2-19
Design of W-3WAY ECO-i SYSTEM Unit Specifi cations
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 14053+09053
Type 4852
Type 4852
Type 3652
Type 2452
Maximum load
(cooling/heating) (BTU/h)
40,000 / 46,000
40,000 / 46,000
30,000 / 35,000
18,000 / 23,000
Rated capacity
(cooling/heating) (BTU/h)
249,100 / 278,100
47,800 / 54,600
47,800 / 54,600
36,000 / 39,000
25,000 / 27,000
(5) Corrected capacity
(cooling/heating) (BTU/h)
208,100 / 201,900
47,400 / 54,600
46,300 / 54,600
34,000 / 38,900
23,000 / 26,400
(7) Actual capacity
(cooling/heating) (BTU/h)
47,400 / 54,600
46,300 / 54,600
34,000 / 38,900
23,000 / 26,400
Total corrected capacity of all indoor units (cooling/heating) = 150,700/174,500
Ruc = 150,700/208,100 = 0.724 < 1 Ruh = 174,500/201,900 = 0.864 < 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 fi nal selection results according to the capacity calculation procedure.
[From calculation of the correction coeffi cient 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 (BTU/h)
249,100 / 278,100
47,800 / 54,600
47,800 / 54,600
36,000 / 39,000
25,000 / 27,000
Correction coefficient
(1) Model
1.00 / 1.00
(2) Temp. condition
1.020 / 0.937
0.921 / 0.780
0.921 / 0.980
0.921 / 0.980
0.921 / 0.980
(3) Tubing length,
elevation difference
0.819 / 0.871
1.077 / 1.052
1.052 / 1.035
1.026 / 1.017
1.00 / 1.00
(4) Frosting/defrosting
0.89
Result of (2) × (3)
0.992 / 1.031
0.969 / 1.014
0.945 / 0.997
0.921 / 0.980
Correction coefficient
applied to indoor unit *1
0.99 / 1.03
0.97 / 1.01
0.95 / 1.00
0.92 / 0.98
(5) Corrected capacity (BTU/h) *2
208,100 / 201,900
47,400 / 54,600
46,300 / 54,600
34,000 / 38,900
23,000 / 26,400
(6) Correction coefficient
for corrected capacity ratio
1.00 / 1.00
(7) Actual capacity (BTU/h)
47,400 / 54,600
46,300 / 54,600
34,000 / 38,900
23,000 / 26,400
*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 = (47,400 + 46,300 + 34,000 + 23,000) / 208,100 = 0.724 < 1
Therefore,
Actual cooling capacity of each indoor unit = Corrected cooling capacity of each indoor unit
(In other words, the correction coeffi cient (6) for the corrected capacity ratio is 1.)
Heating: Ruh = (54,600 + 54,600 + 38,900 + 26,400) / 201,900 = 0.864 < 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 coeffi cient (6) for the corrected capacity ratio is (0.1 × Ruh + 0.9) / Ruh.)
2. System Design
TD831139̲Sec2̲p18-23.indd 19
TD831139̲Sec2̲p18-23.indd 19
2008/04/17 15:32:15
2008/04/17 15:32:15
