Solve with numerical values from table.

An ideal two stage cascade refrigeration cycle with a flash vaporizer

utilizes Propane as the working fluid. The condenser operates at a

pressure of $2\mathrm{.}0$ MPa, the flash chamber operates at a pressure of $600$

kPa and the evaporator operates at $-60C.$

a$.$ Draw and label a T$-$s diagram for this system.

b$.$ Determine the COP of the cycle.

c$.$ If this unit supplies $8\mathrm{.}0$ kW of cooling, determine the mass flow

rate of the refrigerant through the evaporator.