• Introduction
1
7
•
Systems • Introduction
28
7
Selection procedure
7-1
Selection procedure
System based on cooling load
7-1-4
Selection example based on cooling load
4
Actual performance data (50Hz)
•
Outdoor unit cooling capacity: 30.5kW (RXYQ10M, 110 %)
•
Individual capacity
Capacity of FXYCP25K
= 30.5 x
25 = 2.77kW
275
Capacity of FXYCP40K7 = 30.5 x
40 = 4.44kW
275
Actual combination capacity
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
= 30.0 x
25
= 2.7kW
281.25
Capacity of FXCQ32M
= 30.0 x
32
= 3.4kW
281.25
Capacity of FXCQ40M
= 30.0 x
40
= 4.3kW
281.25
Actual capacity of new combination
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.
Room
A
B
C
D
E
F
G
H
Load (kW)
2.9
2.7
2.5
4.3
4.0
4.0
3.9
4.2
Unit size
25
25
25
40
40
40
40
40
Capacity
2.77
2.77
2.77
4.44
4.44
4.44
4.44
4.44
Room
A
B
C
D
E
F
G
H
Load (kW)
2.9
2.7
2.5
4.3
4.0
4.0
3.9
4.2
Unit size
32
25
25
40
40
40
40
40
Capacity
3.4
2.7
2.7
4.3
4.3
4.3
4.3
4.3
