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Mitsubishi Electric CITY MULTI PURY-HP72TNU-A Data Book page 34

Air conditioning systems
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8. CAPACITY TABLES
Outdoor Design Dry Bulb Temperature
Total Cooling Load
Room1
Indoor Design Dry Bulb Temperature
Indoor Design Wet Bulb Temperature
Cooling Load
Room2
Indoor Design Dry Bulb Temperature
Indoor Design Wet Bulb Temperature
Cooling Load
Indoor/Outdoor Equivalent Piping Length
1. Cooling Calculation
(1) Temporary Selection of Indoor Units
Room1
PEFY-P36
Room2
PEFY-P36
(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
(4) Total Indoor Units Capacity Correction Calculation
Room1
Indoor Design Wet Bulb Temperature Correction (20ºC)
Room2
Indoor Design Wet Bulb Temperature Correction (18ºC)
Total Indoor Units Capacity (CTi)
CTi = Σ (Indoor Unit Rating × Indoor Design Temperature Correction)
= 10.6 × 1.02 + 10.6 × 0.96
= 20.9 kW
(5) Outdoor Unit Correction Calculation
Outdoor Design Dry Bulb Temperature Correction (37ºC)
Piping Length Correction (30 m)
Total Outdoor Unit Capacity (CTo)
CTo = Outdoor Rating × Outdoor Design Temperature Correction × Piping Length Correction
= 21.1 × 0.99 × 0.95
= 19.8 kW
(6) Determination of Maximum System Capacity (CTx)
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 20.9 > CTo = 19.8, thus, select CTo.
CTx = CTo = 19.8 kW
(7) Comparison with Essential Load
Against the essential load 18.5kW, the maximum system capacity is 19.8kW: 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
= 19.8 × (10.6 × 1.02)/(10.6 × 1.02 + 10.6 × 0.96)
= 10.2 kW
Room2
Maximum Capacity × Room2 Capacity after the Temperature Correction/(Room1,2Total Capacity after the Temperature Correction)
= 19.8 × (10.6 × 0.96)/(10.6 × 1.02 + 10.6 × 0.96)
= 9.6 kW
Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.
MEES19K180
Design Condition
OK: fulfills the load 9.0kW
OK: fulfills the load 9.5kW
37 ºC
18.5 kW
27 ºC
20 ºC
9.0 kW
24 ºC
17.8 ºC
9.5 kW
30 m
1.02
0.96
10.6 kW (Rated)
10.6 kW (Rated)
Fig.1 Indoor unit temperature correction
To be used to correct indoor unit only
21.1 kW
0.99
1.02 (Refer to Fig.1)
Fig.2 Outdoor unit temperature correction
0.96 (Refer to Fig.1)
To be used to correct outdoor unit only
0.95
0.99 (Refer to Fig.2)
0.95 (Refer to Fig.3)
Fig.3 Correction of refrigerant piping length
Hyper Heating Inverter R2-Series
18
20
Indoor Temperature [°CW.B.]
37
Outdoor Temperature [°CD.B.]
Total capacity of indoor unit
V=Outdoor unit capacity
V× 0.5
V× 0.75
V× 1.0
V× 1.3
30
Piping equivalent length (m)
32
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