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3-3.
THE EXAMPLE OF CALCULATION
EXAMPLE 1
„
„
Fig.1 Outline of the system
Outdoor
Selection of indoor unit
z
„
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
Preliminary selection of outdoor unit
z
„
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
Decide system capacity
z
„
C-1 System capacity
Calculate actual capacity of each indoor unit
z
„
Actual capacity of each indoor unit
unit
Pipe length, L=70m
Indoor
Indoor
unit 1
unit 2
Room 1
Room 2
Room 3
Room 1
kW
3.0
AUXB12
kW
3.6
)
kW
3.9
in
d
)
kW
3.4
in
e
)
kW
in
r
)
kW
in
d
)
out
d
)
out
c
Room 1
kW
3.2
- (02 - 09) -
Design conditions:
●
Temperature
●
Pipe length : 70m
●
Height difference : 20m
(Outdoor unit upper side)
Indoor
Indoor
Indoor
unit 3
unit 4
unit 5
Room 4
Room 5
Room 2
Room 3
3.0
3.0
AUXB12
AUXB12
3.6
3.6
3.9
3.9
0.86
3.4
3.4
15.8
17.1
5HP : AJ A45LALH
kW
%
kW
kW
kW
Room 2
Room 3
3.2
3.2
Indoor
: 28°CDB / 20°CWB
Outdoor : 35°CDB
Room 4
Room 5
Remark
2.0
1.5
AUXB09
AUXB07
2.8
2.2
See 7
3.0
2.4
See 7
See 6
2.6
2.1
(A-4) x (A-5)
Sum of A-3
Sum of A-4
Remark
14.0
See 2
112.9
(A-7) / (B-2)
16.2
See Fig.2 2)
0.86
See 6
13.9
(B-4) x (B-5)
Remark
Smaller one of
13.9
(A-8) and (B-6)
Room 4
Room 5
Remark
2.5
1.9
(C-1) x (A-3) / (A-7)
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