Problem $1$: A $0\mathrm{.}5-m^3$ rigid tank contains refrigerant$-134$a initially at $200$ kPa and $40$ percent quality. Heat is

transferred now to the refrigerant from a source at $39C$ until the pressure rises to $400$ kPa $.$ Determine

$($a$)$ the entropy change of the refrigerant,

$($b$)$ the entropy change of the heat source, and

$($c$)$ the total entropy change for this process.

$($d$)$ Is this process internally reversible? Explain.

$($e$)$ Is this process externally reversible? Explain.

$($f$)$ What is the entropy generation for this process?