1. Baseline Scenario
Using:
- Operating Schedule: 12/5
- Roof Construction: R38
2. Building Envelope Choices
Goal: predicted mean EUI of 54 kBTU/ft2/yr
Using a combination of :
- Thermal properties of wall construction
- Glazing % for each orientation
- Thermal properties of glazing surfaces for each orientation
- Window shading
Recommendations to achieve this goal:
- Wall Construction: R13+R10 Metal
- WWR Northern Walls: 15%
- WWR Southern Walls: 30%
- WWR Eastern Walls: 30%
- WWR Western Walls: 15%
- Window Shades North: 1/3 Win Height
- Window Shades South: 1/3 Win Height
- Window Shades East: 1/3 Win Height
- Window Shades West: 1/2 Win Height
- Window Glass North: Double LoE (as modeled in BIM)
- Window Glass South: Triple LoE
3. Building Envelope + Power and Lighting
Goal: Driving the Predicted Mean EUI down by adding power and lighting measures to recommended building envelop choices
Using:
- Plug load efficiency
- Lighting efficiency
- Daylighting and occupancy controls
- Building envelope choices modeled in (2) that resulted in predicted mean EUI of 54 kBTU/ft2/yr
Recommendations to achieve this goal:
- Plug load efficiency: 0.6 W/sf
- Lighting efficiency: 0.3 W/sf
- Daylighting and occupancy controls: Use both daylighting and occupancy controls
I was able to drive the Predicted Mean EUI to 34.4 kBTU/ft2/yr by using the listed recommendations.
4. Photovoltaic Panels
Goal: Driving the Predicted Mean EUI down by adding photovoltaic panels to the design to recommended building envelop choices and power and lighting measures
Using:
- Surface coverage of PV
- Panel efficiency
- Payback limit
Recommendations resulting in the lowest Predicted Mean EUI:
- Surface coverage of PV: 90%
- Panel efficiency: 20.4%
- Payback limit: 30 yr
I was able to drive the Predicted Mean EUI to -7.38 kBTU/ft2/yr by using the listed recommendations. This means that the building is net positive energy by taking advantage of solar PV. The building would generate more energy than it uses.
