4. 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-volumeheat-addition process. Using constant specific heats at room temperature, determine (a) thepressure and temperature at the end of the heat-addition process, (b) the net work output, (c) thethermal efficiency, and (d) the mean effective pressure for the cycle.

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Answered: 4. An ideal Otto cycle has a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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3. An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95kPa 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. table 3 ideal-gas propermes or air T, K h, kJ/kg u, kJ/kg Pr 1.3860 214.07 300 300.19 670 24.46 681.14 680 691.82 25.85 778.18 39.27 760 780 800.03 43.35 1520 1660.23 636.5 1540 1684.51 672.8 Vr sº, kJ/(kg. K) 621.2 488.81 78.61 496.62 75.50 560.01 55.54 576.12 51.64 1223.87 6.854 1242.43 6.569 1.70203 2.52589 2.54175 2.66176 2.69013 3.46120 3.47712
An ideal Otto cycle has a compression ratio of 8. At the beginning of the Compression process, air is at 100 kPa and 17°C, and 800 kJ/kg of heat is Transferred to air during the constant-volume heat-addition process. (a) the maximum temperature and pressure that occur during the cycle, (b) The net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. P. kPa Isentropic 4 in Isentropic 100 Jour V₁ = V₁
H.W 1: 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 heataddition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle.
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 800 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg.K. Determine the net work output. (You must provide an answer before moving on to the next part.) The net work output is 0 kJ/kg.
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 800 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg.K. Determine the thermal efficiency. (You must provide an answer before moving on to the next part.) The thermal efficiency is 0 %.
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.
3. An air-standard Diesel cycle has a compression ratio of 18.2. Air is at 27oC and 100 kPa at the beginning of the compression process and at 1700 K at the end of the heat-addition process. Using constant specific heats at room temperature, determine (a) the cutoff ratio, (b) the heat rejection per unit mass, and (c) the thermal efficiency. Illustrated and give the correct answer
An ideal Otto cycle has a compression ratio of 8. At the beginning of thecompression process, air is at 100 kPa and 170C, and 800 kJ/kg of heat is transferredto air during the constant-volume heat-addition process. Accounting for thevariation of specific heats of air with temperature, determine (a) the maximumtemperature and pressure that occur during the cycle, (b) the net work output, (c)the thermal efficiency, and (d) the mean effective pressure for the cycle. (e) Also,determine the power output from the cycle, in kW, for an engine speed of 4000 rpm(rev/min). Assume that this cycle is operated on an engine that has four cylinderswith a total displacement volume of 1.6 L.
(b) Consider a simple ideal Brayton cycle with air as the working fluid. The pressure ratio of the cycle is 7.2, and the minimum and maximum temperatures are 300 K and 1350 K, respectively. Now the pressure ratio is doubled without changing the minimum and the maximum temperatures in the cycle. Assuming constant specific heats for air at room temperature; i. show the initial process and process change in a T-s diagram; ii. calculate the change in the net work output per unit mass; and
(b) Consider a simple ideal Brayton cycle with air as the working fluid. The pressure ratio of the cycle is 7.2, and the minimum and maximum temperatures are 300 K and 1350 K, respectively. Now the pressure ratio is doubled without changing the minimum and the maximum temperatures in the cycle. Assuming constant specific heats for air at room temperature; i. show the initial process and process change in a T-s diagram; ii. calculate the change in the net work output per unit mass; and iii. determine the change in thermal efficiency of the cycle.
Consider a simple ideal Brayton cycle with air as the working fluid. The pressure ratio of the cycle is 7.2, and the minimum and maximum temperatures are 300 K and 1350 K, respectively. Now the pressure ratio is doubled without changing the minimum and the maximum temperatures in the cycle. Assuming constant specific heats for air at room temperature; show the initial process and process change in a T-s diagram; calculate the change in the net work output per unit mass; and determine the change in thermal efficiency of the cycle.
A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats with temperature. (g) determine the net-work output, the thermal efficiency, and the mean effective pressure forthe cycle.

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