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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 10HP outdoor units: AJ 090LELAH
Outdoor
Total rated
temperature
cooling capacity
18°CDB / 14 °CWB
of indoor unit
(°CDB)
TC
IP
-15
17.7
3.88
.
.
.
.
.
.
30.8
(110%)
35
17.7
5.07
.
.
.
X
2
46
17.7
6.67
-15
16.1
3.54
.
.
.
.
.
.
28.0
(100%)
35
16.1
4.63
.
.
.
X
1
46
16.1
5.92
Capacity ratio of indoor units to outdoor unit
Capacity of outdoor units (kW)
Y= (29.3-28.6) / (110-100) (104.3-100) + 28.6 = 28.9 (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
30.8
6.62
33.4
7.17
35.1
.
.
.
.
.
.
.
.
.
.
28.7
8.63
29.3
8.67
30.6
.
.
.
.
.
Y
2
20.0
6.70
20.5
6.70
21.4
28.0
6.03
30.4
6.53
34.0
.
.
.
.
.
.
.
.
.
.
28.0
8.59
28.6
8.63
29.9
.
.
.
.
.
Y
1
19.7
6.73
20.2
6.73
21.1
- (02 - 13) -
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
7.17
35.9
7.16
.
.
.
.
.
.
8.74
31.3
8.78
.
.
.
6.70
21.8
6.70
7.18
34.8
7.17
.
.
.
.
.
.
8.70
30.5
8.73
.
.
.
6.73
21.5
6.73
X1 = 100 % X = 104.3 % X2 = 110 %
Y1 = 28.6
Y
and Y
1
2
) + Y
1
1
Y2 = 29.3
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