Consider a regenerative Brayton cycle operating with a pressure ratioof 8, where the air enters the compressor at 300 K and 100 kPa, whileit enters the turbine at 1060 K. Assume that both the compressor andturbine are isentropic, that specific heats vary with temperature, andthat the regenerator has an effectiveness of 74%. Round allintermediate calculations to three decimal places. What is the enthalpyat the compressor outlet in kJ/kg? What is the enthalpy at the turbineoutlet in kJ/kg? What is the enthalpy at the entrance to the heatexchanger that accepts external heat kJ/kg? How much external heatis supplied to the cycle in kJ/kg? Round your answer to two decimalplaces. What is the enthalpy at the entrance to the heat exchangerthat rejects heat to the surrounding in kJ/kg? How much heat isrejected to the surroundings in kJ/kg? How much net work isproduced in kJ/kg? What is the thermal efficiency as a percentage (0%-100%)? What is the thermal efficiency as a percentage (0% - 100%) ifthere was no regenerator?

Answered: Image /qna-images/answer/2ffd3abf-fbdd-44a3-a2a6-c39f02e908a8.jpg

Answered: Consider a regenerative Brayton cycle…

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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If the compressor of a Brayton cycle gas turbine operates at a pressure ratio 24.9, and the rate of heat transfer during the heat addition process is 590 kW, what is the net work out from the device? Take the working fluid to be superheated steam with a specific heat ratio of 1.33, and give your answer in kW to one decimal place.
Two ideal Brayton cycles (see Figure below) have the same inlet temperature and the same maximum temperature of the turbine inlet. Brayton Cycle A has a higher compression ratio than Cycle B. Which of the following statements is true about the cycles? Cycle A has a higher thermal efficiency and Cycle B has a higher work net for a given mass flow rate. Cycle B has a higher thermal efficiency and a higher work net for a given mass flow rate. Since the temperatures are the same the efficiencies and work net are also the same. Cycle A has a higher work net for a given mass flow rate and Cycle B has a higher thermal efficiency. Cycle A has a higher thermal efficiency and a higher work net for a given mass flow rate.
Required information Problem 09.015 - 3-Step Air-Standard Cycle with Constant Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS An air-standard cycle with constant specific heats at room temperature is executed in a closed system with 0.003 kg of air and consists of the following three processes: 1-2 v= Constant heat addition from 95 kPa and 17°C to 380 kPa 2-3 Isentropic expansion to 95 kPa 3-1 P = Constant heat rejection to initial state The properties of air at room temperature are cp = 1.005 kJ/kg-K, cy= 0.718 kJ/kg-K, and k = 1.4. Problem 09.015.b - Net Work for Constant Heat Capacity Air-Standard Cycle Calculate the net work per cycle, in kJ. (You must provide an answer before moving on to the next part.) The net work per cycle is kJ.
What are the main reasons for running jet engines at high temperatures? Select one or more: a. Increased fuel burn b. Greater thermal creep c. Increased efficiency d. Higher thrust e. Decreased noise
Required information Problem 09.052 - Ideal Diesel Cycle with Variable Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 103 kPa and 27°C. Account for the variation of specific heats with temperature. The gas constant of air is R= 0.287 kJ/kg-K. Problem 09.052.b - Thermal Efficiency in Variable Heat Capacity Diesel Cycle Determine the thermal efficiency. (You must provide an answer before moving on to the next part.) The thermal efficiency is 59.38 %.
The displacement volume of an internal combustron engine is 5.6 liters. The processes within each cylinder of the engine are modeled as an air-standard Diesel cycle with a cutoff ratio ß of 2.4. The state of the air at the beginning of compression is fixed by P 95 kPa, T= liters. For air, take specific heat ratio y 1.4, and R 0.287 kJ kg.K. Determine the net work per cycle, in kl. //int find the temperatures at all states and apply Ocycle= Weycle) b. If the net work per cycle is equal to 4.78 kJ. determine the indicated mean effeetive pressure in kPa, Determine the thermal efficiency. d. Determine the power developed by the engine, in kW, if the cycle is executed 1500 times 27°C, and V = 6.0 a. C. per min

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