Selection Procedure For Mixed Selection Of Vrv And Residential Indoor Units - Daikin VRV IV S Series Engineering Data

Selection Procedure
5.2

Selection Procedure for Mixed Selection of VRV and Residential Indoor Units

5.2.1 Flowchart
For the selection of residential indoor units, the following procedures shall be added to the standard selection of VRV
indoor units.
-Correct the capacity of VRV indoor units for "Evaporating temperature (Te: 9ºC)". (only for cooling capacity)
-Correct the capacity of Residential indoor units for "Indoor air temperature".
-Use Correction factor to calculate the capacity of outdoor units. (only for cooling capacity)
5.2.2 Selection Example
The following is a selection example based on total heat load for cooling.
[1] Given conditions
-Design conditions
Indoor air temperature: 18°CWB / 25°CDB, Outdoor air temperature: 33°CDB
-Determine the peak load of each room (and the system peak load if necessary)
Table of the required heat load of each room
Room A
2.4
Level difference
10m
-Safety factor
In this example, safety factor is not used. (i. e., safety factor = 1.0)
[2] Selection of indoor units
 For VRV indoor unit selection (Room A, B, C)
In case of mixed selection of VRV indoor units and Residential indoor units,
correct the capacity of VRV indoor units for "Indoor air temperature" and "Evaporating temperature (Te: 9ºC)".
In case design temperature of the indoor air falls between temperatures listed in the table, calculate the capacity by
interpolation.
-Capacity table of VRV indoor units
Cooling Capacity
Capacity
Model
indication
FXDQ20PBVE
20
FXDQ20PBVET
FXDQ25PBVE
25
FXDQ25PBVET
FXDQ32PBVE
32
FXDQ32PBVET
FXDQ40NBVE
40
FXDQ40NBVET
FXDQ50NBVE
50
FXDQ50NBVET
FXDQ63NBVE
63
FXDQ63NBVET
TC: Total capacity
SHC: Sensible heat capacity: kW
18
Room B Room C
2.4 1.5
Equivalent pipe length 30m
Room A Room B
VRV indoor units (ducted) for Room A, B, C, and Residential indoor units (ducted) for Room D, E, F.
14.0˚CWB 16.0˚CWB
20˚CDB 23˚CDB
TC SHC TC SHC
1.5 1.4 1.8 1.6
1.9 1.6 2.3 1.9
2.4 1.9 2.9 2.2
3.0 2.5 3.6 2.8
3.8 3.1 4.5 3.5
4.8 3.8 5.7 4.3
Room D Room E
3.6
Room C
Room D
Indoor air temp.
18.0˚CWB 19.0˚CWB
26˚CDB 27˚CDB
TC SHC TC SHC
2.1 1.8 2.2 1.9
2.6 2.1 2.8 2.1
3.4 2.4 3.6 2.6
4.2 3.2 4.5 3.3
5.2 3.9 5.6 4.0
6.6 4.8 7.1 4.9
EDMT331529A
Room F
3.6 1.5
Total heat load (kW)
Room F
Room E
20.0˚CWB 22.0˚CWB
28˚CDB 30˚CDB
TC SHC TC SHC
2.2 1.8 2.3 1.6
2.8 2.1 2.9 2.0
3.6 2.4 3.7 2.4
4.6 3.1 4.7 3.0
5.7 3.9 5.8 3.8
7.2 4.6 7.4 4.6
General Information
Total
15.0
24.0˚CWB
32˚CDB
TC SHC
2.3 1.7
3.0 1.9
3.8 2.4
4.8 3.1
5.9 3.5
7.5 4.6