The Example Of Calculation - Fujitsu Airstage J-II Series Design & Technical Manual

3-3. THE EXAMPLE OF CALCULATION

Fig.1 Outline of the system
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
Outdoor
unit
Pipe length, L=229 ft. (70 m)
Indoor Indoor
unit 1 unit 2
Room 1 Room 2
Room 1
kBtu/h 10.6
AUUA12
kBtu/h 12.0
) kBtu/h 12.6
in d
) kBtu/h 151.2
in e
) kBtu/h
in r
) kBtu/h
in d
)
out d
)
out c
Room 1
kBtu/h 10.8
- (02 - 10) -
Design conditions:
● Temperature
● Pipe length : 229 ft. (70 m)
● Height difference : 66 ft. (20 m)
(Outdoor unit upper side)
Indoor Indoor Indoor
unit 3 unit 4 unit 5
Room 3 Room 4 Room 5
Room 2 Room 3
10.6 10.6
AUUA12 AUUA12
12.0 12.0
12.6 12.6
0.86
151.2 151.2
53.0
55.5
5ton : AOU60RLAVM
kBtu/h
%
kBtu/h
kBtu/h
kBtu/h
Room 2 Room 3 Room 4
10.8 10.8
Indoor : 82°FDB / 68°FWB
(28°CDB / 20°CWB)
Outdoor : 95°FDB
(35°CDB)
Room 4 Room 5 Remark
8.4 6.5
AUUA9 AUUA7
9.5 7.5 See section 7
9.9 7.8
See section 7
See section 6
94.1 58.5 (A-4) x (A-5)
Sum of A-3
Sum of A-4
Remark
60.0
See section 2
88.3
(A-7) / (B-2)
55.4
See Fig.2
0.86
See section 6
47.7
(B-4) x (B-5)
Remark
Smaller one of
47.7
(A-8) and (B-6)
Room 5 Remark
8.6 6.8 (C-1) x (A-3) / (A-7)