A smaller power plant produces steam at 3MPa, 600°C in the boiler. It keeps the condenser at 45°C by transfer of 10MW out as heat transfer. The first turbine section expands to 500 kPa and then flow is reheated followed by the expansion in the low pressure turbine. Find the reheat temperature so the turbine output is saturated vapour. For this reheat find the total turbine power output and the boiler heat transfer. Properties of water are given in the table below:
|
t,
°C
|
P,
kPa
|
vl,
kg/m3
|
vg,
kg/m3
|
hl,
kJ/kg
|
hv,
kJ/kg
|
sl,
kJ/kg.K
|
sv,
kJ/kg.K
|
|
45
|
9.59
(psat)
|
0.00101
|
15.252
|
188.42
|
2583.19
|
0.63861
|
8.1647
|
|
233.85
|
3000
(Psat)
|
0.0012167
|
0.066664
|
1008.29
|
2803.99
|
2.6455
|
6.1870
|
|
600
|
3000
|
-
|
0.13245
|
-
|
3682.34
|
-
|
7.5084
|