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System Design
[2] Determining row length L
1) Calculating row length L
Obtain the row length from the following formula. (Refer to paragraph (5)-[1] for descriptions of
parameters.)
L
=U
×N+La×(N-1)
N
W
2) Calculating depth of outside of installation L
L
=U
×M+Lu×(M-1)
M
D
Note: If L
and L
N
•
Change the units per row or La, and rearrange
•
Increase the height of pads or catwalks
•
Install exhaust ducts
•
Change from pads to catwalk mounts
[3] Providing area for air inflow
1) Calculate necessary inflow area Sr
Procedure:
2) Calculate the area of air inflow from surroundings
a) Calculate effective inflow height Hwe
1. Walls the permit air passage (incl. no wall)
2. Walls that block air passage
b) Calculate effective inflow length Le
c) Calculate effective inflow area Se (= Hwe × Le)
3) Determine inflow area
1) Calculate necessary inflow area Sr
Obtain the necessary air inflow area Sr (m
the following formula.
(Sr is the minimum area necessary to avoid degrading system performance.)
Sr= (U
×N
S1
where
Sr = necessary inflow area (m
U
= necessary inflow area per outdoor unit (m
S1
N
= total number of outdoor units installed
T1
Note: When an air exhaust duct is used, take steps to prevent engine exhaust gas from entering the
heat exchanger, such as extending the exhaust pipe to the same height as the air exhaust duct.
and depth of outside of installation L
N
N
are unsuitable, perform one or more of the following, and recalculate.
M
↓
)
T1
Necessary air inflow are per outdoor unit (U
13 HP
16 HP
12.7
12.7
5. Outdoor unit positioning requirements
M
M
2
) to outdoor units in a combined installation from
2
)
2
) (see table below)
20 HP
12.7
D-22
Return to paragraph (5) -[1]
2
) [m
]
S1
25 HP
12.7
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