Energy refurbishment of historic districts. A techno-economic and environmental analysis of a case study
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Dateien
[Conference Paper]
Autor:innen
Autor:in (Körperschaft)
Publikationsdatum
11.10.2016
Typ der Arbeit
Studiengang
Typ
04 - Beitrag Sammelband oder Konferenzschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Advanced Building Skins
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
Ausgabe / Nummer
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Advanced Building Skins
Verlagsort / Veranstaltungsort
Bern
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
A techno-economic and environmental analysis of proposed energetic refurbishment measures combined with energy supply variants for a historic district in Switzerland (303 entities; 64’546 m2 energy reference area (AE)) is given. The economic evaluation is based on the Net Present Value (NPV) method and the environmental impact is quantified in “eco-points” (German: “Umweltbelastungspunkte” (UBP)) and equivalent CO2 emissions. Data for the analysis is provided by the Swiss building certification (German: “Gebäudeenergieausweis der Kantone” (GEAK)) and secondary literature. A total of three variants, V I through V III is analysed.
The results show how current limit values for heating demand can be met with energetic refurbishment measures (including aerogel-super-insulation materials) which conform to requirements of the regional monument protection. It is found that a local heat distribution system based on a Brine/Water Heat Pump (B/W HP) (V I) can reduce the environmental impact for heating, hot water, ventilation, auxiliary energy (HWVA) from currently 1.8 tons CO2 eq per capita and annum (p.c.a.) (1.5 Million UBP’s p.c.a.) for the fossil fuel based system to 118 kg CO2 eq p.c.a. (325 thousand UBP’s p.c.a.). The environmental impact of a central wood chip plant (Combined heat and power (CHP)) in V II or a district heating based system in V III is slightly higher than in V I. Negative NPV (for a 30 years’ time frame) is found for all three mentioned energy supply systems in combination with energetic refurbishment measures (V I: -147.- CHF/m2 AE, V II: -125.- CHF/m2 AE, V III: -98.- CHF/m2 AE). However, it can be shown that reducing the energetic refurbishment costs by one third leads to a positive NPV for all three variants mentioned. Furthermore, the NPV-results do not differ significantly between the variants and should therefore not be the sole basis for decision-making.
A sensitivity analysis shows a great impact of materials’ lifetime on the NPV. Therefore, reliable estimates for e.g. aerogel-super-insulation materials are important data for a NPV evaluation. Furthermore, the environmental impact was calculated for HWVA, only. This system boundary should be extended to domestic electricity consumption, embodied energy in insulation materials and PV in further research.
Keywords: aerogel-super-insulation, historic district, energetic refurbishment, energy supply variants, sustainability assessment
Schlagwörter
energy refurbishment, historic district, techno-economic analysis, environmental analysis
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
10.10.2016
Enddatum der Konferenz
11.10.2016
Datum der letzten Prüfung
ISBN
978-3-98120539-8
ISSN
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Lizenz
Zitation
MENN, Claudio und Achim GEISSLER, 2016. Energy refurbishment of historic districts. A techno-economic and environmental analysis of a case study. In: Advanced Building Skins. Bern: Advanced Building Skins. 11 Oktober 2016. ISBN 978-3-98120539-8. Verfügbar unter: https://doi.org/10.26041/fhnw-786