Feed heater, Using Thermo Utilities, MS Excel Add-ins

 

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


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