Unit Selection (Based On Cooling Load); Given Condition; Cooling Load; Indoor Unit Selection - Midea VRF V4 Plus I Series Manual

MCAC-VTSM-2014-04

2. Unit selection (based on cooling load)

2.1 Given condition

Condition:
Cooling: indoor temperature 20

Cooling load

Location Room A
Load (kW) 5.9
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
Load (kW)
Unit size
Capacity (kW)
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:
5.6×3+7.1×2+8.0×2+4.5×1=51.5kW
 Select outdoor unit: MDV-560W/DRN1-i(C) which has nominal cooling capacity: 56kW.
Calculate the proportion between ① and ②: 51.5/56=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 (MDV-560W/DRN1-i(C)).
53.6KW←90% (Indoor temperature: WB 20°C, Outdoor temperature: DB 35°C)
56.6KW←100% (Indoor temperature: WB 20°C, Outdoor temperature: DB 35°C)
Then calculated the outdoor capacity in 92% combination index:
Therefore: 53.6+{(56.6-53.6)/ 10}×2= 54.2;
 Outdoor unit (MDV-560W/DRN1-i(C)) 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: MDV-D56T2 (54.2×56/522×0.958=5.57kW)
Room B: MDV-D56T2 (54.2×56/522×0.958=5.57kW)
Room C: MDV-D71T2 (54.2×71/522×0.958=7.06kW)
Room D: MDV-D71T2 (54.2×71/522×0.958=7.06kW)
Room E: MDV-D80T2 (54.2×80/522×0.958=7.96kW)
Room F: MDV-D56T2 (54.2×56/522×0.958=5.57kW)
Room G: MDV-D45T2 (54.2×45/522×0.958=4.48kW)
Room H: MDV-D80T2 (54.2×80/522×0.958=7.96kW)
Location Room A
Load (kW) 5.9
Unit size 56
Capacity (kW) 5.57
Selection Procedure
o
CWB, outdoor temperature 35
Room B Room C
5.8
Room B Room C
5.9 5.8
56 56
5.9 5.9
Room B Room C
5.8
56
5.57 7.06
R410A DC Inverter VRF V4 Plus Individual Series 50Hz
o
CDB;
Room D
7.5 7.3
Room D
7.5 7.3
71 71
7.5 7.5
Room D
7.5 7.3
71 71
7.06
Room E Room F
7.9 5.5
Room E Room F
7.9 5.5
80 56
8.4 5.9
Room E Room F
7.9 5.5
80 56
7.96 5.57
Room G Room H
4.5 7.8
Room G Room H
4.5 7.8
45 80
4.8 8.4
Room G Room H
4.5 7.8
45 80
4.48 7.96
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