Elisabeth Kirscht 1 WP 4 Hannover Demonstration objects - Results - Elisabeth Kirscht Hannover Climate Protection Unit Gundlach 1 st July 2011 Elisabeth Kirscht 2 Highlights Concerto/act2 Hannover Above all: 7 other objects with renewable energy 1 st July 2011 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 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 m m kWh/m 62 kWh/m District heating of biomass MWh/a (644 kW) 8 New build standard m kWh/mWood fuel heating 150 kW 1 Kronsbergstandard m62 kWh/m (geothermic heat pump) 1 st July Elisabeth Kirscht 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 m m kWh/m 62 kWh/m District heating of biomass MWh/a (644 kW) 8 New build standard m kWh/mWood fuel heating 150 kW 1 Kronsbergstandard m62 kWh/m (geothermic heat pump) 1 st July Elisabeth Kirscht Total: 42 Multiple family dwellings 364 apartments m useable area Multiple-family dwellings costs - 1 st July 2011 Elisabeth Kirscht retrofitting3,5 Mio 174/m51% total costs: 7 Mio 345 /m heating system2,1 Mio 103/m30% planning1,2 Mio 58/m17% quality assurance0,2 Mio 10/m3% 6 Multiple-family dwellings costs - 1 st July 2011 Elisabeth Kirscht retrofitting3,5 Mio 174/m51% total costs: 7 Mio 345 /m heating system2,1 Mio 103/m30% planning1,2 Mio 58/m17% quality assurance0,2 Mio 10/m3% Concerto/act 46% retrofitting 17% heating systems 29% proKlima 18% Total support: 1,65 Mio 24 % kfW, national support 36% total support: Support: 7 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 Quality of the building envelope Multiple family dwellings Statutory savings: 55% Actual savings: 70% Elisabeth Kirscht 1 st July 2011 Primary energy demand Multiple family dwellings Actual savings 92 % 10 Elisabeth Kirscht 1 st July 2011 8th act2 Steering Committee, Status report monitoring: results of demonstration objects in Hannover Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Housing companies retrofitting of buildings in Vahrenwald Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Transmission losses: legal requirements and Concerto standard different standards of the two housing companies Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Energy consumption in Vahrenwald reduction of final energy consumption from kWh/ma to kWh/ma Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Energy savings in Vahrenwald final energy consumption savings between 37 and 54 % ( % without DHW) Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Energy consumption over the years different development of energy consumption over the years Ernst-Eiselenstr. 2-8 Hirtenweg Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Rsum buildings of housing companies Heating energy savings of % are nearly as high as predicted and much better compared to usual retrofits. Heating consumption reduces from 140 kWh => 45 70 kWh / m 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: % (before) => % 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 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 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 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 m72 kWh/m (62 kWh/m) 4 Solar collectors 2 Wood pellet heating 51 m 30 kW 20 Elisabeth Kirscht 1 st July 2011 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 Elisabeth Kirscht 22 Concerto Kronsbergstandard Final demand for space heating: 35,8 kWh/m (< 55 kWh/m) Private house owner Bergkammstrae in Ahlem 1 st July 2011 Elisabeth Kirscht 23 Concerto Kronsbergstandard Final demand for space heating: 35,8 kWh/m (< 55 kWh/m) Achieved standard compared to national regulations for new: buildings: building envelope H T : 30 % superior primary energy demand: 45 % superior Private house owner Bergkammstrae in Ahlem 1 st July 2011 Elisabeth Kirscht 24 Concerto Kronsbergstandard Final demand for space heating: 35,8 kWh/m (< 55 kWh/m) Achieved standard compared to national regulations for new: buildings: building envelope H T : 30 % superior primary energy demand: 45 % superior Private house owner Bergkammstrae in Ahlem 1 st July 2011 Total costs: 40 % for retrofitting Total support: , 22 % (4.452 Concerto) 8th act2 Steering Committee, Passivhouse components insulation walls: 18 cm roof: 20 cm cellar: 6 cm windows Uw: 1,1 W/mK 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/m (< 55 kWh/m) 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%) 8th act2 Steering Committee, 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 8th act2 Steering Committee, Bergkammstrae gas consumption and solar gains Arndt Weidenhausen, proKlima 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 Demo objects Number of buildingsStandard Total heated useable area Final energy demand Renewable energy Public buildings 3 school buildings Halving final energy demand m100 124 kWh/m 2 PV42 kW P 4 municipal buildings Wood fuel heating810 kW swimming pool Solar collector1.800 m 29 Public buildings Elisabeth Kirscht 1 st July 2011 30 Concerto/act2 School building retrofitting saving: 75% saving: 61% calculated saving: 75% calculated saving: 61% Elisabeth Kirscht 1 st July 2011 31 Open air swimming pool absorber area of m Total swimming pool surface m Total swimming pool volume: m In operation since May 2007 Public buildings Lister Bad 1 st July 2011 Elisabeth Kirscht 32 8th act2 Steering Committee Lister Bad public swimmingpool Key data absorber area of m In operation since May kWh/ma solar system output % solar fraction Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Lister Bad absorber area collecting solar radiation Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Lister Bad Results of operation Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Lister Bad Reduction of Arndt Weidenhausen, proKlima 8th act2 Steering Committee, 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 8th act2 Steering Committee, Thank you for your attention!proKlima GbR Arndt Weidenhausen Glockseestr Hannover Fon: Fax: Arndt Weidenhausen, proKlima 38 Public buildings and enercity Elisabeth Kirscht Demoobjects Renewable energy Local utility enercity 1 PV75 kW wood energy centre 1 st July 2011 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 Lessons learnt Barriers are not technical Solutions are information and communication, high qualified advices and financial support Elisabeth Kirscht 1 st July 2011 Elisabeth Kirscht 41 1 st July 2011 Thank you! before after 8th act2 Steering Committee, Results from non residential buildings Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Input-Output-Diagramm for a period in 2007 Results from non residential buildings Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Results from non residential buildings Quelle Fotos: Peter Prisch, Till Bethe, Rainer Tepe Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Residential buildings in Hannover retrofitting of multi-occupancy buildings of housing companies 42 buildings of 3 housing companies with 364 apartments with ca m 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 m) 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 8th act2 Steering Committee, 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 8th act2 Steering Committee, Energy use in different flats great differences (factor 2... >10) between flats mainly because of user behaviour Arndt Weidenhausen, proKlima 8th act2 Steering Committee, Private owner retrofit of building in Ahlem Energetic measures before retrofittingafter retrofitting exterior wallsmassive pumice walls U = 1,5 W/mK 18 cm (032) insulation U = 0,16 W/mK roofwooden ceiling, U = 1,5 W/mK30 cm insulation (035), U = 0,12 W/mK cellarconcrete ceiling with timber piling U = 1,35 W/mK piling replaced by screed and insulation U = 0,38 W/mK windowsdouble glazing, U =2,8 W/mKtriple glazing, U= 1,05 W/mK ventilationwindowsventilation system with heat recovery, n 50 = 1,48 h -1 heating, DHWgas boiler, DHW = electricgas condensing boiler, 12 m solar collector Arndt Weidenhausen, proKlima