Page 80 - Handbook of Energy Engineering Calculations
P. 80
FIGURE 13 (a) Cycle diagram. (b) H-S chart for cycle in (a).
2. Compute the percent steam extracted for the feedwater heater
(a) The steam extracted for the feedwater heater, x, = (H − H )(H − H ) =
f
x
fx
f
(219 − 70)/(1245 − 70) = 0.1268, or 12.68 percent.
3. Find the turbine steam rate
(b) For the Rankine-cycle steam rate, w = 3413/(H − H ). For this cycle, w s
c
s
1
= 3413/[(H − H ) + x(H − H ) + (1 − x)(H − H )]. Or, w = 3413/[1372 −
s
3
2
1
c
3
x
