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Orla Coyle– NZEB and High Performance Retrofit- Programme Manager 15 th May 2018

The Institution of Structural Engineers Nearly Zero Energy Buildings. Orla Coyle– NZEB and High Performance Retrofit- Programme Manager 15 th May 2018. Non Domestic – New Buildings - NZEB. Based on NEAP Methodology 60% Improvement on Previous Regulations

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Orla Coyle– NZEB and High Performance Retrofit- Programme Manager 15 th May 2018

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  1. The Institution of Structural EngineersNearly Zero Energy Buildings Orla Coyle– NZEB and High Performance Retrofit- Programme Manager15th May 2018

  2. Non Domestic – New Buildings - NZEB Based on NEAP Methodology 60% Improvement on Previous Regulations - Improvement in Fabric Performance - Improvement in Efficiency of Systems - 10% to 20% Renewable Energy OPW – Lesson Lane

  3. Domestic – New Buildings - NZEB 25% Improvement on Current Regulations Same Fabric Performance - Boiler with Increased PV - Boiler with MVHR and PV - Heat Pump Durkan Homes – Citywest

  4. Primary Energy Factor • Methodology outlined in EN ISO 52000 -2017 • Based on Irelands Energy Projections 2017 • https://www.seai.ie/resources/publications/Irelands_Energy_Projections.pdf

  5. Renewable Energy Ratio • Calculated in line with ISO 52000 • Included: • PV • Solar • Wind • Heat Pump • Biomass/ Biogas • District heating • CHP The Renewable Energy Ratio RER = EPrenPrimary Energy of the Renewables EPtotTotal Primary Energy

  6. Renewable Energy Ratio - General PV/ Wind/Solar/Biomass/ Biogas/ District Heating • Equation 1 Ep,ren= Generated Energy x Fp, ren • Equation 2 Ep, tot= Generated Energy x Fp, ren+ Generated Energy x Fp, nren

  7. Renewable Energy Ratio – Heat Pump Heat Pump • Environmental Energy = (HtgDemandHP - Consumed EnergyHP)

  8. Renewable Energy Ratio – CHP CHP • Saved Energy = Heat DemandCHP x [(PEFgas / 0.9) + ((CHPeff_elecx PEFelec) / CHPeff_heat) – (PEFgas / CHPeff_heat)]

  9. Buildings Other than Dwellings

  10. What is the NEAP Methodology

  11. NEAP Methodology – Asset Rating – Part L EPC/CPC is ratio of Actual Building to Reference Building Reference Building is defined in Part L

  12. NEAP Methodology – Asset Rating – BER BER is ratio of Actual Building to Notional Building Notional Building is not changing

  13. NEAP Methodology – Asset Rating – Process Load For specialist process: • Setting thresholds removing the Process HVAC demand from the RER calculation • Adjusting the reference building for activities with specialist processes.

  14. SBEM Development – Activity Database • BRE Research • Irish Specific Requirements

  15. SBEM Development – Tool Example of some changes • More than 1 source of Heating • Variable Speed Pumps • Demand Control Ventilation • LED Lighting

  16. NZEB Compliant Office Building – Interim Methodology

  17. NZEB Compliant Office Building – Interim Methodology

  18. NZEB Compliant Laboratory Building – Interim Methodology

  19. Operational Energy Performance Set Occupancy Set Weather Set Temperatures Set Equipment Set Usage Profiles Set Water Demand Actual Occupancy More Appropriate Weather Actual Temperatures Actual Equipment Actual Usage Profiles Actual Water Demand

  20. Dwellings

  21. Regulatory Impact Assessment

  22. DHW Energy – Proposed Changes

  23. Lighting Energy – Proposed Changes New buildings: • Enters details based on design of the installed lighting, including Wattage, Efficiency and/or Lux levels. Existing buildings: • Enters default efficiency based on the lamp type/ rating with the lighting level fixed.

  24. Updating DEAP Guidance based on previous consultation • Fixed Cooling accounted for in calculation • Allowance for 2 main heating systems where present • High Heat Retention Storage Heaters • Clarification re Curtain Walling and Window Systems • Efficiency Adjustment to MVHR for uninsulated ductwork • Waste Water Heat Recovery • Inclusion of electric showers

  25. Other Factors to Consider

  26. Renewables • TICK BOX or FIT FOR PURPOSE ?

  27. Renewables - What type is most appropriate

  28. Key Design Considerations

  29. THERMAL BRIDGING

  30. Internal Environmental Quality - Overheating

  31. Internal Environmental Quality - Ventilation

  32. Engaging the Building User

  33. Questions

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