Page 25 - Zero Net Energy Case Study Buildings-Volume 2

CASE STUDY NO. 7 DPR CONSTRUCTION OFFICE BUILDING
the energy use reduction that would result. The energy savings as calculated from early phase energy modeling did not meet the financial parameters established at the start of design. In addition, with this kind of retrofit some rentable floor area would be lost and the building appearance would be altered to some degree.
The exterior wall facing the street, containing a large area of single-pane industrial sash, was also left in its original state for the same reasons. The cost of replacing the original glass with a new double-glazed storefront that resembled the original was deemed to be beyond the limits established for the financial performance of the renovation.
The insulation values established for the renovation and energy modeling exercise were R = 24 for the roof and R = 3 for the walls, with the single-glazing thermal value for the east-facing window area.
PHOTO: DREW KELLY Zero Net Energy Case Study Buildings, Volume 2 13