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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Consider an ideal Stirling cycle using air as the working fluid. Air is at 400 K and 200 kPa at the beginning of the isothermal compression process, and heat is supplied to air from a source at 1800 K in the amount of 900 kJ/kg. Determine the maximum pressure in the cycle.
Required information 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 790 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account constant specific heats at room temperature. The properties of air at room temperature are cp= 1.005 kJ/kg-K, cv = 0.718 kJ/kg-K, R = 0.287 kJ/kg-K, and k = 1.4. Determine the mean effective pressure for the cycle. The mean effective pressure for the cycle is kPa.
Please atleast answer this question. I will upvote
Instead, assume variable specific heat An ideal Otto cycle has a compression ratio of 8. Atthe beginning of the compression process, air is at 95 kPaand 278C, and 750 kJ/kg of heat is transferred to air dur-ing the constant-volume heat-addition process. Taking intoaccount the variation of specific heats with temperature,determine (a) the pressure and temperature at the end ofthe heat-addition process, (b) the net work output, (c) thethermal efficiency, and (d) the mean effective pressure forthe cycle.
Answer the question.
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 103 kPa and 27°C, and 1850 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Accounting for the variation of specific heats of air with temperature, determine (a) The maximum temperature and pressure that occur during the cycle (b) The net work output (c) The thermal efficiency
Required information 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 790 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account constant specific heats at room temperature. The properties of air at room temperature are cp= 1.005 kJ/kg-K, cy= 0.718 kJ/kg-K, R = 0.287 kJ/kg-K, and k = 1.4. Determine the net work output. (You must provide an answer before moving on to the next part.) The net work output is kJ/kg.