3-3. THE EXAMPLE OF CALCULATION
Fig.1 Outline of the system
z
Selection of indoor unit
Room 1 Room 2 Room 3 Room 4 Room 5
Remark
A-1 Cooling heat load kBtu/h 10.6 10.6 10.6 8.4 6.5
A-2 Indoor unit models AUUA12 AUUA12 AUUA12 AUUA9 AUUA7
A-3 Rated capacity (TC
in
)
r
kBtu/h 12.0 12.0 12.0 9.5 7.5
See section 7
A-4 Capacity at design temperature (TC
in
)
d
kBtu/h 12.6 12.6 12.6 9.9 7.8
See section 7
A-5 Compensation coecient of pipe length 0.86
See section 6
A-6 Estimated capacity of indoor unit (TC
in
)
e
kBtu/h 151.2 151.2 151.2 94.1 58.5
(A-4) x (A-5)
A-7 Total rated capacity ∑(TC
in
)
r
kBtu/h 53.0
Sum of A-3
A-8 Total capacity at design temperature ∑(TC
in
)
d
kBtu/h 55.5
Sum of A-4
z
Preliminary selection of outdoor unit
Remark
B-1 Outdoor unit model 5ton : AOU60RLAVM
B-2 Rated capacity (TC
out
)
r
kBtu/h 60.0
See section 2
B-3
Total rated capacity of indoor unit / Rated capacity of outdoor unit
∑(TC
in
)
r
/ (TC
out
)
r
% 88.3
(A-7) / (B-2)
B-4 Capacity at design temperature (TC
out
)
d
kBtu/h 55.4
See Fig.2
B-5 Compensation coecient of pipe length 0.86
See section 6
B-6 Compensated capacity of outdoor unit (TC
out
)
c
kBtu/h 47.7
(B-4) x (B-5)
z
Decide system capacity
Remark
C-1 System capacity kBtu/h 47.7
Smaller one of
(A-8) and (B-6)
z
Calculate actual capacity of each indoor unit
Room 1 Room 2 Room 3 Room 4 Room 5
Remark
Actual capacity of each indoor unit kBtu/h 10.8 10.8 10.8 8.6 6.8
(C-1) x (A-3) / (A-7)
Outdoor
unit
Indoor
unit 1
Indoor
unit 2
Indoor
unit 3
Indoor
unit 4
Indoor
unit 5
Room 1 Room 2 Room 3 Room 4 Room 5
Pipe length, L=229 ft. (70 m)
Height dierence, H=65 ft. (20 m)
Design conditions:
● Temperature
Indoor : 82°FDB / 68°FWB
(28°CDB / 20°CWB)
Outdoor : 95°FDB
(35°CDB)
● Pipe length : 229 ft. (70 m)
● Height difference : 66 ft. (20 m)
(Outdoor unit upper side)
- (02 - 10) -
MODEL
SELECTION
MODEL
SELECTION
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