Chapter 8, Problem 8.38P

Water is the working fluid in an ideal Rankine cycle with reheat. Superheated vapor enters the turbine at 10 MPa, 320°C, and the condenser pressure is 8 kPa. Steam expands through the first-stage turbine to 1 MPa and then is reheated to 320°C. Determine for the cyclea. the heat addition, 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.

1. In a reheat cycle steam at 15 MPa, 500oC enters the engine and expands to 2 MPa. At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 500oC. Expansion now occurs to the condenser pressure of 5 kPa. The steam flow is 150000 kg/hr, the generator efficiency is 96%, mechanicalefficiency of 80% and indicated steam rate of 5.5 kg/kWh. For actual engine, find the following:a. output power in kWb. brake steam ratec. brake thermal efficiencyd. combined engine efficiency 2. An ideal reheat Rankine cycle operates between 8 MPa and 5 kPa with a maximum temperature of 600oC. Two reheat stages, each with a maximum temperature of 600oC are to be added to 2 MPa and 100 kPa. Calculate:a. turbine workb. heat added in the boilerc. heat added in the reheaterd. thermal efficiency

Water is the working fluid in an ideal Rankine cycle. Superheated vapor enters the turbine at 10 MPa, 550 degree Celsius. The condenser pressure is 10 kPa. The cycle is modified to include one open feedwater heater operating at 0.7 MPa. Saturated liquid exits the feedwater heater at 0.7 MPa. The new power output of the cycle is 150 MW. Determine for the cycle the rate of heat transfer to the working fluid passing through the steam generator, in kW, (b) the thermal efficiency.

An Actual Rankine cycle operates on a boiler and condenser pressure of 2MPa and 20kPa respectively. Steam leaves the boiler at 500°C. The cycle produces a Net Power of 10MW. a.) Determine the steam rate of the turbine. (kg/kW-hr)  b.) Determine the steam rate of the turbine. (kg/kW-hr) c.) Determine the heat rate of the cycle (kJ/kW-hr) ROUND OFF ANSWER TO SIX SIGNIFICANT FIGURES

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Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.? and 1000°F and expands to 120 Ibf/in.?, where some of the steam is extracted and diverted to the closed feedwater heater. The remaining steam expands through the second-stage turbine to the condenser pressure of 5 lbf/in.² Each turbine stage and the pump have isentropic efficiencies of 90%. Flow through the condenser, closed feedwater heater, and steam generator is at constant pressure. Condensate exiting the feedwater heater as saturated liquid at 120 lbf/in.? undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 140O Ibf/in.? and a temperature equal to the saturation temperature at 120 lbf/in.2 The net power output of the cycle is 1x 10° Btu/h. Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in Ib/h. (b) the rate of heat transfer, in Btu/h, to…

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4) In a reheat Rankine cycle, water vapor enters the high-pressure turbine at 9MPa and 450°C. It is expanded to an intermediate pressure of 0.8MPa and enters the low-pressure turbine with a temperature of 400°C. Condenser pressure is 7.5kPa and water enters the pump as a saturated liquid. There is no pressure loss in the piping that connects the cycle components. Water mass flow rate is 60 kg/s and both turbines have an isentropic efficiency of 90%. Calculate mankan kunne tħe b) net power output, in MW