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Author(s):	Stocker, Emanuel; Tschurtschenthaler , Martin
Title:
Abstract:	Dieser Artikel befasst sich mit der Thematik der kostenoptimalen energetischen Sanierung am Beispiel von typischen Wohngebäuden in Österreich. Das Kostenoptimum ergibt sich aus den jeweiligen Maßnahmen zur Reduzierung des Energiebedarfs und den sich daraus ergebenden Energiekosten. Die Berechnung erfolgte auf der Grundlage der Kapitalwertmethode. Die Berechnungen wurden mit Hilfe eines statistischen Programms anhand von Szenarien durchgeführt, wodurch es möglich ist, eine willkürliche Auswahl von Sanierungsmaßnahmen berechnen und darstellen zu lassen. Aus der Untersuchung geht hervor, dass das kostenoptimale Niveau bei einem Heizwärmebedarf von ca. 30-40 kWh/m2 BGF p.a. liegt. Da die Eingangsparameter der Berechnung vielfach auf zukunftsbasierten Annahmen basieren, wurde abschließend eine Sensitivitätsanalyse durchgeführt, wodurch die Einflüsse erhoben und dargestellt werden konnten. Daraus geht hervor, dass diese jeweils einen hohen Einfluss auf das Ergebnis haben und deshalb sorgfältig auszuwählen sind. In search of the cost optimised energy-saving renovation - evaluation of typical residential buildings in Austria. This paper represents a study of cost-optimal building renovation arrangements regarding the heating energy performance. The study is based on typically residential buildings with different building ages and therefore different constructions. The calculation method is compiled on standard energy demand and the net present value method. The results show that the cost-optimal performance is between a heating energy demand of 30 to 40 kWh/m2 GFA p.a. The building age with the different construction qualities has a high effect on the results of the net present value. Also the investment costs of the different building renovation arrangements show a high effect on the results concerning the cost optimal renovation measurements. Where the insulation thicknesses of the envelope have proposed thicknesses of about 14-18 cm the windows only reach the highest U-Value of 1.2 because of the higher investment costs. Furthermore the sensitivity analysis shows the high impact of the necessary input calculation parameters, like the energy price, the interest rate and the energy price variation. The study considers several ways which can improve the decisions about the renovation possibilities. These include not only the decision of the renovation but also the necessary arrangements, which could be integrated in the procurement.
Source:	Bauphysik 36 (2014), No. 3
Page/s:	152-158
Language of Publication:	German

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