Practice Exercise: Building Envelope Systems

Your Name
Tanwar, Jayant
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Baseline Scenario:

The baseline scenario is:

  • R38 Roof Construction
  • 12/5 Operating Schedule
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The energy usage intensity for this baseline scenario is 58.8 kBtu/ft2/yr

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Scenario 1: Building Envelope

I recommend the following changes to the Baseline schedule:

  • Wall Construction using R38 wood
  • Glazing % (WWR)
    • Southern Wall: 65% (Having 30% can decrease only by 0.04 kBtu/ft2/yr)
    • Northern Wall: 30% (kept 30% as the minimum WWR)
    • Western Wall: 65% (Having 30% can decrease only by 0.10 kBtu/ft2/yr)
    • Eastern Wall: 95% (Significant increase when lower WWR)
  • Thermal Properties of Glazing Surfaces
    • Southern Wall: Dbl LoE (only 0.25 kBtu/ft2/yr difference compared to Trp LoE)
    • Northern Wall: Dbl LoE (only 0.17 kBtu/ft2/yr difference compared to Trp LoE)
    • Western Wall: Trp LoE (1.14 kBtu/ft2/yr difference compared to Dbl LoE)
    • Eastern Wall: Trp LoE (4.10 kBtu/ft2/yr difference compared to Dbl LoE)
  • Window Shading: For window shading I have kept the original value as modeled since as that is the best scenario (hence no graph shown)
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The energy usage intensity for this Power and Lighting measures on top of baseline scenario is 53.2 kBtu/ft2/yr

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Scenario 2: Power and Lighting Measures

I recommend the following changes to the Baseline schedule:

  • Plug load Efficiency of 0.6 W/sf
  • Lighting Efficiency of 0.3 W/sf
  • Daylighting & Occupancy Controls
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The energy usage intensity for this Power and Lighting measures on top of baseline scenario is 50.5 kBtu/ft2/yr

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Scenario 3: Photovoltaic Panels

I recommend the following changes to the Baseline schedule:

  • Panel Efficiency of 20.4%
  • Payback limit of 30 yrs
  • Surface Coverage of 90%
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The energy usage intensity for this photovoltaic panel on top of baseline scenario is 18.9 kBtu/ft2/yr

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Scenario 4: Scenario 1 + 2

Combining Power and Lighting recommendations to Building Envelop recommendations. The energy usage intensity for this scenario is 44.9 kBtu/ft2/yr

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Scenario 5: Scenario 1 + 2 +3

Combining Power and Lighting recommendations, Building Envelop recommendations and Photovoltaic Panel recommendations. The energy usage intensity for this scenario is 5.03 kBtu/ft2/yr

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