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Air at temperature 15 degrees Celsius and the pressure 1 bar enters and compresses to the...

Air at temperature 15 degrees Celsius and the pressure 1 bar enters and compresses to the pressure 15 bar at an isentropic state.
Soon, it is heated to 1400 degrees Celsius and ΔV = 0. Then it is allowed to expand isentropically to its initial state again.
Calculate what at the end of the expansion step and the compression step the temperature will be. Also calculate the thermal efficiency of the process. We can assume that the combustion engine work cycle is worked by a Otto process.

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