The 90.1-2010 User's Manual states:
"In some cases, a complete HVAC system already exists (...) the proposed building and baseline building models are the same and are based on the existing HVAC system".
Is that statement valid also for the ventilation air flow rates (i.e., is exception c. of G3.1.2.6 not valid?)?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
May 10, 2017 - 9:26 am
That is correct if the existing system remains unchanged. The existing system is modeled identically. It must, however, also comply with ASHRAE 62,1. So if is does not comply it must be modified to do so. If it is modified then G3..1.2.6 (c) is valid.