Fujitsu AIRSTAGE J-III L AJ 072LELAH Series Design & Technical Manual page 34

„ EXAMPLE 2
„
Fig.1 Outline of the system
Outdoor
z Selection of indoor unit
„
A-1 Cooling heat load
A-2 Indoor unit models
A-3 Rated capacity (TC )
in r
A-4 Capacity at design temperature (TC
A-5 Compensation coefficient of pipe length
A-6 Estimated capacity of indoor unit (TC
A-7 Total rated capacity ∑(TC
A-8 Total capacity at design temperature ∑(TC
z Preliminary selection of outdoor unit
„
B-1 Outdoor unit model
B-2 Rated capacity (TC )
out r
Total rated capacity of indoor unit / Rated capacity of outdoor unit
B-3
∑(TC ) / (TC )
in r out r
B-4 Capacity at design temperature (TC
B-5 Compensation coefficient of pipe length
B-6 Compensated capacity of outdoor unit (TC
z Decide system capacity
„
C-1 System capacity
z Calculate actual capacity of each indoor unit
„
Actual capacity of each indoor unit
unit
Pipe length, L=75m
Indoor Indoor
unit 1 unit 2
Room 1 Room 2 Room 3
Room 1
kW 7.5
AUXK30
kW 9.0
) kW 9.7
in d
) kW 8.7
in e
) kW
in r
) kW
in d
)
out d
)
out c
Room 1
kW 8.0
- (02 - 12) -
Design conditions:
● Temperature
● Pipe length : 75m
● Height difference : 20m
(Outdoor unit upper side)
Indoor Indoor Indoor
unit 3 unit 4 unit 5
Room 4 Room 5
Room 2 Room 3
7.5 7.5
AUXK30 AUXK30
9.0 9.0
9.7 9.7
0.90
8.7 8.7
29.2
31.5
10HP : AJ  090LELAH
kW
%
kW
kW
kW
Room 2 Room 3
8.0 8.0
Indoor : 28°CDB / 20°CWB
Outdoor : 35°CDB
Room 4 Room 5 Remark
0.8 0.8
AUXB04 AUXB04
1.1 1.1
See 7
1.2 1.2 See 7
See 6
1.1 1.1
(A-4) x (A-5)
Sum of A-3
Sum of A-4
Remark
28.0
See 2
104.3
(A-7) / (B-2)
28.9
See Fig.2 2)
0.90
See 6
26.0
(B-4) x (B-5)
Remark
Smaller one of
26.0
(A-8) and (B-6)
Room 4 Room 5 Remark
1.0 1.0
(C-1) x (A-3) / (A-7)