A boiler brings in feedwater at 95 0 F. In theeconomizer, the water is heated to

Question

A boiler brings in feedwater at 950F. In theeconomizer, the water is heated to 3500F. Thiswater is then passed to the boiler section and emerges as saturatedsteam at 150 psia. A superheater then heats the steam to6000F. This steam then expands in an isentropicsteam turbine, and work output passes to a 90% efficientgenerator. What is the overall efficiency of thecycle. The condenser operates at to 1 psia.

Record the enthlpies

h into economiizer = ____________Btu/lb

h into boiler section = ____________Btu/lb

h out of boiler section = ___________Btu/lb

h out of superheater = ____________Btu/lb  Total heat into steam =_________Btu/lbsteam

h out of turbine = ______________Btu/lb

w produced by turbine=___________Btu/lbsteam

w produced by generator=__________Btu/lbsteam

Cycle Efficiency = _____26__%

Explanation / Answer

cycle efficiency=work output/heat supplied                   whereheat supplied=hinlet to turbine-hf at 95F                                                 =1325.69-63.05                                                 =1262.64Btu/lbm cycle efficiency =409.224/1262.64                        =32.41% I hope this is clear to you                                                 =1325.69-63.05                                                 =1262.64Btu/lbm cycle efficiency =409.224/1262.64                        =32.41% I hope this is clear to you

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