2. MODEL SELECTION
THE EXAMPLE OF CALCULATION3-2.
COOLING EXAMPLE3-2-1.
EXAMPLE 1
(When the connecting capacity for indoor unit is 100% or more)
Branch
box
Branch
box
Branch
box
Outdoor unit
Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8
Room 1 Room 2 Room 3 Room 4 Room 5 Room 6 Room 7 Room 8
Main Piping length, L1=10m Branch Piping length, L2=10m
Design conditions
Design temperature
Indoor : 23°C DB / 16°C WB
Outdoor : 30°C DB
Pipe length
Main piping length : L1=10m
Branch piping length : L2=10m
Operation mode: Cooling
Selection of indoor unit
Room 1 Room 2 Room 3 Room 4 Room 5 Room 6 Room 7 Room 8
Remark
A-1 Cooling heat load kW 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7
A-2 Indoor unit models
AS07 AS07 AS07 AS07 AS07 AS07 AS07 AS07
A-3 Rated capacity (TC
in
)
r
kW 2.05 2.05 2.05 2.05 2.05 2.05 2.05 2.05
Cooling
A-4 i (
in
)
r
kW 2.05 x 8 =16.4
Sum of A-3
A-5
Connecting indoor unit
capacity (Cp)
1. / 1. 117 (1)
A-6
Capacity at design
temperature (TC
in
)
d
kW 1.78 1.78 1.78 1.78 1.78 1.78 1.78 1.78
See 6-1.
A-7
Total capacity at design
m (
in
)
d
kW 1.78 x 8 = 14.2
Sum of A-6
Calculate the Maximum capacity of outdoor unit
Remark
B-1 Outdoor unit model AO
G45LBT8
B-2 Rated capacity (TC
out
)
r
kW 14.0
Cooling
B-3 Capacity change rate by temperature conditions 13.9 / 14.0 = 0.993
Se e Fi g.1
B-4 Capacity change rate by indoor units connecting capacity kW 15.4
See Fig.2
B-5 mnin in i n 0.98 x 0.942 = 0.923
See 5-1.
B-6 Maximum capacity of outdoor unit (TC
out
)
c
kW 15.4 x 0.993 x 0.923 = 14.1
(B-4) x (B-3) x (B-5)
Decide system capacity
Remark
C-1 System capacity kW 14.1
Smaller one of (A-7)
and (B-6)
Calculate actual capacity of each indoor unit
Room 1 Room 2 Room 3 Room 4 Room 5 Room 6 Room 7 Room 8
Remark
Actual capacity of each indoor
unit
kW 1.76 1.76 1.76 1.76 1.76 1.76 1.76 1.76
(A3) x (C1) / (A4)
Actual capacity of all indoor units is larger than cooling heat load of each room.
- (02 - 05) -
MODEL
SELECTION
MODEL
SELECTION
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