Thermo-Economic Analysis of Otto Cycle

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Presentation transcript:

Thermo-Economic Analysis of Otto Cycle P M V Subbarao Professor Mechanical Engineering Department Compact & Efficient Description forStructure of an Engine…

Simplified Thermodynamic Cycles Air-standard analysis is used to perform elementary analyses of IC engine cycles. Simplifications to the real cycle include: 1) Intake and exhaust processes not considered 2) Fixed amount of air (ideal gas) for working fluid 3) Combustion process not considered 4) Engine friction and heat losses not considered 5) Specific heats independent of temperature

Otto’s Model for Engine cycle Process 1 2 Isentropic compression Process 2  3 Constant volume heat addition Process 3  4 Isentropic expansion Process 4  1 Constant volume heat rejection Compression ratio: v2 TC v1 BC Qout Qin

First Law Analysis of Otto Cycle 12 Isentropic Compression AIR

First Law Analysis of Otto Cycle 23 Constant Volume Heat Addition AIR Qin TC

3  4 Isentropic Expansion AIR 3  4 Isentropic Expansion

4  1 Constant Volume Heat Removal Qout AIR BC

First Law Analysis of Cycle Net cycle work: Cycle thermal efficiency:

Clue to Achieve Higher Efficiency