Trane 4TVH0086FE000AA Service Manual page 13

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
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 50.7kW.
Table 1-5.1: Required heat load of each room (kW)
Time
9:00
12:00
14:00
16:00
 The maximum piping lengths and level differences in this example are as given in Figure 1-5.2.
Figure 1-5.2: System diagram
Outdoor
Unit
Level
difference
40m
 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.
Room H
Room C
Room A Room B Room C
4.8 4.8 3.0
6.6 7.1 5.1
9.0 9.4 4.9
10.6 10.7 3.9
Indoor Indoor
Unit Unit
Room G
Room D
Room D Room E
3.0 9.1
5.1 7.4
4.9 7.3
3.9 6.3
Equivalent length of piping 60m
Indoor Indoor
Unit Unit
12
Room F
Room E
Room F Room G Room H
9.0 2.9 2.9
6.8 4.0 4.0
6.8 4.2 4.2
6.2 3.8 3.8
Indoor Indoor
Unit Unit
Total
39.5
46.1
50.7
49.2
Indoor Indoor
Unit Unit