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403.3.1.1.1.3 Zone outdoor airflow.
The zone outdoor airflow rate (V
oz
), shall be determined in accordance with Equation 4-2.
V
oz
= V
bz / E
z | (Equation 4-2) |
403.3.1.1.2 System outdoor airflow.
The outdoor air required to be supplied by each ventilation system shall be determined in accordance with Sections 403.3.1.1.2.1 through 403.3.1.1.2.3 as a function of system type and zone outdoor airflow rates.
403.3.1.1.2.1 Single zone systems.
Where one air handler supplies a mixture of outdoor air and recirculated return air to only one zone, the system outdoor air intake flow rate (Vot) shall be determined in accordance with Equation 4-3.
V
ot
= V
oz | (Equation 4-3) |
403.3.1.1.2.2 100-percent outdoor air systems.
Where one air handler supplies only outdoor air to one or more zones, the system outdoor air intake flow rate (Vot) shall be determined using Equation 4-4.
V
ot
=
Σall zones
V
oz | (Equation 4-4) |
403.3.1.1.2.3 Multiple zone recirculating systems.
Where one air handler supplies a mixture of outdoor air and recirculated return air to more than one zone, the system outdoor air intake flow rate (Vot) shall be determined in accordance with Sections 403.3.1.1.2.3.1 through 403.3.1.1.2.3.4.
403.3.1.1.2.3.1 Primary outdoor air fraction.
The primary outdoor air fraction (Z
p
) shall be determined for each zone in accordance with Equation 4-5.
Z
p
= V
oz / Vpz | (Equation 4-5) |
where:
Vpz | = | Primary airflow: The airflow rate supplied to the zone from the air-handling unit at which the outdoor air intake is located. It includes outdoor intake air and recirculated air from that air-handling unit but does not include air transferred or air recirculated to the zone by other means. For design purposes, Vpz
shall be the zone design primary airflow rate, except for zones with variable air volume supply and Vpz
shall be the lowest expected primary air-flow rate to the zone when it is fully occupied. |
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