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  3. analyzing regenerative cycles for the cycle of problem 860 investigate...

Question: analyzing regenerative cycles for the cycle of problem 860 investigate...

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Analyzing Regenerative Cycles For the cycle of Problem 8.60, investigate the effects on cycle performance as the higher extraction pressure takes on other values. The operating conditions for the open feedwater heater are unchanged from those in Problem 8.60. Assume that condensate drains from the closed feedwater heater as saturated liquid at the higher extraction pressure. Also feedwater leaves the heater at 12 MPa and a temperature equal to the saturation temperature at the extraction pressure. Construct suitable plots and discuss 8.60 Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open one, as shown in Fig. P8.60. Steam enters the first turbine stage at 12 MPa, 480°C, and expands to 2 MPa. Some steam is extracted at 2 MPa and fed to the closed feedwater heater. The remainder expands through the second-stage turbine to 0.3 MPa, where an additional amount is extractedand fed into the open feedwater heater operating at 0.3 MPa. The steam expanding through the third-stage turbine exits at the condenser pressure of 6 kPa. Feedwater leaves the closed heater at 210°C, 12 MPa, and condensate exiting as saturated liquid at 2 MPa is trapped into the open feedwater heater. Saturated liquid at 0.3 MPa leaves the open feedwater heater. Assume all pumps and turbine stages operate isentropically. Determine for the cycle (a) the heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam entering the first stage turbine. (b) the thermal efficiency (c) the heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.

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