Question # $8($Optional$)$

Otto Cycle

An ideal Otto cycle has a compression ratio of $8.$ At the beginning of the compression process, air is at $95(kPa)$ and $27C,$ and $750(k\frac{J}{k}g)$ of heat is transferred to the air during the the constant volume heat addition process. Taking into account the variation of specific heats with temperature $($use A$21),$ determine:

a$)$ The pressure and temperature at the end of the heat addition process.

$($answers: $3898$ kPa, $1539$K$)$

b$)$ The net work output $($answer: $392\mathrm{.}4k\frac{J}{k}g)$

c$)$ The thermal efficiency $($answer: $52\mathrm{.}3\%)$

d$)$ The mean effective pressure for the cycle $($answer: $495$ kPa $)$ v