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(Solution Download) 8.56 Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater....

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8.56   Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.2 and 10008F and expands to 120 lbf/ in.2, where some of the steam is extracted and diverted to the closed feedwater heater. The remaining steam expands

through the second-stage turbine to the condenser pressure of 2 lbf/in.2 Each turbine stage and the pump have isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, and steam generator is at constant pressure. Condensate exiting the feedwater heater as saturated liquid at 120 lbf/in.2 undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 1400  lbf/in.2    and  a  temperature  equal  to  the  saturation


 


temperature at 120 lbf/in.2 The net power output of the cycle is 1 3 109 Btu/h. Determine for the cycle

(a)   the mass flow rate of steam entering the first stage of the turbine, in lb/h.

(b)   the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator.

(c)   the thermal efficiency.

 

 







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