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5. Capacity correction
Hydro Unit HT
Example) Combination: 8TON DVM S + 4TON HT X 2ea, Outdoor 41˚F DB, EW/LW=131˚F/149˚F
1) Defrosting correction factor (Outdoor unit, 41˚F) = 0.91
2) Capacity correction factor (Hydro unit HT) = 0.3
3) Integrated capacity correction factor = 0.91 - (1 - 0.91) x 0.3 = 0.883
4) HC = 0.883 x 54,500Btu/h x 2ea = 109,000Btu/h
5) Power input (Outdoor unit) = 6.88kW
6) Power input (Hydro unit HT) = { 0.91 x ( 2,453W + 2,419W ) / 2 + ( 1 - 0.91 ) x 1,050W } x 2 = 4.62kW
7) Total PI = 6.88 + 4.62 = 11.5kW
8TON DVM S TDB Heat Capacity Table
Combination,%
(Capacity index)
100%
Correction Factor : Ref.P16, Hydro Unit Capacity Table : Ref.P.12
Outdoor Temperature(℉)
DB
WB
68
-6
1
0
5
3
10
9
14
12
19
18
23
21
27
25
32
30
37
36
41
39
45
43
48
46
52
50
55
54
59
57
Indoor Temperature(℉,DB)
68℉
TC
PI
Btu/h
kW
90,422
10.24
95,881
10.45
99,293
10.67
101,341
10.62
104,753
10.4
106,459
9.57
107,482
8.99
107,482
8.15
107,482
7.68
107,482
7.25
107,482
6.88
107,482
6.70
107,482
6.38
107,482
6.08
107,482
5.81
107,482
5.61
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