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
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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
[MEP2014]
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