Page 121 - Zero Net Energy Case Study Buildings-Volume 1

• Glazing system that has good daylight transmission (47%), low U-value (0.31, a low heat conduction value) and a low shading coefficient (0.40, a low fraction of solar heat gain and half that of regular double-glazing). No reflective or tinted glazing is used in order to maximize daylight collection for the reduction of lighting loads;
• Massiveexteriorwallstoabsorbheatgainduringthedayandshedtheheatinthecoolof the Valley night;
• High roof insulation levels (R-34) under a white-colored “cool roof” thermoplastic mem- brane, primarily to reduce cooling loads.
Interior Lighting
The energy-efficient light fixtures were used to achieve an average installed lighting load as fol- lows:
• Classrooms and offices
• Auditoriums and conference • Service spaces
0.75 watts/sf 1.10 watts/sf 0.50 watts/sf
The lighting design was coordinated for all Phase 1 buildings for both energy efficiency and operations coordination by developing a master fixture schedule. At the time of the Phase 1 proj- ects, the lamp of choice for energy efficiency was the T-5. T5HO lamps were not used because of limitations on dimming this lamp type.
PHOTO: KACEY JURGENS
CLASSROOM & OFFICE BUILDING
CASE STUDY NO. 6
PHOTO: KACEY JURGENS Zero Net Energy Case Study Buildings: Volume 1 105