In ASHRAE 90.1 Table 6.5.6.1 - Exhaust Energy Recovery Requirement where they mention % Outdoor Air at Full Design Airflow Rate are they referring to the "minimum outdoor air" value ? The outdoor airflow rate will vary with the economiser. So is it the minimum value we should to use and compare this to the design flowrate. ??
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Tyler Thumma
7GroupLEEDuser Expert
60 thumbs up
September 12, 2019 - 7:27 pm
Based on the title of your question I'm assuming you're asking about when energy recovery is required in the Baseline model, not the Proposed design. The % Outdoor Air would be calculated as (Baseline minimum outdoor airflow calculated per G3.1.2.6) / (Baseline full design airflow rate calculated per G3.1.2.9). You would not use the outdoor airflow in economizer operation to determine whether energy recovery is required.