Dear community, we are doing a 90.1 App. G simulation for an existing manufacturing warehouse renovation + office building addition. Owner decided to change the skylights material, this increased natural light levels substantially resulting in a change of lighting schedule; certain sectors that operated full working time with lights on, are now completely naturally lit.
The question is, would it fair (and permitted by 90.1) to simulate this difference in lighting schedule between proposed and baseline due to increased envelope performance?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 7, 2013 - 10:09 am
Does your modeling software model daylighting responsive controls directly? If so no need for a schedule change. If not then you must perform a separate quantitative daylighting analysis and use that to determine your schedule change. Be sure to provide a narrative explaning the details of how you have calculated the schedule change. This should be done as an exceptional calculation.
Alicia Villanueva
CEORevitaliza consultores
76 thumbs up
April 8, 2013 - 5:19 pm
We are using Energy Plus, which allows to model the F-factor. Your suggestion is to use the F-factor for proposed design, using table A6.3 of Ashrae?