Sir:
I have done a few ASHRAE 90.1 vs new envelope buildings in New York. In each case, I started the baseline with the existing WWR. Your Baseline is not a mythical ASHRAE building, it is one that ergonomically (good word ??) exists. You just place the ASHRAE 90.1 envelope metrics within. The increase in glazing is something that you must carry with more improved HVAC and/or lighting to get the building's EUI less than the original building Upgraded to ASHRAE metrics).
John R. Aulbach, PE

Hello everyone, ? We are working on multiple existing building renovations in NY which will be filed after October 2016 and therefore will have to comply with the state amended version of ASHRAE 90.1-2013. Most of these designs have upgraded envelope, glazing and some of these also have an increase in glazing area. I wanted to know how to treat this increase in glazing ? should I model it in the Baseline or should the Baseline have the same WWR as the existing building. I have created an example table below to clarify further. Could anyone comment if I should be using Alt 1 or Alt 2? ?
| | DESIGN | | MODELS |
| | | | | | | |
| | Existing Building | Proposed Design | | Proposed Model | ASHRAE 90.1-2013 Baseline ALT 1 | ASHRAE 90.1-2013 Baseline ALT 2 |
| Roofs | Existing un-insulated roof | New roof, fully insulated | | New roof, fully insulated | Fully insulated roof as per table 5.5 | Fully insulated roof as per table 5.5 |
| | | | | | | |
| Walls | Uninsulated masonry walls | Add rigid insulation | | Masonry wall plus rigid insulation | Steel framed walls as per table 5.5 | Steel framed walls as per table 5.5 |
| | | | | | | |
| Glazing | Single pane glazing | Double pane within same opening cavity | | Double pane within same opening cavity | Metal framed all other as per table 5.5 | Metal framed all other as per table 5.5 |
| | | New curtain wall | | New curtain wall | Metal curtain wall as per table 5.5 | No [No increase in fenestration area] |
| | | | | | | |
| WWR | 30% | 35% | | 35% | 35% | 30% |
| | | | | | | |
| Glazing distribution | | | | as per design | as per Proposed Design | as per Existing building |

? Any guidance is much appreciated. ? Thank you ? Madhav ? ? MADHAV MUNSHI| BEMP, LEED AP BD+C ? Kohler Ronan, LLC?|www.kohlerronan.com mmunshi at kohlerronan.com ? ? 171 Madison Avenue, New York, NY 10016 212.695.2422 ?F 212.695.2423 ? 93 Lake Avenue, Danbury, CT 06810 203.778.1017 ?F 203.778.1018 ? Please consider the environment before printing this e-mail. ?
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