Please help :) A four-cylinder, four-stroke, spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a totaldisplacement volume of 1.8 L. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is1.1 kJ per cycle per cylinder. The gas constant of air is R = 0.287 kJ/kg-K and use constant specific heats with cv = 0.821kJ/kg-K, Cp 1.108 kJ/kg-K, and k=1.35.Determine the net work per cycle per cylinder and the thermal efficiency of the cycle.0.3408kJ.The net work per cycle per cylinder isThe thermal efficiency of the cycle is31 *

Given data:- Spark ignition or Otto engine cycle Compression ratio (r)=11 Heat input per cycle per…

Answered: A four-cylinder, four-stroke,…

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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1.An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 105 kPa and 28 °C, and 850 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Taking into account the variation of specific heats with temperature, determine (i) the pressure and temperature at the end of the heat addition process, (ii) the net work output, (iii) the thermal efficiency, and (iv) the mean effective pressure for the cycle.
A spark-ignition engine has a compression ratio of 10, an isentropic compression efficiency of 85 percent, and an isentropic expansion efficiency of 90 percent. At the beginning of the compression, the air in the cylinder is at 13 psia and 60°F. The maximum gas temperature is found to be 2300°F by measurement. Determine the heat supplied per unit mass, the thermal efficiency, and the mean effective pressure of this engine when modeled with the Otto cycle. Use constant specific heats at room temperature. The properties of air at room temperature are R = 0.3704 psia·ft3/lbm·R, cp = 0.240 Btu/lbm·R, cv = 0.171 Btu/lbm·R, and k = 1.4. Question: The heat supplied per unit mass is ___________.Btu/lbm. The thermal efficiency is_________________%. The mean effective pressure is________________.psia.
Consider an air-standard Otto cycle that has a compression ratio of 9.0 and a heat addition of 870 Btu/lbm. If the pressure and temperature at the beginning of the compression process are 14.0 psia and 40 °F, determine a. the maximum pressure and temperature for the cycle, b. the thermal efficiency, and c. the mean effective pressure, in psia
If the isentropic compression ratio of a Carnot cycle is 5 and the lower temperature limit of the cycle is 25C, determine the power that the engine can produce if the heat added amounts to 45kW. Assume that the cycle is an air standard cycle.a. 21.3609kW b. 21.3610kW c. 21.3611kW d. 21.3612kW
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. Determine the back work ratio and the thermal efficiency of the cycle, assuming no regenerator is used.
A Diesel cycle has a compression ratio of 22 and begins its compression at 85 kPa and 15°C. The maximum cycle temperature is 1200°C. Utilizing air-standard assumptions, determine the thermal efficiency of this cycle using variable specific heats.
An Otto cycle with a compression ratio of 8 begins its compression at 94 kPa and 10°C. The maximum cycle temperature is 900°C. Utilizing air-standard assumptions, determine the thermal efficiency of this cycle using variable specific heats
An air standard diesel cycle has a compression ratio of 13 and a peak combustion temperature of 1681.55C. If the heat rejected by the engine amounts to 3kW, determine the theoretical output power that can be produced by the engine.a. 3.8552kW b. 3.8553kW c. 3.8551kW d. 3.8550kW
A spark- ignition engine operates on an Otto cycle with a compression ratio of 9 and a temperature limits of 30°C and 1000°C. If the power input is 500 kw, calculate the mass flow rate of air.
An ideal Diesel cycle has a maximum cycle temperature of 2000°C. The state of the air at the beginning of the compression is P1 = 95 kPa and T1 = 15°C. This cycle is executed in a four-stroke, eight-cylinder engine with a cylinder bore of 10 cm and a piston stroke of 12 cm. The minimum volume enclosed in the cylinder is 5 percent of the maximum cylinder volume. Determine the power produced by this engine when it is operated at 1600 rpm. Use constant specific heats at room temperature.
An Otto cycle with a compression ratio of 8 begins its compression at 94 kPa and 10°C. The maximum cycle temperature is 900°C. Utilizing air-standard assumptions, determine the thermal efficiency of this cycle using constant specific heats at room temperature.
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 750 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Taking into account the variation of specific heats with temperature, determine:(a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle.

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