We've got a question concerning "Building Area Method Compliance Path" in the Chapter 9: "Lighting", ASHRAE Standard 90.1-2007.
Appendix G: Performance Rating Method involves the Table G3.2 "Power Adjustment Percentages for Automatic Lighting Controls". In accordance with this Table, in case the total project square > 5.000 ft2
(465 m2) the usage of lamps with occupancy sensor allows to calculate the power at 10% below the nominal value.
Is it possible to make reference to the Table G3.2 (Appendix G) in
calculation of "Lighting" (LEED-CI 2009, Credit EA c 1.1 - Optimize Energy Performance: Lighting Power)?
Thank you for your support!
Dane Sanders
PrincipalClanton Associates
68 thumbs up
August 6, 2010 - 2:02 pm
Andreas,
This is an interesting question. If you were asking about a LEED NC project, then the 10% occupancy sensor savings could be built into the building energy model. However, since you are dealing with a LEED CI project, it is my understanding that Credit EA c1.1 for Lighting Power Density does not allow for reductions due to lighting controls. The occupancy sensors are accounted for in Credit EA c1.2 Optimize Energy Performance - Lighting Controls - Occupancy Sensors for 75% of the Connected Lighting Load. Since there is a separate point for occupancy sensors, taking credit in the Lighting Power Density EA c1.1 would be double counting the points, therefore is not allowed.
All the best,
Dane