An ideal Rankine cycle power plant has superheated steam entering the turbine at

Question

An ideal Rankine cycle power plant has superheated steam entering the turbine at 8 MPa and 440 C. The first turbine stage expands the steam to 1.5 MPa, where a portion is bled to an open feedwater heater operating at that pressure. The remaining portion expands through the second turbine stage to the condenser pressure of 4 kPa. The turbine output is 10 MW. Each turbine stage and each pump operates isentropically. Refer to the following table:

Determine the following:

I) the fraction of steam extracted form the turbine

II) the heat added in the steam generator (kJ/kg)

III) the total turbine work (kJ/kg)

IV) the total pump work per unit mass passing through the first turbine stage (kJ/kg)

V) the steam mass flow rate pasing through the first turbine stage (kg/s)

VI) the thermal efficiecy

Explanation / Answer

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