Thermodynamics -superheated steam

timer Asked: Aug 9th, 2014

Question Description

A)  superheated steam at a pressure of 40 bar @ a temp of 500 degrees supplied to a turbine of a rankine cycle. If the condenser pressure is 0.03 bar, what is the thermal efficiency of the cycle ? Please ignore pump energy.

B)  if isentropic efficiency of the steam turbine in Q1 above is 0.82, what is the Enthalpy of the steam discharged into the condenser & the thermal efficient of the cycle.

C)  A steam turbine operates with a condenser pressure of 0.04 bar and has a single open type regenerative feed heater. How much steam @ 2 bar and a dryness fraction of 0.98 must be bled from the turbine to produce 1 kg of a saturated feedwater @ 2 bar.

D)  steam at 30 bar and 500 degrees enters a pass out turbine at a rate of 18000 kg h-1. The  bulk of this steam is expanded isentropicaly to a condenser pressure of 0.03 bar, but 32 percent is bled from the turbine at a pressure of 3 bar for process heating. If the condensate from the process heater is directly pumped back to the boiler.

: the power output from the turbine

: the rate of process heating

: the efficiency of the plant

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