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 air during the constant-volume heat-addition process. Taking into account the variatio 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, ar (d) the mean effective pressure for the cycle.
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 air during the constant-volume heat-addition process. Taking into account the variatio 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, ar (d) the mean effective pressure for the cycle.
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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Transcribed Image Text: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
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