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7
Selection procedure
7-1
Selection procedure
1
7-1-4
Selection example based on cooling load
7
4
Actual performance data (50Hz)
•
Outdoor unit cooling capacity: 30.5kW (RXYQ10M, 110 %)
•
Individual capacity
Capacity of FXYCP25K
Capacity of FXYCP40K7 = 30.5 x
Actual combination capacity
Room
Load (kW)
2.9
Unit size
25
Capacity
2.77
The unit size for room A has to be increased from 25 to 32 because the capacity is less than the load. For new combination, actual capacity is calculated
as follows.
•
Indoor unit combination total capacity index
(25 x 2) +31.25 + (40 x5) = 281.25 (112.5 %)
•
Outdoor unit cooling capacity:
27,610 kcal/h (direct interpolation between 110 % and 120 % in the table)
•
Individual capacity
Capacity of FXCQ25M
Capacity of FXCQ32M
Capacity of FXCQ40M
Actual capacity of new combination
Room
Load (kW)
2.9
Unit size
32
Capacity
3.4
Then, the capacities have to be corrected for actual piping length according to the location of indoor and outdoor units and the distance between them.
28
• Introduction
System based on cooling load
25
= 30.5 x
= 2.77kW
275
40
= 4.44kW
275
A
B
2.7
25
2.77
25
= 30.0 x
= 2.7kW
281.25
32
= 30.0 x
= 3.4kW
281.25
40
= 30.0 x
= 4.3kW
281.25
A
B
2.7
25
2.7
•
Systems • Introduction
C
D
2.5
4.3
25
40
2.77
4.44
C
D
2.5
4.3
25
40
2.7
4.3
E
F
4.0
4.0
40
40
4.44
4.44
E
F
4.0
4.0
40
40
4.3
4.3
G
H
3.9
4.2
40
40
4.44
4.44
G
H
3.9
4.2
40
40
4.3
4.3
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