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Energy in Schools by John Dolan
The document outlines a workshop on energy policy and design approaches for schools in relation to the New Zero Energy Building (NZEB) interim specification introduced in January 2017. It discusses best practices, research projects, and design priorities for energy-efficient buildings, emphasizing the need for robust solutions tailored to the unique operational profiles of schools. Key implementations and next steps for achieving energy regulation targets and improving sustainability in schools are also highlighted.
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Energy in Schools by John Dolan
- 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. 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. 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. energy in schooldesign • 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. maximising nature • passive solardesign • daylighting • quality ventilation utilising technologies • enhanced insulation • air tightness • lighting & controls • heating & controls • water efficiency • I.T. & web based technologies
- 6. issues particular toschools • 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. renewables in schools •thermal solar • photovoltaic For more information visit energyineducation.ie • wind • biomass
- 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. the journey sofar ! 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. – Ireland’s LowestEnergy 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. u values w/m2k Elementbldg 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. passive classrooms researchproject Greystones
- 13. NZEB new builds &BER uplift existing schools The Downs N.S. Mullingar & St. Catherine's N.S. Aughrim
- 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. NZEB design priorities •Passive architectural design principles • Energy efficient envelope and technologies • Modelling
- 16. NZEB design priorities •Passive architectural design principles • Energy efficient envelope and technologies • Modelling
- 17. NZEB design priorities Passivearchitectural 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. NZEB design priorities Passivearchitectural 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. NZEB design priorities Passivearchitectural 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. NZEB design priorities Passivearchitectural 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. NZEB design priorities Passivearchitectural 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. NZEB design priorities Passivearchitectural 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. NZEB design priorities Passivearchitectural 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. 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. 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. 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. Interim NZEB performancespecification 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. deliverables to applyNZEB 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. 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. Next steps deliverablesto 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. 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. 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. Thank you forlistening www.energyineducation.ie. energy in schools Workshop on Public Sector NZEB Interim Specification Jan 2017