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

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 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. 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. 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. 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 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. – 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. 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. passive classrooms research project 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
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. 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. 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. 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. 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. 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. 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. 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 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. 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. 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
 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. 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 for listening
www.energyineducation.ie.
energy in schools
Workshop on Public Sector NZEB
Interim Specification Jan 2017