Daikin REYQ38M7W1B [4/32] Selection procedure vrvii system based on cooling load

• Systems • Selection procedure

3

• Selection procedure

1 Selection procedure VRVII system based on cooling load

1-3 Actual performance data

Use outdoor unit capacity tables

Determine the correct table according to the outdoor unit model and combination ratio.

Enter the table at given indoor and outdoor temperature and find the outdoor capacity and power input. The individual indoor unit capacity (power

input) can be calculated as follows:

TNX: Total capacity index

Then, correct the indoor unit capacity according to the piping length.

If the corrected capacity is smaller than the load, the size of indoor unit has to be increased. Repeat the same selection procedure.

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

• Assume that the indoor and outdoor unit combination is as follows.

Outdoor unit: RXYQ10M

Indoor unit: FXCQ25M7 x 3, FXCQ40M7 x 5

• Indoor unit combination total capacity index

25 x 3 + 40 x 5 = 275 (110 %)

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