Required information Problem 09.119C - Replacing Single-Stage Compression with Multistage Compression The single-stage compression process of an ideal Brayton cycle without regeneration is replaced by a multistage compression process with intercooling between the same pressure limits. Problem 09.119C.a - Effect of Multistage Compression on Compressor Work As a result of this modification, does the compressor work increase, decrease, or remain the same? Multiple Choice It will remain the same. It will increase It will decrease.

Required information Problem 09.119C - Replacing Single-Stage Compression with Multistage Compression The single-stage compression process of an ideal Brayton cycle without regeneration is replaced by a multistage compression process with intercooling between the same pressure limits. Problem 09.119C.a - Effect of Multistage Compression on Compressor Work As a result of this modification, does the compressor work increase, decrease, or remain the same? Multiple Choice It will remain the same. It will increase It will decrease.

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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Task (1) A Brayton cycle with regeneration operates with a pressure ratio of 7. The minimum and maximum cycle temperatures are 300 K and 1000 K. The isentropic efficiency of the compressor and turbine are 80% and 85%, respectively. The effectiveness of the regenerator is 75%. Use constant specific heats evaluated at room temperature. 1. Calculate the Back-work ratio. 2. Determine the net-work output of the cycle. 3. Calculate the thermal efficiency of the cycle. 4. Now assume that both compression and expansion processes in the compressor and turbine are isentropic. Calculate the thermal efficiency of the ideal cycle.
Q3) A constant volume fuel – air cycle with a compression ratio of 8, the A/F=15:1. The pressure before the exhaust valve open is 4.0 bar . The temperature and pressure at the beginning of compression stroke is 1 bar and 60oC . The calorific value of fuel is 44000 kJ/kg. Determine the maximum cycle temperature and pressure if the index of compression is 1.32 and the specific heat at constant volume is Cvp = 0.68+0.0003T.
QUESTION 26 Air enters the compressor of an ideal air-standard Brayton cycle at 100 kPa, 300 K, with a volumetric flow rate of 5 m³/s. The compressor pressure ratio is 10. The turbine inlet temperature is 1400 K. The diagram that shows the operation of the system is figure (A,B.....not in the diagram) and the heating and cooling are (name the component). A с pom (b) T-s diagram D B E High Depart (example adiabatic, isothermal...) processes. The work output is from the
At the beginning of compression, Otto cycle works on 0.2 lb/s of air at 14 psia and 1300F. The temperature at the completion of combustion is 45000R, the compression ratio is 5.5, and the hot-air standard is k = 1.3. a. Find V1 , P2 , T2 , P3 , V3 , T4b. Compute the heat added (QA),heat rejected (QR), work (W) andthe cycle efficiency (e).
Problem # 2 2.)An ideal Otto cycle has a percent clearance of 13.70%...At the beginning of Isentropic compression process, air is at 100Kpa and 25 degrees Celsius …1000KJ/Kg of heat is transferred during Isometric heat addition process …. Determine: a.)Find the compression ratio? Solution: Answer:________________________________ b.)Find the highest temperature of the cycle in degrees Celsius? Solution: Answer:________________________________ c.)Find the highest pressure in the cycle in Kpa? Solution: Answer:________________________________
A 4 liter (2 liter per revolution at standard pressure and temperature) spark ignition has a compression ratio of 8 and 2000 KJ/kg heat addition by the fluid combustion. Considering a cold air standard Otto cycle model, how much power(kw) will the engine produce when operating at 2500rpm?
! Required information Consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200 K. Use variable specific heats. Determine the back work ratio and the thermal efficiency of the cycle, assuming a regenerator with 79 percent effectiveness is used. The back work ratio is The thermal efficiency is [ %. 1%.
Required information Problem 09.114 - Regenerative Brayton Cycle with Effectiveness using Variable Specific Heats - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS Air enters the compressor of a regenerative gas turbine engine at 310 K and 100 kPa, where it is compressed to 900 kPa and 650 K. The regenerator has an effectiveness of 78 percent, and the air enters the turbine at 1400 K. Assume variable specific heats for air. Problem 09.114.a - Regenerator Heat in a Gas-Turbine Engine Using Variable Heat Capacities For a turbine efficiency of 90 percent, determine the amount of heat transfer in the regenerator. (You must provide an answer before moving on to the next part.) The amount of heat transfer in the regenerator is kJ/kg.
Consider the operation of the ideal Brayton cycle with a regenerator. The maximum temperature in the cycle is set. What happens with increasing pressure ratio? Group of answer choices The amount of heat added in the cycle up to a point will decrease with net work output remaining the same and thermal efficiency will increase. Thermal efficiency will increase Compressor exit temperature will increase with turbine exit temperature remaining the same. When the two temperatures are equal, the benefit of the regenerator will be zero. Thermal efficiency will decrease
True or False 1) In a Rankine Cycle, real work produced by the turbine is less that the isentropic work. 2) A valve (throttling) and ideal pump both operate isenthalpically 3)For a given TC and TH, the vapor compression cycle has a higher COP than the Carnot cycle. Group of answer choices
Draw and label the P-V and T-S diagrams. In an ideal Brayton cycle, air enters the compressor section at 14.7 psia and 55°F. The pressure ratio is 12. Turbine inlet condition of 1300°F. Determine the following:a. Pressure, specific volume & temperature at each stateb. Compression ratio
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 %.