EXEMPLARY PROJECTS IN THE BRUSSELS CAPITAL REGION: INITIATING A LONG TERM TREND STIMULATION OF RENOVATION OF VERY LOW ENERGY HOUSING (<30KWH/M²AN)

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RENOVATION OF VERY LOW ENERGY HOUSING (<30KWH/M²AN)

1 EXEMPLARY PROJECTS IN THE BRUSSELS CAPITAL REGION: INITIATING A LONG TERM TREND STIMULATION OF RENOVATION OF VERY LOW ENERGY HOUSING (<30KWH/M²AN) Caroline JADOUL Bruxelles Environnement Leefmilieu Brussel

2 Contest: «EXEMPLARY BUILDINGS: ENERGY AND ECO- CONSTRUCTION» 2007 in Brussels ( targets performant : energy + environnement (indicative Technically replicable financially supportable Regional support of 90 /m² project owner et 10 /m² conceptor Built within 3 years (4 years) challenge for the market to go as far as possible!

3 PROCEDURE Personalized technical guidance Introduction of application Analyse of the application by neutral expert Classification of projects by jury Final decision: government Technical support and control till end of construction Monitoring for 5 years Publication of the projects

4 Selection criteria

2007 et 2008 76 selected projects 13.4 M subventions 205.000 m² = 1/6 constructed building in Brussels - 160 passive dwellings (21.632 m²) - 394 low energy dwellings (41.104 m²) - 22.

5 2007 et selected projects 13.4 M subventions m² = 1/6 constructed building in Brussels passive dwellings ( m²) low energy dwellings ( m²) m² passive service buildings - Reduction of energy needs E : - 75% : 60 participating projects Savings: tons CO2 /year = tep/year Initiating a long term trend

6 ENERGY: housing renovation Average consumption in Brussels : 150 kwh/m².an Target contest : kwh/m².an kwh/m².an Challenge achieved for all kind of dwellings: Typical1-family attached house Collective housing 11-storey building of 95 housing units projects with patrimonial restrictions renovation to passivehouse standard

20 projects of housing renovation = 25.000m² = saving of 4.9 million kwh/an, = 420 tep ou 1 T CO2/an (only calculated on BNE heating) = 65.

7 20 projects of housing renovation = m² = saving of 4.9 million kwh/an, = 420 tep ou 1 T CO2/an (only calculated on BNE heating) = m² new buildings in passivehouse standard in stead of regular standard (considered at 90 kwh/m².an)! Very hugh impact! big potential in Brussels.

8 BNE heating before and after renovation

9 the RECIPE for very low energy renovation Asset: party walls, compacity Constraints: predetermined orientation, patrimonial value (frontage) avant), building line,

10 30 kwh/m².an frontage insulation 95% of the cases: insulation from inside: New technical questions! materials? Resolution of thermal bridges: party walls, wooden floors in frontwall, Thermal reactions of outside materials? Calculation of the coupled heat and moisture transfer in building components : Wufi Inside patrimonial value!? mouldings, panelling, Maison av. Rubens 92, à Schaerbeek

11 30 kwh/m².an mechanical ventilation with heat recovery Target airtightness: 1.5 vol/h at 50 Pa Constraints: entrance door, old pasters, wooden beams, cellars, panelling, existing frames with patrimonial value, Creative integration of ventilation shafts (maison av. Rubens) Return form field experience will be very precious

ECO-CONSTRUCTION : integrated concept ENERGY: insulation, airtightness, ventilation, renewables, lightning, But also Relation to TERRITORY : buggy room, bikes, biodiversity in garden, façade,.

12 ECO-CONSTRUCTION : integrated concept ENERGY: insulation, airtightness, ventilation, renewables, lightning, But also Relation to TERRITORY : buggy room, bikes, biodiversity in garden, façade,. Study of MATERIALS : ecological building materials (NIBE), waste management, recycling, architectural flexibility WATER management : pression reductors, recycling and infiltration of rainwater, green roofs, COMFORT and HEALTH : natural paintings, noise, filters on ventilation,

13 EXAMPLE of AMBITIOUS project: maison HUBERTI Renovation in 3 steps: own investments Phase 1 : < 60 kwh/m².an primes «basse énergie» Phase 2 : < 30 kwh/m².an subvention «bâtiment exemplaire» Phase 3 : < 15 kwh/m².an

14 EXAMPLE of AMBITIOUS project : block FLORAIR facelift Exemplary building 220 kwh/m².an 26 kwh/m².an insulation façades, replacement of windows 2 ventilation systems: syst D (extreme appartments), syst C+ for center Study of thermal bridges No transfer of the occupiers!

15 FINANCIAL SUPPORT Global renovations, to do simultaneously with other works (plumbing, electricity, finishing, ), then, additional cost is justified and profitable. Incentives!! Example: Droguerie chaussée de Forest

16 Financial study: Droguerie chsée de Forest 22 kwh/m².an, solar panels, ground-coupled heat exchanger

18 Return on investment + tax reduction!! To not do it, would not be a miscalculation

19 REFERENCE «VERT BRUXELLES: ARCHITECTURES A SUIVRE»

20 CONCLUSION Very low energy housing renovation in Brussels: Technically possible Financially interesting Needs professional guidance during conception and building phases Field feedback and standardisation of solutions will make the challenge more reachable With about 100 exemplary buidings: extraordinary source of information for further technical and financial studies (our next step )

Row House Henz-Noirfalise in Eupen, Belgium

Row House Henz-Noirfalise in Eupen, Belgium PROJECT SUMMARY Transforming a 19th century row house into a Passive House SPECIAL FEATURES Inside insulation of the facade ARCHITECT Fhw architectes scprl www.fhw.be