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Module 5 · Closed Cycles · Free practice
5.2 Practice: Otto Engine
Worked practice problem with a full solution video.
Video Lesson: Air-standard Otto cycle worked practice problem covering states, compression work and heat input in engineering thermodynamics, with notes you can draw on.
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A closed-system Otto cycle running with air (as an ideal gas) has the following given parameters: CR = 10.8, P₁ = 1.05 bar, T₁ = 25 °C, V₁ = 520 cm³, T₄ = 487 °C. Processes 1→2 and 3→4 are isentropic. Neglect P.E. and K.E.
Questions:
- Find the P, V, T of all states and sketch the p–V diagram qualitatively.
- Find the compression work W₁₂.
- Find the heat input Q₂→₃.
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