Page 20 - Advanced Gas Turbine Cycles

NOTATION

Note: Lower case symbols for properties represent specific quantities (Le. per unit mass)
Symbol Meaning Typical Units
A area
b, B steady flow availability
B Biot number
C capital cost
specific heat capacity, at constant pressure
CP
rcv10 calorific value at temperature To
dh hydraulic diameter
e, E exw
I8 work potential of heat transferred thennal exery
EUF energy utilisation factor
f fuellair ratio; also friction factor
F fuel energy supplied
g. G Gibbs function
irH enthalpy
h heat transfer coefficient
H plant utilisation
1 interest or discount rate
I lost work due to irreversibility (total)
rcR lost work due to internal irreversibility
P lost work due to heat transfer to the atmosphere
L blade length
rn mass fraction (e.g. of main steam flow)
M Mass flow; also fuel cost per annum; also
molecular weight: also Mach number
RR' Ratio of air and gas specific heats, (cd(cm)
NDCW non-dimensional compressor work
NDTW non-dimensional hnbine work
NDNW non-dimensional net work
NDHT non-dimensional heat supplied
N plant life
OM annual operational maintenance costs
P pressure
P electricity cost per year
8. Q heat supplied or rejected
r pressure ratio
R gas constant
R universal gas constant
S fuel costs per unit mass; also steam to air ratio
s, s entropy
st Stanton number
t time; also thermal barrier thickness
T temperature
V velocity
w, w specific work output, work output

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