Design a Rankine cycle with one reheater, one open feedwater heater, and two closed feedwater heaters with drains cascaded backward so that the cycle has a high thermal efficiency. The maximum temperature and pressure in the cycle are 600°C and 18 MPa. The condenser pressure is 10 kPa. The isentropic efficiency of the turbine is 0.80, and the isentropic efficiency of the pumps is 0.70. The net power to be produced by the cycle is 750 MW. In addition, determine the required external cooling water mass flow rate for a temperature increase through the condenser of 20°C.
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