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Near Zero Energy Commercial Buildings

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Henry J Lyons presents at SEAI Energy Show on NZEB, Near Zero Energy Commercial Buildings

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Near Zero Energy Commercial Buildings

  1. 1. NZEB – Near Zero Energy Commercial Buildings Henry J Lyons
  2. 2. NZEB in a NUTSHELL + + =
  3. 3. High Performance Thermal Envelope Limit the heat loss through the fabric of the building Limit Solar Heat Gains – Reduce need for mechanical cooling. Where such systems are required, ensure they are energy efficient.
  4. 4. FABRIC FIRST – Thermal Performance of Building Elements Limit the heat loss through the fabric of the building Back Stop U-Values (Part L – 2008 Figures in Red) 0.27 W/m²K 0.25 W/m²K 0.25 W/m²K 0.27 W/m²K Unheated Space 0.22 W/m²K 0.16 W/m²K 0.27 W/m²K 0.20 W/m²K 0.25 W/m²K 2.2 W/m²K
  5. 5. FABRIC FIRST – Thermal Bridging Calculations Limit the heat loss through the fabric of the building Back Stop U-Values (Part L – 2008 Figures in Red) 0.12 W/mK 0.16 W/mK 0.09 W/mK 0.07 W/mK 0.30 W/mK 0.04 W/mK 0.05 W/mK 0.12 W/mK 0.16 W/mK 0.09 W/mK 0.07 W/mK 0.30 W/mK 0.04 W/mK 0.05 W/mK
  6. 6. FABRIC FIRST – Reduce Solar Heat Gain Limit Solar Heat Gains – Reduce need for mechanical cooling. Where such systems are required, ensure they are energy efficient.
  7. 7. FABRIC FIRST – Reduce Solar Heat Gain
  8. 8. FABRIC FIRST – Air Permeability Limit the heat loss through the fabric of the building Back Stop Value of 5m³/hr/m² (Part L 2008 - 10m³/hr/m²)
  9. 9. High Energy Efficient Systems Heating Plant: • Heating Plant Efficiency • Controls for Space Heating and Hot Water Mechanical Ventilation and Air- Conditioning • Specific Fan Power • Cooling Plant Efficiency • Controls – Reference case has Demand Controlled Ventilation Artificial Lighting • Luminaire Efficacy – Lumens per Circuit Watt • Controls – Manual Switching / Daylighting / Presence Detection
  10. 10. On Site Renewables Renewable Energy Ratio: There are 2 routes to achieve compliance with the renewable energy target: Route 1 – if the BER target of A3 is achieved with no tolerance (0% margin), 20% of the building energy must be provided by onsite/near site renewable technologies Route 2 – if the BER target of A3 is achieved with a minimum of 10% margin, then 10% of the building energy used must be provided by onsite / near site renewable technologies • Solar PV • Combined Heat & Power (CHP) • Heat Pumps • District Heating • On Site Wind Generation
  11. 11. Transitional Arrangements In general, these requirements applies to works, or buildings in which a material alteration or change of use or major renovation takes place, where the work, material alteration or the change of use commences or takes place, as the case may be, on or after 1st January 2019. However, the 2008 standard may continue to be used in the case of buildings: • Where the work, material alteration or the change of use commences or takes place, as the case may be, on or before 31st December 2018, or • Where planning approval or permission for buildings has been applied for on or before 31st December 2018, and substantial work has been completed by 1st January 2020. “Substantial work has been completed” means that the structure of the external walls has been erected. CSO Figures
  12. 12. pat.kirwan@hjlyons.com @patkirwan

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