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PHASE 1: Building Envelope
Optimal EUI: 53.0
Recommended Settings:
- Building Orientation: 135 degrees
South (side)
- WWR Southern Walls: 95%
- Window Shades South: 1/4 Win Height
- Window Glass South: Trp LoE
North
- WWR Northern Walls: 0%
- Window Shades North : Full range
- Window Glass North: Full range
West
- WWR Western Walls: 30%
- Window Shades West: BIM
- Window Glass West: Trp LoE
East
- WWR Eastern Walls: 95%
- Window Shades East: BIM
- Window Glass East: Trp LoE
PHASE 2: Envelope + Power & Lighting
Optimal EUI: 47.1
With just three internal building features changed we already reduce the EUI by 5.9 kBtu/ft2/yr. This is a great reduction in the long run for operational energy savings.
Recommended Settings:
- Lighting Efficiency: 0.3 W/sf
- Daylight & Occupancy Controls: Daylight & Occupancy Controls (setting)
- Plug Load Efficiency: 0.6 W/sf
PHASE 3: Envelope + Lighting + Photovoltaics
Optimal EUI: 4.88
Considering the addition of photovoltaics the EUI is reduced immensely. With optimal conditions for rooftop solar, EUI is reduced by as much as 39.82 kBtu/ft2/yr. Granted, this assumes a 90% rooftop area available for solar, the most efficient panels, and the best purchase plan —perhaps a bit unrealistic.
Recommended Settings:
- Panel Efficiency: 20.4%
- Payback Limit: 20 yrs
- Surface Coverage: 90%