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HEAT of Compression
Moisture
7 Cubic Units of Air at Atmospheric Pressure
1 Cubic Unit at Approximately 7 times Atmospheric Pressure
Air Compressor+
ENERGY
HEAT of Compression
Moisture
7 Cubic Units of Air at Atmospheric Pressure
1 Cubic Unit at Approximately 7 times Atmospheric Pressure
Air Compressor+
ENERGY
Electricity 76%
Maintenance 12%
Equipment & Installation
12%
Heat of Compression and Compressor Losses (~80 HP)
Filters and Leaks (~6 HP)
Pneumatic to Mechanical Conversion (~2 HP)
Useful Energy Output (9 HP)
Desiccant Dryer (~3 HP)
100 HP Energy Input
“Wet
” R
ecei
ver
Air
Com
pres
sor 2
(Var
iabl
e S
peed
)
Air
Com
pres
sor 1
Air
Dry
er“D
ry”
Rec
eive
r
Filte
r
Pre
ssur
e C
ontro
ller
(Opt
iona
l)A
ir D
istri
butio
n P
ipes
to
Pla
nt
Afte
rcoo
ler
Afte
rcoo
ler
Zero
Air
Dra
inZe
ro A
ir D
rain
Zero
Air
Dra
in
Zero
Air
Dra
in
End
Use
E
qupi
mnt
End
Use
E
qupi
mnt
Air
Inta
ke
Air
Inta
ke
Rotor Timing Gears Seals
Water Jacket
Oil-Free Rotor Set Bearings
0
20
40
60
80
100
120
0 20 40 60 80 100
Percent Capacity
Perc
en
t kW
In
pu
t P
ow
er
Load/Unload (10 gal/cfm) Load/Unload (1 gal/cfm)
0
20
40
60
80
100
120
0 20 40 60 80 100
Percent Capacity
Perc
en
t kW
In
pu
t P
ow
er
Inlet Valve Modulation (No Blow down)Inlet Valve Modulation (With Blow down)
0
20
40
60
80
100
120
0 20 40 60 80 100
Percent Capacity
Perc
en
t kW
In
pu
t P
ow
er
0
20
40
60
80
100
120
0 20 40 60 80 100
Percent Capacity
Perc
en
t kW
In
pu
t P
ow
er
Variable Speed (w ith Unloading) Variable Speed (w ith Stopping)
110
105
100
95
90
85
80
115 Compressor#1
Compressor#2
Compressor#3
Compressor#4
Production Minimum Requirement
Syst
em P
ress
ure
(psi
g) 110
105
100
95
90
85
80
115 Compressor#1
Compressor#2
Compressor#3
Compressor#4
Production Minimum Requirement
Syst
em P
ress
ure
(psi
g)
ºF]
0
20
40
60
80
100
120
0 20 40 60 80 100 120 140
Time (40 Second Intervals)
Air
Pre
ss
ure
(p
sig
) /
Mo
tor
Am
ps
(a
mp
s)
Pressure (psig) Motor Amps
o
o
