Fujitsu AIRSTAGE V-II - Page 43

1) Equation for capacity calculation of outdoor unit.
2) Cooling capacity table of 22HP outdoor units: AJ

198LALH(AJ

108LALH + AJ

A90LALH)
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 PI TC PI TC PI TC PI TC PI
67.7
(110%)
10 44.4 6.74 67.6 9.87 73.3 10.64 84.8 12.96 88.5 13.77
. . . . . . . . . . .
. . . . . . . . . . .
35 44.4 10.92 6 7. 6 20.27 69.6 20.86 72.3 21.21 73.6 21.39
. . . . . . . . . . .
46 44.4 15.57 61.7 24.75 62.9 24.93 65.5 25.29 66.7 25.47
61.5
(100%)
10 40.4 6.19 61.5 9.03 66.6 9.74 77.1 11.16 82.4 12.32
. . . . . . . . . . .
. . . . . . . . . . .
35 40.4 9.67 61.5 17.3 5 66.6 19.83 70.6 20.99 71.9 21.17
. . . . . . . . . . .
46 40.4 13.65 60.4 24.55 61.5 24.73 6 4.1 25.09 65.3 25.26
Capacity ratio of indoor units to outdoor unit X1 = 100 % X = 108.5 % X2 = 110 %
Capacity of outdoor units (kW) Y1 = 66.6 Y Y2 = 69.6
Y= (69.6-66.6) / (110-100)

(108.5-100) + 66.6 = 69.2 (kW)
3) Cooling capacity table of 24HP outdoor units: AJ

216LALH (AJ

108LALH + AJ

108LALH)
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 PI TC PI TC PI TC PI TC PI
67. 0
(100%)
10 44.0 6.92 67.0 10.06 72.6 10.84 84.0 12.40 89.8 13.68
. . . . . . . . . . .
. . . . . . . . . . .
35 44.0 10.76 67.0 19.24 72.6 21.98 7 7. 0 23.26 78.4 23.46
. . . . . . . . . . .
46 44.0 15 .16 65.8 2 7. 20 67. 0 27.40 69.8 2 7. 8 0 71.2 27.9 8
60.3
(90%)
10 39.6 6.32 60.2 9.14 65.4 9.84 75.6 11.26 80.8 11.96
. . . . . . . . . . .
. . . . . . . . . . .
35 39.6 9.48 60.2 16.36 65.4 18.54 74.8 22.98 76.2 23.18
. . . . . . . . . . .
46 39.6 13.22 60.2 23.80 65.4 27.14 68.0 27.5 4 69.2 2 7.72
Capacity ratio of indoor units to outdoor unit X1 = 90 % X = 99.6 % X2 = 100 %
Capacity of outdoor units (kW) Y1 = 65.4 Y Y2 = 72.6
Y= (72.6-65.4) / (100-90)

(99.6-90) + 65.4 = 72.3 (kW)
Fig.2 Method for calculation of capacity of outdoor unit from capacity tables
X
2
Y
2
X
1
Y
1
X
2
Y
2
X
1
Y
1
(X
1
, Y
1
)
(X
2
, Y
2
)
(X, Y)
x
y
i) Refer to 2-4. 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-X1) + Y
1
Capacity ratio of indoor units to outdoor unit, X (%)
Capacity of outdoor unit, Y (kW )
- (02 - 11) -
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