HW#$7-5(15$ pt$)$ Consider a solar$-$pond $($a large$-$scale solar thermal collector$)$ power plant that operates on a simple ideal Rankine cycle with $R-134a$ as the working fluid between $0\mathrm{.}7$ MPa and $1\mathrm{.}6$ MPa $.$ The mass flow rate of $R-134a$ is $3k\frac{g}{s}.$

$($a$)$ Case $1$: R$-134$a enters the turbine as a saturated vapor at $1\mathrm{.}6$ MPa $.$

$($b$)$ Case $2$: R$-134$a leaves the turbine as a saturated vapor at $0\mathrm{.}7$ MPa $.$

For these two cases, $($i$)$ Show the cycle on a $T-$s diagram with respect to saturation lines. Determine $($ii$)$ the thermal efficiency of the cycle and $($iii$)$ the net power output of this plant.