11- Consider a steam power plant that operates on the ideal regenerative Rankine cycle with a closed feedwater heater as shown in the figure. The plant maintains the turbine inlet at 3000 kPa and 350°C and operates the condenser at 20 kPa. Steam is extracted at 1000 kPa to serve the closed feedwater heater, which discharges into the condenser after being throttled to condenser pressure. Calculate the work produced by the turbine, the work consumed by the pump, and the heat supply in the boiler for this cycle per unit of boiler flow rate. Answers: 741 kJ/kg, 3.0 kJ/kg, 2353 kJ/kg Turbine Boiler 1-6 Closed FWH 8 Condenser Pump

11- Consider a steam power plant that operates on the ideal regenerative Rankine cycle with a closed feedwater heater as shown in the figure. The plant maintains the turbine inlet at 3000 kPa and 350°C and operates the condenser at 20 kPa. Steam is extracted at 1000 kPa to serve the closed feedwater heater, which discharges into the condenser after being throttled to condenser pressure. Calculate the work produced by the turbine, the work consumed by the pump, and the heat supply in the boiler for this cycle per unit of boiler flow rate. Answers: 741 kJ/kg, 3.0 kJ/kg, 2353 kJ/kg Turbine Boiler 1-6 Closed FWH 8 Condenser Pump

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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This is an Open feedwater not a closed feedwater thank you
Consider an ideal Rankine cycle with reheating as shown. Steam enters a high-pressure turbine at 6 MPa and 440°C and expands to 0.5 MPa then reheated to 400°C. The condenser pressure is 8 kPa. • Calculate the quality at the exit of the low-pressure turbine, x6 = • Calculate the work produced by the low-pressure turbine in kJ/kg • Calculate the heat transfer in reheating (greheat) in kJ/kg = Boiler Turbine 3 QH 5 Condenser 87.3% || 89.0%||| 91.1% | 94.3% || 95.9% || 99.0% 763 |805 || 832 || 851878 || 901 513 556| 581 665 | 697|| 758
Consider a steam power plant operating on a simple ideal Rankine cycle. Steam enters the turbine at 15 MPa and 650°C and is condensed in the condenser at a pressure of 15 kPa. Determine the thermal efficiency (%). (Use 2 decimal places for the final answer.)
Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C and is cooled in the condenser at a pressure of 7.5 kPa. Show the cycle on a T-s diagram with respect to saturation lines.
A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 10 MPa in Boiler the boiler and 10 kPa in the condenser and a turbine inlet temperature of 500°C. The boiler is sized to provide a steam flow of 165 kg/s. Determine: (a)(s) the quality of the steam at the turbine exit, (b) the thermal efficiency of the cycle, and (c) 2) the net power produced by the cycle Wa Condesser Turbine
Please show the solution. Thank you very mmuch
QI) Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of 45 MW. Steam enters the turbine at 6 MPa and 500°C and is cooled in the condenser at a pressure of 20 kPa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. Show the cycle on a T-s diagram with respect to saturation lines, and determine: The thermal efficiency of the cycle?
Scenario (1) The first steam power plant operates on an ideal reheat Rankine cycle. Steam enters the first turbine at 8 MPa and 500 C and leaves at 3 MPa. Steam is then reheated at a constant pressure to 500 C before it expands to 20 kPa in the low-pressure turbine. Assuming that heat is being added to the boiler from a high temperature source at 1800 K and the condenser is transferring heat to a temperature sink at 300 K. Task 1 Investigate the effect of changing pump efficiency on the overall thermal efficiency of the thermodynamics cycle (Hint: You will assume different values for the isentropic pump efficiency such as: 70%, 80%, 90%, 95%, and 100%, then observe how it will change the thermal efficiency of the cycle). Representing the results in a plot is recommended.
Scenario (1) The first steam power plant operates on an ideal reheat Rankine cycle. Steam enters the first turbine at 8 MPa and 500 C and leaves at 3 MPa. Steam is then reheated at a constant pressure to 500 C before it expands to 20 kPa in the low-pressure turbine. Assuming that heat is being added to the boiler from a high temperature source at 1800 K and the condenser is transferring heat to a temperature sink at 300 K. Task 1 Investigate the effect of changing turbine efficiency on the overall thermal efficiency of the thermodynamic cycle. (Hint: You will assume different values for the isentropic turbine efficiency such as: 70%, 80%, 90%, 95%, and 100%, then observe how it will change the thermal efficiency of the cycle). Representing the results in a plot is recommended.
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a steam power plant that operates on a reheat Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 500°C and the low-pressure turbine at 1 MPa and 500°C. Steam leaves the condenser as a saturated liquid at a pressure of 10 kPa. The isentropic efficiency of the turbine is 72 percent and that of the pump is 95 percent. Determine the quality (or temperature, if superheated) of the steam at the turbine exit. Use steam tables. (You must provide an answer before moving on to the next part.) The temperature of the steam at the turbine exit is °C.
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6400 kPa and the condenser at 70 kPa. At the entrance to the turbine, the temperature is 490 °C. The isentropic efficiency of the turbine is 84 %, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 6.7 °C. The boiler is sized for a mass flow rate of 18 kg/s. Determine the following values. (1) The temperature at the pump inlet. / 80.3 (2) The specific volume at the pump inlet. (3) The specific enthalpy at the turbine exit. X 346 (4) The rate at which heat is added in the boiler. (5) The power required to operate the pumps. (6) The net power produced by the cycle. (7) The thermal efficiency. o °C O m/kg O kJ/kg O kW O kW O kW 0.001030
3) An ideal Rankine cycle with superheat and reheat has steam entering the turbine at 10 MPa and 440 °C. The steam is extracted and sent to the reheater at a pressure of 1.5 MPa, and returns to the turbine at 440 °C. The condenser pressure is 20 kPa. The cycle produces 400 MW of net power. Determine (a) the qualities of steam at (i) high pressure turbine exit, and (ii) low pressure turbine exit (b) the thermal efficiency, in % (c) the rate of heat transfer, into the working fluid as it passes through the boiler, in MW (d) the rate of heat transfer, from the condensing steam as it passes through the condenser, in MW (e) the mass flow rate of the condenser cooling water, in kg/ h, if cooling water enters the condenser at 12 Cand exits at 37 C