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NZEB - innovation through simplicity


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David Fitzpatrick and Chris Croly present on Innovation through Simplicity at the NZEB session at the SEAI Energy Show.

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NZEB - innovation through simplicity

  1. 1. Innovation through Simplicity David Fitzpatrick Chris Croly
  2. 2. ‘The Courtyard School’ • Clear and simple approach to school design • Challenging site • Revised DoES room layouts and areas • TGD part L 2017 • NZEB
  3. 3. St Mary’s Secondary School, Ballina • 650 pupil all girls post primary school • Gross internal floor area 6,940 m2 • Project Status: Stage 2b
  4. 4. Existing School Town Centre Proposed School Church Special Needs School Primary School Convent Location • Outskirts of Ballina town, Co Mayo
  5. 5. Site • Challenging site • Elevated and particularly exposed • Topography • Drainage restrictions Church Special Needs School Residential Development Proposed School Site Town Centre Primary School Convent Existing School
  6. 6. Topography • Significant level change across the site • 6.1m increase in level from site entrance to top of hill • 8.8m fall away from top of hill to eastern boundary line +6.1m+0m -2.7m +3.3m +0.5m Top of the hill
  7. 7. Drainage Drainage Route Optimum building position Drainage only possible with pumped solution • Minimum falls for gravity drainage restricted building position within the site to the top of the hill
  8. 8. Boundary Conditions • Proximity to houses and Special Needs School • Level difference at boundary to houses +3.3m +0.5m Residential Development Optimum building position Special Needs School
  9. 9. • Simple building form • Responds to context • Shelter from prevailing winds • Excellent daylight and ventilation Design Approach Views Church Special Needs School Residential Development Primary School Convent Town Centre Views
  10. 10. • L-Shaped Classroom Wing Classroom Wing ‘Flexible Wing’ Views Sheltered Courtyard • ‘Flexible Wing’ • Courtyard sheltered by building form The Courtyard School
  11. 11. • Clear and legible school design • Inevitability to its organisation • Classrooms positioned to optimise adjacencies and orientation GP Room Library Multi-use Hall Technology Art Science Home Economics Music Service Multimedia / Graphics FlexClass FlexClass FitnessChanging Sheltered Courtyard Simple is good…
  12. 12. GP Room Library Multi-use Hall • Combining the large shared spaces to create a highly flexible and adaptable wing for the school • Multi-use hall • General purpose room, • Fitness suite • Library Fitness ‘Flexible Wing’ More than the sum of their parts…
  13. 13. • A suite of large interconnecting shared spaces • Designed to accommodate functions such as examinations, exhibitions, concerts, whole school assembly etc The ‘Flexible Wing’
  14. 14. • Revised DoES classroom layouts • Improve the quality of teaching spaces • Cater for different modes of learning • Modular approach to classroom sizes Better Classrooms
  15. 15. Corridor Corridor Poor Daylight & ventilation Revised Previous 7.65m • Issues with deep plan classrooms have been addressed • Improved natural daylight and ventilation throughout • Additional circulation area Better Classrooms
  16. 16. • Net to gross area: 20% • Internal Division: 4.2% • Circulation (inc stairs): 15.7% • Efficient double loaded corridors • Locker zones to increase effective width of circulation routes • More generous at entrances • Social areas and voids increase sense of space Ground Floor Circulation Area Efficient Circulation
  17. 17. • Designed purposeful spaces • Encourage socialising and informal learning Every space is a learning space ‘Social Space Nodes’
  18. 18. • Staff areas and pastoral offices are strategically positioned to provide passive supervision Passive Supervision Toilet Social Area
  19. 19. • Toilet layout designed to discourage antisocial behaviour and bullying • Washroom space kept to a minimum • Handwashing facilities to be visible • Full height cubicles An bhfuil cead agam dul go dtí an leithreas más é do thoil é..
  20. 20. Natural Daylight and Ventilation • The school has been designed to optimise natural daylight and ventilation • A key driver early in the design process • Integrated BDP approach to design • Modular windows • Calculation tool utilised to verify and tune facade
