NZEB Interm Specification by Sean Armstrong

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The Interim NZEB Specification for Public Sector buildings sets out a performance specification for new buildings owned and occupied by Public Authorities after 31st Dec 2018. It is intended that this specification will form the Nearly Zero Energy Buildings requirement in the interim period until the new 2017 Part L for Buildings other than Dwellings takes effect.

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NZEB Interm Specification by Sean Armstrong

  1. 1. Nearly Zero Energy Buildings (NZEB) for Public Sector Seán Armstrong, Housing/Building Standards Section, DHPCLG
  2. 2. Todays Objectives • Explain the Public Sector Interim Nearly Zero Energy Building Specification • To learn how to apply it using NEAP/SBEM • To gather feedback on Interim NZEB Public performance requirements
  3. 3. Outline • Implementing the Energy Performance of Buildings Directive • What are Nearly Zero Energy Buildings • How does it apply to Public Sector • Next Steps
  4. 4. Article 9 Requirements include: • All new buildings to be “Nearly Zero Energy Buildings” by 31st Dec 2020 • New buildings owned and occupied by Public Authorities to be `Nearly Zero Energy Buildings’ after 31st Dec 2018 • Major Renovations in Building Codes to be at Cost Optimal Level. Recommendations on NZEB issued by Commission in July 2016 • Member states should take account of “the period of validity of building permits, the length of construction and completion of building works” to avoid falling short of the NZEB target dates in the EPBD. Energy Performance of Buildings Directive (EPBD)
  5. 5. Implementation of EPBD • TGD L Buildings other than Dwellings is currently under review to provide detailed NZEB guidance and include Major Renovations performance requirement: – Public Consultation – 24th February 2017 – Final Publication-Mid 2017 – Application- planned for early 20191 • NZEB Interim Specification for Public Buildings issued 23rd Dec 2016 for buildings commencing design in early 2017 • SI 4 of 2017 has amended Building Regulations to include the definition of NZEB • TGD L Dwellings 2011 has been amended to include NZEB Definition of an MPEPC of 0.30 and MPCPC of 0.35 for dwellings completed after 31st Dec 2020 1 Subject to Regulatory Process
  6. 6. EPBD Definition- Nearly Zero Energy Building ‘nearly zero-energy building’ means a building that has a very high energy performance, as determined in accordance with Annex I. The nearly zero or very low amount of energy required should be covered to a very significant extent by energy from renewable sources, including energy from renewable sources produced on-site or nearby; RTE PV Array
  7. 7. Commission Recommendation for offices-July 2016 • Offices 85-100 kWh/(m2.y) of primary energy use covered by 45 kWh/(m2.y) met by on-site renewable sources
  8. 8. Public Sector Interim NZEB Specification • Issued by DHPCLG on 23rd December 2016 to all Government Departments, Agencies and Local Authorities • Developed in conjunction with OPW, DES, HSE and SEAI • Available to download from SEAI website • Intended to be used until by Public Sector new Part L- Buildings other than Dwellings applies in early 2019 • Should be used for all buildings owned and occupied by Public Authorities expected to be completed after 31st Dec 2018 • Detailed guidance on application and Renewables Calculation tool to be issued in the coming week
  9. 9. Key Components of performance requirement • Provides an improvement in performance in the order of 50% to 60% over 2008 TGD L • Improved Fabric Specification • Advanced Services and Lighting specification • Renewable Energy Ratio of 20% .
