An air$-$conditioning system is shown in the fgure below lowhich ail flows over tubes carrying Refrigerant $134$a$.$ Air enters witha quality of $20\%$ and exits at $5$ bar. $20\%C$

Ignoring heat transfer at the outer surface of the ain conditloner, and neglecting kinetic and potential energy effects, determine at steady state:

$($a$)$ the mass flow rate of the refrigerant, in kgomin

$($b$)$ the rate of heat transfer, in kl$/$nin$,$ to the air from the refrigerant.