Design
D - 18
b) Calculating L
U
Calculating the necessary passage area S(m
2
)
(calculated on the basis that the air flow speed between units or rows is a standard 1.5m/s)
Calculation of the passage area Sa(m
2
)
■For an installation on concrete foundation
Sa=[(U
H
+H)×La+0.25La
2
]×2(N-1)
■For a cat walk installation
Sa=[(U
H
+H)×La+0.25La
2
]×2(N-1)+2N×U
W
×H
U
+2M×U
D
×H
U
•here air flow to a cat walk is obstructed by a wall
Calculation of the distance between rows ‚ku
■For a concrete foundation installation
■For a cat walk installation
S=
Q×N×(M-1)
90
5. Criteria for positioning the outdoor unit
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