Energy in Schools by John Dolan

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Presentation delivered at the NZEB Public Sector workshop held in the Ashling Hotel, Dublin, January 2017.

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Energy in Schools by John Dolan

  1. 1. John Dolan BEng (Hons) M.Sc. Fire Eng H.Dip CEng MIEI Chartered Engineer Planning & Building Unit Tullamore www.energyineducation.ie. energy in schools Workshop on Public Sector NZEB Interim Specification Jan 2017
  2. 2. energy in schools • our energy policy & design approach • research projects informing approach to achieving new energy regulation targets • NZEB design priorities • proposed implementation of NZEB interim • proposed next steps
  3. 3. energy in schools • our energy policy & design approach • research projects informing approach to achieving new energy regulation targets • NZEB design priorities • proposed implementation of NZEB interim • proposed next steps
  4. 4. energy in school design • evolved from energy programme DART (Design, Awareness, Research & Technology) • informed by building unit professional & technical staff & external partnerships • driven by technical guidance documents • updated by continued energy research & development • disseminated by internal / external publications, conferences & annual report • specific project support from SEAI • acknowledged by national & international energy awards
  5. 5. maximising nature • passive solar design • daylighting • quality ventilation utilising technologies • enhanced insulation • air tightness • lighting & controls • heating & controls • water efficiency • I.T. & web based technologies
  6. 6. issues particular to schools • schools needs are different • different operational profiles • short hours of operation • technical ability on site • energy not core function • solutions must be robust energy usage in new primary schools 0 50 100 150 200 250 Schools built in 1980's Schools built in 1990's Schools, Best Practice Current school designs based on TGD's Energy used kWhr/m2/year
  7. 7. renewables in schools • thermal solar • photovoltaic For more information visit energyineducation.ie • wind • biomass
  8. 8. energy in schools • our energy policy & design approach • research projects informing approach to achieving new energy regulation targets • NZEB design priorities • proposed implementation of NZEB interim • proposed next steps
  9. 9. the journey so far ! are we there yet ? • Colaiste Choilm, Tullamore - 2007 • Moynalty NS, Meath - 2009 • Powerscourt NS, Wicklow - 2009 • St Patrick’s NS, Greystones - 2013 • St Catherine’s NS, Aughrim - 2014 • The Downs NS, Mullingar - 2014
  10. 10. – Ireland’s Lowest Energy Secondary School • quality sustainable educational facility, fit for purpose, BER A2 • real time laboratory testing and providing automated and user feedback • on a range of low energy design solutions • maximising rainwater recovery with 87% mains water replacement to date • 59% improvement over Part L and 45% carbon dioxide emissions reductions. EPC ratio of 0.41 • air leakage test result 1.8 m3/m2/Hr @ 50 Pa, (64% improvement on current Department standard, 75% better than comparative building standards) 0 50 100 150 200 250 Schools built in 1980's Schools built in 1990's Schools, Best Practice Current school designs based on TGD's Colaiste Choilm Energy used kWhr/m2/year
  11. 11. u values w/m2k Element bldg regs low energy passive walls 0.27 0.16 0.09 floor 0.25 0.25 0.08 roof 0.2O 0.16 0.08 glazing 2.2 1.8 0.8/0 .9 • passive schools • Moynalty & Powerscourt the building fabric BER A2
  12. 12. passive classrooms research project Greystones 
  13. 13. NZEB new builds & BER uplift existing schools The Downs N.S. Mullingar & St. Catherine's N.S. Aughrim
  14. 14. energy in schools • our energy policy & design approach • research projects informing approach to achieving new energy regulation targets • NZEB design priorities • proposed implementation of NZEB interim • proposed next steps
  15. 15. NZEB design priorities • Passive architectural design principles • Energy efficient envelope and technologies • Modelling
  16. 16. NZEB design priorities • Passive architectural design principles • Energy efficient envelope and technologies • Modelling
  17. 17. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling 8 fabric profiles analysed • optimum fabric upgrade selected - roof 0.1w/m2 K - floor 0.12w/m2 K - external walls 0.15w/m2 K - glazing 0.8w/m2 K • air infiltration 1 m3/hr/m2 • reduced PSI for thermal bridging
  18. 18. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling 8 technology profiles analysed including mixes of - lighting LED - solar thermal - photovoltaic - chp - heat pumps - heat recovery ventilation options MHRV System
