Design Technical Manual

3-3. THE EXAMPLE OF CALCULATION
Fig.1 Outline of the system
Outdoor
unit1
(Master)
Outdoor
unit2
(Slave)
Indoor
unit 1
Indoor
unit 2
Indoor
unit 3
Indoor
unit 4
Indoor
unit 5
Indoor
unit 6
Room 1
RB unit
Room 2 Room 3 Room 4 Room 5 Room 6
Pipe length, L=75m
Height difference, H=66ft. (20m)
Design conditions:
● Temperature
Indoor : 82°FDB / 68°FWB
(27.8°CDB / 20°CWB)
Outdoor : 95°FDB
(35°CDB)
● Pipe length : 246ft. (75m)
● Height difference : 66ft. (20m)
(Outdoor unit upper side)
z
Selection of indoor unit
Room 1 Room 2 Room 3 Room 4 Room 5 Room 6
Remark
A-1 Cooling heat load kBtu/h 33.0 33.0 33.0 27. 5 27.5 22.0
A-2 Indoor unit models AUUB36 AUUB36 AUUB36 AUUB30 AUUB30 AUUB24
A-3 Capacity of indoor unit (TC
in
)
r
kBtu/h 36.0 36.0 36.0 30.0 30.0 24.0
See 7
A-4 Capacity at design temperature (TC
in
)
d
kBtu/h 37.7 37.7 37.7 31.4 31.4 25.1
See 7
A-5 Compensation coefcient of pipe length 0.90
See 6
A-6 Estimated capacity of indoor unit (TC
in
)
e
kBtu/h 33.9 33.9 33.9 28.3 28.3 22.6
(A-4) x (A-5)
A-7 Total capacity of indoor unit ∑(TC
in
)
r
kBtu/h 192.0
Sum of A-3
A-8 Total capacity at design temperature ∑(TC
in
)
d
kBtu/h 201.0
Sum of A-4
z
Preliminary selection of outdoor unit
Remark
B-1 Outdoor unit model
14Ton : AOUA168TLBVG
(AOUA96TLBV + AOUA72TLBV)
B-2 Nominal capacity (TC
out
)
r
kBtu/h 168.0
See 2
B-3
Total capacity of indoor unit / Nominal capacity of outdoor unit
∑(TC
in
)
r
/ (TC
out
)
r
% 114.3
(A-7) / (B-2)
B-4 Capacity at design temperature (TC
out
)
d
kBtu/h 177.1
See Fig.2 2)
B-5 Compensation coefcient of pipe length 0.90
See 2-6
B-6 Compensated capacity of outdoor unit (TC
out
)
c
kBtu/h 159.4
(B-4) x (B-5)
z
Decide system capacity
Remark
C-1 System capacity kBtu/h 159.4
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 Room 6
Remark
Actual capacity of each indoor unit kBtu/h 29.9 29.9 29.9 24.9 24.9 19.9
(C-1) x (A-3) / (A-7)
- (02 - 10) -
MODEL SELECTION MODEL SELECTION