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Part 9 Energy Efficiency Housing and Small Buildings Energy Target Validation

Part 9 Energy Efficiency Housing and Small Buildings Energy Target Validation. Pre-Public Review December 2011. Policy Advice. Working Target (energy performance level) consistent with the performance of ERS 80, when assessed according to NRCan's EnerGuide for New Homes Rating System

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Part 9 Energy Efficiency Housing and Small Buildings Energy Target Validation

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  1. Part 9 Energy Efficiency Housing and Small BuildingsEnergy Target Validation Pre-Public Review December 2011

  2. Policy Advice • Working Target (energy performance level) • consistent with the performance of ERS 80, when assessed according to NRCan'sEnerGuide for New Homes Rating System • should be focus and primary rationale for development of changes • i.e. not using cost/benefit data as primary rationale • This means: • No Energy Baseline Required • No Improvement over baseline (unlike NECB)

  3. Validation Protocol • Existing NRCan approach • model 11 house archetypes for each climate zone, • average results per climate zone • average climate zone results across Canada • Modeling assumptions reflect • minimum code requirements or • reasonable values in typical construction • Equivalent to ERS 80 on average • Committees considered: • constructability • provincial requirements • cost/benefit optimization

  4. Working Target Validation • Assumptions • Ventilation • with/ without HRV, code ventilation rates, 8 hours daily, entire year • Fuel • typical for modeling location, and • total representative Canadian fuel mix • Operating conditions • 2 adults, 2 children, 50% at the time • 21°C in the main space, 19°C in the basement • 225 l/day hot water use at 55°C • 24 kW plug loads

  5. Working Target Validation • 11 House Archetypes • 1 • 2 • 3 • 4 • 5/6 • 7 • 8 • 9 • 10/11

  6. Working Target Validation • 11 House Archetypes * based only on considering exterior walls

  7. Adjustment of Working Target • Challenges to reach ERS 80 • ERS 80 = R2000 Construction • airtightness of 1.5 ACH mandatory • in most cases: continuous wall insulation required • HRV mandatory • cost, enforcement and constructability concerns • Considering energy reduction of validation results • avoid unintended consequences on other code requirements • current proposals reach substantial and significant savings • proposed requirements meet the intent of the working target • staying within the bounds of constructability

  8. Adjustment of Working Target • Benchmarking energy savings • 7800 non-program housing built after 2005 • tested prior to energy retrofit • tested values ─ potential incremental energy savings

  9. Working Target Validation • Calculation of Average across all house types • With HRV / Without HRV • Average • ERS = 78.27 • ERS = 78.18

  10. Working Target Validation • Calculation of Average across all climate zones • With HRV / Without HRV • Average (unweighted)ERS = 78.33 • ERS = 78.20 • Average (weighted)ERS = 78.22 • ERS = 78.43

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