The thermal efficiency of an ideal Otto cycle is given by:
where r = 8 – the compression ratio,
k = 1.4 – the adiabatic index for the ideal air.
Substitute into (1):
The power P of the cycle is given by the ratio:
where W is the work of the cycle,
is the time needed to complete the cycle once, which equals to:
From (3) we can find the work of the cycle as follow:
The thermal efficiency of a cycle is given by:
η=W/Q_in , (3)
where Qin is the heat input for the cycle.
From (3) we can find the heat input Qin to the cycle as follow:
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