My Project is Having one FAHU on roof which is supplying treated Fresh air to all AHU"s, which further supplying the mixture of outdoor air and Recirculated air to various zone via VAV (no reheating, no recirculating fan) unit and this air (-Extract) is returning back to same AHU after serving to room load, so what should be my zone secondary recirculation fraction and what would be my zone primary air flow whether it would be same as zone discharge air flow or I need to consider the primary air flow value as (0.3*Vdz) if my minimum VAV flow setpoint is 30%.
In calculator Vpz is mentioned as lowest primary airflow value expected at the designed condition, What is mean by these?