$W_{\text{i}\text{r}\text{r}\text{o}\text{v}\text{e}\text{n}\text{a}\text{b}\text{l}\text{e}}=39\mathrm{.}51,$COP$=3\mathrm{.}24,Q_c=-168,Q_c=128$

Draw the cycle from problem $5$ on a temperature$-$entropy diagram. Include a curve for the

phase envelope, labels for each step, and an additional cycle in which the compressor is

$70.\%$ efficient.

Concept question