Heating Example - Fujitsu AOU48RLXFZ Design & Technical Manual

3-2-2.

HEATING EXAMPLE

EXAMPLE 3
Outdoor unit
Indoor unit 1
Room 1
Design conditions
Design temperature
●
Indoor : 65°F DB (18.3°C DB)
Outdoor : 50°F DB / 47°F WB (10.0°C DB / 8.3°C WB)
Pipe length
●
Main piping length : L1=32.8ft. (10m)
Branch piping length : L2=32.8ft. (10m)
Operation mode: Heating
●
Selection of indoor unit
A-1 Heating heat load
A-2 Indoor unit models
A-3 Rated capacity (TC )
in r
A-4 Total rated capacity ∑(TC )
in
Connecting indoor unit
A-5
capacity (Cp)
Capacity change rate by
A-6 suction temperature of
indoor unit
Total capacity at design
A-7
temperature ∑(TC )
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 Compensation coefficient of pipe length
B-6 Capacity change rate by frosting
B-7 Maximum capacity of outdoor unit (TC
Decide system capacity
C-1 System capacity
Calculate actual capacity of each indoor unit
Actual capacity of each indoor
Btu
unit
Actual capacity of all indoor units is larger than heating heat load of each room.
(When the connecting capacity for indoor unit is 100% or more)
Main Piping length, L1=32.8ft. (10m)
Branch
box
Indoor unit 2 Indoor unit 3
Room 2 Room 3
Room 1 Room 2 Room 3
Btu 8000 8000 8000
ASU7 ASU7 ASU7
Btu 8100 8100 8100
Btu
r
Btu
Btu
) Btu
out c
Room 1 Room 2 Room 3
8220 8220 8220
- (02 - 09) -
Branch Piping length, L1=32.8ft. (10m)
Branch
box
Indoor unit 4 Indoor unit 5 Indoor unit 6
Room 4 Room 5 Room 6
Room 4 Room 5 Room 6
8000 8000 8000
ASU7 ASU7 ASU7
8100 8100 8100
8100 x 8 = 64800
64800 / 54000 = 120%
59.4 / 54.0 = 1.10
64800 x 1.10 = 71280
AOU48RLXFZ
54000
59.7 / 54.0 = 1.106
62.1 / 54.0 = 1.15
0.996 x 0.962 = 0.958
1.00
54000 x 1.106 x1.15 x 0.958 x1.00 =
65800
Btu 65800
Room 4 Room 5 Room 6 Room 7
8220 8220 8220 8220
Branch
box
Indoor unit 7 Indoor unit 8
Room 7 Room 8
Remark
Room 7 Room 8
8000 8000
ASU7 ASU7
8100 8100
Heating
Sum of A-3
See Fig.3
(A-4) x (A-6)
Remark
Heating
See Fig.3
See Fig.4
See 5-1.
See 5-2.
(B-2) x (B-3) x (B-4) x (B-5) x
(B-6)
Remark
Smaller one of (A-7)
and (B-7)
Room 8 Remark
8220 (A-3) x (C-1) / (A-4)
2. MODEL SELECTION