2-18
Design of W-2WAY ECO-i SYSTEM Unit Specifications
1
2
3
4
5
6
7
8
Indoor unit changes
The indoor unit in room 4, where the corrected indoor unit capacity is less than the maximum load, is increased by one rank.
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Selected model
Type 1405+0905
Type 604 Type 484 Type 484 Type 254
Maximum load
(cooling/heating) (kW)
15.0 / 16.5 13.0 / 14.5 13.0 / 14.5 5.5 / 6.2
Rated capacity
(cooling/heating) (kW)
73.0 / 81.5 16.0 / 18.0 14.0 / 16.0 14.0 / 16.0 7.30 / 8.00
(5) Corrected capacity
(cooling/heating) (kW)
59.36 / 58.45 16.00 / 18.00 14.00 / 16.00 13.42 / 15.69 6.82 / 7.71
(7) Actual capacity
(cooling/heating) (kW)
16.00 / 18.00 14.00 / 16.00 13.42 / 15.69 6.82 / 7.71
Total corrected capacity of all indoor units (cooling/heating) = 50.24/57.4
Ruc = 50.24/59.36 = 0.846 < 1 Ruh = 57.4/58.45 = 0.982 < 1
For both cooling and heating in all rooms, actual capacity is now greater than or equal to the maximum load. Selection is
completed.
(2) Calculate the final selection results according to the capacity calculation procedure.
[From calculation of the correction coefficient to calculation of actual capacity] (Cooling/heating)
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Rated capacity (kW) 73.0 / 81.5 16.0 / 18.0 14.0 / 16.0 14.0 / 16.0 7.30 / 8.00
Correction coefficient
(1) Model 1.00 / 1.00
(2) Temp. condition 1.019 / 0.941 0.934 / 0.964 0.934 / 0.964 0.934 / 0.964 0.934 / 0.964
(3) Tubing length,
elevation difference
0.798 / 0.856 1.105 / 1.070 1.079 / 1.052 1.026 / 1.018 1.00 / 1.00
(4) Frosting/defrosting 0.89
Result of (2) × (3) 1.032 / 1.031 1.008 / 1.014 0.958 / 0.981 0.934 / 0.964
Correction coefficient
applied to indoor unit *1
1.03 / 1.03 1.01 / 1.01 0.96 / 0.98 0.93 / 0.96
(5) Corrected capacity (kW) *2 59.36 / 58.45 16.00 / 18.00 14.00 / 16.00 13.42 / 15.69 6.82 / 7.71
(6) Correction coefficient
for corrected capacity ratio
1.00 / 1.00
(7) Actual capacity (kW)
16.00 / 18.00 14.00 / 16.00 13.42 / 15.69 6.82 / 7.71
*1: This varies depending on the values of (2) and (2) × (Distribution ratio in (3)).
*2: Corrected outdoor unit capacity = Rated outdoor unit capacity × (1) × (2) × (3) × (4)
The actual capacity is calculated as shown below.
Cooling: Ruc = (16.0 + 14.0 + 13.42 + 6.82) / 59.36 = 0.846 < 1
Therefore,
Actual cooling capacity of each indoor unit = Corrected cooling capacity of each indoor unit
(In other words, the correction coefficient (6) for the corrected capacity ratio is 1.)
Heating: Ruh = (18.0 + 16.0 + 15.69 + 7.71) / 58.45 = 0.982 < 1
Therefore,
Actual heating capacity of each indoor unit = Corrected heating capacity of each indoor unit × (0.1 × Ruh + 0.9) / Ruh
(In other words, the correction coefficient (6) for the corrected capacity ratio is (0.1 × Ruh + 0.9) / Ruh.)
2. System Design
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