9-33 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 dur- ing 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. Answers: (a) 3898 kPa, 1539 K, (b) 392.4 kJ/kg. (c) 52.3 percent, (d) 495 kPa

9-33 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 dur- ing 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. Answers: (a) 3898 kPa, 1539 K, (b) 392.4 kJ/kg. (c) 52.3 percent, (d) 495 kPa

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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Concept explainers

IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.

Question

9-33 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 dur-
ing 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. Answers: (a) 3898 kPa, 1539 K, (b) 392.4 kJ/kg.
(c) 52.3 percent, (d) 495 kPa

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