Consider a steam power plant that operates on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at 8 MPa and 450°C and leaves at 500 kPa. Steam is then reheated at constant pressure to 500°C before it expands to 10 kPa in the low-pressure turbine. Determine: a. The thermal efficiency of the cycle. b. Mass flow rate in boiler to produce a net work-output of 5 MW. c. Show this cycle on a T-s diagram with respect to pressure lines.

Consider a steam power plant that operates on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at 8 MPa and 450°C and leaves at 500 kPa. Steam is then reheated at constant pressure to 500°C before it expands to 10 kPa in the low-pressure turbine. Determine: a. The thermal efficiency of the cycle. b. Mass flow rate in boiler to produce a net work-output of 5 MW. c. Show this cycle on a T-s diagram with respect to pressure lines.

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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Question

Consider a steam power plant that operates on the ideal reheat Rankine cycle. Steam
enters the high-pressure turbine at 8 MPa and 450°C and leaves at 500 kPa. Steam is then reheated
at constant pressure to 500°C before it expands to 10 kPa in the low-pressure turbine. Determine:
a. The thermal efficiency of the cycle.
b. Mass flow rate in boiler to produce a net work-output of 5 MW.
c. Show this cycle on a T-s diagram with respect to pressure lines.

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PROBLEM: Steam power plant with ideal Rankine cycle. Steam enters the turbine at 4MPA and 700°C. The steam is cooled in the condenser at 20 kPa using cooling water. The net power output of the cycle is 100MW. Determine: a) The power produced by the turbine and consumed by the pump, b) thermal efficiency of the cycle, c) mass flow rate of the steam, and d) the mass flow rate of the condenser cooling water, if the cooling water enters the condenser at 15 °C and exits at 35°C. Draw the T-s diagram.
Thermodynamic
Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the actual specific enthalpy (kJ/kg) at the boiler inlet. (Use 2 decimal places for the final answer.)
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.
Determine the thermal efficiency
Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 8000 kPa, the reheat section at 1000 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 90 percent. Determine (a) the temperature at the inlet of each turbine, (b) the cycle's thermal efficiency, efficiency of this cycle. Assume a source temperature of 1500 K and a sink temperature of 295 K. (d) the second-law