The role of building renovation for urban energy efficiency:

Transcription

1 MA 20 Vienna, The role of building renovation for urban energy efficiency: Thomas Kreitmayer Vienna City Administration

2 CONTENT Spotlight on Vienna Municipal Department 20 energy planning Energy in Vienna energy consumption of buildings climate relevance of the building sector Viennese approaches increase efficiency of building sector legal framework for new development & renovation Showcase projects 2

3 Vienna offers highest quality of living worldwide Mercer 2018: 9 times in succession 1st place Smart City Ranking 2015: 1st place UN/State of the World Cities 2013: 1st place MA 20/Fürthner

4 A capital in the heart of Europe 1989: 1.48 mio. inhabitants 2016: 1.87 mio. inhabitants 2025: ~ 2 mio. inhabitants 50% migration background 181 nationalities Demographic growth in Vienna ,800,000 1,600,000 1,400,000

5 MA 20 ENERGY PLANNING Renewable Energy Sources (RES) Integrated energy & spatial planning Energy efficiency & energy technologies How to make the city more efficient? How to increase the share of RES in the city? How to design a future-proof, climate-friendly energy supply? Where to use which energy source best? 5 MA 20/Duchon

6 VIENNESE ENERGY FLOW CHART 6

7 VIENNESE ENERGY FLOW CHART 7 >1/3 = buildings

8 ENERGY CONSUMPTION OF THE BUILDINGS Energy consumption of private households by energy source Vienna, Electrical power District heating Combustible waste RES Gas Oil Coal Population Vienna Falling slightly in the recent years 90% of space heating energy comes form Gas & district heating

9 AGE OF THE BUILDING STOCK - CONSTRUCTION PERIODS APPARTMENTS SORTED BY CONSTRUCTION PERIOD % 9 Appartments total: ~ Built before 1919: ~ % before % Buildings total: ~ Built before 1919: ~ > 50% inner city districts % % %

10 VIENNA IS A BUILT CITY Large historical building stock 10 Designated protection zones for historic areas of the city Special challenge in terms of energy efficiency MA 20/Kreitmayer

11 PROTECTION ZONES 11

12 VIENNESE STRATEGIES FOR URBAN ENERGY EFFICIENCY Set minimum legal standards for new buildings as well as for renovation Funding of significantly more ambitious measures Especially concerning quality of building envelope and the energy system Lead by example Showcase renovation Support of pilot projects 12

13 LEGAL FRAMEWORK CONDITIONS Building regulations (Bauordnung Wien) Viennese Building-Subvention and House- Renovation Law (WWFSG 1989) 13 Highest efficiency standards NZEB Forcing of highly-efficient alternative systems for energy supply Subsidies for RES & thermal renovation of residential units

14 SUSTAINABILITY AND AFFORDABILITY Is energy efficient building profitable? It is often said that efficiency measures are uneconomic 14 Studies show: investments in efficiency can lead to significantly lower overall building costs BOKU study about passive houses: Much more energy efficient Much more comfort Very little to no additional costs compared to conventinoal buildings

15 SECOND EDUCATION CAMPUS ASPERN 15 Mattweis Architekturmodellbau

16 ÖJAB-GREENHOUSE STUDENT HOSTEL IN ASPERN 16 Passive House Plus standard Building produces all needed energy itself PV > 200 kwp & 137 kwh battery-storage high thermal insulation, airtight building with controlled ventilation, etc.

17 PASSIVE HOUSE EBERLGASSE FIRST REFURBISHMENT OF AN EARLY DAYS BUILDING TO PH-STANDARD 17 General refurbishment Change of heating system from gas to RES Subsequent installation of a ground water heat pump Ventilation with heat recovery, in- & outdoor LED lighting, energy recovery from elevator

18 EARLY DAYS HOUSE KAISERSTRAßE GENERAL REFURBISHMENT & EXTENSION OF A LISTED BUILDUNG 18 Heating demand before: 121 kwh/m²a Heating demand after: kwh/m²a Annual energy consumption reduced by 80 % Inside insulation, inside lying passive-house windows

19 VIENNESE SHOWCASE MGG apartments (partly subsidized) Thermal activation of building structure Heating & cooling with heat pump sytem Energy demand cover by > 80 % RES on-site Energy costs less than half (comparing conventional systems) 19

20 Thank you for your attention Thomas Kreitmayer Energy Efficiency and Energy Technologies Vienna City Administration Municipal Department Wien, Rathausstraße Tel.: (+43 1) Web: