BFH The Path to Net Zero Energy Houses in Cold Climates

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The basis of a presentation built by Bfreehomes as a teaching tool for builders interested in understanding how to become a builder of Net Zero Energy Houses. Includes three case studies.

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BFH The Path to Net Zero Energy Houses in Cold Climates

  1. 1. }  The Path to Net Zero The Process of Progressions Current Practice 25% reduction 50% reduction A Net Zero Energy House produces as much energy as it uses on an annual basis. This presentation focusses on how to get there. 75% reduction Net Zero Energy
  2. 2. }  Focus of measures in progressions Reductions most cost-effective in this order Air tightness measures Increase insulation Water conservation Mechanicals Renewables
  3. 3. }  NRCan targets/goals for Industry Capacity exceeds code requirements Issues Concerns Challenges Innovations on the horizon
  4. 4. }  Energy Intensity Energy Intensity vs. House Size Issues Concerns Challenges
  5. 5. }  Series of challenges to reduce various loads Energy End Use Patterns Lighting 5% Appliances 13% Water 17% Space 65% Lighting 6% Space 57% Appliances 16% Water 21% Reduce space heating load Air tightness measures Insulation Measures Reduce water heating load ERS80 (PRE-2012 R-2000) Lighting 10% Space 26% Water 20% Fixtures ERS86 (conventional HVAC) Drainwater Heat Recovery Meeting DWH load becomes biggest challenge Net Zero Energy (non-solar thermal) Mechanicals designed around low temp hot water delivery Appliances 44% Lighting 13% Space 33% Net Zero Energy (solar thermal option) Note: Ventilation included in ‘Space’ component in charts, ranges from 2% of overall energy load in ERS80 to 9% in NZE Small loads, can sacrifice efficiency @ blower Electrical base loads Appliances 46% Water 8% Minimal electrical loads @ fans/ pumps Primarily occupant driven Builder has minimal impact
  6. 6. }  Energy Analysis & Financial Evaluation Work Flow Select target reduction from baseline Measures taken in initial progressions impact the types of measures (and associated costs) further down the path to Net Zero Energy. Model for 25%, 50%, 75%

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