1. Consider a Carnot cycle executed in aclosed system with air as the working fluid.The maximum pressure in the cycle is 1300kPa while the maximum temperature is 950K. If the entropy increase during theisothermal heat rejection process is 0.25kJ/kg-K and the network output is 100 kJ/kg,knowing that R= 0.287 kJ/kg.K and y= 1.4determine the minimum temperature in thecycle:Oa) 520 Kb) 530 KOc) 630 Kd) 4270 Ke) None of above

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Answered: 1. Consider a Carnot cycle executed in…

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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Consider a variation of the Carnot cycle in a closed system with 10 kg of pure water operating. ranging between temperatures of 130 C and 350 ◦C. State 1 is a saturated liquid. Process 1-2 is a isothermal expansion with a supply of QH = 10 MJ. Process 2-3 is an adiabatic expansion with isentropic efficiency from 0.75 to minimum temperature. Process 3-4 is a compression isothermal, and the 4-1 process is a reversible adiabatic compression. Calculate: a. The pressure p2, the bonds x4 and x3, and the specific entropies s1 and s3; b. The work in each expansion and compression process; c. The heat rejected QL, the net work produced Wl i q and the yield η of the cycle; d. The entropy generated Sg in the cycle
A four-cylinder, four-stroke, 2.2-L gasoline engine operates on the Otto cycle with a compression ratio of O. The air is at 100 kPa and 60°C at the beginning of the compression process, and the maximum pressure in the cycle is 8 MPa. The compression and expansion K, determine (a) the processes may be modeled as polytropic with a polytropic constant of 1.3. Using constant specific heats at temperature at the end of the expansion process, (b) the net work output and the thermal efficiency, (c) the mean effective pressure, (d) the engine speed for a net power output of 70 kW, and (e) the specific fuel consumption, in g/kWh, defined as the ratio of the mass of the fuel consumed to the net work produced. The air-fuel ratio, defined as the amount of air divided by the amount of fuel intake, is 16.
A heat engine operated as a reversible Carnot cycle using 1 kg of air as a working fluid between 500 degrees of a high heat source and 27 degrees of a low heat source is operated at 60 cycles per minute. If both the pressure P2 after isothermal expansion and the pressure P4 after isothermal compression are 30Pa, calculate how many kWh of the output power is generated during an hour by this cycle. Air gas constant : 0.287 J/kgK, specific ratio : 1.4 answer : 449.7 kWh
A Carnot Power Cycle Operates on 2 lb of air between the limits of 70°F and 500°F . The pressure at the beginning of the isothermal expansion is 400 psia and at the end of isothermal expansion is 185 psig. Determine a.the volume at the end of the isothermal compression b.Change in entropy during the isothermal process c.heat added
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Please include the figure, formulas used, and complete solution. Thank you!
Why is each step of the Carnot cycle reversible? I know that the processes in each of the four steps is reversible, but I'm not sure how to explain why they're reversible.
If one measurement is conducted in the four processes and shows that the pressure ratio (P3/P2)in the adiabatic expansion is 1.2 times the pressure ratio (P4/P1) in the adiabatic compression, can you justify if it is a Carnot engine? Please give your reason
An ideal gas turbine cycle consisting of 2 stages of compression and 2 stages of expansion has an overall pressure ratio of 9. Air enters the compressors at the temperature of 320 K while, being intercooled between the stages. Air enters the first compressor at 100 kPa and the pressure ratio of cach of the compressors are selected in a way that minimizes the total power input for the compressors. The high-pressure turbine (First one) drives the compressors and the low-pressure one produces power output. The compressors and both the high-pressure and low-pressure turbines can be assumed ideal. To increase the efficiency of the cycle a regenerator with effectiveness of 85% is used to recover some heat from the exhaust of the second turbine. In this cycle, air with the temperature of 1400 K enters the first turbine. After expansion in the first turbine, air is reheated to the same temperature at the inlet of the first turbine (1400 K). You can consider constant specific heats of c,=1.005…
Q.2/ Consider a Carnot cycle executed in a closed system with air as the working fluid. The maximum pressure in the cycle is 1300 kPa while the maximum temperature is 950 K. If the entropy increase during the isothermal heat rejection process is 0.25 kJ/kg·K and the network output is 100 kJ/kg, knowing that R= 0.287 kJ/kg.K and y= 1.4, what is the thermal efficiency of the cycle?

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