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 during the constant-volume heat-addition process. Consider the variation of specific heats with temperature. (d) Explain the relationship between thermal efficiency (?) and compression ratio (r). (e) Why are high compression ratios not used in spark ignition engines? (f) Determine the pressure and temperature at the end of the heat addition process (g) Determine the net-work output, the thermal efficiency, and the mean effective pressure for 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 during the constant-volume heat-addition process. Consider the variation of specific heats with temperature. (d) Explain the relationship between thermal efficiency (?) and compression ratio (r). (e) Why are high compression ratios not used in spark ignition engines? (f) Determine the pressure and temperature at the end of the heat addition process (g) Determine the net-work output, the thermal efficiency, and 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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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 during
the constant-volume heat-addition process. Consider the variation of specific heats with
temperature.
(d) Explain the relationship between thermal efficiency (?) and compression ratio (r).
(e) Why are high compression ratios not used in spark ignition engines?
(f) Determine the pressure and temperature at the end of the heat addition process
(g) Determine the net-work output, the thermal efficiency, and the mean effective pressure for
the cycle.
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