MIL-HDBK 1028/6A
Table 5
Example of Design Method, Environmental Control Air System
RECOMMENDED UNIT CAPACITY
Step
Description
1.
Number and type of aircraft:
36 F-14 aircraft
2.
Aircraft service requirements:
ECS air = 100 lb/min 45 psig
Electrical = 20.0 kVA, 400 Hz
3.
Aircraft to be served simultaneously:
36 aircraft
= 12 aircraft
3.0 diversity factor
4.
Number and location of services to be provided:
Preconditioned air = 4 in hangar
ECS air = 12 on flight line
Electrical = 8 on flight line
Electrical = 4 in hangar
5.
System capacity:
ECS air compressor capacity:
12 aircraft x 100 lb/min x 13.33 scf/lb = 16,000 scfm
Electrical:
12 aircraft x 20 kVA = 240 kVA total demand
6.
Equipment unit size:
ECS air: (compressor capacity)
16,000 scfm = 4000 scfm
4
7.
Select three compressors at 4000 scfm and two at
2000 scfm, all at 110 psig discharge pressure.
31
31
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