Daikin FXL63LVE [29/56] Selection procedure

Daikin FXL63LVE [29/56] Selection procedure
• Introduction
6
Systems • Introduction
28
6 Selection procedure
6-1 Selection procedure standard System based on cooling load
6-1-4 Selection example based on cooling load
1 Given
Design condition
Cooling : indoor 20°CWB, outdoor 33°CDB
Cooling load
Power supply : 3-phase 380V/50Hz
2 Indoor unit selection
Enter indoor unit capacity table at:
20°CWB indoor temperature
33°CDB outdoor air temperature.
Selection results are as follows:
3 Outdoor unit selection
•Assume that the indoor and outdoor unit combination is as follows.
Outdoor unit : RSEYP10K
Indoor unit : FXYCP25K7 x 3 , FXYCP40K7 x 5
•Indoor unit combination total capacity index
25 x 3 + 40 x 5 = 275 (110 %)
4 Actual performance data (50Hz)
Outdoor unit cooling capacity : 31.7kW (RSEYP10K, 110 %)
•Individual capacity
Capacity of FXYCP25K = 31.7 x
25
= 2.88kW
275
Capacity of FXYCP40K7 = 31.7 x
40
= 4.61 kW
275
Actual combination capacity
The unit size for room A has to be increased from 25 to 32 because the capacity is less than the load. For new combination, actual capacity is calculated
as follows.
•Indoor unit combination total capacity index
25 x 2 +31.25 + 40 x5 = 281.25 (112.5 %)
Outdoor unit cooling capacity:
27,610 kcal/h (direct interpolation between 110 % and 120 % in the table)
•Individual capacity
Capacity of FXYCP25K = 31.9 x
25
= 2.84kW
281.25
Capacity of FXYCP32K = 31.9 x
32
= 3.63kW
281.25
Capacity of FXYCP40K = 31.9 x
40
= 4.54kW
281.25
Actual capacity of new combination
Then, the capacities have to be corrected for actual piping length according to the location of indoor and outdoor units and the distance between them.
Room A B C D E F G H
Load (kW) 2.9 2.7 2.5 4.3 4.0 4.0 3.9 4.2
Room A B C D E F G H
Load (kW) 2.9 2.7 2.5 4.3 4.0 4.0 3.9 4.2
Unit size 25 25 25 40 40 40 40 40
Capacity 3.0 3.0 3.0 4.8 4.8 4.8 4.8 4.8
Room A B C D E F G H
Load (kW) 2.9 2.7 2.5 4.3 4.0 4.0 3.9 4.2
Unit size 25 25 25 40 40 40 40 40
Capacity 2.88 2.88 2.88 4.61 4.61 4.61 4.61 4.61
Room A B C D E F G H
Load (kW) 2.9 2.7 2.5 4.3 4.0 4.0 3.9 4.2
Unit size 32 25 25 40 40 40 40 40
Capacity 3.63 2.84 2.84 4.54 4.54 4.54 4.54 4.54

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