Consider an engine operating on the ideal Otto cycle with a compression ratio of 9.5. At the beginning of the compression process, the air is at 100 kPa and 25°C. During the constant-volume heat-addition process, 850 kJ/kg of heat is transferred to air from a source at 1800 K and waste heat is rejected to the surroundings at 290 K. Accounting for the variation of specific heats of air with temperature, determine (a) the thermal efficiency of this cycle, (b) the exergy destruction associated with the heat-addition process, (c) the exergy destruction associated with the heat-rejection process, and (d) the second-law efficiency of this cycle.
Consider an engine operating on the ideal Otto cycle with a compression ratio of 9.5. At the beginning of the compression process, the air is at 100 kPa and 25°C. During the constant-volume heat-addition process, 850 kJ/kg of heat is transferred to air from a source at 1800 K and waste heat is rejected to the surroundings at 290 K. Accounting for the variation of specific heats of air with temperature, determine (a) the thermal efficiency of this cycle, (b) the exergy destruction associated with the heat-addition process, (c) the exergy destruction associated with the heat-rejection process, and (d) the second-law efficiency of this cycle.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Consider an engine operating on the ideal Otto cycle with a compression ratio of 9.5. At the beginning
of the compression process, the air is at 100 kPa and 25°C. During the constant-volume heat-addition
process, 850 kJ/kg of heat is transferred to air from a source at 1800K and waste heat is rejected to the
surroundings at 290 K. Accounting for the variation of specific heats of air with temperature, determine
(a) the thermal efficiency of this cycle, (b) the exergy destruction associated with the heat-addition
process, (c) the exergy destruction associated with the heat-rejection process, and (d) the second-law
efficiency of this cycle.
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