Consider a combined gas (Brayton)-vapor (Rankine) power cycle. The water of the Rankine cycle is heated in a heat recovery steam generator (HRSG) starting as a compressed liquid at 40°C and 10MPa to a superheated steam condition at 480°C. Correspondingly, the gas from the Brayton cycle is cooled from 900K to 400K. The total heat added to this combined cycle is \( \dot{Q}_{in} = 100 \, \text{MW} \) and the thermal efficiency of this cycle is 53%. The gas turbine produces a specific net work of 4900 kJ/kg and the vapor cycle produces a specific net work of 9000 kJ/kg.Use cold-air standard analysis for the Brayton cycle, where \( k = 1.4 \), \( C_p = 1.0045 \, \text{kJ/kg} \cdot \text{K} \)Use tables for analysis for the Rankine cycle.Determine the following:(a) The ratio of the air mass flow rate in the gas cycle to the water mass flow rate in the vapor cycle, \( \dot{m}_g / \dot{m}_v \)(b) The mass flow rate of the water in the Rankine cycle, \( \dot{m}_v \)

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8. Consider a combined gas (Brayton)-vapor (Rankine) power cycle. The water of the Rankine cycle is heated in a heat recovery steam generator (HRSG) starting as a compressed liquid at 40°C and 10MPA to a superheated steam condition at 480°C. Correspondingly, the gas from Brayton cycle is cooled from 900K to 400K. The total heat added to this combined cycle is Qin=100 MW and the thermal efficiency of this cycle is 53%. The gas turbine produces specific net work of 4900 kJ/kg and the vapor cycle produces a specific net work of 9000 kJ/kg. Use cold-air standard analysis for the Brayton cycle, where k=1.4, Cp= 1.0045 kJ/kg·K Use tables for analysis for the Rankine cycle. Determine the following: (a) The ratio of the air mass flow rate in the gas cycle to the water mass flow rate in the vapor cycle, mg/M, (b) The mass flow rate of the water in the Rankine cycle, my

8. Consider a combined gas (Brayton)-vapor (Rankine) power cycle. The water of the Rankine cycle is heated in a heat recovery steam generator (HRSG) starting as a compressed liquid at 40°C and 10MPA to a superheated steam condition at 480°C. Correspondingly, the gas from Brayton cycle is cooled from 900K to 400K. The total heat added to this combined cycle is Qin=100 MW and the thermal efficiency of this cycle is 53%. The gas turbine produces specific net work of 4900 kJ/kg and the vapor cycle produces a specific net work of 9000 kJ/kg. Use cold-air standard analysis for the Brayton cycle, where k=1.4, Cp= 1.0045 kJ/kg·K Use tables for analysis for the Rankine cycle. Determine the following: (a) The ratio of the air mass flow rate in the gas cycle to the water mass flow rate in the vapor cycle, mg/M, (b) The mass flow rate of the water in the Rankine cycle, my

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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12 Th 04 A- A steam power plant operates on a simple ideal Rankine cycle The steam enters the turbine at pressure of 5 MPa and leaves at 10 kPa and 90% quality. The mass flow rate of steam through the cycle is 35 kg/s. Show the cycle on a T-s diagram and determine (a) the thermal efficiency of the cycle and (b) the net power output of the power plant.
A steady-state system for producing power consist of a pump, heat exchanger and a turbine. Watersteam power plant operates on an ideal reheat– regenerative Rankine cycle. Steam enters the highpressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some steam is extracted at thispressure to heat the feedwater in an open feedwater heater. The rest of the steam is reheated to500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. Determinethe entropy generation associated with the reheating and regeneration processes. Assume a sourcetemperature of 1800 K. please i so another solution for this qustion and they didn't do any calculation for state 4 can i know why?
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Steam at 6.155MPa and 435degC enters the turbine of a power plant which operates on actual vaport power cycle. The pressure at the exit of the turbine is 418 kPa, and steam leaves the condenser as a saturated liquid at 62degC. The pressure is increased to 12.2 MPa accross the pump. The turbine and pump have isentropic efficiencies of 82% and 74% respectively. For this cycle, determine th: a. Wnet per unit mass of steam flow and the heat transfer to steam passing through the boiler (kj/kg)b. thermal efficiency (%) c. heat transfer to colling water passing the condenser (kj/kg of steam condensed)
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T B A D Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid. Process A-B: A saturated mixture of water is pumped from low pressure to a high pressure saturated liquid in an iso- entropic (and adiabatic) process. Process B-C: The high pressure saturated liquid enters a boiler where it is heated at constant pressure process by an external heat source to a super-heated vapor. Process C-D: The super-heated vapor goes through a turbine, generating power exiting as a saturated vapor. Assume an iso-entropic (and adiabatic) process and neglect kinetic energy and potential energy changes. Process D-A: The saturated vapor then enters a condenser where it is condensed at a constant pressure process back to its original state. The boiler operates at 8 MPa (points B & C) and the condenser operates at 200 kPa (points A & D). Assume a mass flow rate of 1 kg/s. Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and…
A steady-state system for producing power consist of a pump, heat exchanger and a turbine. Watersteam power plant operates on an ideal reheat– regenerative Rankine cycle. Steam enters the highpressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some steam is extracted at thispressure to heat the feedwater in an open feedwater heater. The rest of the steam is reheated to500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. Determinethe entropy generation associated with the reheating and regeneration processes. Assume a sourcetemperature of 1800 K. Please Solve step by step.
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.
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A steam power plant operates on the reheat Rankine cycle. as shown in the schematic diagram (Fig. Q 2). Steam enters the high-pressure turbine at 12.5MPa and 550o C at a rate of 7.7 kg/s and leaves at 2 MPa. Steam is then reheated at constant pressure to 450o C before it expands in the low-pressure turbine. The isentropic efficiencies of the turbine and the pump are 85% and 90%, respectively. Steam leaves the condenser as a saturated liquid. If the moisture content of the steam at the exit of the turbine is not to exceed 5%, then make all the necessary assumptions and determine(a) the condenser pressure,(b) the net power output, and(c) the thermal efficiency.Draw an accurate T-s diagram of the cycle and label all the property values on this diagram.