Property
*note each set of changes compounds on the previous (e.g. latest envelope settings are representing in the starting point for power and lighting adjustments)
Envelope Changes
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Envelope process
- wall construction initially did not have a large impact on annual site EUI (range = 63-59 kBTU/sf/yr) —> stuck with BIM value
- WWR: Western & Eastern = 30%, Northern = 15%, Southern = 80% (little impact between differences of latter 2)
- Window Glass: Trp Low e for all faces
- Window Shade: East, West 7 South = 1/4 window height, North = BIM (existent but small
Power and Lighting
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Power and Lighting Process
- Plug loads - large impact - BIM value (~1W/sf took site EUI from 51.7 tp 50.2 and decreasing that value down to 0.6 W/sf dropped the EUI down to 41.8)
- Lighting efficiency - also large impact - chose 0.7W/sf to 0.3 W/sf (dropped EUI from 50.2 t0 35.2)
- Daylighting and occupancy controls - having both lowered EUI by 1 kBtu/SF/yr
PV Panels
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PV Panels Process
- PV Surface Coverage = 75%
- Panel Efficiency = 18.6%
- Payback Period = 20 yrs (a little unclear about what factors are considered in how this value relates to the overall site EUI)