DM14-01.01.18en
MIV V5 Heat Recovery DC Inverter R410A
Selection Procedure
22
2. Unit selection (based on cooling load)
2.1 Given condition
Condition:
Cooling: indoor temperature 20
o
CWB, outdoor temperature 35
o
CDB;
Cooling load
Location
Room A
Room B
Room C
Room D
Room E
Room F
Load kW(Btu/h)
2.1(7170)
2.8(9559)
3.5(11900) 4.6(15700) 5.8(19790) 7.2(24570)
Power supply: outdoor 380~415V-3Ph-50Hz, indoor 220~240V-1Ph-50Hz.
Piping length: 50m; Height difference between indoor unit and outdoor unit: 30m
2.2 Indoor unit selection
Select the suitable capacity for condition of ‘Indoor 20°C WB, Outdoor 35°C DB’ using indoor unit capacity
table. The selected result is as follows. (Assuming the indoor unit type is duct)
Location
Room A
Room B
Room C
Room D
Room E
Room F
Load kW(Btu/h)
2.1(7170)
2.8(9559)
3.5(11900) 4.6(15700) 5.8(19790) 7.2(24570)
Model
22
28 36 45 56 71
Capacity kW(Btu/h)
2.3(7850)
2.9(9900)
3.7(12600) 4.8(16400) 6.0(20500) 7.5(25600)
2.3 Outdoor unit selection
1) Assume the indoor unit and outdoor unit combination as follows
Calculate the total nominal capacity of indoor units in the combination according to the above table:
2.2 × 1 +2.8 × 1+ 3.6 × 1 +4.5 × 1+ 5.6 × 1 + 7.1 × 1 = 25.8kW(88000Btu/h)
Select outdoor unit: MVUR280B-VA3 which has nominal cooling capacity: 28kW (95500Btu/h).
Calculate the proportion: 258/280= 92%
2) Result: Because the proportion is within 50
～
130%, it is a right selection.
Real function data with indoor unit combination
For the 92% combination, calculate the cooling capacity of outdoor unit (MVUR280B-VA3).
26.8kW(91440Btu/h)
←
90% (Indoor temperature: WB 20°C, Outdoor temperature: DB 35°C)
28.3kW(96560Btu/h)
←
100% (Indoor temperature: WB 20°C, Outdoor temperature: DB 35°C)
Then calculate the outdoor capacity in 92% combination index:
Therefore: 26.8+{(28.3-26.8)/ 10}×2=27.1kW(92470Btu/h);
Outdoor unit (MVUR280B-VA3) cooling temperature: DB 35°C
Capacity modification coefficient with pipe length 50m and height difference 30m: 0.958
Each indoor unit cooling capacity
Room A:
MVM22A-VA1 (27.1×22/258×0.958=2.21kW) (92470×7510/88000×0.958=7540Btu/h)
Room B:
MVM28A-VA1 (27.1×28/258×0.958=2.82kW) (92470×9550/88000×0.958=9620Btu/h)
Room C:
MVM36A-VA1 (27.1×36/258×0.958=3.62kW) (92470×12300/88000×0.958=12350Btu/h)
Room D:
MVM45A-VA1 (27.1×45/258×0.958=4.53kW) (92470×15400/88000×0.958 =15460Btu/h)
Room E:
MVM56A-VA1 (27.1×56/258×0.958=5.64kW) (92470×19110/88000×0.958=19250Btu/h)
Room F:
MVM71A-VA1 (27.1×71/258×0.958=7.14kW) (92470×24200/88000×0.958=24360Btu/h)
Location
Room A
Room B
Room C
Room D
Room E
Room F
Load kW(Btu/h)
2.1(7170)
2.8(9559)
3.5(11900) 4.6(15700) 5.8(19790) 7.2(24570)
Model 22 28 36 45 56 71
Capacity kW(Btu/h)
2.21(7540)
2.82(9620)
3.62(12350) 4.53(15460) 5.64(19250) 7.14(24360)
