Building Envelope Systems

Submitted By
Sage Crosby

Baseline:

This is the baseline EUI with the operating schedule set to 12/5 and the roof construction set to R-38.

image

Impact of Building Envelope-Related Design Decisions:

Some of these factors had virtually no effect on the EUI including window-to-wall ratio on the southern walls and the window shades and type of glazing on the southern and northern walls. The factors with the greatest impact include the WWR for the western and eastern walls and the type of wall construction.

image

Impact of Power and Lighting Measures:

Daylighting and occupancy controls had a relatively small impact, plug load efficiency had a slightly larger impact, but increases in lighting efficiency showed the greatest potential for EUI reductions.

image

Benefits of Adding Photovoltaic Panels:

Increasing the payback limit allows for the greatest savings, but increasing surface coverage also dramatically lowers the EUI. Combined with these, increasing the panel efficiency can lead to a single digit EUI.

image

I recommend minimizing the WWR on the eastern and western walls (ideally to 0%), improving the wall construction (14-inch ICF), increasing lighting efficiency (0.3 W/sf) and plug load efficiency (0.6 W/sf), and increasing the PV payback limit (20-30 years), surface coverage (to 90%), and panel efficiency (to 20.4%). Implementing all of these measures leads to a negative EUI.

image