Fujitsu Airstage UTY-RSRY - Page 51

1) Equation for capacity calculation of outdoor unit.
2) Cooling capacity table of 5Ton outdoor units: AOU60RLAVM
Total rated
cooling capacit y
of indoor unit
Outdoor
temperature
Indoor temperature
68 °FDB 59 °FWB 80 °FDB 67 °FWB 82 °FDB 68 °FWB 86 °FDB 72 °FWB 90 °FDB 73 °FWB
(°FDB) TC IP TC IP TC IP TC IP TC IP
54.0
(90%)
5
34.2 2.04 54.0 3.06 56.5 3 .19 66.4 3.71 68.8 3.84
.
. . . . . . . . . .
.
. . . . . . . . . .
95
34.2 2.77 54.0 4.73 56.5 5.01 63.9 5.80 64.6 5.82
.
. . . . . . . . . .
115
34.2 3.72 48.7 5.40 48.7 5.40 50.8 5.40 51.3 5.40
48.0
(80%)
5
30.4 1.84 48.0 2.75 50.2 2.87 59.0 3.32 61.2 3.44
.
. . . . . . . . . .
.
. . . . . . . . . .
95
30.4 2.44 48.0 4.09 50.2 4.32 59.0 5.30 61.2 5.56
.
. . . . . . . . . .
115
30.4 3.26 46.9 5.40 47.1 5.40 47.8 5.40 48.3 5.40
Capacity ratio of indoor units to outdoor unit X1 = 110 % X = 88.3 % X2 = 120 %
Capacity of outdoor units (kBtu/h) Y1 = 16.1 Y Y2 = 16.4
Y= (56.5-50.2) / (90-80)

(88.3-80) + 50.2 =
55.4 (kBtu/h)
Fig.2 Method for calculation of capacity of outdoor unit from capacity tables
X
2
Y
2
X
1
Y
1
(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 )
- (02 - 11) -
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