Selection Procedures - Daikin VAM Series Engineering Data

Product Introduction
1.4

Selection Procedures

Various methods are used to calculate the required ventilating airflow rate according to CO
waste gas generated by use of fire, and other conditions of a room.
Here are 2 patterns of calculating methods.
1.4.1 Based on Breathing Zones
The outdoor airflow required in the breathing zone (Vbz) of the occupiable space or spaces in a ventilation zone shall be not less
than the value determined in accordance with Equation 1.
Vbz = Rp × Pz + Ra × Az
where
Az = zone floor area, the net occupiable floor area of the ventilation zone, ft² (m²)
Pz = zone population, the number of people in the ventilation zone during use
Rp = outdoor airflow rate required per person as determined from Table 1
Ra = outdoor airflow rate required per unit area as determined from Table 1
The above equation conforms to ASHRAE Standard 62.1-2019
Notes:
1. Equation 1 accounts for people-related sources and area-related sources independently in the determination of the outdoor air
rate required at the breathing zone. The use of Equation 1 in the context of this standard does not necessarily imply that simple
addition of outdoor airflow rates for different sources can be applied to any other aspect of IAQ.
2. Design zone population (Pz) shall equal the largest (peak) number of people expected to occupy the ventilation zone during
typical use.
(Selection example)
Place: Break rooms
Outdoor air flow rate required per person: 5 cfm/person
Outdoor air flow rate required per unit area: 0.06 cfm/ft²
Zone population: 17
Zone floor area: 20 ft²
Required ventilating airflow rate = 5 × 17 + 0.06 × 20 = 86.2 cfm = 146 m³/h
Conversion:
1 L/s = 3.6 m³/h
1 cfm = 1.699 m³/h
Required ventilating airflow rate and the unit size such as 150, 250, 350 .......2000 are almost equal. So select the close size of the
unit.
In this case, select VAM150HVE/HVLT
16
(1)
EDMMT712101
generated by inhabitants in a room,
2
VAM-HVE/HVLT Series