Sanyo SGP-E120J2GU2, User Manual

Page: 63 / 175

Design
D - 19
H U
H
H
u
H
t
blow out
(Note)
Determining the row length L
N
and the external dimension of the unit installation
‚k
M
.
1)Calculating the row length L
N
Obtain the row length L
N
(m) from the following formula. (refer to item
5
- for each parameter)
L
N
=U
W
×N+La×(N-1)
2)Calculating the external dimension of the unit installation L
M
L
M
=U
D
×M+Lu×(M-1)
*If L
N
, L
M
are not appropriate dimensions, carry out the following and re-calculate.
•Change the no. of units in a row or La and re-arrange
•Make the upstand height higher
•Install a blow out duct
•change the foundations to a cat walk.
Providing area for air inflow
Procedure
1) Calculate the necessary draw-in area Sr
2) Calculate the area of air drawn-in from the surroundings
a) Calculate the effective draw-in height Hwe
1. Walls that air can pass through (including the case of no wall)
2. Walls that do not allow air to pass through
b) Calculate the effective draw-in length Le
c) Calculate the effective draw-in area from Se(=Hwe×Le)
3) Determine the draw-in area
1) Calculate the necessary draw-in area Sr
The necessary draw-in area Sr(m 2 ) for inflow of air to outdoor units in a combined installation is obtained from the
following formula.
(This Sr is the minimum area needed so that there is no obstruction to operation of the system.)
Sr=
Σ
(U
S1
×N
T1
)
here Sr : necessary draw-in area (m
2
)
U
S1
: necessary draw-in area per unit (m 2 ) (see the table below)
N
T1
: total number of units in the installation
refer to
5
-
Note) When a blow out duct is used, in order that the exhaust gas from
the engine is not sucked into the heat exchanger, extend the exhaust pipe
to the same height as the blow out duct, and other measures.
2) Calculate the area of inflow air from the surroundings
Calculate the effective inflow area, taking into account the effect of surrounding walls.
a) Calculation of the effective inflow height Hwe
The method of calculation depends upon the type of wall. Louvers will allow the air to pass, and sound proofing
walls will not pass, and these are the two types of case that must be considered.
i) Walls that allow passage of air (including the case of no wall)
■
From the following formula, calculate the height of inflow for each wall Ha
1•2•3•4
(m).
Ha= Lw+Hu+1.5×Ht+U
H
Here, Ha: inflow height (m)
L
W
: distance from the wall surface to the nearest outdoor unit (m)
However, when there is no wall L
W
=6.
(refer to item
5
- -1) for details of U
H
5. Criteria for positioning the outdoor unit