Robby,
Joe may have been implying that he used different settings for MIN-OA-METHOD between the baseline and proposed models. Presumably, FRACTION-OF-DESIGN for Proposed and FRACTION-OF-HOURLY for the Baseline, which would actually penalize the Proposed if I understand the methods correctly. My understanding is that FRACTION-OF-DESIGN should be used in both the Baseline and Proposed models to meet the intent of ASHRAE 62.1. FRACTION-OF-HOURLY should decrease the OA CFM as the VAV flow decreases, resulting in a decreased ventilation rate at lower supply flows.
Regards,
Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
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