In a Rankine cycle, wet steam (3.5 bar with q = 0.83) is bled off for heating purpose. The bleed steam and feed water (3.5 bar and 135 C) from a pump are mixed in the feed heater. Determine the quantity of bleed steam. The steam supplied from the boiler is 5 kg/s.
| Inputs |
Units |
|
|
Pressure at A, B and C |
3,5 |
bar |
|
Steam quality at A |
0,83 |
. |
|
Steam Temp. at B |
135 |
C |
|
Steam quality at C |
0 |
. |
|
Mass Flow |
5,00 |
kg/s |
|
Outputs |
||
|
Spec. enthalpy at A |
2366,57 |
kJ/kg |
|
Spec. enthalpy at B |
567,7223 |
kJ/kg |
|
Spec. enthalpy at C |
584,27 |
kJ/kg |
|
Energy and mass balance |
. |
. |
|
Eq1: mA + mB - mC = 0 |
. |
. |
|
Eq2: mA*hA + mB*hB - mC*hC = 0 |
. |
. |
|
mass flow of bleed steam |
0,046 |
kg/s |