Fujitsu AUYG07LVLA Design & Technical Manual page 25

EXAMPLE 2
Outdoor unit
Indoor unit 1
Room 1
Design conditions
Design temperature
Indoor : 23.0°C DB / 16.0°C WB
Outdoor : 30.0°C DB
Pipe length
Main piping length : L1=10m
Branch piping length : L2=10m
Operation mode: Cooling
Selection of indoor unit
A-1 Cooling heat load
A-2 Indoor unit models
A-3 Rated capacity (TC )
in r
A-4 i ( )
in r
Connecting indoor unit
A-5
capacity (Cp)
Capacity at design temperature
A-6
(TC )
in d
Total capacity at design
A-7
m ( )
in d
Calculate the Maximum capacity of outdoor unit
B-1 Outdoor unit model
B-2 Rated capacity (TC )
out r
B-3 Capacity change rate by temperature conditions
B-4 Capacity change rate by indoor units connecting capacity
B-5 m n i n i n
B-6 Maximum capacity of outdoor unit (TC
*1: When indoor units connecting capacity is 100% or less, rated capacity is used.
Decide system capacity
C-1 System capacity
Calculate actual capacity of each indoor unit
Actual capacity of each indoor
unit
Actual capacity of all indoor units is larger than cooling heat load of each room.
(When the connecting capacity for indoor unit is 100% or less)
Main Piping length, L1=10m
Branch Branch
box box
Indoor unit 2
Room 2
Room 1 Room 2
kW 2.2 2.2
AS09 AS09
kW 2.64 2.64
2.64 x 2 + 3.52 x 2 = 12.3
12. / 1 . 7.
kW 2.30 2.30
kW 2.30 x 2 +3.06 x 2 = 10.7
i n
)
out c
Room 1 Room 2 Room 3
kW 2.30 2.30 3.06
- (02 - 06) -
Branch Piping length, L2=10m
Indoor unit 3 Indoor unit 4
Room 3 Room 4
Room 3 Room 4
Remark
2.9 2.9
AS12 AS12
3.52 3.52
Cooling
Sum of A-3
( 1 )
3.06 3.06
See 6-1.
Sum of A-6
AO G45LBT8
kW 14.0
13.9 / 14.0 = 0.993
kW 14.0 *1
0.98 x 0.942 = 0.923
kW 14.0 x 0.993 x 0.923 = 12.8
kW
Room 4 Remark
3.06
(A3) x (C1) / (A4)
Remark
Cooling
See Fig.1
See 5-1.
(B-4) x (B-3) x (B-5)
Remark
Smaller one of (A-7)
10.7
and (B-6)
2. MODEL SELECTION