A refrigeration system operates under an ideal vapor compression cycle and heat is removed from a region at $-4$C and at the compressor outlet it reports a pressure of $1$ MPa. Then the same system is made to work, but with an evaporator outlet temperature of $-8$C and a compressor outlet pressure of $1\mathrm{.}2$ MPa. Consider R$-134$a as the refrigerant fluid

Make and$/$or calculate with support and interpretation

$1.$ Diagram indicating data, flow numbering, devices and T vs S Diagram

$2.$ Mass balance and energy balance in each of the devices supporting the considerations you make.

$3.$ Heat absorbed $($Q$),$ work $($W$),$ COP under the initial operating conditions

$4.$ Heat absorbed $($Q$),$ work $($W$),$ COP under the new operating conditions