Mitsubishi Electric CITY MULTI PUHY-M200-300YNW-A1 Data Book page 24

8. CAPACITY TABLES
<Cooling>
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
<Other>
Indoor/Outdoor Equivalent Piping Length
1. Cooling Calculation
(1) Temporary Selection of Indoor Units
Room1
PLFY-M100
Room2
PEFY-M100
(2) Total Indoor Units Capacity
M100 + M100 = M200
(3) Selection of Outdoor Unit
The M200 outdoor unit is selected as total indoor units capacity is M200
PUHY-EM200
(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)
= 11.2 × 1.03 + 11.2 × 0.98
= 22.5 kW
(5) Outdoor Unit Correction Calculation
Outdoor Design Dry Bulb Temperature Correction (37ºC)
Piping Length Correction (50 m)
Total Outdoor Unit Capacity (CTo)
CTo = Outdoor Rating × Outdoor Design Temperature Correction × Piping Length Correction
= 22.4 × 0.99 × 0.95
= 21.0 kW
(6) Determination of Maximum System Capacity (CTx)
Comparison of Capacity between Total Indoor Units Capacity (CTi) and Total Outdoor Unit Capacity (CTo)
CTi = 22.5 > CTo = 21.0, thus, select CTo.
CTx = CTo = 21.0 kW
(7) Comparison with Essential Load
Against the essential load 19.0kW, the maximum system capacity is 21.0kW: 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)
= 21.0 × (11.2 × 1.03)/(11.2 × 1.03 + 11.2 × 0.98)
= 10.8 kW
Room2
Maximum Capacity × Room2 Capacity after the Temperature Correction/(Room1,2Total Capacity after the Temperature Correction)
= 21.0 × (11.2 × 0.98)/(11.2 × 1.03 + 11.2 × 0.98)
= 10.2 kW
Go on to the heating trial calculation since the selected units fulfill the cooling loads of Room 1, 2.
MEES19K116
Design Condition
OK: fulfills the load 9.0kW
OK: fulfills the load 10.0kW
37 ºC
19.0 kW
27 ºC
20 ºC
9.0 kW
24 ºC
18 ºC
10.0 kW
50 m
1.03
0.98
11.2 kW (Rated)
11.2 kW (Rated)
Fig.1 Indoor unit temperature correction
To be used to correct indoor unit only
0.99
22.4 kW
1.03 (Refer to Fig.1)
Fig.2 Outdoor unit temperature correction
0.98 (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
Y-Series
18 20
Indoor Temperature [°CW.B.]
37
Outdoor Temperature [ °CD.B.]
Total capacity of indoor unit
V=Capacity of outdoor unit
V× 0.5
V× 0.75
V× 1.0
V× 1.3
50
Piping equivalent length (m)
22