Atom B Series VRF 50/60Hz
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Part 1 –
5.2 Example
The following is a selection example based on total heat load for cooling.
Figure 1-5.1: Room plan
Room A
Room B
Room C
Room D
Step 1: Establish design conditions
Indoor air temperature 25°C DB, 18°C WB; outdoor air temperature 33°C DB.
Determine peak load of each room and system peak load. As shown in Table 1-5.1, the system peak load is 10.5kW.
Table 1-5.1: Required heat load of each room (kW)
Time Room A Room B Room C Room D Total
9:00 2.5 1.6 1.6 1.6 7.3
12:00 3.2 2.4 2.4 2.4 10.4
14:00 3.1 2.4 2.4 2.6 10.5
16:00 3.1 2.3 2.3 2.3 10
The maximum piping lengths and level differences in this example are as given in Figure 1-5.2.
Figure 1-5.2: System diagram
Indoor unit type for all rooms: Medium Static Pressure Duct (T2).
Step 2: Select indoor units
In this example, a safety factor is not used (i.e. the safety factor is 1).
Select indoor unit models using the medium static pressure duct cooling capacity table. Each indoor unit's corrected
capacity needs to be greater than or equal to the peak load of the relevant room. The selected indoor units are shown
in Table 1-5.3.
Equivalent length of piping 20m
Outdoor
Unit
Indoor
Indoor
Indoor
Indoor
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