Needs Complete typed solution with 100 % accuracy. 7. An air standard Otto cycle at the start of the isentropic compression has P₁ = 100 kPa and T₁= 27°C. The compression ratio is 10 and during the heat addition process 1000 kJ/kg aresupplied. Using the cold air standard analysis method, the net work for this cycle is mostnearly equal to:A. 960 kJ/kgB. 900 kJ/kgC.602 kJ/kgD. 333 kJ/kgE. Cannot be determined with the given information.

The compression ratio of the Otto cycle:r = 10• The pressure at the beginning of the compression: P1…

Answered: 7. An air standard Otto cycle at the…

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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One kilogram of a perfect gas (air) is used as a working substance in a Carnot power cycle. At thebeginning of isentropic compression, the temperature is 326 o K and the absolute pressure is 359 kPa. Theabsolute pressure at the end of the isentropic compression is 1,373 kPa. For this cycle, the isothermalexpansion ratio (v 3 /v 2 ) is 2.0. For the cycle, calculate the heat supplied, kJ/kg.A., heat rejected, and the network
The compression ratio of an air-standard Otto cycle is 9.5. Assume the start of isentropic (reversible adiabatic) compression is state point 1. Prior to the isentropic compression process, the air is at 100 kPa, 35°C, and 600 cm3. The temperature at the end of the isentropic (reversible) expansion process is 800 K. Take the average values of the specific heat capacities, cP = 1.005 kJ/(kg·K) and cv = 0.718 kJ/(kg·K). (a) Draw the Otto cycle on both the P-v and T-s diagrams. Determine the: (b) highest temperature (in K) and pressure (in kPa) in the cycle, (c) amount of total heat transferred in, in kJ, (d) thermal efficiency, and (e) mean effective pressure in kPa.
The compression ratio of an air-standard Otto cycle is 9.5. Assume the start of isentropic (reversible adiabatic) compression is state point 1. Prior to the isentropic compression process, the air is at 100 kPa, 35°C, and 600 cm3. The temperature at the end of the isentropic (reversible) expansion process is 800 K. Take the average values of the specific heat capacities, cP = 1.005 kJ/(kg·K) and cv = 0.718 kJ/(kg·K). (a) Draw the Otto cycle on both the P-v and T-s diagrams. Determine the: (b) highest temperature (in K) and pressure (in kPa) in thecycle, (c) amount of total heat transferred in, inkJ, (d) thermal efficiency, and (e) mean effective pressure in kPa.
In an Otto cycle, the volume at the beginning of the isentropic compression is 0.74 L. If the displaced volume of the cycle is 0.68 L, the specific heat ratio is y=1.3 and the work done is 455.6 kj/kg, the heat rejected in kj per kg of air is?
In a cold-air standard diesel cycle, the volume of the cylinder amounts to 85 cm3 at the beginning of the heat addition process, 175 cm3 at the end, and 1300 cm3 at the beginning of the heat rejection process. If air is at 19.5°C and 118 kPa at the end of the heat rejection process, determine the (a) thermal efficiency, in % (b) mean effective pressure, in kPa (c) the pressure at the end of the isentropic expansion process, in kPa. Illustrate the T-s and P-? diagrams. Use ??= 0.718 kJ/kg-K, ??= 1.005 kJ/kg-K and ?= 1.4, where applicable. Use g = 9.81 m/s2 or 32.2 ft/s2 , T(K)=T(°C)+273 and T(R)=T(°F)+460, where applicable
An air-standard Diesel cycle has a maximum temperature of 1800 K. At the beginning of compression, p1 = 95 kPa and Tq = 300 K. The mass of airis 12 g. For a compression ratio of 15, determine (a) the net work of the cycle, in kJ. (b) the thermal efficiency. (c) the mean effective pressure, in kPa.
2. The compression ratio of an air-standard Otto cycle is 9.5. Prior to the isentropic compressionprocess, the air is at 100 kPa, 35°C, and 600 cm3. The temperature at the end of the isentropicexpansion process is 800 K. Using specific heat values at room temperature, determine (a) thehighest temperature and pressure in the cycle; (b) the amount of heat transferred in, in kJ; (c)the thermal efficiency; and (d) the mean effective pressure.
At the beginning of the compression process of an air-standard Otto cycle, P1=1bar, T1=290K, V1=400cm3. The maximum temperature in the cycle is 2200K and the compression ratio is 8. Determine the (a) heat addition, in kJ, (b) ????, in kJ, (c) thermal efficiency, and (d) mean effective pressure, in kPa. Consider the cycle as a model of the processes in each cylinder of a spark-ignition engine. Determine the (e) net power output, in kW, if the engine has four cylinders and the cycle is repeated 1200 times per minute in each cylinder. Also, (f) show the T-s and P-? diagrams. Note that the specific heats are NOT constant.
On my online homework, it says the answer for part b, 40.156% is incorrect. Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.35. The compression ratio is 10 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle (see image below). (b) the percent thermal efficiency. (c) the mean effective pressure, in bar.
A Diesel cycle has a compression ratio of 22 and begins its compression at 87 kPa and 15°C. The maximum cycle temperature is 1200°C. Utilize air-standard assumptions. The properties of air at room temperature are R = 0.287 kPa·m3/kg·K, cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, and k = 1.4. Determine the thermal efficiency of this cycle using variable specific heats at room temperature. Use data from the tables. The thermal efficiency of this cycle is?
At the beginning of the compression process of an air-standard Otto cycle, P1=1bar, T1=290K, V1=400cm3. The maximum temperature in the cycle is 2200K and the compression ratio is 8.00. Determine the (a) heat addition, in kJ, (b) ????, in kJ, (c) thermal efficiency, and (d) mean effective pressure, in kPa. Consider the cycle as a model of the processes in each cylinder of a spark-ignition engine. Determine the (e) net power output, in kW, if the engine has four cylinders and the cycle is repeated 1200 times per minute in each cylinder. Note that the specific heats are NOT constant.
At the beginning of the compression process of an air-standard Otto cycle, p1 = 100 kPa, T1 = 290 K, V1 = 400 cm3. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine the (a) thermal efficiency; and (b) mean effective pressure, in bar. (c) Solve on a cold air-standard basis with constant specific heats.

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