Consider the cycle described in Problem, but reverse the locations of the open feedwater heater and closed feedwater heater (i.e., the closed feedwater heater extraction pressure is 2 MPa and the open feedwater heater pressure is 500 kPa). The drain from the closed feedwater heater is throttled to 500 kPa and sent into the open feedwater heater. The pump after the condenser raises the water pressure to 500 kPa, and the pump after the open feedwater heater raises the pressure to 20 MPa. The feedwater exits the closed feedwater heater at a temperature of 210°C. Determine the fraction of the total mass flow rate extracted from the turbine for each feedwater heater, the net power of the cycle, and the thermal efficiency of the cycle if (a) the turbine and pumps are isentropic and (b) the turbine and pump isentropic efficiencies are both 0.80.
Problem
A Rankine cycle has both an open feedwater heater and a closed feedwater heater, with its drains cascaded back toward the condenser. Steam enters the turbine at a rate of 200 kg/s, and at 20 MPa and 600°C, and is extracted at 2 MPa to be sent to the open feedwater heater. Additional steam is extracted at 500 kPa and sent toward the closed feedwater heater. The water exits the condenser as a saturated liquid at 15 kPa, and the water exits the open feedwater heater as a saturated liquid at 2 MPa. The feedwater exiting the closed feedwater heater is at a temperature of 150°C. The pump following the condenser increases the pressure of the water to 2000 kPa, and the pump after the open feedwater heater increases the pressure to 20 MPa. Determine the fraction of the total mass flow rate extracted from the turbine for each feedwater heater, the net power of the cycle, and the thermal efficiency of the cycle if (a) the turbine and pumps are isentropic and (b) the turbine and pump isentropic efficiencies are both 0.80.
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