Selection Procedure; Selection Procedure For Vrv Indoor Units Only - Daikin VRV IV S Series Engineering Data

Selection Procedure

5. Selection Procedure
5.1

Selection Procedure for VRV Indoor Units Only

5.1.1 Flowchart
[1] ] Given conditions
[2] ] Selection of indoor units
Indoor unit capacity corrected for indoor air temperature (WB) ≥ Required heat load × Safety factor for the indoor units
[3] ] Selection of outdoor unit
5.1.2 Selection Example
The following is a selection example based on total heat load for cooling.
Room H
Room A
Room B
Room C
Floor plan
[1] Given conditions
-Design conditions
Indoor air temperature: 18°CWB / 25°CDB, Outdoor air temperature: 33°CDB
-Determine peak load of each room (and system peak load if necessary)
-Required heat load of each room
Time Room A
9:00 1.4
12:00 2.0
14:00 2.7
16:00 3.2
From the above heat load calculation, the maximum heat load for the system (system peak load) is 15.2 kW.
14
Given Conditions:
· Design temperature and humidity (indoor & outdoor)
· Required heat load of each room
· System peak load ( if necessary)
· Piping length, level difference
· Specifications of indoor units (type and number)
Define safety factor for the indoor units and outdoor unit
Define required total heat load to outdoor unit
1) Use the sum of the peak load of each room
Provisionally select outdoor unit type and size based on limitation of combination ratio
Confirm that the number of indoor units connected to the outdoor unit is within limitation.
Correct for cooling & heating capacity of the outdoor unit by the following items
-Outdoor air temperature
-Indoor air temperature
-Combination ratio
Corrected capacity of the outdoor unit ≥ Required total heat load to the outdoor unit
VRV system selection is complete.
Room G
Room F
Room E
Room D
Room B Room C
1.4 0.9
2.1 1.5
2.8 1.5
3.2 1.2
2) Use the system peak load
-Piping length, level difference
-Piping heat loss
-Safety factor for the outdoor unit
-Defrost (only for heating capacity)
Yes
Room D Room E Room F
0.9 2.7 2.7
1.5 2.2 2.0
1.5 2.2 2.0
1.2 1.9 1.9
EDMT331529A
No
Room G Room H Total
0.9 0.9 11.9
1.2 1.2 13.8
1.3 1.3 15.2
1.1 1.1 14.8
Total heat load (kW)
General Information