Your building envelope recommendations for this practice exercise should feature:
- Your recommended settings for the Insight Factor tiles
- A screenshot from Insight showing the Predicted Mean EUI and the range of values resulting from your assumptions
- Base Scenario
Benchmark EUI is 60.9 kBtu/ft2/yr
- Building Envelope choices
Window-to-Wall Ratio on South: 15%-0%
Window-to-Wall Ratio on South, North, West and East Wall: 0%
Window Shades on South, North, West and East side: 1/3 Win Height - 2/3 Win Height
Windows Glass Choice: Trp LoE
Wall Choice:
All the wall types can meet the EUI requirement of 54, including uninsulated, R38-Wood, R-13 Wood, 12.25-inch SIP, 14-inch ICF, R13 Metal, R2 CMU, R13+R10 Metal
But the best choice is 12.25 inch-SIP and 14-inch ICF
The Lowest Achievable EUI is 49.5kBtu/ft2/yr:
- building envelope + power & lighting choices
Plug Load Efficiency (the equipment and appliances that draw power): 0.6 W/sf
Lighting Efficiency (based on the efficiency of the lighting fixtures): 0.3 W/sf
Daylighting & Occupancy Controls: Occupancy controls or Occupancy Controls & Daylighting
The Lowest Achievable EUI is 29.6kBtu/ft2/yr:
- building envelope + power & lighting choices + Photovoltaic panels
Surface Coverage: 90%
Panel Efficiency: 20.4%
Payback Limit: 20 years or 30 years
The Lowest Achievable EUI is -12 kBtu/ft2/yr:
Model History:
In summary, building envelope, lighting and power, and PV are all very important in designing a building.