Design of 3WAY VRF SYSTEM
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2
3
4
5
6
7
8
2. System Design
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
Load (cooling/heating) (BTU/h)
Rated capacity (cooling/heating) (BTU/h)
(5) Corrected capacity (cooling/heating) (BTU/h)
(7) Actual capacity (cooling/heating) (BTU/h)
(7) Actual capacity (BTU/h)
For both cooling and heating in all rooms, actual capacity is now greater than or equal to the maximum load. Selection is completed.
[From calculation of the correction coefficient to calculation of actual capacity]
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)
Correction coefficient
Model
Distribution ratio
(1)
(2) Temp. condition
(3) Tubing length, elevation difference
(4) Frosting/defrosting
Result of (2) × (3)
Correction coefficient applied to indoor unit *1
(5) Corrected capacity (BTU/h) *2
The actual capacity is calculated as shown below.
Cooling: Ruc = (54,600.00 + 35,781.01 + 34,941.99 + 23,684.99) / 168,609.06 = 0884 < 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 = (61,768.40 + 39,234.00 + 39,234.00 + 27,162.00) / 173,189.02 = 0.967 < 1
Therefore,
Actual heating capacity of each indoor unit = Corrected heating capacity of each indoor unit
(In other words, the correction coefficient (6) for the corrected capacity ratio is 1.)
96 + 96
Type 54
Type 36
Type 36
Type 24
192,000 /
216,000
50,000 /
55,000
54,600.00 /
61,400.00
168,609.06 /
173,189.02
54,600 /
61,400
54,600.00 /
61,768.40
30,000 /
35,000
35,781.01 /
39,000.00
36,000 /
39,000
35,781.01 /
39,234.00
30,000 /
35,000
34,941.99 /
39,000.00
36,000 /
39,000
34,941.99 /
39,234.00
18,500 /
20,000
23,684.99 /
27,000.00
25,000 /
27,000
192,000 /
216,000
1.0000 /
1.0000
54,600 /
61,400
36,000 /
39,000
36,000 /
39,000
25,000 /
27,000
1.0203 /
1.0000
0.9474 /
1.0060
0.9474 /
1.0060
0.9474 /
1.0060
0.9474 /
1.0060
0.8607 /
0.9009
0.9240 /
0.9461
0.9030 /
0.9311
0.8818 /
0.9159
0.8607 /
0.9009
168,609.06 /
173,189.02
54,600.00 /
61,768.40
35,781.01 /
39,234.00
34,941.99 /
39,234.00
23,684.99 /
27,162.00
54,600.00 /
61,400.00
35,781.01 /
39,000.00
34,941.99 /
39,000.00
23,684.99 /
27,000.00
1.0171 /
1.0565
1.0491 /
1.0335
1.0245 /
1.0167
1.0000 /
1.0000
1.0000 /
1.0000
0.9939 /
1.0000
0.9706 /
1.0000
0.9474 /
1.0000
1.0000 /
1.0000
1.0000 /
1.0000
1.0000 /
1.0000
1.0000 /
1.0000
23,684.99 /
27,162.00
0.8900
0.9939 /
1.0397
0.9706 /
1.0228
0.9474 /
1.0060
Ruh = 167,398.40/173,189.02 = 0.967 < 1
Ruc = 149,008.00/168,609.06 = 0.884 < 1
Total corrected capacity of indoor units (cooling/heating) = 149,008.00/167,398.40
Indoor unit changes
(2) Calculate the final selection results according to the capacity calculation procedure.
(Cooling/heating)
(6) Correction coefficient for corrected capacity ratio
*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)
TD831158-00̲3WAY̲VRF̲SYS.indb 19
TD831158-00̲3WAY̲VRF̲SYS.indb 19
2012/01/23 17:30:14
2012/01/23 17:30:14
Summary of Contents for U-72MF1U9
Page 118: ...Section 8 TENTATIVE ...