Page 283 - Chemical process engineering design and economics
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262 Chapter 5
P power or pressure
PC compressor power
PCP compressor power for a polytropic compression
PE electric motor power
PF fan power
PP pump power
PT turbine power
R gas constant
s entropy
T absolute temperature
v average velocity or specific volume
V gas volumetric flow rate
W work
WA actual work of compressing a gas
W c compressor work
WCN compressor work for N cooling stages
fan work
W F
Wp polytropic or pump work
WPN polytropic work for N cooling stages
Ws isentropic work
W N turbine work
x mass fraction of moisture in steam
y mole fraction
z elevation
Greek
a kinetic energy correction factor
r] A isentropic efficiency
bearing efficiency or uncorrected steam-turbine efficiency
r| B
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