Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Provide complete solution and diagram for below problem.
A Brayton cycle has a pressure ratio of 8 and initial temperature of 32oC. Its compressor work
is:
A. 165.50 KJ/kg B. 182.34 KJ/kg C. 213.45 KJ/kg D. 247.50 KJ/kg
Answer: D
Transcribed Image Text:19. A Brayton cycle has a pressure ratio of 8 and initial temperature of 32°C. Its compressor work
is:
A. 165.50 KJ/kg
Answer: D
B. 182.34 KJ/kg C. 213.45 KJ/kg D. 247.50 KJ/kg
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- 5. (a) If the compression ratio of an engine working on Otto cycle isIncreased from 5 to 7, find the percentage increase in thermalefficiency. (b) Derive an expression for thermal efficiency of ideal Brayton cycle.(c) In an engine working on the ideal Otto cycle, the pressure and temperature at the beginning of compression are 100 kPa and 40 °C respectively. The ratio of specific heat capacities is 1.4. If the airstandard efficiency of the engine is 50%, determine(i) The compression ratio. (ii) The pressure and temperature at the end of adiabaticcompression. (6a) Explain and discuss in your own words, the following three concepts incombustion: stoichiometric mixture of air and fuel, weak mixture and richmixture. Explain their importance in combustion applications.(6b) A gas fuel has the following volumetric composition:Propane C3H8: 73 %Butane C4H10: 5 %Ethane, C2H6: 3%Nitrogen N2: 19%(i) Write out the complete combustion equations for all the combustible constituents individually.…arrow_forwardWrite legibly, provide manual step by step solution, and diagram for below given problem. A Rankine cycle has an initial mass of liquid flowing at 10 kg at 75. If final enthalpy is 379.6 KJ, find the change of the system. a. 655.75 KJ c. 763.45 KJ b. 834.34 KJ d. 934.56 KJarrow_forwardthe back work ratio and the thermal efficiency of the cycle assuming a regenerator with 75 and constant specific heats is used with C0.718 kJ/kg.K and C1.005 kJ/kg.K. Determine expansion. The pressure ratio across cach stage of the compressor and turbine is 3. The air Q2: Consider an ideal gas-turbine cycle with two stages of compression and two stages of kinetic and potential energy changes are negligible. The air standard assumptions are applicable enters cach stage of the compressor at 300 K and each stage of the turbine at 1200 K. The percent effectiveness is used.arrow_forward
- A gasoline internal combustion engine can be modeled by an ideal Otto cyclethat has a compression ratio of 8.91. At the beginning of the compression process (state 1), airis at 100 kPa and 300 K. The heat transfer into the air during the constant-volume heat additionprocess (state 2 to 3) is 693.08 kJ/kg. Note: Consider constant specific heats of air at 300 K. 1 – Find the temperature in K before heat additionprocess ;A) 660 KB) 680 KC) 700 KD) 720 K 2 – Find the maximum temperature in K during thecycle A) 1625 KB) 1655 KC) 1685 KD) 1715 K3 – Find the maximum pressure in MPa during the cycle A) 4 MPaB) 4.5 MPaC) 5 MPaD) 5.5 MPa4 – Find the temperature in K before the heat rejection processA) 660 KB) 700 KC) 740 KD) 780 Karrow_forwardFINALS PROJECT IN ME 3215 COMBUSTIONMENGINEERING PROBLEM: wwww. A regenerative-reheat gas turbine with intercooling between turbine stages is shown in figure. Air enters at 100 kPa, 300 K with a mass flow rate of 5.807 2. The pressure ratio across the two-stage compressor is 10. The pressure ratio across the two-stage turbine is 10. The intercooler and reheater sec each operate at 300 kPa. At the inlets to the Turbine stages, the temperature is 1400 K. The temperature inlet to the second compressor stage is 300 K. The polytropic efficiency of each compressor and turbine stage is 80 %. The regenerator effectiveness is 80 %. čp = 1.005 k) . k = kg-K 1.4 Determine a. The Compressor work, in b. The Turbine work, in - ka air kg air ki c. The Net cycle work, in - ka air d. The thermal efficiency, in percent e. The work ratio f. The The net power developed, in kW 8. Draw the corresponding cycle diagram on the pv plane.arrow_forwardExample-1: In a Brayton cycle, the air at the inlet is at 27°C, 0.1 MPa. The pressure ratio is 6.25 and the maximum temperature is 800°C. Find (a) The compressor work per kg of air (b) The turbine work per kg or air (c) The heat supplied per kg of air (d) The cycle efficiency. Solution: T₁ = 27°C = 300 K P₁ = 100 kPa r₂ = 6.25 T3 = 800°C = 1073 K T N T Isobaric qin qoutarrow_forward
- Provide the given, manual step by step solution, and diagram. A Carnot cycle has an efficiency of 60 %. The heat added is 1000 KJ.What is the heat rejected from the cycle?arrow_forwardcan you draw and schematic and t-s fiagram for this actual reheat rankine cycle State 1: Status: Saturated Liquid 30 kPa From Table A5 when ʋ1=ʋf = 0.001022 m3/kg h1=hf = 289.27 kJ/kg State 2a: Status: Compressed liquid P2s=PH= 6000 kPa h2a= 296.04 kJ/kg [ WP, ise= Wpact = State 3 Status: Superheated Steam P3=PH=6000kpa T3=Tmax= 550°C From Table 6A, When = 6000 kPa and =550 =3423.1 kJ/Kg =6.8826 kJ/Kg⸼Karrow_forwardOn the diagram below sketch a basic Rankine cycle with superheating. Assume that there are irrevesibilities in the turbine and pump. Identify the device associate with each process. Make sure to label: the states and include important features, e.g. lines of constant temperature, volume, pressure, entropy, vapor dome, etc.arrow_forward
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