  10. 10. Performance requirements for Public Sector Specification Reference Building-Fabric Parameter Current reference values-TGD L 2008 Reference values-Public Sector Specification Total Floor Area and Building Volume Same as actual building Same as actual building Opening Areas Offices and Shops –windows and pedestrian doors are 40% of the total area of exposed walls Offices and Shops –windows and pedestrian doors are 40% of the total area of exposed walls Walls U=0.27 W/m2K U=0.18 W/m2K Roofs U=0.16 W/m2K U=0.15 W/m2K Floor U=0.25 W/m2K U=0.15 W/m2K Thermal bridging Add 16% to fabric heat loss Actual Length of Key Junctions x Advanced psi value Air Permeability 10m3/(hr.m2) 5m3/(hr.m2) Floor area <250m2 3m3/(hr.m2) Floor area >250m2 Window U Value Solar energy transmittance 2.2 W/(m2K) 0.72 1.4 W/(m2K) 0.40
  11. 11. Services Parameter Current reference values- TGD L 2008 Proposed reference values-TGD L 2017/Public Sector Specification Heating efficiency (heating and hot water)% 0.73 CoP 91% Gas Boiler Cooling Seasonal Energy Efficiency Air conditioned building Ratio (SEER) SEER=1.67 SEER=4.5 Lighting divide the illuminance by 100, then multiply by 3.75 W/m2 per 100 lux 65 lm/circuit watt Occupancy Control Local Manual Switching Automated Daylight Control Local Manual Switching Automated Central Ventilation SFP 2 (W/(l/s)) 1.8 (W/(l/s)) Variable speed control of fans No Yes Renewable Energy Ratio None 20% using photovoltaics
  12. 12. Interim Public Sector Specification-Fabric Backstops • New Backstops (W/m2K) as for TGD L-Dwellings: – Pitched Roof 0.16 – Flat roof 0.2 – Walls 0.21 – Floors 0.21 – Windows 1.6 – Curtain walling 0.21 – Vehicle access doors 1.5 • Airtightness Backstop-5m3/(hr.m2)
  13. 13. Checking NZEB using NEAP • Current version of SBEM 3.5 to be used - available on SEAI website • Calculate the performance of the proposed building in SBEM using the draft Interim Public Sector Specification for fabric and services. This must be done manually using “table 1” from the draft interim specification with same size and shape as actual building. This then becomes the reference building. • Calculate the performance of the proposed building in SBEM using the actual design specification for the building • Compare the primary energy (kWh/m2/yr) and carbon dioxide emissions (kgCO2/m2/yr) between the building with the actual performance specification and the building modelled with the draft Interim Public Sector performance specification.
  14. 14. Checking NZEB using NEAP • Where the actual building performance specification has a primary energy performance equal to, or lower than the primary energy performance (kWh/m2/yr) of the same building modelled using the draft Interim Public Sector Specification it achieves the NZEB performance specification for energy i.e. The Energy Performance Coefficient (EPC) must be equal to or less than MPEPC =1.0 • Where the actual building performance has a carbon dioxide emissions performance equal to, or lower than 1.15 times the carbon dioxide performance (kgCO2/m2/yr) of the building modelled using the draft Interim Public Sector Specification it achieves the NZEB performance specification for carbon dioxide emissions. Ie. The Carbon Performance Coeffient (CPC) Must be equal to or less than MPCPC =1.15 • EPC/CPC Spreadsheet calculation tool to be released on SEAI website in coming week
  15. 15. • Renewables requirement will be included in TGD L Buildings other than Dwellings as Renewable Energy Ratio (RER)-20% • It is recognised that in certain confined situations it may not be possible to achieve the full 20% RER. In these situations Public Sector Authorities should provide the optimum proportion of energy from renewable energy sources that is practically possible. • In all cases the overall energy performance of the building should be equivalent to the performance of the building as if the 20% RER had been achieved. • Renewable energy sources include Photovoltaics, Heat Pumps (Air source and ground source), Biomass, Solar Thermal ,Primary Energy Savings from Combined Heat and Power (CHP), Renewable district heating • Primary Energy Factor for electricity for calculating RER–the same as residential 2.19 (3 year forward look) Interim Public Sector Specification RER
  16. 16. Costs • Performance requirements are based on cost optimal reports published in accordance with EPBD: http://www.housing.gov.ie/housing/building- standards/energy-performance-buildings/energy- performance-buildings • Table 5.3a of Non Residential Cost Optimal Report provides Initial Investment Costs for the energy related costs for different performance levels for 5 buildings. • Further analysis currently being performed for RIA. • Consultant appointed for TGD L 2017 and costs will be available for TGD L Public Consultation-end Feb.
