Superheated steam at 7.585 MPa (1100 psia) and 616.3 K (650 F) enters the high-pressure turbine of an ideal regenerative Rankine cycle. The cycle is equipped with a moisture separator, delivering saturated water to an open feedwater heater at 0.689 MPa (100 psia). Saturated steam from the feedwater heater enters the low-pressure turbine. Pressure in the condenser is 7 kPa (1 psia). The condensate leaving the open feedwater heater is saturated water. Find a) the cycle thermal efficiency, b) the work per unit mass flow rate of water consumed by the condensate pump, c) the work per unit mass flow rate of water consumed by the feedwater pump, d) the work per unit mass flow rate of water produced by the high-pressure turbine, e) the work per unit mass flow rate of water produced by the low-pressure turbine, f) the heat per unit mass flow rate of water delivered to the heat source and g) the fraction of steam used as the extracted steam in the open feedwater heater.
Superheated steam at 7.585 MPa (1100 psia) and 616.3 K (650 F) enters the high-pressure turbine of an ideal regenerative Rankine cycle. The cycle is equipped with a moisture separator, delivering saturated water to an open feedwater heater at 0.689 MPa (100 psia). Saturated steam from the feedwater heater enters the low-pressure turbine. Pressure in the condenser is 7 kPa (1 psia). The condensate leaving the open feedwater heater is saturated water. Find a) the cycle
thermal efficiency, b) the work per unit mass flow rate of water consumed by the condensate pump, c) the work per unit mass flow rate of water consumed by the feedwater pump, d) the work per unit mass flow rate of water produced by the
high-pressure turbine, e) the work per unit mass flow rate of water produced by the low-pressure turbine, f) the heat per unit mass flow rate of water delivered to the heat source and g) the fraction of steam used as the extracted steam in the open feedwater heater.
[Ans.: 41.1%, 0.465 kJ/kg, 7 kJ/kg, 469 kJ/kg, 474.7 kJ/kg,
2278.7 kJ/kg, 20.5%].
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