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, \( \dot{m}_v \)

Answered: Image /qna-images/answer/07f924a6-aced-4df6-955c-f3d1ae8960c3.jpg

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

See similar textbooks

Similar questions

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?
I need the answer as soon as possible
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)
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.
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.
Consider a water-ammonia binary vapor cycle consisting. In the steam cycle, superheated vapor enters the turbine at 7 MPa, 450C, and saturated liquid exits the condenser at 55C. The heat rejected from the steam cycle is provided to the ammonia cycle, producing saturated vapor at 45C, which enters the ammonia turbine. Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of 24 MW from the binary cycle, determine (a) the mass flow rates for the steam and ammonia cycles, respectively, in kg/s, (b) the power output of the steam and ammonia turbines, respectively, in MW. (c) the rate of heat input to the ammonia cycle, in MW, (d) the rate of heat addition to the binary cycle, in MW, and (e) the thermal efficiency of the binary vapor cycle.
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.