  21. 21. • Nearly Zero Energy Buildings • Introduced into the 2010 revised version of the EPBD (Energy Performance of Buildings Directive) • A building with very good energy performance, with a significant proportion of that energy achieved from on-site, or closely sourced renewable energies • All public buildings built after 31st December 2018 need to be built to NZEB standard • To comply with the NZEB requirement, the Irish Government has issued the revised TGD Part L What is NZEB?
  22. 22. • NZEB requirements were not know at outset of this project and the design pre-empted their introduction • Upgraded building fabric performance • Led lighting utilised throughout • Photovoltaic Panels • 10% of the regulated schools energy from on-site renewable sources NZEB Requirements
  23. 23. Building Fabric – U Values and Airtightness • Designed to meet the DoES backstop values as outlined in TGD-033 • Roof: 0.16 W/m2K • Walls: 0.21 W/m2K • Floors 0.21 W/m2K • Windows: 1.2 W/m2K (Project specific, increased at Stage 1 due to exposed nature of site) • The building shall achieve an air permeability of less than 3m3 /(h.m2)@50Pa
  24. 24. Building Fabric - Roof • Single ply membrane roof with 8 degree pitch • Achieve backstop U Value: 0.21 W/m2K • Address issues associated with metal roofs • Improved air tightness performance • Improved rain impact noise performance
  25. 25. Building Fabric - Walls • Blockwork cavity wall with render finish • Achieve backstop U Value: 0.21 W/m2K • Standard cavity wall construction and cavity size
  26. 26. Building Fabric - Floors • Insitu concrete slab • Achieve backstop U Value: 0.21 W/m2K • Standard floor slab construction
  27. 27. Building Fabric - Windows • Thermally broken aluminium framed windows • Argon filled double glazed units • U value: 1.2 W/m2K (Project specific) • (DoES backstop u value is 1.6 W/m2K) • Increased at Stage 1 due to exposed nature of site
  28. 28. The PV Canopy • School specific design solution • Particularly exposed site • Placement on roof would require maintenance access • PV incorporated into covered walkway • Not over-shadowed • Secured within the courtyard
  29. 29. NZEB Compliance • No significant change required other than PV • Insulation already almost at backstop values • Air testing in schools for over ten years • LED lighting was a technology driven change LED isn’t in the reference building providing a head start in compliance for all buildings
  30. 30. NZEB is a minimum requirement not a target • 100% Renewable energy is possible and economically sound if net metering was allowable. Otherwise >10% generation results in significant unpaid export. A national view is required for future Part L revisions not a building specific approach. Net metering – or renewable credit purchase scheme for challenging city centre buildings (10% target is achievable for almost all existing buildings). • Real energy is important not just the SBEM result 10%+ 100%
  31. 31. • 50% Computing • 50% Vampires • Adding insulation has almost no effect 1.8% change from backstop to reference values with no payback Part F fabric protection prevents further improvements in infiltration – end of the line for infiltration improvements A nationwide rather than school by school approach to thin client computing and cloud servers could more than halve computing energy
  32. 32. NZEB Is Exceeded • NZEB did assist in the argument for HRV but air quality is an adequate argument alone • As a naturally cooled office with HRV the renewable target is easily exceeded • 20% Renewable energy provided, twice that required by NZEB
  33. 33. • All about computing • 20% Vampires – more difficult to kill due to the research and enterprise nature of the building requiring intermittent usage
  34. 34. Conclusions • NZEB is the starting point. “Near Zero” is still a long way from Zero. • Good design targets NZEB+ • Address real energy not just that picked up by NZEB • The largest potential for future savings comes from national collaboration rather than treating buildings as isolated projects • Computing energy strategies are required as computing now has a larger effect than Part L on actual building energy emissions
  35. 35.