Consider a steady$-$flow Carnot refrigeration cycle that use

refrigerant$-134$a as the working fluid. The maximum and minimum temperatures in the

cycle are $34$C$?$ and $20$C$,$ respectively. The cooling capacity qL is $139\mathrm{.}46$ kJ$/$kg$.$ Show the

cycle on a T$-$s diagram relative to saturation lines, and determine: $($a$)$ the coefficient of

performance, $($b$)$ the condenser and evaporator pressures, and $($c$)$ the net work input.