1. Elisabeth Kirscht 1 WP 4 Hannover Demonstration objects - Results - Elisabeth Kirscht Hannover Climate Protection Unit Gundlach 1 st July 2011

2. Elisabeth Kirscht 2 Highlights Concerto/act2 Hannover 48 4 3 Above all: 7 other objects with renewable energy 1 st July 2011

3. Vision at project start 3 Integrative modernisation of buildings on a large scale Focus on multi-family dwellings Motivation of private house owners Modernisation focus on building envelop Using passivhouse components Centralisation of heating systems Using renewable energy where possible Modernisation standards for public buildings Instruments for financial and advice support Quality assurance 1 st July 2011 Elisabeth Kirscht

4. Multiple-family dwellings Demo objects Number of buildings Number of apartments Total heated useable area Final energy demand Renewable energy Multiple- family dwellings 30 New build standard 3 Kronsbergstandard 257 24 15.230 m² 1.600 m² 65 -71 kWh/m² 62 kWh/m² District heating of biomass 1.470 MWh/a (644 kW) 8 New build standard 724.906 m²63 -73 kWh/m²Wood fuel heating 150 kW 1 Kronsbergstandard 11575 m²62 kWh/m² (geothermic heat pump) 1 st July 2011 4 Elisabeth Kirscht

5. Multiple-family dwellings Demo objects Number of buildings Number of apartments Total heated useable area Final energy demand Renewable energy Multiple- family dwellings 30 New build standard 3 Kronsbergstandard 257 24 15.230 m² 1.600 m² 65 -71 kWh/m² 62 kWh/m² District heating of biomass 1.470 MWh/a (644 kW) 8 New build standard 724.906 m²63 -73 kWh/m²Wood fuel heating 150 kW 1 Kronsbergstandard 11575 m²62 kWh/m² (geothermic heat pump) 1 st July 2011 5 Elisabeth Kirscht Total: 42 Multiple family dwellings 364 apartments 22.311 m² useable area

6. Multiple-family dwellings – costs - 1 st July 2011 Elisabeth Kirscht retrofitting3,5 Mio €174€/m²51% total costs: 7 Mio € 345 €/m² heating system2,1 Mio €103€/m²30% planning1,2 Mio €58€/m²17% quality assurance0,2 Mio €10€/m²3% 6

7. Multiple-family dwellings – costs - 1 st July 2011 Elisabeth Kirscht retrofitting3,5 Mio €174€/m²51% total costs: 7 Mio € 345 €/m² heating system2,1 Mio €103€/m²30% planning1,2 Mio €58€/m²17% quality assurance0,2 Mio €10€/m²3% Concerto/act2 760.000 € 46% retrofitting 280.000 €17% heating systems 480.000 €29% proKlima300.000 €18% Total support: 1,65 Mio € 24 % kfW, national support590.000 €36% total support:1.650.000 € Support: 7

8. Elisabeth Kirscht 8 Upper limit for investment For building components with difficult thermal bridges such as these cantilevered balcony base plates, the structural assessment was the determining factor for carrying out such renovation details or not. 1 st July 2011

9. 9 Quality of the building envelope Multiple family dwellings Statutory savings: 55% Actual savings: 70% Elisabeth Kirscht 1 st July 2011

10. Primary energy demand Multiple family dwellings Actual savings 92 % 10 Elisabeth Kirscht 1 st July 2011

11. 8th act2 Steering Committee, 01.07.2011 Status report monitoring: results of demonstration objects in Hannover Arndt Weidenhausen, proKlima

12. 8th act2 Steering Committee, 01.07.2011 12 1. Housing companies retrofitting of buildings in Vahrenwald Arndt Weidenhausen, proKlima

13. 8th act2 Steering Committee, 01.07.2011 13 Transmission losses: legal requirements and Concerto standard different standards of the two housing companies Arndt Weidenhausen, proKlima

14. 8th act2 Steering Committee, 01.07.2011 14 Energy consumption in Vahrenwald reduction of final energy consumption from 129...185 kWh/m²a to 71...97 kWh/m²a Arndt Weidenhausen, proKlima

15. 8th act2 Steering Committee, 01.07.2011 15 Energy savings in Vahrenwald final energy consumption savings between 37 and 54 % (52.. 68 % without DHW) Arndt Weidenhausen, proKlima

16. 8th act2 Steering Committee, 01.07.2011 16 Energy consumption over the years different development of energy consumption over the years Ernst-Eiselenstr. 2-8 Hirtenweg Arndt Weidenhausen, proKlima

