The pressure, temperature and velocity of air flowing in a pipe are $5$ $bar$, $500$ $K$ and $50$ $m$/$s$, respectively. The specific heats of air at constant pressure and at constant volume are $1.005$ $kJ$/$kgK$ and $0.718$ $kJ$/$kgK$, respectively. Neglect potential energy. If the pressure and temperature of the surroundings are $1$ $bar$ and $300$ $K$, respectively, the available energy in $kJ$/$kg$ of the air stream is
- $170$
- $187$
- $191$
- $213$