Consider the air-standard Otto cycle described in Problem 9.94, operating with a compression ratio of 8:1. In

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Consider the air-standard Otto cycle described in Problem 9.94, operating with a compression ratio of 8:1. In the constant-volume heat-addition process (state 2–state 3), 1800 kJ/kg of energy is transferred to the air. If the cycle begins with air at ambient conditions of 100 kPa and 15° C (state 1), determine the cycle efficiency. Also determine the heat rejected to the atmosphere.


Problem 9.94

1-2 : Internally reversible, adiabatic compression from the maximum volume Vmax to the minimum volume Vmin.

2-3 : Constant-volume heat addition to a peak cycle temperature T3.

3-2 : Internally reversible, adiabatic expansion from Vmin to Vmax.

4-2 : Constant-volume heat rejection to return to the initial state.

Sketch this cycle using P–V and T–S coordinates, labeling each state point (1, 2, 3, and 4).

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Thermodynamics Concepts And Applications

ISBN: 9781107179714

2nd Edition

Authors: Stephen R. Turns, Laura L. Pauley

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