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Sustainability - ASHRAE/IES 90.1
Goals - Social Investment - Environmental Stewardship - Energy Initiatives - Products
State Energy Codes - Contact Us
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Energy efficient design of buildings:
ASHRAE/IESNA Standard 90.1
- ASHRAE/IESNA Standard 90.1 institutes power density limits for lighting (W/ft2).
- This standard is used as a basis for state energy codes, and many states have adopted several versions.
- Applies to:
- New construction
- Existing nonresidential and high-rise residential
- If > 50% of existing luminaires are replaced ( >10% if following Standard 90.1 - 2010 version)
- If renovation increases lighting power
- Total building wattage limitations
- Building area method: allows the designer to use a simple approach of multiplying the building square footage times the total lighting watts per square foot specified for that building type
- Space-by-space method: allows the designer to build a total lighting wattage budget by considering each space (application/task specific) within the building
- Building Area Method - 1999/2001
- Hospital - 1.6 W/ft2
- Library - 1.5 W/ft2
- Manufacturing - 2.2 W/ft2
- Museum - 1.6 W/ft2
- Office - 1.3 W/ft2
- Parking Garage - 0.3 W/ft2
- Retail - 1.9 W/ft2
- School - 1.5 W/ft2
- Building Area Method - 2004/2007
- Hospital - 1.2 W/ft2
- Library - 1.3 W/ft2
- Manufacturing - 1.3 W/ft2
- Museum - 1.1 W/ft2
- Office - 1.0 W/ft2
- Parking Garage - 0.3 W/ft2
- Retail - 1.5 W/ft2
- School - 1.2 W/ft2
- Building Area Method - 2010
- Hospital - 1.21 W/ft2
- Library - 1.18 W/ft2
- Manufacturing - 1.11 W/ft2
- Museum - 1.06 W/ft2
- Office - 0.90 W/ft2
- Parking Garage - 0.25 W/ft2
- Retail - 1.4 W/ft2
- School - 0.99 W/ft2

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| Last Revision Date: July 13, 2011 |
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Page Number
Volume 7
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