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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 5Ton outdoor units: AOU60RLAVM
Outdoor
Total rated
temperature
cooling capacity
68 °FDB 59 °FWB
of indoor unit
(°FDB)
TC
IP
5
34.2
2.04
.
.
.
.
.
.
54.0
(90%)
95
34.2
2.77
.
.
.
X
2
115
34.2
3.72
5
30.4
1.84
.
.
.
.
.
.
48.0
(80%)
95
30.4
2.44
.
.
.
X
1
115
30.4
3.26
Capacity ratio of indoor units to outdoor unit
Capacity of outdoor units (kBtu/h)
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
, Y
2
(X, Y)
Indoor temperature
80 °FDB 67 °FWB
82 °FDB 68 °FWB
86 °FDB 72 °FWB
TC
IP
TC
IP
TC
54.0
3.06
56.5
3.19
66.4
.
.
.
.
.
.
.
.
.
.
54.0
4.73
56.5
5.01
63.9
.
.
.
.
.
Y
2
48.7
5.40
48.7
5.40
50.8
48.0
2.75
50.2
2.87
59.0
.
.
.
.
.
.
.
.
.
.
48.0
4.09
50.2
4.32
59.0
.
.
.
.
.
Y
1
46.9
5.40
47.1
5.40
47.8
- (02 - 11) -
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
90 °FDB 73 °FWB
IP
TC
IP
3.71
68.8
3.84
.
.
.
.
.
.
5.80
64.6
5.82
.
.
.
5.40
51.3
5.40
3.32
61.2
3.44
.
.
.
.
.
.
5.30
61.2
5.56
.
.
.
5.40
48.3
5.40
X1 = 110 %
X = 88.3 %
Y1 = 16.1
Y
and Y
1
2
) + Y
1
1
X2 = 120 %
Y2 = 16.4
- Quick Links:
- Outdoor Unit
- Indoor Unit
- Controller
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