Closed-feed heaters, Using Thermo Utilities, MS Excel Add-ins

A regenerative steam cycle uses two closed-feed heaters. Determine the amount of steam bled at each stage. It is known that:

pB=10 bar, hB=3033 kJ/kg, pC=1.0 bar, hC=2590 kJ/kg, pG=40 bar, hG=112 kJ/kg. Boiler supplies 10 kg/s steam to the turbine.


Inputs

Units

Spec. enthalpy at B

3033,00

kJ/kg

Spec. enthalpy at C

2590,00

kJ/kg

Spec. enthalpy at G

112,00

kJ/kg

Pressure at B

10,00

bar

Pressure at C

1,00

bar

Pressure at G

40,00

bar

Mass flow through the system

10,00

kg/s

Outputs

For the throttling process, I-J

.

.

hE = hI = hJ

762,61

kJ/kg

For the throttling process, K-L

.

.

hF = hK = hL

417,51

kJ/kg

Energy balance on FH1 gives, mB

1,52

kg/s

Energy balance on FH2 gives, mC

1,16

kg/s


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