MEES19K180
PURY-HP-T(S)NU-A, Y(S)NU-A
36
8. CAPACITY TABLES
Hyper Heating Inverter R2-Series
0.99
99
Ratio of cooling capacity
Outdoor Temperature [°FD.B.]
64
68
Indoor Temperature [°FW.B.]
Ratio of cooling capacity
0.96
1.02
<Cooling>
Design Condition
Outdoor Design Dry Bulb Temperature
99 ºF
Total Cooling Load
63,000 BTU/h
Room1
Indoor Design Dry Bulb Temperature
81 ºF
Indoor Design Wet Bulb Temperature
68 ºF
Cooling Load
31,000 BTU/h
Room2
Indoor Design Dry Bulb Temperature
75 ºF
Indoor Design Wet Bulb Temperature
64 ºF
Cooling Load
32,000 BTU/h
<Other>
Indoor/Outdoor Equivalent Piping Length
100 ft.
1. Cooling Calculation
(1) Temporary Selection of Indoor Units
Room1
PEFY-P36
36,000 BTU/h (Rated)
Room2
PEFY-P36
36,000 BTU/h (Rated)
(2) Total Indoor Units Capacity
P36 + P36 = P72
(3) Selection of Outdoor Unit
The P72 outdoor unit is selected as total indoor units capacity is P72
PUHY-P72
72,000 BTU/h
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Wet Bulb Temperature Correction (68ºF)
1.02 (Refer to Fig.1)
Fig.1
Indoor unit temperature correction
To be used to correct indoor unit only
Fig.2
Outdoor unit temperature correction
To be used to correct outdoor unit only
Fig.3
Correction of refrigerant piping length
Room2
Indoor Design Wet Bulb Temperature Correction (64ºF)
0.96 (Refer to Fig.1)
CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 36,000 × 1.02 + 36,000 × 0.96
= 71,200 BTU/h
(5) Outdoor Unit Correction Calculation
Outdoor Design Dry Bulb Temperature Correction (99ºF)
0.99 (Refer to Fig.2)
Piping Length Correction (100 ft.)
0.95 (Refer to Fig.3)
Total Outdoor Unit Capacity (CTo)
Total Indoor Units Capacity (CTi)
CTo = Outdoor Rating × Outdoor Design Temperature Correction × Piping Length Correction
= 72,000 × 0.99 × 0.95
= 67,700 BTU/h
(6) Determination of Maximum System Capacity (CTx)
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 71,200 > CTo = 67,700, thus, select CTo.
CTx = CTo = 67,700 BTU/h
(7) Comparison with Essential Load
Against the essential load 63,000BTU/h, the maximum system capacity is 67,700BTU/h: Proper outdoor units have been selected.
(8) Calculation of Maximum Indoor Unit Capacity of Each Room
CTx = CTo, thus, calculate by the calculation below
Room1
Maximum Capacity × Room1 Capacity after the Temperature Correction/(Room1,2 Total Capacity after the Temperature Correction
= 67,700 × (36,000 × 1.02)/(36,000 × 1.02 + 36,000 × 0.96)
= 34,800 BTU/h
OK: fulfills the load 31,000BTU/h
Room2
Maximum Capacity × Room2 Capacity after the Temperature Correction/(Room1,2Total Capacity after the Temperature Correction)
= 67,700 × (36,000 × 0.96)/(36,000 × 1.02 + 36,000 × 0.96)
= 32,800 BTU/h
OK: fulfills the load 32,000BTU/h
Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.
0.95
Total capacity of indoor unit
V=Outdoor unit capacity
Piping equivalent length (ft.)
Cooling capacity correction factor
100
V× 0.5
V× 1.0
V× 1.3
V× 0.75
0000005744.BOOK 36 ページ 2020年2月25日 火曜日 午後5時19分