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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 5HP outdoor units: AJ A45LALH
Outdoor
Total rated
temperature
cooling capacity
20°CDB / 15 °CWB
of indoor unit
(°CDB)
TC
IP
10
11.1
1.91
.
.
.
.
.
.
16.8
(120%)
35
11.1
2.87
.
.
.
X
2
46
11.1
3.91
10
11.5
1.98
.
.
.
.
.
.
15.4
(110%)
35
11.5
3.00
.
.
.
X
1
46
11.5
4.09
Capacity ratio of indoor units to outdoor unit
Capacity of outdoor units (kW)
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
, Y
2
(X, Y)
Indoor temperature
27°CDB / 19 °CWB
28°CDB / 20 °CWB
30°CDB / 22 °CWB
TC
IP
TC
IP
TC
16.8
2.85
18.2
3.08
19.4
.
.
.
.
.
.
.
.
.
.
16.1
4.61
16.4
4.65
17.1
.
.
.
.
.
Y
2
12.0
4.50
12.3
4.50
12.8
15.4
2.62
16.7
2.83
19.0
.
.
.
.
.
.
.
.
.
.
15.4
4.41
16.1
4.61
16.7
.
.
.
.
.
Y
1
11.8
4.50
12.1
4.50
12.5
- (02 - 10) -
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
3.20
19.8
3.22
.
.
.
.
.
.
4.73
17.5
4.78
.
.
.
4.50
13.2
4.50
3.18
19.4
3.20
.
.
.
.
.
.
4.69
17.1
4.73
.
.
.
4.50
13.0
4.50
X1 = 110 %
X = 112.9 % X2 = 120 %
Y1 = 16.1
Y
and Y
1
2
) + Y
1
1
Y2 = 16.4
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