  17. 17. Table 5.3a contd.
  18. 18. TGD L-Draft Major Renovation proposal • Define as “more than 25% of the surface area of the building envelope undergoes renovation” • Provide menu of measures to bring to cost optimal: – Upgrade inefficient heating systems – Upgrade inefficient cooling systems – Upgrade inefficient lighting systems
  19. 19. New Build: - Walls 0.13 W/m2K - Windows 0.82W/m2K - Roof 0.11W/m2K - Renewables-Pellet boiler and 938m2 PV EU Study CT5 Report Selected Examples of NZEB http://www.epbd-ca.eu/wp-content/uploads/2011/05/CT5_Report_Selected_examples_of_NZEBs-final.pdf
  20. 20. Retrofit: -Walls 0.13 W/m2K -Windows 0.80W/m2K -Roof 0.08W/m2K -Renewables:Photovoltaic and geothermal heat pump
  21. 21. New Build -Walls 0.14 W/m2K -Windows 0.78W/m2K -Roof 0.10W/m2K -Renewables:Air source heat pump
  22. 22. Efficiency House Plus with E-mobility in Berlin Project aim: This pilot building generates its own energy and makes it available to the users and the electric vehicles. Excess energy is fed back into the grid or stored in a battery. An annual positive energy balance is required for primary and final energy use. Building address: Fasanenstraße 87a, 10623 Berlin Building type: Residential Non-residential Public New Renovated X X Single-family house with 2 floors Building size: 203 m² useful floor area (AN, with AN=0.32*Vgross), 138 m² living area Building envelope construction: The floor, the walls and the roof are made of timber panels filled with up to 52 cm cellulose insulation. The windows have triple glazing. Thermal bridges have been minimised. Photovoltaic modules cover the roof and the façade. All house elements can be separated and moved to another location or be disposed of after the lifetime of the building. Building envelope U-values: Wall 0.11 W/m²K Window 0.70 W/m²K Roof/ceiling to the attic 0.11 W/m²K Cellar ceiling/ground slab 0.11 W/m²K Building service systems: The house is heated by a central heating system with an air-to-water heat pump and floor heating. A balanced mechanical ventilation system with 80 % heat recovery and a building energy management system with touch pads are installed. The PV systems on the roof and facades generate electricity that is used by the building, fed into the grid or stored in a battery. The battery, with a capacity of 40 kWh, is made of 7,250 single second-hand battery cells formerly used in electric cars.
  23. 23. Next Steps • Public Sector Specification – Public Sector Interim Specification available on SEAI Website – Detailed guidance and RER calculation tool to be provided in coming week – DHPCLG ,OPW,DES ,SEAI and HSE working group to continue to support specification • TGD L 2017-Buildings other than dwellings – Public Consultation of TGD L and Regulatory Impact Assessment by 24th Feb. 2017 – NEAP for TGD L 2017 to go for public consultation simultaneously – Close of TGD L 2017 Public Consultation Mid-April – Publication of TGD L by mid 2017 – TGD L 2017 planned to apply by start of 2019 (subject to regulatory process)
  24. 24. http://www.seai.ie/Your_Building/BER/Non_Domestic_buildings/NZEB- Commercial-and-Public-Sector/Nearly-Zero-Energy-Buildings.html It is recognised that in certain confined situations it may not be possible to achieve the full 20% RER. In these situations Public Sector Authorities should provide the optimum proportion of energy from renewable energy sources that is practically possible. In all cases the overall energy performance of the building should be equivalent to the performance of the building as if the 20% RER had been achieved.
  25. 25. www.housing.gov.ie

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