Page 21 - Advanced Gas Turbine Cycles

xviii Notation

(continued)
Symbol Meaning Typical Units
w+, w+ temperature difference ratios in heat transfer
X isentropic temphut ratio
Y velocity ratio
z polytropic expansion index
A, B, C, D. E, constants defined in text
F, KK'
a proportions of capital cost
a = %lh@
B = I+ % (8 - 1); also capital cost factor
Y = C*/C"
6 loss parameter
E heat exchanger effectiveness; also quantity
defined in eqn. [4.24]
b cost of fuel per unit of energy
t efficiency - see note below
8 ratio of maximum to minimum temperahut
A area ratio in heat transfer; also CO,
performance parameter
CL scaling factor on steam entropy, ratio of mass flows in
combined cycle (lower to upper)
Y nondimensional heat supplied (v,) or heat unused (w)
14Efl.T parameters in cycle analysis
P density
* T~JT-; also corporate tax rate
7
cooling air mass flow fraction
4 temperature function, J: 9,
also turbine stage loading coefficient
U expansion index defined in text i-1
K constant in expression for stagnation pressure loss (-f
subsrripts
4 a', b, b', c, states in steam cycle
d, e, e', f, f'
a air
A relating to heat rejection; artificial efficiency
bl blade (temperature)
B boiler; relating to heat supply
C cooling air
cot combustion (temperature)
C compressor (isentropic efficiency)
CAR Carnot cycle
cc combustion chamber (efficiency or loss)
CP combined plant (general)
CG cogeneration plant
cs control surface
cv control volume
d debt
dP dewpoint