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1) Equation for capacity calculation of outdoor unit.
y
(X
, Y
)
1
1
Capacity ratio of indoor units to outdoor unit, X (%)
2) Cooling capacity table of 6HP outdoor units: AJ A54LALH
Outdoor
Total rated
temperature
cooling capacity
20°CDB / 15 °CWB
of indoor unit
(°CDB)
TC
IP
10
11.2
2.04
.
.
.
.
.
.
16.8
(110%)
35
11.2
2.98
.
.
.
X
2
46
11.2
4.05
10
10.2
1.87
.
.
.
.
.
.
15.4
(100%)
35
10.2
2.66
.
.
.
X
1
46
10.2
3.60
Capacity ratio of indoor units to outdoor unit
Capacity of outdoor units (kW)
Y= (16.8-16.4) / (110-100) (100.6-100) + 16.4 = 16.4 (kW)
Fig.2 Method for calculation of capacity of outdoor unit from capacity tables
(X
, Y
2
(X, Y)
Indoor temperature
27°CDB / 19 °CWB
28°CDB / 20 °CWB
30°CDB / 22 °CWB
TC
IP
TC
IP
TC
17.1
3.03
18.5
3.27
19.7
.
.
.
.
.
.
.
.
.
.
16.5
4.79
16.8
4.83
17.5
.
.
.
.
.
Y
2
12.3
4.50
12.5
4.50
13.0
15.5
2.77
16.8
2.99
19.2
.
.
.
.
.
.
.
.
.
.
15.5
4.49
16.4
4.79
17.1
.
.
.
.
.
Y
1
12.2
4.50
12.4
4.50
12.9
- (02 - 12) -
i) Refer to 4. CAPACIYY TABLE
(OUTDOOR UNIT) to find Y
using X
and X
.
1
2
ii) Calculate capacity of outdoor unit using
)
2
following equation:
Y=(Y
-Y
) / (X
-X
) (X-X
2
1
2
1
x
32°CDB / 23 °CWB
IP
TC
IP
3.41
20.1
3.43
.
.
.
.
.
.
4.90
17.9
4.94
.
.
.
4.50
13.3
4.50
3.38
19.6
3.40
.
.
.
.
.
.
4.86
17.5
4.90
.
.
.
4.50
13.1
4.50
X1 = 100 % X = 100.6 % X2 = 110 %
Y1 = 16.4
Y
and Y
1
2
) + Y
1
1
Y2 = 16.8
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