Sanyo SGP-EW120M2G2W Technical Data Manual page 52

System Design
b) Calculating L
Calculating necessary passage area S (m
(calculated on the basis that the airflow between units or rows is a standard 1.5 m/s)
Qm×N×(M-1)
S=
Calculation of actual passage area Sa (m
• For installations on concrete pads
Sa = [(U
• For installations on catwalks
Sa = [(U
In this example, airflow to the catwalk is obstructed by a wall
U
H
H
U
Calculation of Lu, the distance between rows
■ For installations on concrete pads
Lu=
■ For installations on catwalks
Catwalk
Lu=
U
90
2
+ H) × La + 0.25La ] × 2(N - 1)
H
2
+ H) × La + 0.25La ] × 2(N - 1) + 2N × U
H
L
W
Wall
Catwalk
2
- (U +H) + (U +H) +(S-Sa) / [2(M-1)]
H H
0.5
Airflow
(S-Sa)+(U × U × N × (M-1)
W D
[U × N+La × (N-1)] × (M-1)
W
5. Outdoor unit positioning requirements
2
)
Total outdoor unit airflow (m
Qm=
No. of outdoor units
2
)
× H
W
In the diagram at the left, if L
to the catwalk is obstructed. Airflow from the wall
side should be assumed to be zero.
In the above formula, the second parameter is
obtained from the area of air inflow from Wall1
and Wall3 sides, and the third parameter is
obtained from the air inflow area from the Wall2
and Wall4 sides.
When L > U
W H
formulae.
As shown in the diagram at the left, obtain Lu from
the formula below by considering airflow from the
bottom of the unit. However, if L
the same as for concrete pads.
-U
D
D-21
3
/min)
+ 2M × U × H
U D U
≤ U
+ H
W H
+ H , obtain Sa from the above
U
≤ U
+ H
W H
, airflow
U
, Lu is
U