17. 8th act2 Steering Committee, 01.07.2011 17 Résumé buildings of housing companies Heating energy savings of 50 -70% are nearly as high as predicted and much better compared to usual retrofits. Heating consumption reduces from 140 kWh => 45 – 70 kWh / m² and year. More ambitious measures in Gundlach buildings lead to better results (10% higher savings) than in the objects of Spar- und Bauverein Increasing importance of DHW: 10-15 % (before) => 30-40 % of total energy consumption The legal requirements of retrofitting have been falled below 30%. The new buidling requirements have been fullfilled in all buildings (CONCERTO-Standard). The housing companies gained experiences with high energy standards and are prepared for the more strict requirements: complete retrofitting in one step high living comfort and low energy costs for tenants Arndt Weidenhausen, proKlima

18. 18 Main instruments multiple-family dwellings Determination of energy standards Comprehensive energy planning Tenants information and support during implementation Impact on rental fee (agreement tenants and association) Quality assurance Elisabeth Kirscht 1 st July 2011

19. 19 Accompanying measures Qualification measures for crafts and planners Framework requirements for quality assurance Information networks and campaigns Elisabeth Kirscht Target GmbH 1 st July 2011

20. Private house owners Demo objects Number of buildings Number of apartments Total heated useable area Final energy demand Renewable energy Buildings of private house- owners 4 Detached houses (1 Kronsbergstandard) 6 Multiple-family dwellings 343.328 m²72 kWh/m² (62 kWh/m²) 4 Solar collectors 2 Wood pellet heating 51 m² 30 kW 20 Elisabeth Kirscht 1 st July 2011

21. Private house owners 21 Elisabeth Kirscht 1 st July 2011 In face of a great number of our activities it was difficult to get through to the privat owners. Only one aim was possible: Motivation of owners, who had already decided on modernisation of their buildings, to realise higher energetic standards. Important help: information and advice by the Energieassistent

22. Elisabeth Kirscht 22 Concerto – Kronsbergstandard Final demand for space heating: 35,8 kWh/m² (< 55 kWh/m²) Private house owner Bergkammstraße in Ahlem 1 st July 2011

23. Elisabeth Kirscht 23 Concerto – Kronsbergstandard Final demand for space heating: 35,8 kWh/m² (< 55 kWh/m²) Achieved standard compared to national regulations for new: buildings: building envelope H T ‘ : 30 % superior primary energy demand: 45 % superior Private house owner Bergkammstraße in Ahlem 1 st July 2011

24. Elisabeth Kirscht 24 Concerto – Kronsbergstandard Final demand for space heating: 35,8 kWh/m² (< 55 kWh/m²) Achieved standard compared to national regulations for new: buildings: building envelope H T ‘ : 30 % superior primary energy demand: 45 % superior Private house owner Bergkammstraße in Ahlem 1 st July 2011 Total costs: 118.500 € 40 % for retrofitting Total support: 26.000 €, 22 % (4.452 € Concerto)

25. 8th act2 Steering Committee, 01.07.2011 25 Passivhouse components insulation walls: 18 cm roof: 20 cm cellar: 6 cm windows Uw: 1,1 W/m²K minimised thermal bridges air changes/hr: n 50 = 1,4 hr -1 ventilation system with heat recovery 2. Private owner retrofit of building in Ahlem Concerto – Kronsbergstandard Final demand for space heating: 35,8 kWh/m² (< 55 kWh/m²) Achieved standard (calculated) compared to national regulations : building envelope H T ‘ : 30 % superior primary energy demand: 45 % superior Heating system: Gas boiler with condensing boiler technology and solar collectors (31,6%)

26. 8th act2 Steering Committee, 01.07.2011 26 retrofit of building in Ahlem first results: energy consumption 68 % final energy savings, 24 % final energy = solar (partly) unoccupied partly unoccupied retrofitted (without roof) completely retrofitted Arndt Weidenhausen, proKlima

27. 8th act2 Steering Committee, 01.07.2011 27 Bergkammstraße gas consumption and solar gains Arndt Weidenhausen, proKlima

28. 28 Main instruments private house owners Initial energy advice (door to door campaign) Independent information and technical advice for house owners (high qualified energy assistant) Determination of energy standards Support for single components better than for complex retrofitting, because they are mostly common Quality assurance financial support for the measures it selves for the energy assistant for quality assurance Elisabeth Kirscht 1 st July 2011

29. Demo objects Number of buildingsStandard Total heated useable area Final energy demand Renewable energy Public buildings 3 school buildings Halving final energy demand 8.532 m²100 – 124 kWh/m² 2 PV42 kW P 4 municipal buildings Wood fuel heating810 kW swimming pool Solar collector1.800 m² 29 Public buildings Elisabeth Kirscht 1 st July 2011

30. 30 Concerto/act2 School building retrofitting saving: 75% saving: 61% calculated saving: 75% calculated saving: 61% Elisabeth Kirscht 1 st July 2011

31. 31 Open air swimming pool absorber area of 1.800 m² Total swimming pool surface 3.200 m² Total swimming pool volume: 6.800 m³ In operation since May 2007 Public buildings Lister Bad 1 st July 2011 Elisabeth Kirscht