  19. 19. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling selected targets * model parameters A 55 kWh/m2 & 10 % renewables B 50 kWh/m2 with no renewables C 40 kWh/m2 & 20 % renewables • dry resultant temp does not exceed 25 0C for 5% of occupied year • occupied period 1st Sept to 21 June (183 days) • occupancy 9am to 3pm • daylight Factor 4.5 % • 16 different energy profiles developed modelling – Sustainable Engineering Solutions Ltd
  20. 20. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling  SBEM (not compatible with Irish Schools operational criteria) - hot water demand - density ratios in classrooms - occupancy hours - ventilation rates and demand ventilation - internal design temperature - occupancy rates - uses 2.7 as electrical primary energy conversion factor
  21. 21. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling option SBEM 66.5 Kwh/m2/yr. A 55 kWh/m2 & 10 % renewables No B 50 kWh/m2 with no renewables No C 40 kWh/m2 & 20 % renewables No
  22. 22. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling SBEM DTM selected option * 66.5 Kwh/m2/yr. 23 Kwh/m2/yr. A 55 kWh/m2 & 10% renewables No YES B 50 kWh/m2 with no renewables No YES C 40 kWh/m2 & 20% renewables No YES
  23. 23. NZEB design priorities Passive architectural design principles Energy efficient envelope and technologies Modelling SBEM DTM selected option * 66.5 Kwh/m2/yr. 23 Kwh/m2/yr. A 55 kWh/m2 & 10% renewables No YES B 50 kWh/m2 with no renewables No YES C 40 kWh/m2 & 20% renewables No YES 20% Renewables 13.3 Kwh/m2 4.6 Kwh/m2 Result = inflated primary energy & over provision of renewables
  24. 24. Renewables / SBEM/ NZEB INTERIM It is a comparative evaluation tool not a design tool - assumes the renewable energy is useful - does not factor in / out feed-in tariffs the maths do not add up !!! Large PV ≠ usable energy -/+ export free to grid + grid charges SBEM & renewables logic
  25. 25. Renewables / SBEM/ NZEB INTERIM NZEB tools for school analysis should enable • calculation of the accurate electrical base load • account for any feed in tariffs (FIT), etc. • evaluation of the correct amount of cost optimum PV usable energy + FIT - grid charges = Cost optimum PV SBEM & renewables logic
  26. 26. energy in schools • our energy policy & design approach • research projects informing approach to achieving new energy regulation targets • NZEB design priorities • proposed implementation of NZEB interim • proposed next steps
  27. 27. Interim NZEB performance specification Implementation ?  projects commencing design after 1 Jan 2017 will use interim specification for projects not occupied before 31 Dec 2018 not proposing application on  projects presently at various stages of design that will not be completed prior to the 2018 deadline  projects at advanced design stages but not programmed to go to construction until circa 2018 at the earliest  existing projects which will be completed in accordance with their grant of planning permission
  28. 28. deliverables to apply NZEB interim specification for schools  the Simplified Building Energy Model (SBEM) requires upgrading to reflect the Irish Schools criteria  additional capital funding  provisions to make the maths add up on renewables in schools
  29. 29. energy in schools • our energy policy & design approach • research projects informing approach to achieving new energy regulation targets • NZEB design priorities • proposed implementation of NZEB interim • proposed next steps
  30. 30. Next steps  deliverables to support NZEB interim Specification for schools are required  the Down’s NS detail design is underway based on interim specification requirements, prequal Q1, tendering Q2, opening 2018
  31. 31. maximising nature • passive solar design • daylighting • quality ventilation technologies • > enhanced insulation • > air tightness • > enhanced glazing • lighting & controls • heating & controls • water efficiency • I.T. & web based technologies • renewable energy on site • thermal bridging applying NZEB interim specification to schools
  32. 32. Next steps (continued)  in accordance with DHPCLG direction, public sector interim specification to be used by all design teams appointed/ commencing design from 1 January 2017 where the schools will be occupied after 31 Dec 2018  the exact cost implications need to be established  the funding implications will need to be addressed
  33. 33. Thank you for listening www.energyineducation.ie. energy in schools Workshop on Public Sector NZEB Interim Specification Jan 2017

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