stage of refurbishment.

The Passive House Institute carried out quality assurance during the planning phase and during the renovation. For the SINFONIA projects, the PHPP was generally used to asses in detail the condition of the old building, the current renovation step and the final state of the renovation. In the report the measured data, after preparation, are compared with the PHPP's projections.

On average, the refurbishments reduce the heating consumption values for useful heat to only 31.8 kWh/(m²a). For the buildings the realised savings are about 3 182 000 kWh per year (3.2 GWh/a). This corresponds to a saving of about 77% compared to the condition of the old building before the renovations.

With a well-maintained and complete PHPP, reliable predictions can already be made during the planning phase. In these projects, the statistical uncertainties are higher than when measuring the entire building due to the limited scope of measurement or the random individual measurement of flats.

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