BUILDING THERMAL MODEL
Building Exterior Envelope Parameters
- Utilized Zero•Net PW2500 for the building energy model
- 100% Vision Glass
- 0% Spandrel Glass or insulation in spandrel areas
- Vision glass SHGC selected to meet as closely as possible ASHRAE 90.1-2007 requirements
- Wall performance is the curtain wall performance U-factor
Building Was Modeled In 2 Climate Zones
- Zone 2 – Phoenix, AZ
- Zone 5 – Boston, MA
Building Exterior Envelope Parameters
- Utilized Zero•Net PW2500 for the building energy model
- 100% Vision Glass
- 0% Spandrel Glass or insulation in spandrel areas
- Vision glass SHGC selected to meet as closely as possible ASHRAE 90.1-2007 requirements
- Wall performance is the curtain wall performance U-factor
Building Was Modeled In 2 Climate Zones
- Zone 2 – Phoenix, AZ
- Zone 5 – Boston, MA
| BOSTON, MA | ASHRAE 90.1-2007 |
TYPE 1 CENTER OF GLASS (COG) U-FACTOR=.247 |
TYPE 2 CENTER OF GLASS (COG) U-FACTOR=.117 |
|---|---|---|---|
| Glazing Assembly U-factor | 0.45 | 0.30 | 0.182 |
| Assembly Solar Heat Gain Coefficient (SHGC) | 0.40 | 0.37 | 0.398 |
| Glass as a percentage of exterior wall area | 100.0% | 100.0% | 100.0% |
| Peak Cooling (tons) | 192 | 181 | 171 |
| Tonnage Reduction | 5.7% | 11.0% | |
| Peak Heating (MBH) | 2146 | 2140 | 1923 |
| Gas Boiler (MBH) Reduction | 11.4% | 20.0% | |
| Annual Energy Spend | $126,060 | $113,099 | $105,518 |
| Annual Spend Reduction | 10.3% | 16.0% |
| PHOENIX, AZ | ASHRAE 90.1-2007 |
TYPE 1 CENTER OF GLASS (COG) U-FACTOR=.247 |
TYPE 2 CENTER OF GLASS (COG) U-FACTOR=.114 |
|---|---|---|---|
| Glazing Assembly U-factor | 0.70 | 0.30 | 0.179 |
| Assembly Solar Heat Gain Coefficient (SHGC) | 0.25 | 0.25 | 0.237 |
| Glass as a percentage of exterior wall area | 100.0% | 100.0% | 100.0% |
| Peak Cooling (tons) | 186 | 153 | 143 |
| Tonnage Reduction | 16.1%% | 23.1% | |
| Peak Heating (MBH) | 1965 | 1728 | 1619 |
| Gas Boiler (MBH) Reduction | 12.0% | 17.6% | |
| Annual Energy Spend | $95,282 | $75,333 | $69,144 |
| Annual Spend Reduction | 21.1% | 27.4% |