Fujitsu Airstage J-II - Page 37

1) Equation for capacity calculation of outdoor unit.
(X
1
, Y
1
)
(X
2
, Y
2
)
(X, Y)
x
y
i) Refer to 4. CAPACIYY TABLE
(OUTDOOR UNIT) to nd Y
1
and Y
2
using X
1
and X
2
.
ii) Calculate capacity of outdoor unit using
following equation:
Y=(Y
2
-Y
1
) / (X
2
-X
1
)

(X-X
1
) + Y
1
Capacity ratio of indoor units to outdoor unit, X (%)
Capacity of outdoor unit, Y (kW )
2) Cooling capacity table of 5HP outdoor units: AJ

A45LALH
Total rated
cooling capacity
of indoor unit
Outdoor
temperature
Indoor temperature
20°CDB / 15 °CWB 27°CDB / 19 °CWB 28°CDB / 20 °CWB 30°CDB / 22 °CWB 32°CDB / 23 °CWB
(°CDB) TC IP TC IP TC IP TC IP TC IP
16.8
(120%)
10
11.1 1.91 16.8 2.85 18.2 3.08 19.4 3.20 19.8 3.22
.
. . . . . . . . . .
.
. . . . . . . . . .
35
11.1 2.87 16.1 4.61 16.4 4.65 17.1 4.73 17. 5 4.78
.
. . . . . . . . . .
46
11.1 3.91 12.0 4.50 12.3 4.50 12.8 4.50 13.2 4.50
15.4
(110%)
10
11. 5 1.98 15.4 2.62 16.7 2.83 19.0 3.18 19.4 3.20
.
. . . . . . . . . .
.
. . . . . . . . . .
35
11. 5 3.00 15.4 4.41 16.1 4.61 16.7 4.69 17.1 4.73
.
. . . . . . . . . .
46
11. 5 4.09 11.8 4.50 12.1 4.50 12.5 4.50 13.0 4.50
Capacity ratio of indoor units to outdoor unit X1 = 110 % X = 112.9 % X2 = 120 %
Capacity of outdoor units (kW) Y1 = 16.1 Y Y2 = 16.4
Y= (16.4-16.1) / (120-110)

(112.9-110) + 16.1 =
16.2 (kW)
Fig.2 Method for calculation of capacity of outdoor unit from capacity tables
X
2
Y
2
X
1
Y
1
- (02 - 10) -
MODEL SELECTION MODEL SELECTION