32. 32 8th act2 Steering Committee 01.07.2011 3. Lister Bad public swimmingpool Key data absorber area of 1.800 m² In operation since May 2007 242 - 314 kWh/m²a solar system output 32 - 49% solar fraction Arndt Weidenhausen, proKlima

33. 8th act2 Steering Committee, 01.07.2011 33 Lister Bad absorber area collecting solar radiation Arndt Weidenhausen, proKlima

34. 8th act2 Steering Committee, 01.07.2011 34 Lister Bad Results of operation Arndt Weidenhausen, proKlima

35. 8th act2 Steering Committee, 01.07.2011 35 Lister Bad Reduction of Arndt Weidenhausen, proKlima

36. 8th act2 Steering Committee, 01.07.2011 36 Input-Output-Controller for monitoring the functional capability and the solar yield Display module for visualisation of pool temperature, solar energy gain and CO2-savings Lister Bad Additional installations Arndt Weidenhausen, proKlima

37. 8th act2 Steering Committee, 01.07.2011 37 Thank you for your attention! www.proklima-hannover.de proKlima GbR Arndt Weidenhausen Glockseestr. 33 30169 Hannover Fon: ++49 511 430 2796 Fax: ++49 511 430 941 2796 Arndt Weidenhausen, proKlima

38. 38 Public buildings and enercity Elisabeth Kirscht Demoobjects Renewable energy Local utility enercity 1 PV75 kW wood energy centre 1 st July 2011

39. Summery of experiences 39 Vision Focus on multi-family dwellings Motivation of private house owners Modernisation focus on building envelop Using passivhouse components Centralisation of heating systems Using renewable energy where possible Modernisation standards for public buildings Instruments for financial and advice support Quality assurance Experiences successful implemented very difficult, possible: only motivation to more very important for efficient use of renewables successful implemented, apart from ventilation systems Questions by Monitoring data about distributing losses successful implemented 30 % under concerto new build standard can be achieved with refurbishment subsidises are essential, particular in good coordination between local, regional and national funds, essential; subsidies are necessary 1 st July 2011 Elisabeth Kirscht

40. 40 Lessons learnt Barriers are not technical Solutions are information and communication, high qualified advices and financial support Elisabeth Kirscht 1 st July 2011

41. Elisabeth Kirscht 41 1 st July 2011 Thank you! before after

42. 8th act2 Steering Committee, 01.07.2011 42 Results from non residential buildings Arndt Weidenhausen, proKlima

43. 8th act2 Steering Committee, 01.07.2011 43 Input-Output-Diagramm for a period in 2007 Results from non residential buildings Arndt Weidenhausen, proKlima

44. 8th act2 Steering Committee, 01.07.2011 44 Results from non residential buildings Quelle Fotos: Peter Pärisch, Till Bethe, Rainer Tepe Arndt Weidenhausen, proKlima

45. 8th act2 Steering Committee, 01.07.2011 45 Residential buildings in Hannover retrofitting of multi-occupancy buildings of housing companies 42 buildings of 3 housing companies with 364 apartments with ca. 22.300 m² energetic renovation to new building standard or better energy supply: district heating from biomass, wood pellets or heat pump retrofitting of residential buildings of private owners 10 buildings with 34 flats (ca. 3.330 m²) energetic renovation to new building standard or better energy supply: district heating from biomass or wood pellets partly solar energy use (PV or collectors) Arndt Weidenhausen, proKlima

46. 8th act2 Steering Committee, 01.07.2011 46 Non-residential buildings in Hannover retrofitting of single objects of the City of Hannover 6 buildings (schools, depot, plant nursery, chapel) partly wood heating partly insulation measures 1 PV plant public swimming pool Solar collectors for pool water projects of enercity “Holzenergiezentrum”: sale of and marketing for energy wood products (wood logs, pellets and chips) PV plant on central warehouse Arndt Weidenhausen, proKlima

47. 8th act2 Steering Committee, 01.07.2011 47 Energy use in different flats great differences (factor 2... >10) between flats mainly because of user behaviour Arndt Weidenhausen, proKlima

48. 8th act2 Steering Committee, 01.07.2011 48 Private owner retrofit of building in Ahlem Energetic measures before retrofittingafter retrofitting exterior wallsmassive pumice walls U = 1,5 W/m²K 18 cm (032) insulation U = 0,16 W/m²K roofwooden ceiling, U = 1,5 W/m²K30 cm insulation (035), U = 0,12 W/m²K cellarconcrete ceiling with timber piling U = 1,35 W/m²K piling replaced by screed and insulation U = 0,38 W/m²K windowsdouble glazing, U =2,8 W/m²Ktriple glazing, U= 1,05 W/m²K ventilationwindowsventilation system with heat recovery, n 50 = 1,48 h -1 heating, DHWgas boiler, DHW = electricgas condensing boiler, 12 m² solar collector Arndt Weidenhausen, proKlima