A Rankine cycle with inlet steam at 90 bar and 500oC and condensation at 40oC produces 500MW. It has one stage of reheat, optimally placed, back to 500oC. One feedwater of the closed type with drains cascade back to the condenser receives bleed steam at the reheat pressure. The high and low pressure turbine sections have polytropic efficiencies of 82 and 90 percent, respectively. The pump has polytropic efficiency of 0.75. Calculate: a) The mass flow rate of steam at the turbine inlet in kilograms per second. (10-marks) b) The cycle efficiency. (10-marks) c) The cycle work ratio, Use TTD = -1.6oC. (10-marks) Note: Terminal temperature difference (TTD) = Saturated temperature of bleed steam – exit water from feed-heater temperature
A Rankine cycle with inlet steam at 90 bar and 500oC and condensation at 40oC produces
500MW. It has one stage of reheat, optimally placed, back to 500oC. One feedwater of the
closed type with drains cascade back to the condenser receives bleed steam at the reheat
pressure. The high and low pressure turbine sections have polytropic efficiencies of 82 and 90
percent, respectively. The pump has polytropic efficiency of 0.75. Calculate:
a) The mass flow rate of steam at the turbine inlet in kilograms per second. (10-marks)
b) The cycle efficiency. (10-marks)
c) The cycle work ratio, Use TTD = -1.6oC. (10-marks)
Note: Terminal temperature difference (TTD) = Saturated temperature of bleed steam – exit
water from feed-heater temperature
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